logo
rexresearch.com


Aragonite Patents



https://worldwide.espacenet.com/searchResults?submitted=true&locale=en_EP&DB=EPODOC&ST=advanced&TI=&AB=aragonite&PN=&AP=&PR=&PD=&PA=&IN=&CPC=&IC=
    


CN106048709
Preparation method for calcium carbonate whiskers extracted from limestone

The invention relates to specifically relates to a preparation method for calcium carbonate whiskers extracted from limestone, belonging to the field of inorganic micropowder. According to the preparation method, natural limestone is subjected to fragmentation and crushing and then mixed with a proper amount of water and a surface modifier, and the calcium carbonate whiskers with structured morphology can be directly obtained through the processes of generation, dissolving, decomposition and crystallization of calcium bicarbonate. The preparation method comprises the following key technical steps: (1) introducing high-pressure CO2 gas into limestone dust suspension with the proper amount of the surface modifier so as to convert calcium carbonate into water-soluble calcium bicarbonate; and (2) controlling decomposition of water-soluble calcium bicarbonate under proper reaction conditions so as to allow the calcium carbonate whiskers mainly of aragonite structures to be precipitated. The preparation method has low requirement on raw materials and completes both purification and crystallization in the process of preparation; and the calcium carbonate whiskers have hydrophobic surfaces, show good dispersibility in matrixes like organic solvents and high-molecular resin and are applicable to the industrialization fields of paint, plastics, polymer composites, etc.



CN105883878
Method for preparing peanut-shaped aragonite calcium carbonate

The invention relates to a method for preparing peanut-shaped aragonite calcium carbonate. The method uses a chemical precipitation method and uses regulation and control of biological amino acid, under the influence of different addition amounts of amino acid, the peanut-shaped aragonite calcium carbonate with uniform size distribution is obtained. The obtained peanut-shaped aragonite calcium carbonate has the characteristics of rough surface and relatively large specific surface area. The method has the advantages of simple process, safe operation, low cost, and good repeatability, and is suitable for large-scale production.



CN105967625
Cement hollow brick capable of generating far-infrared rays and preparation method thereof

The invention discloses a cement hollow brick capable of generating far-infrared rays and a preparation method thereof. The cement hollow brick is prepared from the following raw materials (by weight): 37-51 parts of aluminoferrite cement, 8-13 parts of aragonite, 4-9 parts of sodium metasilicate pentahydrate, 3-6 parts of magnetic wave stone, 10-15 parts of calcium silicate tailings, 6-9 parts of microcrystalline limestone, 12-16 parts of aluminum ash, 10-15 parts of sugar refinery filter mud, 5-10 parts of limestone, 7-11 parts of molybdenum slag, 9-14 parts of lead-zinc furnace slag, 4-6 parts of coke dust, 14-18 parts of desert sand, 5-8 parts of ammonium dihydrogen phosphate, 3-5 parts of hydroxy propyl distarch phosphate, 7-11 parts of waste bone china powder, 4-8 parts of carnallite, 2-4 parts of potassium fluoborate, 8-12 parts of BF molten slag and a proper amount of water. By cooperation of magnetic wave stone and microcrystalline limestone, strong far-infrared rays can be generated, and health of human body can be effectively adjusted. Then, the brick has a medical care effect.



KR101656035
A METHOD FOR THE SYNTHESIS OF PRECIPITATED CALCIUM CARBONATE FROM DOLOMITE KILN DUST

The present invention relates to a method for preparing aragonite type precipitated calcium carbonate through a carbonation process using MgCl_2 and CO_2 gas alone by using dolomite firing furnace dust. The present invention provides a method for preparing precipitated calcium carbonate using dolomite firing furnace dust, which comprises the steps of: firing dolomite dust in a vertical type firing furnace; hydrating the fired dolomite dust; classifying the hydrated dolomite dust, followed by solid-liquid separation and drying; adding the dried dolomite dust to a MgCl_2 solution; and introducing CO_2 gas to the MgCl_2 solution to which the dolomite dust is added to carry out carbonization.



WO2016137597
A CONTROLLED PROCESS FOR PRECIPITATING POLYMORPHS OF CALCIUM CARBONATE

A process for converting gypsum into precipitated calcium carbonate including reacting a mixture comprising gypsum and a seed, a mineral acid, or both with at least one carbonate source, whereby precipitated calcium carbonate is produced in the form of calcite and/or aragonite directly without conversion from a vaterite polymorph. Also, a process for converting gypsum into precipitated calcium carbonate including providing a mixture comprising i) gypsum ii) a seed, a mineral acid, or both iii) at least one additive selected from the group consisting of ammonium sulfate, an organic acid, or an iron material, and reacting the mixture with at least one carbonate source to produce precipitated calcium carbonate in the form of vaterite. The precipitated calcium carbonates having desired and unique composition, polymorph and crystal size characteristics formed by these processes.



WO2016134478
STRUCTURES AND METHODS OF MANUFACTURING STRUCTURES USING BIOLOGICAL BASED MATERIALS

A structure for a turbine, the structure comprising a body having a multi-layer construction including an interior layer with substantially uniform concentrations throughout of facultative anaerobic organisms (FAO) that have gene sets capable of producing the enzyme urease and/or the proteins purloin, lustre A and perlustrin, along with glucose, and non-uniform concentrations throughout of a structural composition, the structural composition including a chitin-based component with silk fibronectin and water; an exterior layer of urea, water, calcium ions and facultative anaerobic organisms (FAOs) including urease, aragonite; and a binding layer of conchiolin protein intermediate the interior layer and the exterior layer. The facultative anaeorobic organisms (FAOs) are organisms classified in one of the Saccharomyces, Escherichia and Bacillus genuses.



CN105908259
Preparation method of calcium carbonate whiskers with concave and convex surface morphology

The invention discloses a preparation method of calcium carbonate whiskers with concave and convex surface morphology. The method is characterized in that organic calcium is used as a calcium source, organic magnesium is a crystal regulating agent, and chitosan is used as a template agent; the mole ratio of calcium ions in the organic calcium to magnesium ions in the organic magnesium is regulated and controlled; meanwhile, carbon dioxide atmosphere is provided through natural decomposition of ammonium carbonate under the sealing condition, so that aragonite type calcium carbonate whiskers (the length diameter ratio is 2 to 20) with regular morphology, the length being 1 to 3mum and the radial length being 0.15 to 0.6mum are obtained. The method has the advantages that the organic calcium and the organic magnesium are used as raw materials; the C1- introduced by common inorganic salts (CaCl2 and MgCl2) is avoided; the purity of the calcium carbonate whisker product is effectively ensured. The surface of the calcium carbonate whiskers prepared by the method is in a granular accumulation morphology; the large specific surface area and the special concave and convex microtopography are realized; the bonding capability with organic matters can be enhanced; other substances are loaded, so that the calcium carbonate whiskers can be used as high-performance polymer composite material fillers and other substance loading substrates.
    

   
CN105819483
Precipitated calcium carbonate seed crystal containing aragonite crystalline phase and preparation method thereof

The invention provides precipitated calcium carbonate seed crystal containing an aragonite crystalline phase and a preparation method thereof. The precipitated calcium carbonate seed crystal containing the aragonite crystalline phase is characterized in that weight content of an aragonite phase is greater than 80%, and the particle size of the seed crystal D50 is greater than or equal to 0.1 [mu]m and less than or equal to 0.2 [mu]m. The precipitated calcium carbonate seed crystal can be used for preparing the precipitated calcium carbonate containing a metastable crystalline phase, and also can be directly used in the corresponding industrial field. The method has the advantages of low cost and obvious process advantage, and the technology bias that strontium salts such as strontium chloride cannot be used to prepare the precipitated calcium carbonate seed crystal containing the aragonite crystalline phase in the prior art is overcome. The provided technology has wide application prospect based on the above advantages.
   

   
CN105660485
Novel coral growing matrix with aragonite enrichment function and preparation method and application thereof

The invention discloses a novel coral growing matrix with an aragonite enrichment function and a preparation method and application thereof.According to the preparation method, a seawater electrolysis device is included and comprises a power supply, an anode chamber, a cathode chamber, an anode and a cathode, the power supply is connected with the anode and the cathode through wires, the anode is arranged in the anode chamber, the cathode is arranged in the cathode chamber, an iron stand is taken as the cathode, an inert material is taken as the anode, seawater is taken as an electrolytic substrate to be filled in the anode chamber and the cathode chamber separately, and then electrolysis is performed; calcium carbonate crystals are deposited on the iron stand serving as the cathode, and when calcium carbonate is formed on the surface of the cathode iron stand, the novel coral growing matrix with the aragonite enrichment function is obtained.The surface of the iron stand is not prone to rust, the structure of a produced calcium carbonate crystal layer is similar to that of coral skeleton crystals, therefore, an ideal attaching matrix can be supplied to marine reef-building organisms, attaching sites are especially supplied to larvae of corals, and the possibility is supplied to acceleration of coral calcification and reef forming.



US2016175480
Solid Forms for Tissue Repair

This invention provides aragonite- and calcite-based scaffolds for the repair, regeneration, enhancement of formation or a combination thereof of cartilage and/or bone, which scaffolds comprise at least two phases, wherein each phase differs in terms of its chemical content, or structure, kits comprising the same, processes for producing solid aragonite or calcite scaffolds and methods of use thereof.



RU2014140602
MINERAL COMPOSITION BASED ON CALCIUM AND MAGNESIUM CARBONATES MIXED SOLID PHASE, PREPARATION METHOD AND USE THEREOF

FIELD: physics.SUBSTANCE: invention relates to mineral composition based on calcium and magnesium carbonates mixed solid phase, to method of its production and application. Mineral composition based on calcium and magnesium carbonates mixed solid phase, consisting of crystalline calcium and magnesium fractions, crystallized in form of plates, wherein crystals of calcium and magnesium fractions are combined in form of combined units, wherein said units themselves are at least partially agglomerated, and said calcium fraction contains at least one carbonate, selected from group consisting of calcite, aragonite and mixtures thereof, and said magnesium fraction contains hydromagnesite in plate-like form, wherein said mixed solid phase has bulk density, measured according to norm EN 459.2, less than or equal to 250 kg/mand more or equal to 80 kg/m.EFFECT: technical result consists in reduction of bulk density and heat conductivity.



WO2016178226
OPTIMIZED SOLID SUBSTRATES, TOOLS FOR USE WITH SAME AND USES THEREOF FOR PROMOTING CELL AND TISSUE GROWTH

This invention provides optimized solid substrates for promoting cell or tissue growth or restored function, which solid substrate comprises aragonite and is characterized by a specific fluid uptake capacity value of at least 75%, or a contact angle value of less than 60 degrees when in contact with a fluid and which is further characterized by tapered sides and tools for implantation of optimized solid substrates.



CN105568330
Preparing method of super-amphiphobic surface with scale preventing performance

The invention discloses a preparing method of a super-amphiphobic surface with scale preventing performance, relates to a preparing technology of the super-amphiphobic surface, and belongs to the field of metal material surface modification. The preparing method is a method for preparing a super-amphiphobic copper-zinc alloy layer on the surface of rolled steel. According to the preparing method, rolled steel serves as a substrate, firstly, a copper-zinc alloy layer is electrically deposited on the surface of the rolled steel, then a sample with the surface covered with the copper-zinc alloy layer is immersed in a beaker containing a mixed solution of potassium hydroxide and ammonium persulfate, and the beaker is placed in a water bath at a certain temperature to be insulated for corresponding time; and then at the room temperature, the treated steel sample is immersed in a perfluoro caprylic acid absolute ethyl alcohol solution with a certain concentration for several hours, and then the treated steel sample is taken out to be aired at the room temperature so that the super-amphiphobic surface can be obtained. The contact angle between the super-amphiphobic surface obtained through the method and water and the contact angle between the super-amphiphobic surface obtained through the method and glycerin both exceed 150 degrees, and the rolling angle between the super-amphiphobic surface obtained through the method and water and the rolling angle between the super-amphiphobic surface obtained through the method and glycerin are both smaller than 5 degrees. The scaling appearance of the super-amphiphobic sample in a mixed solution composed of CaCl2 and NaHCO3 is in a needle shape and is similar to an aragonite structure, and the super-amphiphobic sample has good scale preventing performance compared with a rhomb calcite structure on the surface of a steel base body.



CN105565355
Aragonite type light calcium carbonate used for paper coating and synthetic method thereof

The invention provides a synthetic method for aragonite type light calcium carbonate used for a paper coating. The synthetic method comprises the following steps: calcining limestone so as to produce calcium oxide; putting calcium oxide into a digestion tank for nitrification so as to produce calcium hydrate; and applying a magnesium salt and/or gypsum whisker accounting for 0.01 to 0.5% of the weight of quicklime as seed crystal during carbonization of calcium hydrate so as to obtain aragonite type light calcium carbonate slurry and collecting the product so as to obtain the aragonite type light calcium carbonate. The invention also provides the aragonite type light calcium carbonate synthesized by using the synthetic method and used for the paper coating. As the aragonite type light calcium carbonate synthesized by using the synthetic method is applied to coated paper, printing surface strength of the paper can be improved by 5 to 30%, and paper glossiness and printing glossiness can be improved by 2 to 10%; thus, product quality is improved, and production cost of papermaking enterprises is reduced.



CN105543975
Method for synthesizing calcium carbonate nanocrystal whiskers on basis of sodium carboxymethyl cellulose and potassium chloride

The invention relates to a method for synthesizing calcium carbonate nanocrystal whiskers on the basis of sodium carboxymethyl cellulose and potassium chloride. According to the synthesis method, a refined Ca(OH)2 slurry is used as the raw material, a mixture of sodium carboxymethyl cellulose and potassium chloride in different proportions is used as a binary composite crystal form control agent, and a CO2-assisted carbonation process is utilized to synthesize the calcium carbonate nanocrystal whiskers. The method is characterized in that the binary composite crystal form control agent composed of sodium carboxymethyl cellulose and potassium chloride is utilized to effectively control the synthesis of the calcium carbonate nanocrystal whiskers; and the filtrate containing the sodium carboxymethyl cellulose and potassium chloride is recovered and recycled. The method is simple and easy to operate, and is suitable for industrial production of the calcium carbonate nanocrystal whiskers. The synthesized calcium carbonate nanocrystal whiskers are of an aragonite type, and have the characteristics of high purity, high length-diameter ratio and the like.



CN105484099
Aragonite-type light calcium composition used in paper coating, and application method thereof

The invention provides an aragonite-type light calcium composition used in paper coatings. The composition comprises the components of 10-50% of aragonite-type light calcium, 50-90% of heavy calcium carbonate, 5-20% of styrene-butadiene latex, and 2-5% of a dispersing agent, a lubricant and a water repellent. The invention also provides a paper modification method comprising the following steps: Step 1, the aragonite-type light calcium composition used in paper coating, described in Claim 1, is provided; and Step 2, the composition is used in coating paper. With the paper-coating aragonite-type light calcium composition provided by the invention, paper printing surface strength can be improved by 5-30%, and paper gloss and printing gloss can be improved by 2-10%. Therefore, the quality of finished products is improved, and papermaking enterprise production costs can be reduced.



WO2016103165
A METHOD FOR TREATING WATER FOR USE ON A WATERCRAFT, AND APPARATUS THEREFOR

A method for treating an amount of a raw liquid (1) for use on a watercraft, typically fresh or salt water, containing a solute adapted to form an encrusting deposit such as Calcium carbonate in the form of Calcite, comprises prearranging a treatment duct (10) with a flow section (11) that has a predetermined transversal dimension (D), along a transversal direction of the treatment duct; conveying the raw liquid into the treatment duct, thus forming there a liquid under treatment (2) that flows at a predetermined speed (v); forming in the treatment duct an alternating electric field (E) having an intensity alternating between maximum and minimum values, at a predetermined frequency, and having substantially the same field direction as the transversal direction of the treatment duct, wherein the transversal dimension and/or the speed are selected so that the liquid under treatment has a residence time longer than 0.1 seconds within the treatment duct, wherein the frequency is set between 5 and 15 kHz, wherein at least the maximum intensity value is set between 1 and 5 kV per centimetre of the transversal dimension of the treatment duct. This way, the raw liquid is transformed so as to interact with said solute to form a non-encrusting solid, for example CaCO3 in the form of Aragonite, so containing or eliminating problematic encrusting deposits, which would lower the efficiency and shorten the useful life of such ship's equipment as sanitary water users and heat exchangers treating seawater, and would increase related maintenance costs.



US2015359931
Calcium-Mediated Effects of Coral and Methods of Use Thereof

This invention is directed to coral scaffolds seeded with precursor cells in culture in the presence of a chelator and uses thereof in inducing or enhancing bone and/or cartilage formation in a subject, and kits related thereto. This invention is also directed to use of cadherin-upregulating coral for treating cancer or inhibiting cancer progression. This invention is also directed to use of aragonite or calcite-producing species for in vivo calcium release, and its application to the treatment of skin diseases, disorders or conditions.



CN105152198
Preparation method of flaky aragonite type superfine calcium carbonate particles

The invention discloses a preparation method of flaky aragonite type superfine calcium carbonate particles. The preparation method of flaky aragonite type superfine calcium carbonate particles comprises the following steps: dissolving 60 parts by weight of calcium oxide in water, carrying out conventional hydration reaction, adding an auxiliary inducer and filtering to obtain a 3-10wt% Ca(OH)2 suspension solution, subsequently adding a flaky crystal two-dimensional excipient, introducing CO2 into a carbonation reaction kettle at the temperature of 50-95 DEG C to carry out carbonation reaction, stopping introducing CO2 till the pH is 7-7.5, continuing to carry out carbonation reaction for 20 minutes, then conventionally filtering, washing and drying via hot air to obtain the flaky aragonite type superfine calcium carbonate particle products. Through the preparation method of flaky aragonite type superfine calcium carbonate particles, flaky calcium carbonate products are obtained by adding the inducer and the flaky crystal two-dimensional excipient; the products are excellent in directional arrangement, low in possibility of agglomeration and high in capability of reflecting light; the application effect of calcium carbonate is improved; the preparation method of flaky aragonite type superfine calcium carbonate particles is simple in reaction condition, liable to operate, low in production cost and high in economic, social and ecological benefits.
    


CN104790024
Preparation method for aragonite calcium carbonate whisker with high length-diameter ratio

The invention relates to a preparation method for an aragonite calcium carbonate whisker with a high length-diameter ratio. The preparation method comprises the following specific implementation steps: adding a 1.0-8.2 wt% prepared Ca(OH)2 suspension liquid into a carbonation reactor, adding MgCl2 in the aqueous solution form into the reactor, controlling the magnesium-calcium ratio R to be 0.6-2.0 and the carbonization temperature to be 30-85 DEG C, under the action of stirring, mixing CO2 with the flow rate of (5-120)m<3>/(h.m<3> suspension liquid)and N2, introducing the mixture of the CO2 and N2 to a gas distributor at the bottom of the carbonation reactor, and tracking the whole process of carbonation reactor by adopting a digital display pH meter; performing suction filtration and washing on the slurry generated after the carbonization is completed, drying for 5 hours at the temperature of 80 DEG C, and crushing, so as to obtain a calcium carbonate whisker sample. Compared with the existing method for preparing the aragonite calcium carbonate whisker through a carbonation method, the preparation method provided by the invention has the advantages that the calcium carbonate whisker with the high length-diameter ratio is synthesized by adopting the one-step method, the multistage growth is avoided, and the operation is simpler; the co-heating reaction balance phase of magnesium chloride and calcium hydroxide is avoided, the magnesium-calcium ratio in the reaction slurry is low, and the synthesis efficiency is higher.



US2015159365
HIGH PERFORMANCE THERMAL INSULATION PRODUCTS

The manufacture of a thermal insulating product whereby a foam is produced from a mixture of mineral particles, the product is shaped, and the foam is dried. Specifically, the foam is produced from a crystallized calcic part and a crystallized magnesian part, and a composite aggregate of the crystals of the calcic and magnesian part is formed. The calcic part is chosen from calcite and/or aragonite, and the magnesian part is made of hydromagnesite.



US2015147397
Biomatrix Hydrogels and Methods of Use Thereof

This invention is directed to aragonite and calcite hydrogel biomatrices, optionally seeded with precursor cells and uses thereof in tissue engineering, regeneration and repair, including in inducing or enhancing bone formation, cartilage formation or a combination thereof in a subject, and kits related thereto.



US2015134065
Mulit-Phasic Solid Implants for Tissue Repair

This invention provides aragonite- and calcite-based solid substrates for the repair, regeneration, enhancement of formation or a combination thereof of cartilage and/or bone, which solid substrates comprise or are made to ultimately comprise three phases, wherein each phase differs in terms of its chemical content, or structure, kits comprising the same, and methods of use thereof.



EP2939985
ANTI-SCALE WATER TREATMENT MEDIUM

This invention relates to a transforming media in the form of a transforming granular composition, comprising:a combination of about 5-97% by weight of a transforming agent that directs the crystallization of calcium carbonate into aragonite form in flowing water, the transforming agent having a solubility in water of about 0.1 to about 50 mg/L; and about 3-95% by weight of a binding agent; and optionally an additive; wherein the composition has a calculated bulk density (grams transforming agent/cc transforming granule) of at least 6% that of the bulk density of the transforming agent; and wherein at least 50% of transforming agent particles in the transforming granules have an average particle size of about 1 micrometer to about 5000 micrometer.



CN104495900
Method for preparing nanometer calcium carbonate powder by mechanochemical method of shells

The invention discloses a method for preparing nanometer calcium carbonate powder by mechanochemical method of shells and belongs to the field of inorganic materials. The method comprises the following steps: (1) cleaning the shells, carrying out ball milling and sieving to obtain shell powder; (2) adding the shell powder into an aqueous solution of an alkaline oxidant and carrying out wet ball milling for 10-40 hours at room temperature by adopting zirconium oxide beads as a ball-milling medium; and (3) separating, cleaning and drying the ball-milled shell powder to obtain calcium carbonate powder having an aragonite/calcite structure, wherein the morphology of the powder particle is regular and the particle size is uniform and the grain size is 20-100 nm. The method has the characteristics of low cost of raw materials, simplicity in preparation process, energy conservation and environment friendliness and the like, is suitable for industrial-scale production of nanometer calcium carbonate powder and can be widely used in such fields as plastics, paint, paper making, ink and medicines.



CN104386728
Method for preparing homogenous-phase nanometer aragonite-type calcium carbonate by acid hydrolysis of limestone

The invention discloses a method for preparing homogenous-phase nanometer aragonite-type calcium carbonate by acid hydrolysis of limestone. The method comprises the following steps of firstly grinding limestone into limestone powder; dissolving limestone powder with hydrochloric acid into a solution taking CaCl2, MgCl2, FeCl3 and FeCl2 as main components; adding NaClO so that Fe<2+> is oxidized to Fe<3+>; adding ammonia water to adjust the pH value of the solution such that Fe<3+> in the solution is removed in a form of Fe(OH)3; further adding ammonia water to adjust the pH value of the solution to 10.5-11 and carrying out suction-filtration to remove magnesium; and finally introducing CO2 and reacting at 50-70 DEG C to form CaCO3 precipitate, filtering, washing and drying to obtain high-purity homogeneous-phase nanometer aragonite-type calcium carbonate. Compared to methods in the prior art, by the method disclosed by the invention, under the premise of no need of any crystal-form control agent and any high-energy-consumption process, nanometer aragonite-type calcium carbonate having a metastable crystal form can be obtained and the content is uniform. The acid hydrolysis process has the advantages of more environmental friendliness, low energy consumption, high resource utilization rate and simple method.
 


MX2013004138
DEVICE AND METHOD FOR DEPURATING WATER AND CHANGING THE CRYSTALLINE STRUCTURE OF THE CALCIUM CARBONATES FROM CALCITE TO ARAGONITE.

The invention refers to a device and method for precipitating solids suspended in a volume of fresh and/or residual water. The device and method cause a circular and centrifuge movement in the liquid. This circular movement of the liquid originates a centripetal movement in the particles suspended within the liquid, thus creating deposits which are precipitated upon reducing the speed inside the liquid volume. The device and method originate dissolution of the carbonates present in the liquid volume and transform the calcium and magnesium carbonates found in a crystalline manner known as calcite, into the crystalline form known as aragonite.



CN104310451
Preparation method of aragonite type white mud calcium carbonate

The invention belongs to the recovery utilization of solid waste-alkali recovery white mud in paper-making industry and in particular relates to a preparation method of aragonite type white mud calcium carbonate. The existing method for preparing white mud calcium carbonate with certain crystal form has the prominent problems that the preparation process control requirement is high and the alkali recovery efficiency is seriously influenced. Quicklime or hydrated lime and a part of purified green liquid are reacted at 60-100 DEG C to form a crystal nucleus solution, and then the crystal nucleus solution is reacted with the remained purified green liquid at 60-100 DEG C for 30-120min, the temperature is preserved for 30min, then filtering and washing are carried out to obtain the aragonite type white mud calcium carbonate. The filling performance of the prepared white mud calcium carbonate can be improved, and no obvious influence on the existing production process control and the alkali recovery efficiency is caused.



KR101453923
MANUFACTURING OF CALCIUM CARBONATE FILMS HAVING ARAGONITE STRUCTURE BY ELECTROCHEMICAL PROCESS

The present invention relates to a method of manufacturing a calcium carbonate layer, and more particularly, to a method of manufacturing a large capacity and large area calcium carbonate layer having a uniform crystalline structure by manufacturing a large area layer through an eco-friendly electrochemical process instead of a typical chemical synthesizing method while easily controlling a ratio of a calcite and an aragonite crystalline structure of a calcium carbonate layer through adding a magnesium chloride. In the present invention, the large area calcium carbonate layer having a uniform crystalline structure is manufactured through the eco-friendly electrochemical process using an aqueous solution of CaCl_2, NaHCO_3, and MgCl_2, and the large area layer having the uniform calcium carbonate crystalline structure, which is manufactured through the electrochemical process by controlling a concentration of MgCl_2, is verified.



CN104118896
Method for preparing high purity aragonite type nano calcium carbonate by acidolysis of limestones

The invention discloses a method for preparing high purity aragonite type nano calcium carbonate by acidolysis of limestones and belongs to the technical field of preparation of nanomaterials. The method comprises the following steps: by using an abundant mineral resource limestones in nature as raw materials, directly acid leaching without adding any additive; and carrying out a replacement reaction on the acid-leached CaCl2-NH4Cl filtrate and a sodium carbonate solution to obtain the high purity aragonite type nano calcium carbonate. The method disclosed by the invention avoids high temperature sintering, can save the energy consumption, reduce dust pollution generated by combustion of coal and solve the problem that the utilization ratio of the mineral resource is low, and can realize clean and environment-friendly production.; The method disclosed by the invention is simple to operate and low in cost and the prepared aragonite type nano calcium carbonate is high in yield and purity and easy to realize industrialized production.
   

    
JP2014169919
DECONTAMINANT AND DECONTAMINATION METHOD

PROBLEM TO BE SOLVED: To provide a decontaminant capable of easily absorbing a radiation emitted from a radioactive substance, absorbing a gamma ray by aragonite exciting processing and improving a decontamination effect.SOLUTION: The decontaminant used for decontaminating a contaminant, such as incinerated ash, contaminated with a radioactive substance is obtained by: quarrying aragonite from a quarry; pulverizing the aragonite into fine particles having an average particle size of 10 mm or less; heating the fine particles of the pulverized aragonite in a range of temperature of 250-450°C to perform exciting processing of the fine aragonite particles; forming the fine aragonite particles into a porous structure having minute pores by the exciting processing of the fine aragonite particles; and using the fine aragonite particles formed into the porous structure having minute pores.



CN104069792
Synthetic method of aragonite material for deeply removing phosphorus wastewater
 
The invention discloses a method for synthesizing an aragonite type nano adsorbing material. The synthetic method specifically comprises the following steps: (1) adding a 0.9 mol/L calcium acetate (Ca(CH3COO)2) water solution into glycol to prepare a solution A; (2) adding a 3 mol/L Na2CO3 water solution into glycol to prepare a solution B; and (3) quickly mixing the solution A with the solution B for reaction in a water bath at 50 DEG C, thereby obtaining a product after one hour, repeatedly washing the product with absolute ethyl alcohol (AR), taking out and drying at 40 to 60 DEG C. The synthetic material designed in the invention is a nano aragonite (Ca(CO)3) material which can be used for effectively and deeply removing high-concentration phosphorus pollutants from wastewater (for total phosphorus with the concentration of 500 mg/L, the removing rate reaches more than 90%), secondary treatment does not need to be performed on a treatment product, and the product can be used as a phosphatic fertilizer to be directly applied to farmland. A foundation is established for industrial wastewater treatment and resource reuse, and good economic and social benefits are achieved.



CN104027840
Preparation method of porous scaffold for bone repair
 
The invention relates to a preparation method of a porous scaffold for bone repair, belonging to the technical field of bio-medical materials. The preparation method comprises the steps of firstly dissolving poly-L-lactic acid into a solvent to obtain a first solution; dissolving polycaprolactone into the solvent to obtain a second solution; mixing the first solution and the second solution to obtain a third solution; adding nano hydroxyapatite particles into the third solution to obtain a fourth solution; adding aragonite or vaterite pearl powder particles into the fourth solution to obtain a fifth solution; pouring the fifth solution into a scaffold mold, freezing, and then performing freeze drying to obtain a dried bone repair porous composite scaffold. The porous scaffold prepared by using the method disclosed by the invention has good mechanical performances; inorganic components of the scaffold are more close to the bone so as to ensure that a bone repair material has better bio-compatibility, is beneficial for the growth and proliferation of cells, and can be used for prolonging the degradation time of the bone repair scaffold.
 


RU2012146546
METHOD OF OBTAINING PRECIPITATED CALCIUM CARBONATE

FIELD: chemistry.SUBSTANCE: invention can be used in the chemical industry. A method of obtaining a precipitated calcium carbonate product includes the following stages:  formation of a water suspension of precipitated calcium carbonate grains by carbonisation of Ca(OH)suspension in the presence of 0.005-0.03 mol Sr in the form of Sr(OH)per mol of Ca(OH)and (b) formation of the water suspension of the precipitated calcium carbonate product by carbonisation of Ca(OH)slurry in the presence of 0.5-5% of dry weight of the precipitated calcium carbonate grains. The precipitated calcium carbonate grains have D50, which is lower than D50 of the precipitated calcium carbonate product. The precipitated calcium carbonate grains also have a content of aragonite polymorph higher or equal to its content in the precipitated product - calcium carbonate.EFFECT: invention makes it possible to increase the content of aragonite polymorph in the precipitated calcium carbonate.



MY149014
METHOD OF PRODUCING CALCIUM CARBONATE NANOPARTICLES

THE INVENTION PROVIDES A METHOD OF PRODUCING CALCIUM CARBONATE NANOPARTICLES FROM ANADARA SP. WHEREIN THE METHOD INCLUDES THE STEPS OF:  MIXING DEIONIZED WATER WITH THE ANADARA SP. TO OBTAIN A MIXTURE; (B) ADDING DODECYL DIMETHYL BETAINE TO THE MIXTURE; (C) STIRRING THE MIXTURE FROM STEP (B); (D) FILTERING THE STIRRED MIXTURE USING A FILTER MEANS TO OBTAIN THE CALCIUM CARBONATE NANOPARTICLES; AND (E) REMOVING MOISTURE FROM THE FILTERED CALCIUM CARBONATE NANOPARTICLES. THE METHOD PRODUCES CALCIUM CARBONATE NANOPARTICLES WHICH HAS AN AVERAGE DIAMETER OF 20 NM TO 30 NM AND IS OF ARAGONITE FORM.



CN103570052
Method for preparing single-crystal-form ball aragonite nano calcium carbonate through microemulsion system    

The invention discloses a method for preparing single-crystal-form ball aragonite nano calcium carbonate through a microemulsion system, and belongs to the technical field of nanometer materials. According to the method, a non-aqueous xylene/emulsifier/co-emulsifier microemulsion system is firstly prepared, then a calcium chloride microemulsion is prepared in a microemulsion area, then a sodium carbonate aqueous solution at certain concentration is slowly added into the calcium chloride microemulsion and reacts to finally obtain a ball aragonite nano calcium carbonate emulsion; or demulsification, precipitation, washing and drying are conducted to obtain the ball aragonite nano calcium carbonate powder.; The ball aragonite nano calcium carbonate prepared according to the method provided by the invention has the characteristics such as small particle size, single crystal form, and good stability of crystal form. The reaction condition is mild, the equipment is simple and easy to operate, meanwhile, the chosen materials are low in cost and are easy to get, so that the method is easy in promotion and application.



FR2998306
Improving e.g. wine by alcoholic fermentation, comprises introducing ball of aragonite-type natural pearl into wine...

The method comprises introducing a ball of aragonite-type natural pearl or cultured pearl into wine, after common deacidification of wine and before closing the bottle, progressively lead to a decline in acidity of the wine in the bottle once the bottle is closed. An independent claim is included for wine bottle.



CN202562331
Evaporation type heat exchange device

The utility model relates to an evaporation type heat exchange device... The electromagnetic anti-scaling device activates water molecules enabling the cations and the anions to form soft aragonite crystals, so that the crystals can not deposit and scale on the wall of the heat exchange pipe..



US2012234753
COOLING SYSTEM AND METHOD FOR THE OPERATION THEREOF

The invention relates to a cooling method and cooling system comprising a cooling device (1) -- a water treatment device (9) is arranged, which has the property of adding zinc to the cooling water, in particular in order to convert calcite occurring in the cooling water into aragonite and/or vaterite and/or other crystallization forms.



CN102583482
Preparation method of flake-shaped aragonite calcium carbonate

The invention discloses a preparation method of flake-shaped aragonite calcium carbonate. The preparation method comprises the following steps: (1) performing dry method coarse grinding to a shell raw material, soaking the shell raw material in lotion for 4-48h at normal temperature, utilizing roller watering to remove a cuticle layer and a prismatic layer, and obtaining nacreous layer calcium carbonate by washing; (2) adding water to the nacreous layer calcium carbonate, performing high-speed agitation to prepare slurry with the concentration to be 30-80wt%, adding a grinding aid with the weight being 0.5-5% that of the nacreous layer calcium carbonate, and using a stripping machine to perform wet grinding for 60-180min with zirconia ball, alumina balls or ceramic balls serving as grinding mediums; and (3) performing filter pressing and drying grinding to obtain the flake-shaped aragonite calcium carbonate.; The preparation method of the flake-shaped aragonite calcium carbonate is simple in process and does not use a poisonous harmful reagent, the operation conditions are mild, the surface activity of the prepared flake-shaped aragonite calcium carbonate is good, and the flake-shaped aragonite calcium carbonate can be widely applied to industries such as plastics, papermaking, rubber, ink, coating, building materials, medicines and food.



CN102424415
Preparation method for needle cluster-like micrometer-scale calcium carbonate

The invention relates to a preparation method for needle cluster-like micrometer-scale calcium carbonate. According to the method, tween-80 is dissolved in toluene to obtain a mixed solution; the mixed solution is added to a Na2CO3 solution, and an ultrasonic emulsification treatment is performed to obtain an emulsified liquid; the emulsified liquid is poured in a CaCl2 solution under the stirring condition, and a reaction is performed to obtain an ivory white liquid; the ivory white liquid is subjected to treatments of standing, precipitating, separating and filtering, and the resulting precipitation is repeatedly leached by distilled water; then the resulting material is washed by dehydrated alcohol, and placed in an oven to carry out drying to obtain the needle cluster-like micrometer-scale calcium carbonate powder. The method of the present invention has the following significant characteristics: the product is synthesized by the one-step precipitation reaction method, the processis simple, and the experimental conditions are easy to obtain; the toluene and the surfactant tween-80 are adopted as the crystal form controlling agents, the calcium chloride (CaCl2) and the sodium carbonate (Na2CO3) are adopted as the raw materials, such that the sodium carbonate crystal grows along the specific direction, the needle cluster-like calcium carbonate with the length of about 10 mum is formed, the calcium carbonate particles have characteristics of good dispersity and uniform size, and are the mixed crystals of calcite and aragonite.



JP2012036116
METHOD OF EXTRACTING WATER-SOLUBLE PROTEIN ORIGINATED FROM SHELL OR PEARL

PROBLEM TO BE SOLVED: To provide a method of extracting an easily hydrolyzed water-soluble protein from raw material originated from shell or pearl by process treatment which is simple and has a low environmental load. ;SOLUTION: The raw material originated from shell or pearl is mechanochemically ground such that the factor of decrease based on diffraction intensity before grinding at a predetermined Miller index of aragonite crystal obtained by the X-ray diffraction method becomes a prescribed value. The water-soluble protein is extracted from the raw material originated from the ground shell or pearl by using water. The prescribed value is determined from a view point of extracting the water-soluble protein of a prescribed proportion according to an approximate expression representing a correlation between the factor of decrease of the diffraction intensity and the proportion of the amount of the water-soluble protein extracted from the raw material originated from the shell or pearl of the prescribed mass. ;COPYRIGHT: (C)2012,JPO&INPIT;PROBLEM TO BE SOLVED: To provide a method of extracting an easily hydrolyzed water-soluble protein from raw material originated from shell or pearl by process treatment which is simple and has a low environmental load.SOLUTION: The raw material originated from shell or pearl is mechanochemically ground such that the factor of decrease based on diffraction intensity before grinding at a predetermined Miller index of aragonite crystal obtained by the X-ray diffraction method becomes a prescribed value. The water-soluble protein is extracted from the raw material originated from the ground shell or pearl by using water. The prescribed value is determined from a view point of extracting the water-soluble protein of a prescribed proportion according to an approximate expression representing a correlation between the factor of decrease of the diffraction intensity and the proportion of the amount of the water-soluble protein extracted from the raw material originated from the shell or pearl of the prescribed mass.



CN102205984
Method for synthesizing aragonite nanorod under conditions of normal pressure and temperature

The invention discloses a method for synthesizing an aragonite nanorod under conditions of normal pressure and temperature. In the method, a solen protein layer is taken as a substrate, and an aragonite nanorod product is obtained by reacting a calcium chloride solution with carbon dioxide for 3-12 hours under the conditions of normal pressure and temperature by using a carbon dioxide diffusion deposition method. By taking the solen protein layer as the substrate for reaction under the conditions of normal pressure and temperature, the method has the characteristics of low reaction temperature, less consumed energy, high purity (above 99 percent) of a product, simple synthesis process, readily available raw materials, no pollution and the like. The aragonite nanorod is an ideal organic-inorganic composite nanomaterial.; The aragonite nanorod can be used as a reinforcing material for reinforcing the toughness of an organism and improving the plasticity of the organism, and also can be used as a biological active material which is specifically applied to the fields such as the medicine field and the like.
    


KR20110041199
METHOD FOR MANUFACTURING SUBSIDENCE CALCIUM CARBONATE OF ARAGONITE TYPE AND SUBSIDENCE CALCIUM CARBONATE MANUFACTURED WITH THIS

PURPOSE: A method for preparing aragonite type precipitated calcium carbonate and the precipitated calcium carbonate manufactured thereby are provided to secure the uniform particle size and the seed crystal of aragonite by carbonating calcium hydroxide suspension at room temperature. CONSTITUTION: The mixture of 0.4mol of Ca(OH)_2 aqueous solution, 0.2 to 1 mol of MgCl_2·6H_2O aqueous solution, and 0.01 to 0.07mol of SrCO_3 seed is prepared. Carbon dioxide gas is introduced into the mixture in order to induce a carbonating reaction. Calcium carbonate is precipitated. The precipitated calcium carbonate is cleaned and filtered. The cleaned and filtered calcium carbonate is dried.



FR2968169
Biological response modifying nutritional supplement, comprises marine aragonite microgranules coated with a freeze-dried

Biological response modifying nutritional supplement, comprises marine aragonite microgranules coated with a freeze-dried jelly of Lycium barbarumor Lycium chinenseberry . ACTIVITY : Anabolic. MECHANISM OF ACTION : None given.



JP2011073999
BONE DENSITY INCREASING AGENT

PROBLEM TO BE SOLVED: To provide a medicine exhibiting excellent bone density increasing effects on osteoporosis patients and potential osteoporosis patients, which is a preparation highly safe and effective for the prevention and treatment of osteoporosis. SOLUTION: The bone density increasing agent for osteoporosis patients or potential osteoporosis patients contain fossil coral as a main component. The fossil coral is obtained by heating, crushing and activating hermatypic coral; the crystal form thereof is aragonite powder with an average particle size within a range of 2.5-4 [mu]m. The bone density increasing agent of 1.5-5 g is administered every day once or in twice to four times for at least three months.



CN101570344
Preparation method of aragonite crystal form calcium carbonate
    
The invention relates to a preparation method of aragonite crystal form calcium carbonate, comprising the following steps: lime is sent into a digestion equipment and added with water for digestion treatment, water and quick lime are added slowly according to the ratio of 3:1 to 5:1, calcium hydroxide emulsion is obtained by filtrating, the calcium hydroxide emulsion is sent into a carbonization equipment, magnesium hydroxide needle crystal is added as a seed crystal, CO2 is injected in the materials which are mixed at the same time, aragonite crystal form light calcium carbonate is obtained by carbonization reaction; the light calcium carbonate screened pulp is sent into a filtration device for dehydrating and calcium carbonate filter cake is obtained; the sodium polyacrylate is added as a dispersant and light calcium carbonate with particle size distribution of 1-2 mum is obtained after grinding, thus obtaining a dispersion liquid product which reachs 70% of solid content or the liquid product is sent into a drying device for drying to obtain light calcium carbonate dry powder. The preparation method enjoys cheap price, simple preparation process and perfect performance, thus being applicable to the industrialized production. The obtained aragonite crystal form calcium carbonate is suitable to be a papermaking coating.



US2009263506
CALCAREOUS ORGANISM GROWTH ACCELERATOR
    
The purpose of this invention is to provide compositions useful for promoting the growth of calcareous organisms present in a closed system aquatic habitat. Particularly, to composition capable of efficiently delivering calcium and carbonate to the calcareous organisms. Most particularly, to a composition effective for enhanced delivery of aragonite to a closed system aquatic habitat where it dissociates into bioavailable supplements, such as, calcium, strontium, magnesium, and carbonate ions, whereby enhanced growth of the calcareous organisms is achieved.



CN101538059
Preparation method of superstructure aragonite calcium carbonate crystal

The invention relates to a preparation method of superstructure aragonite calcium carbonate crystal, belonging to the technical field of inorganic material. The existing method for preparing the aragonite calcium carbonate has the problems that the preparation technique is complex and the reaction condition is not easy to control, etc. The preparation method comprises the following steps of: adding water-soluble calcium salt and urea into hydrophilic polymer solution in sequence, stirring, dissolving, transferring the obtained mixing solution to a sealed container, placing the sealed container in a constant temperature oven, keeping the temperature of 60-110 DEG C constantly for 4 to 24 hours, carrying out solid-liquid separation on the mixed solution after the constant temperature is ended, cleaning and obtaining the superstructure aragonite calcium carbonate crystal.; The invention has the advantages of simple preparation technique and easy control of condition and the like



EP2159197
Method and device for treating water

Water treatment method comprises passing water through a membrane filtration system having a membrane filter (1) and filtering out particles that are larger than the pores of the membrane filter. The system in the direction of water flow, exhibits an upstream water treatment device (3) and a downstream device that has an equivalent effect of the water treatment device. In the water treatment device, by the introduction of metal ions in the water, the chalk dissolved in water is transformed partially to calcium carbonate particle, preferably predominantly in the aragonite-form. An independent claim is included for a device for treating water comprising the membrane filtration system. Metal ions, preferably zinc ions are added to water.



JP2009067605
METHOD FOR PRODUCING ARAGONITE TYPE CALCIUM CARBONATE WITH HEXAGONAL PLATE FORM
    
PROBLEM TO BE SOLVED: To provide a method for producing calcium carbonate with a hexagonal plate shape by using a soluble calcium salt aqueous solution, a soluble carbonate aqueous solution and a surfactant and to provide calcium carbonate with the hexagonal plate form as a functional additive for a resin, a rubber, a coating material, papermaking, cosmetics and the like. ;SOLUTION: Aragonite type calcium carbonate with the hexagonal plate form is produced by the method that the surfactant is dropped into the soluble calcium salt aqueous solution and the soluble carbonate aqueous solution so as to have a concentration above the micelle concentration and reacted at 40[deg.]C or higher.



WO2009009553
FINE, STEEP ARAGONITE FOR COATING

Disclosed herein are precipitated calcium carbonate compositions for coating exhibiting at least one of improved opacity, sheet gloss, print gloss, and brightness. The precipitated calcium carbonate compositions may be characterized by having a crystalline aragonite content of greater than or equal to about 30% by weight relative to the total weight of the composition, less than or equal to about 10% by weight of particles having a particle size less than or equal to about 0.25 microns, less than or equal to about 4% by weight of particles having a particle size greater than or equal to about 2.0 microns, and a particle size distribution steepness of greater than or equal to about 50. Also disclosed herein are coating compositions comprising at least one precipitated calcium carbonate composition of the present disclosure.



CN101284648
Industrial nano-water and uses

The invention provides industrial nanometer water. The water composition of the industrial nanometer water simultaneously consists of small water clusters ((H2O)n(n is equal to 4 to 8), cations and anions; the cations and the anions form iron pair nuclei in the form of yin-yang coordination; and the size of the iron pair nuclei is larger than or equal to 0.5 nm and is smaller than or equal to 15 nm; the coordinated iron pair nuclei account for 67 percent to 97 percent of the total impure irons in the water; the crystal of the iron pair nuclei after being heated is water slag in a double crystal form, wherein, the aragonite crystals account for 45 percent to 65 percent, and the rest of crystals are calcite crystals.; The industrial nanometer water, after being injected into a boiler, can solve the problem of nonconforming water quality caused by the boiler in the process of evaporation and concentration, as well as the problems of scaling and corrosion caused by residual hardness, improve evaporation rate and reduce energy consumption, thereby leading the boiler to reach the purpose of saving energy and reducing boiler water discharge.



KR20080081682
MANUFACTURE METHOD OF SINGLE PHASE

A method for preparing single phase aragonite is provided to produce the single phase aragonite having a uniform particle size distribution and a large aspect ratio through control of calcium ions. A method for preparing single phase aragonite includes the steps of:  preparing an aqueous sodium hydroxide solution; (2) adding calcium hydroxide powder to the aqueous sodium hydroxide solution to prepare a mixed solution; and (c) injecting an aqueous sodium carbonate solution at a predetermined rate to prepare the single-phase aragonite while stirring the mixed solution. The aqueous sodium hydroxide solution has a concentration of 0.25 to 5 M. Further, a concentration of the aqueous sodium carbonate solution is 0.5 to 3M and an input rate is 100 to 250 ml/minute.



CN101230207
Processing technique for natural biological calcium carbonate powder filler

The invention discloses a processing technology for natural biological calcium carbonate miropowder filling material. The processing technology comprises the steps that pretreatments of water washing, drying and coarse grinding are performed to the natural biological material, then the pretreated material is crushed and graded, to obtain natural biological calcium carbonate filling material which is smaller than 38 micrometers, the crushed and graded natural biological calcium carbonate filling material is baked for 0.01 to 24 hours at 100 to 900 DEG C in a high-temperature furnace, and the natural biological calcium carbonate miropowder filling material is obtained through air oxidation. The invention has the characteristics that the processing technology can maintain an aragonite crystal form in natural shells to the largest extent, and can main the heterogeneity and the strong polarity of the microcrystalline surface of the natural shells to the largest extent, so that the shell miropowder has a superior micropore structure; the filling material can obviously improve the mechanical property and the hot property of high molecular material, and simultaneously the pollution problem caused by shells and egg shells to the environment is also solved.


   
CA2635023
CONTROL OF PARTICLE SIZE OF ARAGONITE PRECIPITATED CALCIUM CARBONATE

The present invention is related to a method of controlling particle sizes of aragonite-type precipitated calcium carbonate comprising the steps of manufacturing various-sized calcium hydroxide through the hydration reaction of CaO, which is caustic lime, while changing the solid-liquid ratio of caustic lime and the initial reaction temperature to 10 ~ 80 ~G stabilizing calcium hydroxide by adding the aqueous solution of sodium hydroxide to the suspension of calcium hydroxide; supplying the aqueous solution of sodium carbonate while stirring the suspension in the above stabilizing step; and washing, filtering, and drying the above suspension of calcium carbona



JP2008222534
LEAF-LIKE AND FOLDED ARAGONITE PARTICLE SYNTHESIZED FROM CARBONATE AND METHOD FOR MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide leaf-like and folded aragonite particles synthesized from a carbonate, and to provide a method for manufacturing the particles. ;SOLUTION: After a carbonate is dissolved in an acid, the solution is adjusted with an alkali solution to the pH corresponding to the aimed form. Then CO<SB>2</SB>gas is blown into the solution to obtain a leaf-like and tubular crystallized material having an aragonite structure. The method for manufacturing the particles is also provided.



JP2008222533
ACICULAR OR COLUMNAR PARTICLE OF CALCIUM CARBONATE HAVING HIGH PURITY ARAGONITE STRUCTURE FORMED BY CARBON DIOXIDE BUBBLING METHOD, AND METHOD FOR MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide an acicular or columnar crystallized material having a high purity aragonite structure requiring no additive and to provide a method for manufacturing the crystal. SOLUTION: After ammonium water is added to the aqueous solution of calcium chloride to adjust the pH corresponding to the aimed form, CO<SB>2</SB>gas is blown at a temperature of 60[deg.]C or higher to produce a crystallized material having an aragonite structure. The method for manufacturing the crystal is also provided.



CA2635233
NOVEL MANUFACTURING METHOD OF ARAGONITE CALCIUM CARBONATE

The present invention is related to the methods of manufacture of aragonite in the carbonation method, in which the particle size and aspect ratio may be controlled and practically 100%-pure and single-phase aragonite may be obtained by repeating the carbonation reaction.



CA2633808
MANUFACTURE METHOD OF SINGLE PHASE ARAGONITE PRECIPITATED CALCIUM CARBONATE BY CONTROLLING CALCIUM ION

The present invention is related to the methods of manufacture of single-phase aragonite by controlling calcium ions, particularly, to the methods of manufacture of single-phase aragonite in the solution process by controlling the rate of elution of calcium ions in the suspension of calcium hydroxide by adding the highly concentrated aqueous solution of sodium hydroxide to the suspension of calcium hydroxide and adding the aqueous solution of sodium carbonate to the above mixed aqueous solution at a constant rate. The method of manufacture of single-phase aragonite according to the present invention is characterized by containing no calcite practically since this method is comprised of the steps of manufacturing a suspension in which calcium hydroxide is dispersed in distilled water; controlling calcium ions in the suspension of calcium hydroxide by adding the aqueous solution of sodium hydroxide to the suspension; and supplying the aqueous solution of sodium carbonate at a constant rate while stirring the suspension of calcium hydroxide.
    


WO2006086783
CONVERSION OF SEA-SHELLS AND OTHER CALCITE-BASED AND ARAGONITE-BASED MATERIALS WITH DENSE STRUCTURES INTO SYNTHETIC MATERIALS FOR IMPLANTS AND OTHER STRUCTURES AND DEVICES

Bulk materials for implants made from hydrothermal conversion of bulk calcium carbonate materials with desired initial structures in order to utilize the mechanical and structural properties of the initial structures. Dense sea-shells, light-weighted sea urchin spines and strong marine bones such as cuttlebones are examples of bulk calcium carbonate materials with desired initial structures for producing various implants.



US2003161894
Precipitated aragonite and a process for producing it

Disclosed is a novel form of particulate precipitated aragonite, and a novel process for producing it.



US6156286
Seeding of aragonite calcium carbonate and the product thereof

Fine-grained aragonite precipitated calcium carbonate is produced on a commercial scale by seeding with a coarse-grained aragonite precipitated calcium carbonate. The coarse-grained seeding material is produced by interrupting, after the production of 0.1 to 0.6 g/L min. of calcium carbonate, the supply of carbon dioxide to the quicklime slurry early in the reaction to allow subsequent nucleation of the crystals and then continuing the supply of carbon dioxide at reaction rates of 0.1 g/L min. to 0.6 g/L min. This coarse-grained seeding material has a Blaine surface area which may be less than 30,000 cm2/g, the solids of which are 35 to 70 weight percent aragonite, and is added to subsequent batches as a slurry at about 1 weight percent, based on the total weight of the slurry of the material to be seeded. For the seeded batches, carbonation is carried out at reaction rates of up to 1.8 g/L min. at the commercial scale resulting in fine-grained aragonite product. This final seeded product need not be ground, has solids in which the weight percent of aragonite is greater than 90, has a median particle size between 0.30 to about 0.5 microns, a particle size distribution where about 60 to 70 weight percent are less than 0.5 micron equivalent spherical diameter, and a Blaine surface area which may be greater than 35,000 cm2/g



US2002160051
Homeopathic medicine comprising one or several mother-of-pearl constituents including bio-aragonite

A homeopathic medicine which includes at least biocompatible mother-of-pearl bio-aragonite. The medicine is used for treating pain of bone origin and in particular related to bone diseases cause by a pathology, pre-menopause or post-menopause estrogenic deficiency, ageing, cancer or trauma and to cartilaginous disorders, particularly osteoarthritis.



US2001033820
Precipitated aragonite and a process for producing it

Disclosed is a novel form of particulate precipitated aragonite, a novel process for producing it and compositions containing it.



US5164172
PROCESS FOR PRODUCING ARAGONITE CRYSTAL FORM CALCIUM CARBONATE WITH ACICULAR SHAPE

Disclosed is a process for producing aragonite crystal form calcium carbonate with an acicular shape characterised by premixing aragonite crystal calcium carbonate and Ca(OH)2 to prepare an aqueous slurry, adding a water-soluble phosphoric acid compound into the aqueous slurry, and introducing CO2 gas into the aqueous slurry to cause the carbonation reaction to take place. According to the present invention, aragonite crystal form calcium carbonate in an acicular shape with a large particle size is produced.



US6071336
Acicular calcite and aragonite calcium carbonate

The present invention relates to a calcium carbonate composition having both calcite and aragonite crystalline morphology. More particularly, the present invention relates to an acicular calcite and an acicular aragonite product and a method for the production of the same and the use of such as fillers, additives and modifiers of consumer and commercial products such as toothpaste, paper, plastics and sealants. The acicular calcite/aragonite composition of the present invention provides a balance of properties such as sheet bulk, strength, stiffness, and sizing, when employed as a filler for paper. As a coating pigment, the acicular calcite/aragonite product of the present invention provides gloss characteristics suitable for dull and matte grades of low gloss coated paper. Upon further processing such as milling, grinding, or other means of comminution, the resulting product provides gloss characteristics suitable for high gloss coated paper. For paint formulations, the acicular calcite/aragonite composition of the present invention provides properties such as low sheen and high contrast ratio. As an additive in polymers, the acicular calcite/aragonite product of the present invention imparts reinforcing properties, rigidity, and impact strength, including sealant applications.
 


US6022517
Acicular calcite and aragonite calcium carbonate

The present invention relates to a calcium carbonate composition having both calcite and aragonite crystalline morphology. More particularly, the present invention relates to an acicular calcite and an acicular aragonite product and a method for the production of the same and the use of such as fillers, additives and modifiers of consumer and commercial products such as toothpaste, paper, plastics and sealants. The acicular calcite/aragonite composition of the present invention provides a balance of properties such as sheet bulk, strength, stiffness, and sizing, when employed as a filler for paper. As a coating pigment, the acicular calcite/aragonite product of the present invention provides gloss characteristics suitable for dull and matte grades of low gloss coated paper. Upon further processing such as milling, grinding, or other means of comminution, the resulting product provides gloss characteristics suitable for high gloss coated paper. For paint formulations, the acicular calcite/aragonite composition of the present invention provides properties such as low sheen and high contrast ratio. As an additive in polymers, the acicular calcite/aragonite product of the present invention imparts reinforcing properties, rigidity, and impact strength, including sealant applications.



US4054464
Method for making cement using aragonite

An improved process for making cement wherein aragonite, a natural orthorombic crystalline form of calcium carbonate, is employed in a substantially dry, naturally recovered, unprocessed state as the calcium carbonate constituent. The raw kiln feed of the aragonite and argillaceous materials can be introduced into the kiln together and/or separately to produce the desired raw kiln clinker feed within the kiln. The argillaceous material employed can be in a substantially dry state or can be present as an aqueous slurry.



US5993541
Process for nucleation of ceramics and product thereof

A process for controlling the formation of ceramics, achievable under ambient conditions, includes preparing a crystallization medium of a ceramic parent solution and spreading an organic monolayer of a hydrogen-bonded network on the air-liquid interface of the solution. For the formation of aragonite, the process uses an undoped calcium bicarbonate solution and a hydrogen-bonded network with a structural motif approximately matching a calcium ion distance in the a-c plane of aragonite. The aragonite product formed has a [010] axis approximately perpendicular to the monolayer. For perovskite materials, such as BSTO ceramics, the microstructure of the product is controlled by changing different functional groups of the organic monolayer which has been spread on the surface of a perovskite parent solution.



US4552683
Gas desulfurization reactant

A process for controlling the formation of ceramics, achievable under ambient conditions, includes preparing a crystallization medium of a ceramic parent solution and spreading an organic monolayer of a hydrogen-bonded network on the air-liquid interface of the solution. For the formation of aragonite, the process uses an undoped calcium bicarbonate solution and a hydrogen-bonded network with a structural motif approximately matching a calcium ion distance in the a-c plane of aragonite. The aragonite product formed has a [010] axis approximately perpendicular to the monolayer. For perovskite materials, such as BSTO ceramics, the microstructure of the product is controlled by changing different functional groups of the organic monolayer which has been spread on the surface of a perovskite parent solution.



US6264740
Inorganic cementitious material

A method of producing a new type of cement, hereafter called Conch-krete. Conch-krete is created by adding sodium carbonate (also known as soda ash, natron, etc.) and one or more minerals from the calcium carbonate group (including aragonite, limestone, calcite, marble, dolomite, etc.) and the addition of water to the mix that will harden into a cement-like material. The combination of sodium carbonate and calcium carbonate can be either layered or in a mixed state. An exothermic reaction starts after the addition of water. The composition of Conch-krete can vary between 20% sodium carbonate and 80% calcium carbonate to 80% sodium carbonate and 20% calcium carbonate. Conch-krete can be used in a variety of applications not inclusive of forming bricks, interior architecture, table or counter tops, ornaments, repairing damaged cement products, casting and other applications not mentioned above.



US4424197
Gas desulfurization

A process for adsorbing sulfur dioxide from a gas comprising contacting a gas containing SO2, such as a flue gas, with about stoichiometric amounts of a specially prepared calcium oxide so that substantially all of the sulfur dioxide content is reacted throughout the calcium oxide particle to form a calcium sulfate reaction product. The useful calcium oxide particles comprise a highly voided skeletal structure of very large surface area and large pore volume with numerous macro pores. Such particles are obtained by flash calcining sand-size grains of calcium carbonate, such as aragonite, calcite or dolomite.



US3686372
METHOD FOR MAKING CEMENT

In the process for making cement, especially Portland cement, the degree of grinding required for the calcareous reactant material can be decreased by using aragonite, a calcium carbonate bearing mineral.



US6936172
Catalytic treatment of hard water in a reverse osmosis system

A water treatment system which comprises a reverse osmosis device having a fluid inlet, a permeate outlet and a concentrate outlet with a pump to pump a fluid through the reverse osmosis device, and a magnetic treatment device situated upstream of the fluid inlet, and filter means arranged to filter fluid from the concentrate outlet prior to recycling the fluid upstream of the magnetic treatment device. When a plurality of passes, the system reduces membrane fouling as the crystal structure of the precipitate is changed to reduce the amount of calcite to a deposit which precipitates mostly as aragonite.



US3890107
Materials useful for prosthetic devices and the like    

A material useful as a biomaterial for the manufacture of prosthetic devices and the like is provided by a synthetic material characterized by having the microstructure corresponding to the microstructure of porous carbonate skeletal material of marine life, such as marine invertebrate skeletal material, e.g. echinoid spine calcite and Porites skeletal aragonite. Such synthetic materials are prepared by producing a replicate in negative or positive form of the microstructure of the aforesaid porous carbonate skeletal material.



US7997231
Composition suitable for aquatic habitat repair, replacement and/or enhancement

The current invention provides an improved material for the repair, replacement, and/or enhancement of aquatic habitats. It is a composition for use as a replacement for concrete or as a coating for concrete in structures such as artificial reefs. The combination of calcium carbonate (preferably Aragonite), a resin (preferably a marine use resin or Dion ISO 6631), and a catalyst results in a composition that is strong, durable, easy to use, and compatible with aquatic life. The current invention can be used to fabricate structures for use as a foundation for the repair and regeneration of damaged coral reefs. The organically enhanced nature of the composition facilitates the attachment and growth of coral and algae and is compatible with other aquatic life. The composition can be fabricated into slab form and used as a surface for coral farming/seeding for eventual transplantation of live coral species. The composition can be used to fabricate artificial reef modules as described in the prior art and to duplicate certain species of hard coral. This product can also be used to build structures that will help protect shorelines from erosion. When cast in a molded process, the composition can be used for the formation of aesthetically pleasing formations (replicas of hard coral species) that are also suitable for use in aquariums. The composition can also be used.



US2003213937
Precipitated aragonite and a process for producing it

Disclosed is a novel form of particulate precipitated aragonite, and a novel process for producing it.



US4869621
Method of sealing permeable earth surface or subsurface materials having alkaline conditions by induced precipitation of carbonates

A method of artificially sealing cracks, fissures or other voids in earth strata under alkaline conditions, or in alkaline structural materials. Sealing is effected by induced precipitation of calcium carbonate, usually in the form of calcite, either in alkaline rocks, in other rocks where alkaline groundwaters are present, or in structures of alkaline materials such as cement or marble. A number of examples are discussed for effecting the desired precipitation including application of aqueous solutions which affect either calcium or carbonate ion concentration, increasing pH by degassing of carbonated water and application of slurries of less stable forms of calcium carbonate (aragonite and vaterite) to result in precipitation of the more stable form (calcite).



US7097819
Method for producing calcium carbonate

Calcium carbonate in the form of aragonite crystals suitable for use as a filler for papermaking to give useful properties for bulk, whiteness, opacity, wire abrasion and yield is obtained by taking advantage of the causticization step. Herein disclosed is a process for producing calcium carbonate in the form of aragonite crystals which is useful as a filler for papermaking via the causticization step of the sulfate or soda pulping process, comprising adding an aqueous alkaline solution having a hydroxide ion level of 3 mol/l or less and containing 0.25 mol or less of carbonate ion per 1 mol of quick lime to quick lime and/or slaked lime at a quick lime concentration of 1-60% by weight with stirring to prepare milk of lime, and then adding green liquor to said milk of liquor at a loading rate of 0.002-0.12 g (sodium carbonate)/min/g (quick lime); to perform a causticization reaction at a temperature of 30-105 DEG C.



US5563124
Osteogenic product and process

Disclosed is a product which includes calcium carbonate and bone growth factor useful for the promotion of bone formation when implanted in the body. The calcium carbonate is preferably in the form of aragonite which can be recovered from naturally occurring coral. A preferred bone growth factor of the present invention is a protein mixture purified from bone. Also disclosed is a process for the induction of bone formation which includes implanting the product in a body. The product and process of the present invention are particularly useful in hip replacement operations, knee replacement operations, spinal fusion operations, repair of periodontal defects, treatment of osteoporosis, repair of bone tumor defects and repair of bone fractures.



US6322592
MACRO-POROUS COMPOSITE SUPPORT FOR MEDICINAL SUBSTANCE(S)....

The invention relates to a macro-porous composite that can be used as a bone reconstitution material characterised in that it is made up of a combination of synthetic aragonite and at least one medicinal substance such as notably, an antibiotic. The invention also relates to a method of producing a composite characterised in that it consists of producing a mixture comprising grains of synthetic aragonite and at least one porogenic agent, compacting said mixture and heating the product obtained in such a way as to eliminate said porogenic agent, at least one medicinal substance being included before or after said step of eliminating of said porogenic agent.



WO9840458
A SELECTED CRYSTALLINE CALCIUM CARBONATE BUILDER FOR USE IN DETERGENT COMPOSITIONS

An inexpensive detergent builder in the form of a selected crystalline calcium carbonate is provided. Specifically, the crystalline calcium carbonate has a tabular crystalline structure with {0,1,0} and {1,1,0} crystallographic indices. The crystalline calcium carbonate can be aragonite that has been specially modified to a tabular crystalline structure with {0,1,0} and {1,1,0} crystallographic indices. The crystalline calcium carbonate of the present invention is extremely inexpensive because it can be readily formed from inexpensive naturally occurring aragonite, and it performs well even when used at large median particle sizes.



US4231979
High surface area permeable material

Three-dimensional structures providing a plurality of separate interpenetrating, three-dimensional domains or channels or flowpaths, each of said domains or channels or flowpaths being a closed system of connected porosity or permeability and each of said domains or channels or flowpaths being interpenetrating within said structure, have been prepared. These structures are prepared from porous permeable precursor materials having a single three-dimensional domain or channel or flowpath as described above. Suitable precursor materials are provided by the abundant porous carbonate skeletal material of marine life, e.g. the coral Porites skeletal aragonite. For example, by coating the surfaces of such materials with a liquid material capable of being cured or set to a solid, followed by curing or setting and dissolution, e.g. chemical etching, of the coated skeletal material, there is produced a three-dimensional structure in accordance with this invention possessing two separate interpenetrating, three-dimensional domains or channels or flowpaths defined by the residual cured or set coating material. The resulting structure of this invention can be adapted such that a fluid can be applied to one side or face of the structure to flow into and out of such structure via only one of said channels or flowpaths and when so adapted can be employed in apparatus for the treatment or handling of one or more of the fluid streams flowing therethrough.



US5480827
Use of porous polycrystalline aragonite as a support material for in vitro culture of cells

.A three-dimensional solid support for the in vitro cultivation of cells consists essentially of porous polycrystalline aragonite in the form of a cylinder, sphere or plate. The support may be used to successively grow layers of different cells on the support, and is particularly useful for cultivating endothelial cells, fibroblasts and bone marrow cells.



US5376343
Production of purified calcium carbonate

A method of producing relatively pure calcium carbonate from a relatively impure source of calcium oxide, characterized in that the method comprises the steps of slaking the calcium oxide source in water to produce an aqueous hydrated lime slurry; treating the slurry by the addition thereto of a water soluble source of anions which anions are capable of forming a salt with calcium ions which salt has a dissociation constant greater than the dissociation constant of calcium hydroxide; separating the solid content of the slurry from the liquid fraction content thereof to obtain a substantially solids-free solution of calcium ions and anions; intimately contacting the solids-free liquid fraction with carbon dioxide gas at a selected rate to maintain the temperature of the solution within a specific range and to lower the pH of the solution to a pre-set value conducive for the formation of a precipitate of calcium carbonate in which one of the crystalline forms, selected from the group consisting of calcite, vaterite and aragonite, predominates; and separating the precipitated calcium carbonate from the mother liquor.



WO0066509
PIGMENT COMPOSITION FOR PAPER COATING, PAPER COATING USING THE SAME AND METHOD OF COATING PAPER

A pigment composition for use in coating a paper product such as a solid bleached sulfite product to give a combination of improved sheet brightness and gloss, comprises a blend of at least two particulate inorganic materials namely (a) a high brightness ultrafine kaolin produced from a blocky kaolin clay, the kaolin having a median particle size less than about 0.5 microns ( mu m); and (b) a fine coating precipitated calcium carbonate (PCC), which may be of predominantly aragonite or rhombohedral crystal form, having a median particle size less than about 0.8 microns; the ratio by weight of the PCC to the kaolin being greater than 1.0.



UA78408
METHOD FOR RECEIVING CHEMICALLY PRECIPITATED CALCIUM CARBONATE

The invention relates to the waste recycling technology of sodium carbonate manufacture. The method for receiving chemically precipitated calcium carbonate derived from sodium carbonate manufacture waste includes separation of solid phase from distilled waste liquid for caustic ash production by ammoniac method, carrying out of sedimentation process by distilled waste liquid with sodium carbonate solution mixing, separation of obtained calcium carbonate from mother solution, washing out and residue drying. The precipitation process is carried out by simultaneous distilled water mixing with sodium carbonate solution for 3-5 minutes at the temperature of 70-90 DEGREE C at that the specified solutions are taken in the mole ratio 1:1. The use of this invention allows to receive finely dispersed calcium carbonate in the form of mixture of calcite crystals (55-60 mass %) and aragonite (40-45 mass %), volume weight up to 0.25 g/cm3 and specific surface area of the substance to approximately 11.3 g/m2.



UA62319
A PROCESS FOR PRODUCING THE FLUXED BLAST-FURNACE AGGLOMERATE

A process for producing the fluxed blast-furnace agglomerate comprising storing and averaging the raw materials by forming a stack, preparation of fuel up to agglomeration, preparation of calcium-containing component of organogenic origin by fining and sieving thereof, dosing the charge components (agglomeration mixtures, fuels, calcium-containing component and agglomerate recycle), mixing, wetting and palletizing the sintering mix, loading thereof to the sintering machine and sintering the prepared material with obtaining agglomerate, and additionally as calcium-containing component of organogenic origin the limestone based on aragonite and ankerite is used, for example, foraminiferal and/or ostracode limestones at a ratio of 100 parts of aragonite per ( ) parts of ankerite, at that the calcium-containing component being laid directly into the stack.



RU2336684
METHOD REVEGETATION OF AFFECTED SOILS

FIELD: agriculture. ^ SUBSTANCE: invention refers to ecology. Method includes introduction of chemical production waste on soil surface. Waste is soda production sludge waste in amount 10-40 kg/m2. Ploughing then follows. After that additionally activated sludge of chemical plant treatment facilities is introduced in amount 4-5 kg/m2 with following plant seed sowing. Soda production sludge waste contains wt %: calcite (CaCO3) -79-97, aragonite (CaCO3)-1-2, dolomite- up to 1, quartz - 1-8, water - the rest. Activated sludge of chemical plant treatment facilities contains wt %: mineral substances-53-78, organic substances - 22-47 including total nitrogen up to 3.6 %, phosphorus up to 4.8 %. Plant seeds are preferably as follows: lady grass, meadow clover, Lucerne, spear-grass. ^ EFFECT: steady vegetative recover of affected soils, neutralisation of soil toxicity and utilisation chemical waste.



RU2286953
DRINKING WATER

FIELD: food industry. ^ SUBSTANCE: invention relates to production of drinking water that can be used to prevent urolithiasis arising when consuming hard water saturated with magnesium salts and also osteoporosis developing at severe deficiency of calcium in body. Drinking water containing calcium in carbonate form is produced via passage of natural water having carbonate hardness at least 3 mg-equ/L through globular-structure polymer having permeability up to 8 L/min and structural matrix depicted by following formula: . Thus obtained drinking water contains calcium carbonate in soluble form easily assimilated by human body and manifesting after boiling as aragonite, whose content constitutes 60-80% of the weight of calcium carbonate. ^ EFFECT: improved consumer's properties of water.



RU2280115
CALCIUM CARBONATE COATING COMPOSITIONS FOR IMPARTING HIGH GLOSS...

FIELD: paper-and-pulp industry. ^ SUBSTANCE: calcium carbonate product is designed for containing paper and comprises mixture of first and second separate calcium carbonate particles, wherein difference between first and second calcium carbonate particles ranges from about 0.1 mum to 0.2 mum and weight ratio of first to second particles lies between about 50:50 and about 80:20. Pigment is intended for coating paper and made from above-defined product. Method concerns containing paper and comprises preparation of mixed pigment based on calcium carbonate precipitated in the form of aragonite having above-indicated makeup; addition of binder; and deposition of the pigment onto a base paper in the form of binder-containing suspension. Paper is then dried and calendared. Also described are: paper obtained by above method; a method to increase gloss of paper sheet involving operation of including above product into base paper coating suspension; a method to increase gloss of paper involving operation including calcium carbonate product wherein first calcium carbonate particles have average size about 0.4 mum and the second ones about 0.5 mum at their weight ratio 60:40, respectively; a method to increase gloss of paper sheet involving operation of including pigment based on argonite-type calcium carbonate with difference between first and second average particle size values from about 0.1 mum to 0.2 mum and their weight ratio between about 50:50 and about 80:20 into base paper coating suspension. ^ EFFECT: increased gloss of coated paper sheets



RU2188163
WASHING LIQUOR TREATMENT METHOD

SUBSTANCE: invention concerns methods for treatment of carbonate-containing washing liquors after washing of transport tanks. Part of washing liquor is mixed with lime and settled at temperature above 43 C to precipitate calcium carbonate in the form of aragonite. The rest of washing liquor is filtered through this aragonite cake. Surface of aragonite crystals is capable of adsorbing significant amounts of crude oil and for that reason this filtration layer can be used for filtration of such an amount of exhausted lye that is at least threefold larger than its amount required for preparation of indicated filtration layer for preliminary filtration. EFFECT: increased cleaning degree and intensified recovery of precipitate from washing liquor.



KR20010088513
WATER SOLUBLE CALCIUM CARBONATE AND METHOD FOR PREPARING PRODUCT CONTAINING THE SAME

PURPOSE: A water-soluble calcium carbonate is provided to effectively employ it invarious applications including pharmaceuticalor cosmetic materials, food and/or health foods by forming ultrafine granules thereof and surface-coating them. CONSTITUTION: The calcium carbonate is produced by the following steps of preparing Ca(OH)2 solution by calcinating calcium material and coal to obtain CaO then adding water to slake the obtained CaO; introducing CO2 to the solution to generate CaCO3 by chemical reaction; controlling particle size of the obtained calcium carbonate material; coating the respective particles with desired coating agent to protect the particles from agglomeration together; concentrating the coated particles into a liquid material; and drying and grinding the concentrated material into a powdery product. The calcium material includes at least one of lime, marble, aragonite, white rock, calcite, iceland spar, coral, shells, bone and/or eggshells. The particle size is ranged from 0.0001-10 micrometer.



KR100345395
METHOD FOR INSOLUBILIZING CALCIUM IONS ELUTED FROM WASTE

PURPOSE: Provided is a method for insolubilizing calcium ions eluted from waste. The method controls the pollution of soil and ground water by insolubilizing calcium ions eluted from shell waste and lime waste. Calcium carbonate named as Aragonite and organic calcium are contained in the shell waste and increase pH of water to 10-11 through hydrolysis. Therefore, the calcium carbonate and the organic calcium are insolubilized by this method. CONSTITUTION: The method is characterized by insolubilizing calcium ions by using sodium phosphate or potassium phosphate buffer solution and neutralizing pH. The buffer solution is made from the mixture of phosphate (I) and (II) or phosphate (I) and (III).



KR970001526 / JPH01261225
PROCESS FOR THE PREPARATION OF ARAGONITE TYPE CALCIUM CARBONATE

PURPOSE:To efficiently produce calcium carbonate of aragonite crystal form industrially, by slaking CaO with H2 to form water slurry of Ca(OH)2 and carbonating the slurry under a specific condition. CONSTITUTION:Lime stone is calcined to form CaO, which is slaked with H2O having the molar ratio to CaO of <=15 in case of <=70 deg.C water temperature and with water in any amount in case of >70 deg.C water temperature to give water slurry of Ca(OH)2. Then the water slurry is adjusted to 5-40wt.% concentration and 5-65 deg.C temperature and carbonated with a CO2 gas in an amount of 4l/min/kg Ca(OH)2 (calculated as 100% CO2 gas) to give the aimed calcium carbonate. The aragonite excellently exhibits its characteristics in the field especially of paper manufacturing and plastics.; In paper manufacturing field, since aragonite has more excellent dispersibility than calcite, aragonite exhibits excellent opacifying power when used as a loading material or pigment of coating color.



JP2008115351
INTERIOR MATERIAL HAVING DEODORIZING, ANTIBACTERIAL, AND HUMIDITY-CONDITIONING PROPERTIES

PROBLEM TO BE SOLVED: To provide an interior material being high in use safety and having excellent deodorizing, antibacterial, and humidity-conditioning properties. ;SOLUTION: A compounded coating material is prepared by compounding 45-60 wt.% aragonite-based natural fossil coral powder pulverized to a grain size of 30 μm or less and at least containing 35 wt.% or more calcium, 0.3 wt.% or more magnesium, and a minute amount of a transition metal oxide with 25-35 wt.% artificial zeolite powder having a specific surface area of 120 m<SP>2</SP>/g, 12-20 wt.% vehicle consisting of a water-soluble acrylic ester or its copolymer, and 2-5 wt.% nonionic or amphoteric surfactant. To the compounded coating material, water in an amount of 20-30 wt.% of the coating material is added, mixed, and kneaded in a high viscosity state, and then water in an amount of 10-20 wt.% of the total amount of the resultant coating material is added, mixed, and kneaded in a lowly viscous state, to thereby prepare the objective interior material in a state of coating material.



JP5015457
TUBULAR CALCIUM CARBONATE

PROBLEM TO BE SOLVED: To provide new tubular calcium carbonate and a method for easily producing the calcium carbonate. ;SOLUTION: The tubular calcium carbonate consists of columnar aragonite which is hollow in the longitudinal direction and is open at both ends. The calcium carbonate is obtained by dropping a calcium hydrogen-carbonate aqueous solution or sea water in which other inorganic electrolytes may be present, in a saturated or supersaturated state of calcium hydrogen-carbonate into hot water.



JP5156974
HYDROGEN GENERATOR AND FUEL CELL

PROBLEM TO BE SOLVED: To provide a hydrogen gas generator in which raw materials are inexpensive and a production process is simple, and to configure a fuel cell using generated hydrogen as fuel. ;SOLUTION: The hydrogen generator comprises a reacting substance prepared by mixing calcium oxide and/or magnesium oxide with at least ≥1% of aluminum and a water permeable container containing the reacting substance, wherein hydrogen is generated by immersing the water permeable container in water. The water permeable container is a bag-like container made of a nonwoven fabric or cotton cloth. The calcium oxide is obtained by firing limestone, calcite, aragonite or stalactite at 1,000-1,200°C and pulverizing it. The aluminum is obtained by reducing a metal aluminum ingot or an aluminum product to powder.



JP2006298738 / JP2006298737
SPECIAL MINERAL WATER FOR MANUFACTURING HEAT RESISTANT, FIRE RESISTANT AND REINFORCED CONCRETE AND ITS MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide special mineral water for inexpensively manufacturing concrete excellent in heat resistance, fire resistance and strength and its manufacturing method. ;SOLUTION: The special mineral water contains a Ca ion of 200-1,000 ppm, an Fe ion of 3-30 ppm and carbon dioxide of 0.001-0.05 mol/kg. The mineral water is manufactured by the method that ferric oxide is charged in an acid water in which heaped aragonite is dissolved in advance and that the dissolving amount of carbon dioxide is adjusted by charging dry ice after sufficient agitation.



JP4813075
METHOD FOR MANUFACTURING ARAGONITE-BASED ACICULAR CALCIUM CARBONATE

PROBLEM TO BE SOLVED: To provide a production method for less expensive high-quality calcium carbonate as raw material for paper making. ;SOLUTION: When a causticizing reaction is initiated by mixing green liquor generated in a causticizing step of a pulp manufacturing process by the sulfate process or soda process with quicklime, wherein the green liquor is in the same amount as the amount required to prepare white liquor in a conventional operation, the BET specific surface area, degree of crystallinity and particle size of slaked lime obtained by dry slaking of quicklime are specified, and by using the slaked lime, an aragonite content equal to that of acicular calcium carbonate obtained by a conventional causticizing method is achieved.



JP2004049212
HEALTH FOOD CONTAINING EASILY ABSORBABLE MINERAL AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To develop a health food containing mineral which is safe, of low cost, and well absorbable, and consists mainly of calcium. ;SOLUTION: A calcium carbonate source is pulverized into fine particles having a particle size of <=20 [mu]m through an integrated process in which a pulverizer spontaneously pulverizes the source by utilizing counter air currents generated in a pair of rotary vanes and then the pulverized calcium carbonate is subjected to air suction, so that absorbable properties of the calcium carbonate is improved. The calcium is prevented from being insolubilized in the small bowel, by using, especially, shells of cuttlefish which consist mainly of aragonite calcium carbonate and contain a chelate-forming substance, such as chitin, and pulverizing the shells into fine particles having the particle size of <=20 [mu]m, so that the health food having the high absorbable properties is developed. Further, a vitamin D content in a dried product of Shiitake mushroom (Lentinus edodes) is increased, by processing the dried product into fine particles having the particle size of <=20 [mu]m, so that the adsorbable properties of the calcium of the health food is improved by together using the Shiitake mushroom fine particles.



JP2003063820
METHOD FOR PRODUCING ACICULAR LIGHT PRECIPITATED CALCIUM CARBONATE AND PAPER CONTAINING THE CALCIUM CARBONATE

PROBLEM TO BE SOLVED: To provide a method for efficiently producing an aragonite type acicular light precipitated calcium carbonate having an excellent dispersibility because of the crystal particles being individually isolated without agglomeration, and also having a large particle size. SOLUTION: The method is characterized by reacting a carbon dioxide gas with a slurry containing calcium nitrate and magnesium hydroxide and having a fluid temperature of 60 deg.C or more.



JP4339528
METHOD FOR PRODUCING CALCIUM CARBONATE

PROBLEM TO BE SOLVED: To obtain an aragonite type calcium carbonate having a needle shape or a burr-like shape which can provide a useful performance as a filler and a coating pigment for papermaking by utilizing a caustification process. SOLUTION: Milk of lime is prepared in a caustification tank having 0.15-0.7 of d/D value which represents ratio of the blade diameter of the stirrer to the diameter of the caustification tank, and under a stirring condition of 0.1 kw/m<3> or more of P/V value which represents the stirring power provided per a unit volume of the milk of lime during the preparation of the milk of lime. And then, a caustification rection is carried out under a given addition rate of the green solution and temperature while stirring the stirrer with the stirring power of 0.1 kw/m<3> or more of P/V value during the reaction.



JP2002258039
SCATTERED POLARIZING MEMBER, LIGHT CONTROL METHOD AND SURFACE LIGHT SOURCE UNIT

PROBLEM TO BE SOLVED: To provide a scattered polarizing member which selectively indicates the response property of transmission and scattering concerning a polarizing component and to control a light by using the member. SOLUTION: A polymer for the matrix of the scattered polarizing member is dissolved in a volatile solvent and bar shape fine particles such as aragonite calcium carbonate are added. It is uniformly stirred and developed on a baseboard and, then, the solvent is vaporized. A remain film is extended in one direction by temperature being equal to or more than glass transition temperature and the internal bar shape fine particles are oriented along the extending direction. The polymer is selected as the one which has a refractive index where the consistency and the inconsistency of the refractive index co-exist in accordance with the polarizing component in a boundary with the bar shape fine particles. Orientation concerning the directivity of double refraction in the fine particles is realized by the orientation of the multiple bar shape fine particles. A transmission light and a scattered light are generated in the boundary in accordance with the polarizing component. The orientation can be realized by a method except the extension. The scattered polarizing member can be made to have a bulky shape.



JP4236818
METHOD FOR PRODUCING CALCIUM CARBONATE WHISKER

PROBLEM TO BE SOLVED: To produce calcium carbonate whisker useful as a functional filler for paper, plastics, rubbers, and the like by utilizing a caustification reaction. SOLUTION: This method for producing the calcium carbonate whisker, preferably aragonite crystal whisker-shaped calcium carbonate comprises adding an alkali aqueous solution containing <=0.1 mol of carbonate ion to 1 mol of calcined lime, stirring the mixture to prepare the lime milk, and continuously adding the prepared lime milk to an aqueous solution containing sodium carbonate as a main component at >=40 deg.C.



JP4346248
METHOD FOR PRODUCING CALCIUM CARBONATE OF ARAGONITE CRYSTAL SYSTEM

PROBLEM TO BE SOLVED: To obtain calcium carbonate of aragonite crystal system having a useful property which is excellent in apparent density, whiteness, opacity and printability, etc., for the filler for paper manufacture and pigment for coating by utilizing a caustification process. SOLUTION: Milk of lime prepared from quick lime or/and slaked lime and green liquor of the quantity required for making the desired concentration of white liquor are continuously introduced into the first reaction vessel among two successive reaction vessels or more and a caustification reaction is performed at a reaction temperature of 20-105 deg.C in such a manner that the concentration of the milk of lime comes to 10-60 wt.% expressed in terms of quick lime.; At this time, the flow rate of the milk of lime and the green liquor is adjusted in such a manner that the concentration of sodium hydroxide in the reaction vessel is 0.1-2.5 mol/l, preferably 0.5-2.0 mol/l and the concentration of sodium carbonate is <=0.5 mol/l, preferably <=0.25 mol/l, and the calcium carbonate of aragonite crystal system which is useful for the filler for paper manufacture and pigment for coating is thus obtained.



JP3563327
ANTIBACTERIAL AND ANTISEPTIC AGENT

PROBLEM TO BE SOLVED: To obtain an antibacterial and antiseptic agent utilizing a natural material, especially an antibacterial and antiseptic agent for cosmetic material. SOLUTION: This antibacterial and antiseptic agent contains an extract of aragonite as an active ingredient.



JP2001354416
METHOD FOR MANUFACTURING ARAGONITE TYPE CALCIUM CARBONATE

PROBLEM TO BE SOLVED: To provide a method for manufacturing aragonite type calcium carbonate in a single phase with high purity which can be manufactured at low reaction temperature in a suspension reaction liquid of high concentration in a large volume. SOLUTION: In the method for manufacturing aragonite type calcium carbonate, while a suspension liquid consisting of slaked lime, Mg2+ ion and water is stirred by making flows with different flowing directions in a tank, carbonic acid gas is introduced into the suspension liquid.



JP3902718
METHOD FOR PRODUCING CALCIUM CARBONATE HAVING ARAGONITE CRYSTAL SYSTEM

PROBLEM TO BE SOLVED: To obtain calcium carbonate having aragonite crystal system and useful as a filler or a pigment for various kinds of materials by using an alkaline aqueous solution when suspending quick lime and/or slaked lime and afterwards introducing carbon dioxide gas thereinto. SOLUTION: This calcium carbonate having aragonite crystal system is obtained by adding the alkaline aqueous solution containing carbonate ion in an amount of <=0.25 mol based on 1 mol of calcium hydroxide and having 0.01-2 M hydroxide ion concentration so that the concentration of the calcium hydroxide is regulated to 5-30 wt.% expressed in terms of the quick lime, blowing the carbon dioxide gas in an amount within the range of 0.5-10 L/min/kg CaO into the aqueous suspension prepared while stirred and carbonizing at a reactional temperature of 20-80 deg.C.



JP2787620
PRODUCTION OF ARAGONITE CRYSTAL FORM CALCIUM CARBONATE HAVING ACICULAR SHAPE

PURPOSE:To obtain aragonite calcium carbonate having large grain size and superior dispersibility by adding a soluble phosphoric acid compound to an aqueous slurry of calcium hydroxide, in which specific aragonite crystal form carcium carbonate is added, and blowing carbon dioxide. CONSTITUTION:At the time of forming calcium carbonate by blowing carbon dioxide into an aqueous slurry of calcium hydroxide, first aragonite crystal form calcium carbonate is formed into moisture-containing cake and then formed into slurry state by the addition of dispersant, followed by wet crushing. Subsequently, a slurry mixture in which the above crushed matter and an aqueous slurry of calcium hydroxide are previously mixed is prepared.; By adding a soluble phosphoric acid compound to the above slurry mixture and exerting carbonation by means of carbon dioxide, the desired aragonite crystal form calcium carbonate having acicular shape can be obtained. This calcium carbonate can be suitably used, in particular, for synthetic resin, papermaking, heat insulating material, etc. When used for synthetic resin, this calcium carbonate has a marked effect of providing rigidity as a filler for polypropylene in particular.



JP3299902
FOOD ADDITIVE CONSISTING OF NEEDLE-SHAPED OR COLUMNAR INORGANICS

PROBLEM TO BE SOLVED: To obtain a food additive by which settlement is not executed even when it is left for a long time in a liquid such as milk, etc., an excellent distribution state is held and also mixture is executed with a high density by improving distribution stability in the liquid. SOLUTION: The food additive is the one with excellent distribution stability in the liquid, which is constituted of needle-shaped or columnar inorganic matter and it is favorable that the inorganic matter are provided with 0.5-100 [mu]m long diameter and 0.01-5.0 [mu]m short diameter and more than 4.0 aspect ratio. The inorganic matter are also preferable to be a calcium carbonate. Preferably calcium carbonate consists of aragonite crystal.; Preferably, the BET specific surface area of the needle-shaped or columnar inorganic matter is 2.5-50 cm<2> /g and the inorganic matter is a composite combined with an organic food additive.



JPH07196317
PRODUCTION OF PRECIPITATED CALCIUM CARBONATE LIGHT

PURPOSE:To improve a content of roundheaded aragonite type by introducing a mixed gas of a carbon dioxide gas and air into a milk of lime of quick lime or slaked lime under a specific reaction condition. CONSTITUTION:Limestone containing 0.5-1wt.% magnesium oxide is baked and staked with water to give a milk of lime of quick lime or slaked lime having 7-20wt.% slaked lime concentration. Air mixed with 20-30vol.% carbon dioxide gas is introduced at 1,000-4000ml/minute to 800-2,000ml of the milk of lime while maintaining the milk of lime at 30-40p deg.C to carry out carbonation reaction and the reaction is completed at a reaction finishing point to rapidly drop electric conductivity of the milk of lime and to show the minimum value. Consequently, a precipitated calcium carbonate light rich in aragonite type as roundheaded aggregate crystal is obtained.



JPH09164050
PILLOW

PROBLEM TO BE SOLVED: To improve the heat radiating property and moisture dissipating property of the portion of a pillow filled with a filler in a bag body to be kept in contact with the head. SOLUTION: All or part of a filler is made of baked granular coral. The aragonite coral is the stone containing much calcium and easily absorbs heat, and it has a high heat radiating property because many fine cavities are formed inside. When the humidity of a pillow is increased as a result of the perspiration of the head, sweat is diffused via the fine cavities of the coral, and a sufficient moisture dissipating property is obtained.



JPH02302317
PREPARATION OF ARAGONITE CALCIUM CARBONATE

PURPOSE:To simply prepare pure aragonite CaCO3 suitable for paper coating agents, etc., by adding a divalent or trivalent metal salt to the aqueous suspension of variable calcium carbonate and thermally treating the suspension to cause a crystal transition reaction. CONSTITUTION:Vaterite calcium carbonate is prepared by a method in which carbon dioxide is introduced to an emulsion containing calcium hydroxide and calcium acetate. The vaterite calcium carbonate aqueous emulsion is mixed with a divalent or trivalent metal salt (e.g. magnesium hydroxide or chromium chloride) and subsequently heated at a temperature of >=40 deg.C to transfer the crystal of the vaterite calcium carbonate into the crystal of aragonite calcium carbonate. The produced aragonite calcium carbonate is filtered and washed with methanol to provide the pure calcium carbonate.



JPH04171087
WATER TREATING DEVICE USING ARAGONITE STONE

PURPOSE:To completely purify the beverage containing the microorganisms harmful to the human body at low costs by providing an ion producing means, an aragonite water treating means, a granular active carbon water treating means and a long life filter water treating means. CONSTITUTION:An ion producing means 300 activates water quality and removes harmful components such as residual chlorine. An aragonite water treating means 400 removes further the residual chlorine to change the acidic water into the alkaline water. A granular active carbon water treating means 500 removes bleaching powder and the trihalomethane being a carcinogen to reduce the residual chlorine in the water to at most 0.1ppm, thereby protecting a long life filter water treating means 100. In this means 100, since a filter chamber 10 having a water inlet 11 and a water outlet 12 is divided by a filter 20 into an upstream and a downstream side, the water is filtered to remove various bacteria and suspended matter therefrom. An aeration means 30 is also provided on the downstream side of the aforesaid filter chamber 10 in order for the filter to be prevented from clogging by backwashing operation.



JPH04150990
MANUAL DRINKING WATER PURIFYING APPARATUS

PURPOSE:To ensure drinking water of good quality even from the water of rivers when no drinking water of good quality is ensured from water of bad quality in an out-of-the-way place by an earthquake or the like by arranging an aragonite type granular calcium carbonate means, a chemical forming fiber filter means, a manual aeration means and a manual discharge means. CONSTITUTION:An aragonite type granular calcium carbonate means 4 can improve the quality of water which necessarily becomes pH 4 or less at the time of emergency due to an earthquake, especially, in an out-of-the way place so as to keep pH6-8. A chemical forming fiber filter means 5 perfectly remove E. coli, a staphylococcus or a streptococcus by pore partition of synthesis maintenance. A manual aeration means 6 is provided on the downstream side of the chemical forming fiber filter 5 and composed of a bellows-like member and, when the clogging of the chemical forming fiber filter 5 is generated, air is allowed to flow backward to discharge water contaminated with various bacteria from a cock 5a. A manual discharge means 7 uses only gravity to operate all of the above mentioned means.



JPH04144912
PRODUCTION OF IONIZABLE CALCIUM CARBONATE POWDER AND CRYSTAL

PURPOSE:To obtain powder and crystal of ionizable calcium carbonate with a simple apparatus using an energy-saving method by stirring ultrafine powder of super-activated aragonite-type calcium carbonate in distilled water under high pressure and distilling out the distilled water containing calcium carbonate in vacuum. CONSTITUTION:Ultrafine powder of super-activated aragonite-type calcium carbonate (500-3,000 mesh, preferably 1,000-2,000 mesh) is added to distilled water and dissociated to calcium ion and carbonate ion by stirring under 10-200atm, preferably 10-50atm. The distilled water containing large amount of the dissociated calcium carbonate is evaporated by vacuum distillation to obtain the objective ionizable calcium carbonate powder and crystal effective for the treatment of diabetes.



JPH04145961
DEVICE FOR MANUFACTURING SUPER-ACTIVATED CALCIUM CARBONATE SUPERFINE PARTICLE

PURPOSE:To pulverize the aragonite based calcium carbonate lump into superfine particles by providing a circular tube, an inlet door of feeding the aragonite based calcium carbonate slump provided on this circular tube and the inlet and outlet of N2 provided on this circular tube and N2 running means to executes running force to the relevant aragonite based calcium carbonate lump so as to rotate in this tube therein. CONSTITUTION:The aragonite based calcium carbonate lump is charged into the relevant tube from charging door 2. Inlet and outlet of gaseous nitrogen 3 are provided on the circular tube and N2 is charged into the tube 1. The running means 4 of the aragonite based calcium carbonate imparts running power so as to the aragonite base calcium carbonate lump is rotated in this tube 1. Since by the rotation of gaseous nitrogen the pulverization afford at low temp. and also by the friction between the particles themselves the lump goes to superfine particles, the superfine particles are manufactured without loosing the specific properties of the aragonite based calcium carbonate.



JPH04104885
ARAGONITE WATER TREATMENT MEANS AND WATER TREATMENT EQUIPMENT USING ARAGONITE WATER TREATMENT MEANS

PURPOSE:To improve acidity and to treat water into water of good quality by providing a mesh of 5-30mum mesh to the position between aragonite pieces and a water outlet. CONSTITUTION:A housing 10 of an aragonite water treatment means 100 has a water inlet 11 through which untreated water (including imperfectly treated water) is introduced and a water outlet 12 through which treated water is discharged. Many aragonite grains 14 partitioned off by meshes 13 of 5-30mum mesh are inserted into the above housing 10. When water is passed through this housing, this water can be alkalized.



JPS5836924 / JPH0134930
GROWING METHOD FOR CRYSTAL OF ARAGONITE TYPE PRISMATIC CALCIUM CARBONATE

PURPOSE:To grow crystals of aragonite type prismatic CaCO3 suitable for use as a coating pigment for paper making by reacting Ca(OH)2 with CO2 under specified conditions using seed crystals of aragonite type prismatic CaCO3. CONSTITUTION:A slurry of seed crystals of aragonite type CaCO3 having <=about 2mum major axis size and <=about 0.2mum minor axis size is mixed with a Ca(OH)2 emulsion so as to make the molar ratio of Ca(OH)2/CaCO3 1-5, and the concn. after the mixing is adjusted to 50-250g/l. While stirring this slurry, a gas contg. >=about 10vol% CO2 is blown into the slurry at a rate adjusting the amount of CO2 in the gas to 0.5-10Nl/min per 1kg CaCO3, and they are reacted at about 5-80 deg.C to grow crystals of aragonite type prismatic CaCO3. The resulting CaCO3 crystals are suitable for use in a field of the paper making industry and can enhance printing luster, printing strength, etc.



JPH04321515 / JP2787622
PRODUCTION OF ARAGONITE CRYSTAL CALCIUM CARBONATE HAVING LARGE GRAIN DIAMETER OF NEEDLELIKE SHAPE

PURPOSE:To efficiently obtain the subject highly dispersible crystal by dropping an aqueous slurry of Ca(OH)2 containing phosphoric acid (compound) into an aqueous slurry of aragonite crystal calcium carbonate of a needlelike shape and carbonating the resultant mixture solution under specific conditions. CONSTITUTION:An aqueous slurry of Ca(OH)2 containing at least one selected from phosphoric acid and soluble phosphoric acid compounds (e.g. K3PO4) is dropped onto an aqueous slurry of aragonite crystal calcium carbonate of a needlelike shape. The concentration of the aqueous slurry of Ca(OH)2 is preferably about 20-250 g/l. The mixture slurry is then regulated to 30-80 deg.C temperature and pH >=10 and CO2 is introduced to carry out carbonation.; Thereby, the objective highly dispersible aragonite crystal calcium carbonate having a needlelike shape and a large grain diameter is obtained. The resultant aragonite crystal calcium carbonate as a reinforcing material can be blended with plastics, etc., to remarkably improve especially flexural elastic modulus.



JPS63260815
PRODUCTION OF CALCIUM CARBONATE HAVING ARAGONITE CRYSTAL FORM

PURPOSE:To enable efficiency industrial production of calcium carbonate having aragonite crystal form, by blowing CO2 gas into an aqueous slurry of Ca(OH)2 under specific condition. CONSTITUTION:Calcium carbonate is produced by blowing CO2 gas into an aqueous slurry of Ca(OH)2 under the following reaction condition. The concentration and temperature of the aqueous slurry of Ca(OH)2 are adjusted to 5-40wt.% and 5-60 deg.C, respectively, and the slurry is added with an additive and carbonated by introducing CO2 gas at a rate of <=4l/min/kg.Ca(OH)2 (in terms of 100% CO2). The additive is e.g. phosphoric acid, phosphoric acid compound, barium compound and strontium compound. The amount of the additive is preferably 0.2-6.0wt.% based on the calcium hydroxide and the CO2 concentration of the CO2 gas is preferably 10-40%.



JPS61254162
CALCIUM-CONTAINING HEALTH FOOD

PURPOSE:To promote the absorption and utilization of calcium, by compounding aragonite-type calcium carbonate, lactose, vitamin D and amino acid to a food. CONSTITUTION:The objective food contains aragonite-type calcium carbonate, lactose, vitamin D and at least one kind of amino acid. The amino acid is preferably lysine and/or arginine. The ratios and daily doses of the above components are preferably 100-500mg of aragonite-type calcium carbonate, 100-500mg of lactose, 100-400 IU of vitamin D, 0.5-10mg of lysine and 0.5-10mg of arginine.



JPS63256514 / JP2556699
PRODUCTION OF CALCIUM CARBONATE HAVING ARAGONITE TYPE CRYSTAL FORM

PURPOSE:To produce easily aragonite type calcium carbonate having superior dispersibility by introducing gaseous CO2 into aq. slurry of Ca(OH)2 having a specified concn., temp., and content of soluble phosphate. CONSTITUTION:0.1-20wt.% [basing on the amt. of Ca(OH)2] soluble phosphate (e.g. H3PO4, Na2HPO4) expressed in terms of tervalent PO4<3-> is added to aq. slurry of Ca(OH)2 having 5-40wt.% concn. at 5-45 deg.C. A carbonation reaction is caused by introducing gaseous CO2 into the slurry to obtain thus aragonite type calcium carbonate. The obtd. aragonite type calcium carbonate is used pref. as a filler or coating material, etc. for paper, providing filled paper having high brightness, opacity, size value of paper and pigmented paper, etc.



JPH04295010 / JP2706384
PRODUCTION OF ARAGONITE COLUMNER CALCIUM CARBONATE

PURPOSE:To offer the production method of aragonite calcium carbonate having a proper particle diameter and uniform particle diameter, excellent in whiteness and strength, excellent in printing property such as gloss of white paper, print gloss, printing strength, absorption of ink, setting property, etc., when used for paper, for example, as a coating pigment for paper manufacturing, and showing high opaqueness as an additive filler and excellent mechanical strength as a filler for plastics. CONSTITUTION:A water-base suspension of calcium hydroxide having >=1000cp viscosity at 25 deg.C and 400g/l concn. is adjusted to have 50-400g/l concn., to which a carbon dioxide-contg. gas containing 15-100vol.% carbon dioxide is added by 1-3l/min. in terms of carbon dioxide to 1kg of calcium hydroxide. Thus, the aragonite columner calcium carbonate is obtd.



JP2000272919
PRODUCTION OF ARAGONITE NEEDLE CRYSTALLINE CALCIUM CARBONATE

PROBLEM TO BE SOLVED: To provide a production process for needle calcium carbonate of high quality that is suitable for coated paper. SOLUTION: A carbon dioxide-containing gas is blown into an aqueous suspension of calcium hydroxide as a main component to effect the carbonation reaction to produce needle calcium carbonate. In this process, a certain amount of needle calcium carbonate is added to the aqueous suspension and the carbonation reaction is carried out, while they are stirred with a power of >=0.25 w/m3 as a PV value per the unit volume.



WO0166467
PRECIPITATED ARAGONITE AND A PROCESS FOR PRODUCING IT

Disclosed is a novel form of particulate precipitated aragonite, and a novel process for producing it.



GB2360034  
Precipitating aragonite calcium carbonate

 process for producing a particulate precipitated aragonite calcium carbonate, comprises reacting an aqueous calcium hydroxide slurry with a carbon dioxide or a gas containing it, wherein the parameters of said process, including at least one preselected active agent, mode of operation, operating concentrations of raw materials, operating temperature, operating mixer speed and operating pH, are such that (A) the specific gravity of the product after drying for 12 hours at 120{C is <2.5 g/cm<SP>3</SP>; and (B) the specific gravity of this dry product after ignition for eight hours at 500{C is <2.5 g/cm<SP>3</SP>. The active agent may be carboxylic acid of the formula CH<SB>3</SB>(CH<SB>2</SB>)<SB>n</SB> COOH where n = 7-10 or a salt, anhydride ester or acyl halide thereof or a ketene CH<SB>3</SB>(CH<SB>2</SB>)<SB>n</SB> C=C=O (n=7-10).



FR2600246
REPLACEMENT TOOTH ROOT

Device intended to replace immediately or with a delay any natural tooth root as well as any loss of alveolo-radicular substance. It is embodied by a pivot made of calcium carbonate (aragonite-calcite) which is very hard, presents a very low porosity, has a slightly cylindroconical diameter and a variable length and has a well (2) drilled in its center of which the external face presents throughout its height a helical protuberance (1) forming a Z-shaped structure. Its upper extremity presents a shoulder (3) throughout its perimeter, its lower extremity has the configuration of a dihedron (4). Two vertical symmetric grooves (5) are dug on its external face up to half of its height. The device according to the invention is intended for the replacement of lost natural dental roots in odonto-stomatology.



FR2044901
Prep of the aragonite form of CaCO3 as large sized crystals

ragonite containing a major proportion of crystals visible under the optical microscope is prepared by (a) removing crystal poisons from saccharose, (b) dissolving calcium hydroxide in an aqueous solution of the saccharose, (c) reacting this soln. with CO2 at an elevated temp., and (d) separating the precipitated aragonite.



FR2880277
Composition useful e.g. for treating hair cracking and lesions of skin... mollusc aragonite biocrystals

Composition for equids, bovids and other domestic animals, comprises an active ingredient comprising soluble and insoluble biopolymers of marine origin, and mollusc aragonite biocrystals. Independent claims are also included for: (1) an orthopedic composition (I) for treating hair cracking and cracks, comprising calcium hydroxide and adragante gum; (2) a composition (II) for treating hair lesions and skin in horses, comprising excipients, vegetable fat content (obtained from shea tree, corn seed oil, onager oil or Rosa rubiginosa) and a aromatic extract mixture (obtained from Helychrisum italicum, Inula helenium, Lavandula latifolia spica, Salvia officinalis or Citrus aurantium); (3) a composition (III) comprising calcium hydroxide, allantoin, copper acetate and P-cresol; (4) a composition (IV) useful for the daily care of hoof and its appendices, comprising the excipients and the aromatic extract; (5) a composition (V) for the treatment of dysfunctions of the principal pad in the growth of the horn of the hoof in horses, comprising vitamins and a mixture of aromatic extract; (6) a composition (VI) for the recovery and the cooling of the tendons after work in horses, comprising terpenic compounds; (7) a composition (VII) for the treatment of the dry scale and summer dermite comprising excipients and aromatic extracts; (8) a composition (VIII) for the treatment of breakdowns and damage of flexor muscles in horses, comprising components (acting on the muscular or articular pains) and essential oils; and (9) a composition (IX) for treating rotting of hoof plates in horses, comprising various excipients and healing substances.



DE19846829
Impurities expelled from sugar juice by exposure to electrical or magnetic field driving out aragonite calcium for colorless product

n the production of crystalline sugar, the juice is mixed with milk of lime and subjected to a two-stage carbonation process. In the first stage, the introduction of CO2 drives partial crystallisation of the dissolved chalk to calcite, which binds the coagulated inorganic and organic non-sugar substances in the sugar juice. The juice is especially exposed externally to an electric or magnetic field which crystallizes the calcium carbonate. In the production of crystalline sugar from concentrated cane or beet juice, the juice is mixed with milk of lime and subjected to a two-stage carbonation process. In the first stage, the introduction of CO2 drives partial crystallisation of the dissolved chalk to calcite, which binds the coagulated inorganic and organic non-sugar substances in the sugar juice. The resulting crystal residues are removed by filtration. The juice is then especially exposed externally to an electric or magnetic field which crystallizes the calcium carbonate in the form of aragonite. The resulting sugar juice is then surrendered to a second stage in which the residual calcium is crystallized and removed by filtration.



DE19541735
Use of hydrothermal rock deposits e.g. calcite precursors

Use of hydrothermal rock deposits is claimed, to improve the light quantum resonance effect in the body by molecular disperse division. The rock deposits are present in healing, thermal, brine, mud, sulphur and mineral deposits, completely returned to molecular dispersion, completely homogenised with noble crystals, plant and animal materials as colloidal compounds, for better control of biophoton radiation through nanocrystals, between natural inorganic and natural organic materials. The rock deposits provide precursors of calcite, aragonite, dolomite, marble, zinc blende, smithsonite, wurzite, manganite, hausmannite, neptunite, hornblende, calaverite, stephanite, hessite, krennerite, chalcosine, bornite, linnaeite, magnetic pyrites, carrolite, ilmenite, ullmannite, marcasite, klinozoisite, pyrophylite, nacrite, aukerite, rhodochrosite, kutnahorite, epistilbite, heulandite, fluorspar, basnaesite, creedite, synchisite, tunisite, chalbasite, graphite, coal, apophylite, sellaite, karpholite, brookite, potassium feldspar, plagioclase, aoebite, vesuvian, elbaite, dravite, schorl, buergerite, tsilaisite, uvite, liddicoatite, siderite, hot springs deposit, hydrocarbonate, calcium carbonate, sulphate, free carbonic acid, dissolved oxygen, metasilicic acid, metaboric acid, titanic acid, succinic acid, benzoic acid, sulphur, brine, traces of iron, chromium, titanium, aluminium, gold, silver, platinum, selenium, molybdenum, ammonium, calcium, lithium, sodium, chlorite, iodide, fluorine, bromine, thermal salts, potassium, magnesium, cobalt, zinc, meerschaum (sepiolite), tartar and similar or different inorganic materials. Also claimed are compositions with volatile, liquid, viscous, waxy, pulverised or solid, skin-tolerated, natural or allergologically (sic) tolerable carriers.



CN1641077 / CN1303264
Method for preparing aragonite type calcium carbonate whisker

The present invention relates to the preparation process of high purity aragonite type calcium carbonate whisker. The present invention prepares aragonite type calcium carbonate whisker with lime or slaked lime as main material and magnesium salt as crystal salt controlling agent and through a CO2 carbonating process. The process features the repeated use of the magnesium salt solution and the homogeneous replenishment of lime slurry during carbonating reaction. The process has low production cost, less environmental pollution and high calcium carbonate whisker yield, and the prepared calcium carbonate whisker has high purity and high length/diameter ratio. The process is suitable for industrial production of calcium carbonate whisker.



Abstract not available

CA877210
MANUFACTURE OF ARAGONITE

CA697098
PRODUCTiON OF CALCIUM CARBONATE IN THE ARAGONITE CRYSTAL FORM

KR950001787
METHOD OF PREPARING ARAGONITE FORM OF CACO3

KR950001788
METHOD OF PREPARAING ARAGONITE FORM OF CACO3

KR100561230
MANUFACTURING METHOD OF ARAGONITE PRECIPITATED CALCIUM CARBONATE....

US3669620
MANUFACTURE OF ARAGONITE

JPS5450499 / JPS5551852
METHOD OF MANUFACTURING ARAGONITE COLUMNAR CALCIUM CARBONATE