Chemical Abstracts, AN: 116:258510H of CN-A-1055718 [Zou et al] discloses the preparation of calcium nitrate from calcined [dolomite] ores [i.e. With clay minerals rich in magnesium, crystallization of such minerals as periclase, forsterite, monticellite, spurrite, etc., was observed. 0000008117 00000 n Calcium, magnesium and phosphorus utilization by rats fed sodium and potassium salts of various inorganic anions. The precipitation of calcium carbonate was carried out by passing a gaseous mixture of carbon dioxide and air into a calcium chloride solution. 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. Effect of sulfate on calcium and magnesium homeostasis following urinary diversion. 1989 Jan;35(1):105-15. doi: 10.1038/ki.1989.15. 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. We use cookies to help provide and enhance our service and tailor content and ads. Careers. For clay minerals containing both aluminum and magnesium, such minerals as periclase, forsterite, hydrogrossularite, and monticellite were formed. Bookshelf No packages or subscriptions, pay only for the time you need. %%EOF When either sulfate or chloride is added to the diet, the resulting acid load causes a rise in urinary calcium excretion. 1986 Mar;116(3):388-94. doi: 10.1093/jn/116.3.388. For Free. Such concentration control for influencing crystal size may of course be combined with reaction pressure control as described above. Support. BQf;zm7 3gSg}sa eeuo. From identification to implementation, Play Projects is the ideal partner to plan, manage and/or execute your projects. 2005 Oct;16(10):1203-9. doi: 10.1007/s00198-004-1828-6. GOMERSALL, JOHN EDWARD, SOUTH AFRICA, Free format text: Tectonics, Climate, and Landscape Evolution, This site uses cookies. 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. 0000001111 00000 n The site is secure. Bethesda, MD 20894, Web Policies PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, A method for producing precipitated calcium carbonate by reacting an aqueous solution of calcium nitrate [Ca(NO. Graph B represents the same for a precipitated calcium carbonate produced by the method of the invention at 50 C. and 3 bar pressure. 0000002412 00000 n Before Geological and Mineralogical Institute, Faculty of Science, Tokyo University of Education, Oisuka, Tokyo, Japan. As expected, the chloride and sulfate diets were both associated with significantly elevated urine calcium and net acid excretion as compared with controls. Calcium carbonate is a natural carbonate which is present in large quantities particularly in calcitic and dolomitic limestone. 1991 Sep;121(9):1382-8. doi: 10.1093/jn/121.9.1382. A possible synergism of dietary phosphate and urine-acidifying salts in preventing silica urolithiasis in a rat model. 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. 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. 0000005620 00000 n In one application of this aspect of the invention there is thus provided a method for selectively producing precipitated calcium carbonate crystals in which a preferred crystal size distribution predominates, the method comprising the steps of intimately contacting an aqueous solution of Ca(NO. [iii] the ammonium nitrate used is derived from the precipitation phase during which calcium carbonate is precipitated from the mother liquor containing ammonium nitrate. In a preferred embodiment, the process is also carried out at a temperature above the normal boiling temperature of the system. (vii) recycling the ammonium nitrate-rich mother liquor to step (i). 92 0 obj <> endobj The invention thus relates particularly, but not exclusively, to the production of high purity calcium carbonate from relatively impure calcium source material. Effect of dietary anion composition on acid-induced hypercalciuria in the adult rat. However, those fed sulfate exhibited significantly less calcium and acid excretion and absorbed a smaller proportion of the anion load than those given chloride. FOIA This equation is balanced as there are the same quantity of atoms in both sides of equation. You could not be signed in. First, write the chemical reaction for this situation: CaCl2(aq) + (NH4)2CO3(aq) ------->CaCO3(s) + 2NH4Cl (aq). 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. 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. Solid calcium carbonate is formed, meaning it is called a precipitate. Nim T. 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. 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. Clipboard, Search History, and several other advanced features are temporarily unavailable. xb```e``z?30EY8&@J}7iYXx`x"YQL 7 }*'}@b<5@Z.wH3q@ 9( %PDF-1.6 % Kidney Int. At Press Play we deliver intelligent solutions that simplify the process for businesses to stay in step with the dynamically changing technology landscape. lime] by impregnation of the calcination product with ammonium nitrate solution. 5. 0000001443 00000 n 1 Graph A represents the particle size distribution and composition ranges for a commercially available ground calcium carbonate. 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. senses. According to a further aspect of the present invention there is provided a method for producing precipitated calcium carbonate crystals of a selected crystal size comprising the steps of reacting an aqueous solution of calcium nitrate with an aqueous solution of ammonium carbonate and controlling the crystal size of the precipitated calcium carbonate by providing at least one of the reagent solutions at a concentration favouring the formation of the desired crystal size, allowing the resultant crystalline reaction product to precipitate from its mother liquor and separating the precipitated crystals from the mother liquor. Slower carbonation in the presence of TEtA or TEA resulted in calcite precipitation. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). The resulting calcium carbonate particles varied in polymorphic composition and the particle size depending on the used absorption promoter. 4. 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. 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. Ammonium salts of sulfate, chloride, and carbonate (control) were added to the diets of male rats at 0.3 mequiv./g weight of diet. 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. Unable to load your collection due to an error, Unable to load your delegates due to an error. Relative importance of urinary sulfate and net acid excretion as determinants of calciuria in normal subjects. Net ionic equation means that same ions located in both left and right of chemical equation get cancelled out. Equation: Ca2+(aq) + 2Cl-(aq) + CO32-(aq) + 2NH4+(aq) -------> CaCO3(s) + 2NH4+(aq) + 2Cl-(aq). from 1-100 micrometer, Particles consisting of a mixture of two or more inorganic phases, "" .50- . A link to the app was sent to your phone. An official website of the United States government. Advice. PRETORIA PORTLAND CEMENT COMPANY LIMITED, SOUTH AF, Free format text: 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. ScienceDirect is a registered trademark of Elsevier B.V. ScienceDirect is a registered trademark of Elsevier B.V. 1987 Sep;117(9):1603-8. doi: 10.1093/jn/117.9.1603. Meunier PJ, Jenvrin C, Munoz F, de la Gueronnire V, Garnero P, Menz M. Osteoporos Int. PMC In these aqueous species, they typically form ions in solution except when forming a precipitate. In the case of clay minerals rich in aluminum, formation of such minerals as hydrogrossularite, wollastonite, haiiyne, larnite, etc., was observed. 0000003990 00000 n The precipitation reaction between the two reagent solutions which react to form the precipitated CaCO. In purified crystalline form calcium carbonate is used in the production of paint, in toothpaste, paper coating and sizing and as an acid neutraliser or as a filler in pharmaceutical products, amongst other applications. 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. Our expertise is founded upon the core principles of learning, however, our promise to deliver is founded squarely upon our achievements. 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access. Copyright 2022 Elsevier B.V. or its licensors or contributors. Federal government websites often end in .gov or .mil. 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. According to the invention there is provided a method for producing precipitated calcium carbonate by reacting an aqueous solution of calcium nitrate [Ca(NO. 0000003208 00000 n and transmitted securely. J Nutr. Preferred are the use of a solution containing calcium nitrate and a solution of ammonium carbonate. "Global patent litigation dataset by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License. Thus, in chronic feeding trials, there appears to be no measurable difference in the calciuretic properties of sulfate and chloride anions. 0000000885 00000 n 0000025162 00000 n HJZa\}Yid>V]zRgG>m-B2)e9s9no(t"]uyt9E,]z- isN~=GIW9to 0 [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. Abstracts, 114:6, 175, abstract No., Feb. 45999w (1991). 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. Cl- is soluble except with certain metals like silver, lead, and mercury. 0000000636 00000 n So cancel like terms and get the net ionic equation: Get a free answer to a quick problem. In a second experiment, the amounts of supplemental sulfate and chloride were adjusted so that total absorptions were similar. Download : Download high-res image (73KB)Download : Download full-size image. American Mineralogist 1965;; 50 (7-8): 886899. 11. The .gov means its official. 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. Choose an expert and meet online. 0000001320 00000 n ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAMSAY, JAMES IAN;REEL/FRAME:010250/0982, Owner name: 9. 0000000986 00000 n In raw impure form these products are used in various industries including the mining and cement industries. 0000008027 00000 n 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. Would you like email updates of new search results? Smaller particles of vaterite were produced in the monoethanolamine solution and of calcite in the triethylamine solution. The influence of ammonia and selected amines on the characteristics of calcium carbonate precipitated from calcium chloride solutions via carbonation. 8. is soluble except with certain metals like silver, lead, and mercury. Most questions answered within 4 hours. https://doi.org/10.1016/j.matchemphys.2017.01.060. The method may be used to produce precipitated calcium carbonate which is predominantly of the vaterite crystalline form which has been found to be the default crystalline form when the temperature was kept between 15 C. and 75 C. The reaction is for this purpose most preferably carried out at between 34 C. and 40 C. With residence in slurry form the vaterite crystal form has been found to convert into calcite and is known in the art. 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. Please click on the PDF icon to access. Through Press Play, companies have an opportunity to massage customers?? The characteristics of CaCO3 depended on used CO2 absorption promoters. Accessibility trailer The method of claim 3, wherein the reagent solutions are introduced into a reactor which is in the form of an elongated tubular conduit. The tightening or narrowing effect of the present invention on particle size distribution is graphically illustrated in FIG. The method of claim 1, wherein step (v) is performed at a pressure of between 1 and 5 bar gauge pressure. sharing sensitive information, make sure youre on a federal Calcium carbonate was precipitated from calcium chloride solution via carbonation. 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. The kinds of reaction products depend upon the chemical compositions of the clay minerals. Answers. xref NCI CPTC Antibody Characterization Program. <<0E4AA439C5DC1240B2076B594E15DFE8>]>> 108 0 obj <>stream +ONE turns Insight into Advantage. HtVMkFtU]U Has2BKO^FXW4ow|||e||~~O//oeg?&=_|K@D%dnUJP5?M]YC?ZaI8A#E Z$QO$,U$Hl&k LHI9(@R2'`a?i%4yQ*V]UXV J$Q6X$.{Wsm 8600 Rockville Pike zq+wHP:&'-,2kU"W*OPue i5mNqSN{hZp Z1J1, 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. 1. The common ions are the. 0000007212 00000 n 258510h, Oct. 1991. 0000006416 00000 n J Nutr. https://patents.darts-ip.com/?family=25584884&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US6036933(A). 2017 Elsevier B.V. All rights reserved. 0000004772 00000 n government site. 1. J Nutr. Disclaimer, National Library of Medicine Zou et al., Manufacture of Magnesium Oxide and Calcium Carbonate , Chem. It has been found that the application of feed pressure in this range results in a decrease in crystal particle size. are only soluble with Group I metals, aluminum, and ammonium. It was found that the pressure in the reaction chamber, which was controlled by means of a valve at the outlet end thereof, had a marked influence on the size of the crystals of CaCO. 6. At 2 weeks, both calcium and acid excretions in the fixed anion groups were no longer significantly different. In a preferred form of the invention the reagent solutions are introduced into a reactor arrangement which is in the form of an elongated tubular conduit into which the reagent solutions are fed under a pressure of between 1 and 5 bar gauge pressure. According to one aspect of the invention it relates to the production of precipitated calcium carbonate. Twenty-four hour excretion rates of calcium, sulfate, chloride, and net acid were measured at various intervals up to 1 month. Owner name: endstream endobj 93 0 obj <> endobj 94 0 obj <>/Encoding<>>>>> endobj 95 0 obj <> endobj 96 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>> endobj 97 0 obj <>stream Fast CO2 absorption in NH3 or MEA solutions favored vaterite formation. 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. Abstracts., 116:26, 178, abstract No. 92 17 MeSH By continuing to use our website, you are agreeing to our, Adsorption of crystal violet dye by a zeolite-montmorillonite nano-adsorbent: modelling, kinetic and equilibrium studies, Removal of cationic and anionic dyes using purified and surfactant-modified Tunisian clays: Kinetic, isotherm, thermodynamic and adsorption-mechanism studies, AN INTEGRATED EXPERIMENTAL SYSTEM FOR SOLID-GAS-LIQUID ENVIRONMENTAL CELLS, Activation of kaolin with minimum solvent consumption by microwave heating, Kinetic and equilibrium studies of fluoride sorption onto surfactant-modified smectites, Stable isotopic evidence for a prelate Miocene elevation gradient in the Great PlainsRocky Mountain region, USA, The role of clays in the performance of oil-sands tailings management options, Mineralogy and petrology of the Paleocene Clayton and Porters Creek Formations, Missouri, USA: Influence of Cretaceous-Paleogene impact debris and diagenesis, Copyright 2022 Mineralogical Society of America. In FIG. 0000000016 00000 n 2. 3. This invention relates to methods for producing crystalline materials by precipitation. In one embodiment of this aspect of the invention it has been found that by reacting 20% [by mass] solution of Ca(NO.
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