xb```e``z?30EY8&@J}7iYXx`x"YQL 7 }*'}@b<5@Z.wH3q@ 9( According to the invention there is provided a method for producing precipitated calcium carbonate by reacting an aqueous solution of calcium nitrate [Ca(NO. Abstracts., 116:26, 178, abstract No. Download : Download high-res image (73KB)Download : Download full-size image. 0000007212 00000 n doi: Various kinds of clay minerals mixed with calcium carbonate and ammonium chloride were heated at a specific temperature in the range of 500-1000 C. for one hour, and the reaction products were examined. xref
92 17
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The various aspects of the invention will now be illustrated with reference to the accompanying examples: It will be appreciated that the ammonium carbonate solution may in the alternative have been prepared by feeding ammonia gas from another source with CO, The stock solutions prepared as described above were fed by means of constant displacement pumps at various pressures into an elongated reaction chamber of about 5 m in length. senses. Smaller particles of vaterite were produced in the monoethanolamine solution and of calcite in the triethylamine solution. Application filed by Pretoria Portland Cement Co Ltd, Assigned to GOMERSALL, JOHN EDWARD, PRETORIA PORTLAND CEMENT COMPANY LIMITED. 
and transmitted securely. Effect of sulfate on calcium and magnesium homeostasis following urinary diversion. 0000001320 00000 n
Most questions answered within 4 hours. All precipitated calcium carbonate particles had monomodal particle size distributions. Our collective professional experience demonstrates skills that are broadly transferable. Calcium carbonate was precipitated from calcium chloride solution via carbonation. The characteristics of CaCO3 depended on used CO2 absorption promoters. This invention relates to methods for producing crystalline materials by precipitation. NH4+ is always a soluble ion, CO32- are only soluble with Group I metals, aluminum, and ammonium. Hydrogen in ammonium ions released from ammonium chloride may play an important role in the formation of hydrogarnet. sharing sensitive information, make sure youre on a federal Epub 2005 Mar 3. 1987 Sep;117(9):1603-8. doi: 10.1093/jn/117.9.1603. HtVMkFtU]U
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J$Q6X$.{Wsm It is an object of the present invention to provide a new method for producing precipitated calcium carbonate from a natural source material containing calcium values. And in a time when the need exists to resonate across all, simply Press Play; you'll never be at a loss for what to say. 
10. When calcium carbonate alone was used, the crystallization temperatures usually rose higher than those in the case when both ammonium chloride and calcium carbonate were used, the kinds of reaction products differed, particularly in clay minerals rich in aluminum; gehlenite was noticed as one of the principal reaction products. In FIG. According to one aspect of the invention it relates to the production of precipitated calcium carbonate. 6. No packages or subscriptions, pay only for the time you need.
An official website of the United States government. When either sulfate or chloride is added to the diet, the resulting acid load causes a rise in urinary calcium excretion. endstream
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HJZa\}Yid>V]zRgG>m-B2)e9s9no(t"]uyt9E,]z- isN~=GIW9to 1. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). EP-A-49666 [Kalk Chemische Fabrik] teaches the preparation of calcium carbonate [vaterite] by reaction of a calcium ion containing aqueous solution with carbonate ions containing aqueous solution. FOIA 
This site needs JavaScript to work properly. The method of claim 11, wherein the ammonia gas for step (iv) is derived from the step in (iii) above, in which the solids-free solution is heated. Accessibility In a second experiment, the amounts of supplemental sulfate and chloride were adjusted so that total absorptions were similar. Relative importance of urinary sulfate and net acid excretion as determinants of calciuria in normal subjects. 0000003208 00000 n
zq+wHP:&'-,2kU"W*OPue i5mNqSN{hZp Z1J1, So cancel like terms and get the net ionic equation: 2005 - 2022 Wyzant, Inc, a division of IXL Learning - All Rights Reserved |, Drawing Cyclohexane Rings Organic Chemistry.
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As expected, the chloride and sulfate diets were both associated with significantly elevated urine calcium and net acid excretion as compared with controls.
ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAMSAY, JAMES IAN;REEL/FRAME:010250/0982, PRETORIA PORTLAND CEMENT COMPANY LIMITED, SOUTH AF, PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, Manufacture of Magnesium Oxide and Calcium Carbonate, Filler for the manufacture of base paper and method for the manufacture of base paper, Process for sequestering carbon dioxide and sulfur dioxide, Methods and apparatus for producing precipitated calcium carbonate, High purity medicinal calcium carboante and its producing method, Diagnostics for Serial Communication Busses, Methods and compositions using calcium carbonate, Cement and concrete with reinforced material, Calcium supplement having enhanced absorption, Use of multiple beam spot sizes for obtaining improved performance in optical additive manufacturing techniques, Method for producing cathode coating compositions, Process for the production of ammonium nitrate and calcium carbonate, Process for the preparation of very pure calcium carbonate powder, Production of precipitated calcium carbonate, The production method of magnesium oxide and lime carbonate, Production of high purity precipitated calcium carbonate, Manufacture of precipitated calcium carbonate, Process for simultaneous production of potassium sulphate, ammonium sulfate, magnesium hydroxide and/or magnesium oxide from kainite mixed salt and ammonia, Liquid carbon dioxide injection in exothermic chemical reactions, Process for obtaining precipitated calcium carbonate, Manufacture of precipitated calcium carbonate of improved color and stable crystalline form, Process for producing high grade hydromagnesite and magnesium oxide, Process for producing highly pure magnesium hydroxide, Co-production method of calcium carbonate and sodium hydroxide, Process for the production of crystalline calcium carbonate of vaterite type, Process for production of magnesium hydroxide and calcium chloride, Process for rapid conversion of fluoroanhydrite to gypsum, Apparatus and Methods For Producing Calcium Chloride, and Compositions and Products Made Therefrom, Manufacturing method of calcium carbonate, Manufacture of precipitated calcium carbonate of improved colour, Lapse for failure to pay maintenance fees, Lapsed due to failure to pay maintenance fee, Information on status: patent discontinuation. The method of claim 5, wherein the ammonia gas for step (iv) is derived from the step in (iii) above, in which the solids-free solution is heated.
0000000016 00000 n 0000001443 00000 n Choose an expert and meet online. The precipitation reaction between the two reagent solutions which react to form the precipitated CaCO. Through Press Play, companies have an opportunity to massage customers?? BQf;zm7 3gSg}sa eeuo. Effect of dietary anion composition on acid-induced hypercalciuria in the adult rat. 0000005620 00000 n 8. 0000000636 00000 n It will be seen that the product of the method of the invention displays a sharper gaussian distribution of crystal sizes than the commercial product. Graph B represents the same for a precipitated calcium carbonate produced by the method of the invention at 50 C. and 3 bar pressure. The method of claim 4, wherein the particle size and size distribution is controlled by the use of pressure between 1 and 5 bar gauge pressure. However, those fed sulfate exhibited significantly less calcium and acid excretion and absorbed a smaller proportion of the anion load than those given chloride. Kidney Int.
Despite the natural abundance of calcium carbonate as such pure calcium carbonate is a relatively expensive product due to the difficulties and expenses associated with conventional purification methods. 2017 Elsevier B.V. All rights reserved. A link to the app was sent to your phone. is soluble except with certain metals like silver, lead, and mercury. trailer The method of claim 10, wherein a 20 percent (by mass) solution of calcium nitrate is reacted with a stoichiometric equivalent quantity of ammonium carbonate to produce calcium carbonate crystals having a d. 12. +ONE turns Insight into Advantage. In these aqueous species, they typically form ions in solution except when forming a precipitate. Since there are aqueous solutions of Calcium chloride and ammonium carbonate combined, the state we need to put in the chemical equation is (aq) for each. Fast CO2 absorption in NH3 or MEA solutions favored vaterite formation. GOMERSALL, JOHN EDWARD, SOUTH AFRICA, Free format text: HHS Vulnerability Disclosure, Help 92 0 obj <> endobj If one bears in mind that the process by which the product of this purity is achieved starts from very impure CaO, this achievement is remarkable. https://patents.darts-ip.com/?family=25584884&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US6036933(A). Zou et al., Manufacture of Magnesium Oxide and Calcium Carbonate , Chem. Federal government websites often end in .gov or .mil. from 1-100 micrometer, Particles consisting of a mixture of two or more inorganic phases, "" .50- . 0000000986 00000 n 0000006416 00000 n Clipboard, Search History, and several other advanced features are temporarily unavailable. Preferred are the use of a solution containing calcium nitrate and a solution of ammonium carbonate. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAMSAY, JAMES IAN;REEL/FRAME:010250/0982, Owner name: Therefore, we can write the ionic equation. Consumption of a high calcium mineral water lowers biochemical indices of bone remodeling in postmenopausal women with low calcium intake. According to that invention, the process from the slaking of the lime up to the separation of the white liquor and the lime sludge is carried out at a pressure above the atmospheric pressure. NCI CPTC Antibody Characterization Program. startxref A possible synergism of dietary phosphate and urine-acidifying salts in preventing silica urolithiasis in a rat model. Ammonium salts of sulfate, chloride, and carbonate (control) were added to the diets of male rats at 0.3 mequiv./g weight of diet. So cancel like terms and get the net ionic equation: Get a free answer to a quick problem. 8600 Rockville Pike J Nutr. The precipitation of calcium carbonate was carried out by passing a gaseous mixture of carbon dioxide and air into a calcium chloride solution. The site is secure. ScienceDirect is a registered trademark of Elsevier B.V. ScienceDirect is a registered trademark of Elsevier B.V.
It will be seen that changes in reaction pressure affects particle size and distribution specifically, pressure above zero bar reduces particle size and narrows distribution. "Global patent litigation dataset by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License. a Question And with a solid scientific background influencing our approach, these skills, together with our ability to work with and through people, translate into a broad range of capabilities within a wide array of applications. [c] Influence of Concentration of Feed Solutions, It has been found that increased concentration from 20% Ca(NO, The purity of the product produced by the method as described in Example 1[a] and [b] is extremely high and is in many respects comparable with the industry spectrographic standard for CaCO, From the above table it will be seen that the product of the invention contains only 61% of the quantity of SiO. Tectonics, Climate, and Landscape Evolution, This site uses cookies. The selected compounds enhancing carbon dioxide absorption were used as additives which promote the formation of carbonate ions in the solution. The method of claim 3, wherein the ammonia gas for step (iv) is derived from the step in (iii) above, in which the solids-free solution is heated.
The .gov means its official. The method of claim 10, wherein the ammonia gas for step (iv) is derived from the step in (iii) above, in which the solids-free solution is heated. 
5. With knowledge and practice across the varied spectrum of commerce, our entrepreneurial spirit, aptitude coupled with a deep commitment to results are what sets us apart. Owner name: 2005 Oct;16(10):1203-9. doi: 10.1007/s00198-004-1828-6. Would you like email updates of new search results? Meunier PJ, Jenvrin C, Munoz F, de la Gueronnire V, Garnero P, Menz M. Osteoporos Int. The method of claim 4, wherein the ammonia gas for step (iv) is derived from the step in (iii) above, in which the solids-free solution is heated.
There is, however, the possibility that sulfate, which has been shown to complex renal tubular calcium, will further decrease renal calcium reabsorption and thus produce a greater calciuria than chloride. Support. Such concentration control for influencing crystal size may of course be combined with reaction pressure control as described above. . lime] by impregnation of the calcination product with ammonium nitrate solution. PRETORIA PORTLAND CEMENT COMPANY LIMITED, SOUTH AF, Free format text: Dmitrievskii et al., Manufacture of Calcium Carbonate Chem. 9. The invention thus relates particularly, but not exclusively, to the production of high purity calcium carbonate from relatively impure calcium source material. The method of claim 4, wherein the particle size and size distribution of the calcium carbonate produced by the process is controlled by controlling the concentration(s) of one or both of the solutions mixed in step (v) of the method. answered 07/24/20. Thus, in chronic feeding trials, there appears to be no measurable difference in the calciuretic properties of sulfate and chloride anions. Calcium carbonate particles were precipitated as calcite in triethylamine or triethanolamine solutions, while the rate of carbon dioxide mass transfer from gas to liquid phase was much slower. In raw impure form these products are used in various industries including the mining and cement industries. Answers. In one embodiment of this aspect of the invention it has been found that by reacting 20% [by mass] solution of Ca(NO. Solid calcium carbonate is formed, meaning it is called a precipitate. In a preferred embodiment, the process is also carried out at a temperature above the normal boiling temperature of the system. Disclaimer, National Library of Medicine The method of claim 1, wherein the calcium nitrate and the ammonium carbonate are fed into intimate contact with one another in a contact zone of a reactor, and the mixture is immediately displaced from the contact zone, and wherein the resultant crystalline reaction product is allowed to precipitate from the ammonium nitrate-rich mother liquor and the precipitated crystals are thereafter separated from said mother liquor. [iii] the ammonium nitrate used is derived from the precipitation phase during which calcium carbonate is precipitated from the mother liquor containing ammonium nitrate. This equation is balanced as there are the same quantity of atoms in both sides of equation. Advice. You do not have access to this content, please speak to your institutional administrator if you feel you should have access. J Nutr. MeSH 0000002412 00000 n
are only soluble with Group I metals, aluminum, and ammonium. 
Twenty-four hour excretion rates of calcium, sulfate, chloride, and net acid were measured at various intervals up to 1 month. Cl- is soluble except with certain metals like silver, lead, and mercury. The resultant calcium nitrate solution is used for the preparation of calcium carbonate by carbonisation with CO. WO-A-7900931 [Anderson] discloses a process for the preparation of white liquor for the sulphate pulping process, wherein quicklime is slaked with green liquor and the slaked lime formed is reacted with the sodium carbonate in the green liquor to sodium hydroxide in a causticizing process, the lime sludge formed being separated. The method of claim 1, wherein the ammonia gas for step (iv) is derived from the step in (iii) above, in which the solids-free solution is heated.