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A method of preparing dicalcium phosphate from phosphate rock wherein the rock is treated with a mixture of water, carbonyl, and sulfur dioxide. Solids are separated from the liquid phase. The solid phase consists of a mixture of gangue, and calcium α-hydroxysulfonate. Carbonyl and part of the sulfur dioxide are recovered from the solid by low temperature thermal decomposition.
dicalcium phosphate is prepared from phosphate rock by a process which comprises reacting phosphate rock with sulfur dioxide and an organic carbonyl compound for 0.5 to 10 hours while maintaining the temperature of the reaction mixture below 50° C. The reaction yields a mixture of gangue, solid calcium α-hydroxy sulfonate and soluble dicalcium phosphate.
A method of preparing dicalcium phosphate from phosphate rock wherein the rock is treated with a mixture of water, carbonyl, and sulfur dioxide. Solids are separated from the liquid phase. The solid phase consists of a mixture of gangue, and calcium .alpha.-hydroxysulfonate. Carbonyl and part of the sulfur dioxide are recovered from the solid by low temperature thermal decomposition.
The process comprises the reaction of an excess of phosphate rock with aqueous solutions of a mineral acid selected from hydrochloric acid, phosphoric acid and nitric acid, characterized by the...
United States Patent 4154799 . Abstract: A process is described for highly efficient recovery of phosphate values from a wide range of phosphate rock including low grade phosphate rock material by leaching with a dilute sulfuric acid and precipitating phosphate values as dicalcium phosphate. Water savings are accomplished in the process by the use of sea water instead of fresh water.
12/09/1978· Bridger (U.S. Letters Patent No. 3,011,888) shows that dicalcium phosphate may be prepared, without the use of excess acid, by treating phosphate rock with water and phosphoric acid, curing the product (principally monocalcium phosphate and phosphate rock) at room temperature for several days, mixing it with more water and hydrolyzing the monocalcium phosphate to dicalcium phosphate
This invention relates to the preparation of feed grade dicalcium phosphate from a source containing monocalcium phosphate such as super phosphate, concentrated super phosphate and the like. The first step consists of leaching water soluble mono calcium phosphate therefrom with water or recycle wash water from one of the subsequent steps.
The invention relates to a combined process for the manufacture of feed grade dicalcium phosphate and pure phosphoric acid.
Feed grade dicalcium phosphate has a chemical formula CaH PO4 2H2O wherein phosphorus expressed as P is 18% and calcium expressed as Ca is at least 23%. Maximum fluorine content is 0.16%. Rock phosphates and bone ash are natural sources of calcium phosphate in the form of tricalcium phosphate of the chemical formula Ca3 (PO^. Acidification of
Dicalcium Phosphate From Rock Phosphate Dicalcium phosphate, also known as calcium monohydrogen phosphate, is a dibasic calcium phosphate. •Dicalcium phosphate is usually found as the dihydrate, but it can be thermally converted to the anhydrous form. It is practically insoluble in water, with a solubility of 0.02 g per 100 mL at 25 °C. •Dicalciumphosphate (CaHPO4.2H2O) is a chemical
Justia Patents Forming Insoluble Substance In Liquid US Patent for Dicalcium phosphate manufacture Patent (Patent # 4,154,799) Dicalcium phosphate manufacture . Mar 27, 1978 United States Gypsum Company. A process is described for highly efficient recovery of phosphate values from a wide range of phosphate rock including low grade phosphate rock material by leaching with a dilute sulfuric
United States Patent 4154799 . Abstract: A process is described for highly efficient recovery of phosphate values from a wide range of phosphate rock including low grade phosphate rock material by leaching with a dilute sulfuric acid and precipitating phosphate values as dicalcium phosphate. Water savings are accomplished in the process by the use of sea water instead of fresh water.
12/09/1978· Bridger (U.S. Letters Patent No. 3,011,888) shows that dicalcium phosphate may be prepared, without the use of excess acid, by treating phosphate rock with water and phosphoric acid, curing the product (principally monocalcium phosphate and phosphate rock) at room temperature for several days, mixing it with more water and hydrolyzing the monocalcium phosphate to dicalcium phosphate
GB782177A Dicalcium phosphate Google Patents. Fluoride is removed in the preparation of dicalcium phosphate from wet process phosphoric acid by neutralizing the acid with an alkaline compound of calcium, e.g. lime or calcium carbonate, to a pH range 2.9-3.1; removing the precipitate, which is mainly fluoride; and then neutralizing the residual acid to precipitate dicalcium phosphate.
patent of dicalcium phosphate from rock phosphate. Processes for the manufacture of feedgrade dicalcium . Oct 26 1976 The combined process of DCP manufacture and phosphoric acid production minimizes any losses of P 2 O 5 normally encountered in the attack on rock phosphate by a mineral acid in the DCP manufacture since according to the present invention the reaction system for the
US1235025A Process of making dicalcium phosphate. UNITED STATES PATENT OFFICE. WALTER.GLAESEB, 0F BROOKLYN, NEW YORK. PROCESS OF MAKING DICALCIUM PHOSP
Dicalcium Phosphate From Rock Phosphate Dicalcium phosphate, also known as calcium monohydrogen phosphate, is a dibasic calcium phosphate. •Dicalcium phosphate is usually found as the dihydrate, but it can be thermally converted to the anhydrous form. It is practically insoluble in water, with a solubility of 0.02 g per 100 mL at 25 °C. •Dicalciumphosphate (CaHPO4.2H2O) is a chemical
Patent Of Dicalcium Phosphate From Rock Phosphate. GB782177A Dicalcium phosphate Google Patents. Fluoride is removed in the preparation of dicalcium phosphate from wet process phosphoric acid by neutralizing the acid with an alkaline compound of calcium, e.g. lime or calcium carbonate, to a pH range 2.9-3.1; removing the precipitate, which is mainly fluoride; and then neutralizing the residual
Phosphate rock consists of the mineral apatite, usually fluor-apatite Ga^gFgCPO^)/, plus impurities. When sulfuric acid is added it not only reacts with the apatite but also with the calcium fluoride in the apatite structure, and directly or indirectly with such impurities as organic matter, iron and aluminum compounds, carbonates of lime and magnesium (24). During acidulation, the apatite
Dicalcium phosphate shows the most commonly used production method is known as the “wet acid” route in which rock phosphate is reacted with sulphuric acid to produce phosphoric acid. After concentration and purification to reduce the level of undesirable elements, this phosphoric acid is
Dicalcium Phosphate From Rock Phosphate Dicalcium phosphate, also known as calcium monohydrogen phosphate, is a dibasic calcium phosphate. •Dicalcium phosphate is usually found as the dihydrate, but it can be thermally converted to the anhydrous form. It is practically insoluble in water, with a solubility of 0.02 g per 100 mL at 25 °C. •Dicalciumphosphate (CaHPO4.2H2O) is a chemical
Abstract: dicalcium phosphate is prepared from phosphate rock by a process which comprises reacting phosphate rock with sulfur dioxide and an organic carbonyl compound for 0.5 to 10 hours while maintaining the temperature of the reaction mixture below 50.degree. C. The reaction yields a mixture of gangue, solid calcium .alpha.-hydroxy sulfonate and soluble dicalcium phosphate. The solids are
A new process to produce defluorinated dicalcium phosphate (DCP) using phosphate rock concentrate has been developed. This new process has as main characteristic the low concentration of P2O5 in the liquid phase. The process comprises three main steps: solubilization of the phosphate rock concentrate with sulfuric acid, defluorination of the phosphoric acid solution with potassium sulfate and
GB782177A Dicalcium phosphate Google Patents. Fluoride is removed in the preparation of dicalcium phosphate from wet process phosphoric acid by neutralizing the acid with an alkaline compound of calcium, e.g. lime or calcium carbonate, to a pH range 2.9-3.1; removing the precipitate, which is mainly fluoride; and then neutralizing the residual acid to precipitate dicalcium phosphate.
United States Patent 6183712 . Abstract: A method of producing dicalcium phosphate from calcium phosphate includes reacting the calcium phosphate with a mineral acid such as sulphuric acid to produce a calcium salt and phosphoric acid. The calcium salt may then be hydrolyzed to form a calcium alkali which may then be reacted with the phosphoric acid to produce dicalcium phosphate. Also, a
US1235025A Process of making dicalcium phosphate. UNITED STATES PATENT OFFICE. WALTER.GLAESEB, 0F BROOKLYN, NEW YORK. PROCESS OF MAKING DICALCIUM PHOSP
In my previous patent, No. 2,360,197, issued October 10, 1944, I have disclosed various processes for manufacturing defluorinated phosphate, including a process for calcining triple superphosphate. Triple superphosphate is made by treating each ton of Florida rock with about two tons of commercial or fertilizer grade phosphoric acid (H3PO4) of about 60* Baum6 strength, containing about 62.5%
infringe valid patents or as extending license under valid patents. Product Information DICALCIUM PHOSPHATE, ANHYDROUS USP/FCC GRADE DESCRIPTION Dicalcium Phosphate, Anhydrous is a white, odorless, tasteless powder. It is stable in air. European Pharmacopoeia (EP 3rd ed.) Certificates of Analysis are available on request. USES Dentifrice As a polishing agent. Pharmaceutical In the
US Patent,Process for the manufacture of . manufacturing process of dicalcium phosphate MC World.INC. manufacturing process of dicalcium phosphate. AS a leading global manufacturer of crushing and milling equipment, we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete stone crushing plant.dry
process for making dicalcium phosphate from rock phosphate. Jul 26, 2016 process for making dicalcium phosphate from rock phosphate phosphate processing flow sheet.pdf schematic ball mill rock pdf, Mining . beneficiated wet rock phosphate flow . phosphate process mill in acid gezinsbondsint-amands. Phosphate Acid Plant in Petrokimia Gresik Flow diagram of the process to making phosphate
A process is provided for the production of dicalcium phosphate form a phosphate source material in which a solution of phosphoric acid is produced by the action of a suitable mineral acid, generally sulphuric acid, on a phosphate source material. Calcium fluoride is precipitated at a pH of between 3.5 and 4.5 followed by hydrolyzing the solution by diluting it with water to a ratio of
A new process to produce defluorinated dicalcium phosphate (DCP) using phosphate rock concentrate has been developed. This new process has as main characteristic the low concentration of P2O5 in the liquid phase. The process comprises three main steps: solubilization of the phosphate rock concentrate with sulfuric acid, defluorination of the phosphoric acid solution with potassium sulfate and
European Patent Office EPO. Search worldwide, life-sciences literature Search. Advanced Search. E.g. "breast cancer" HER2 Smith J. Recent Activity Export List Clipboard Export DICALCIUM PHOSPHATE SLURRIES (PAT WO9739101) CLAPPERTON Richard Malcolm. ALBRIGHT & WILSON UK LIMITED. Patent: Publ.of the Int.Appl. with Int.search report World Intellectual Property Organization.
patent of dicalcium phosphate from rock phosphate. rock phosphate manufactures algeria Dicalcium Phosphate Manufacturers, Search Indian Dicalcium Phosphate Manufacturers and Suppliers Details Contact to Dicalcium Phosphate Exporters in India Get Price. dicalcium phosphate machinery production . machinery equipment dicalcium phosphate plant line. Home
US1235025A Process of making dicalcium phosphate. UNITED STATES PATENT OFFICE. WALTER.GLAESEB, 0F BROOKLYN, NEW YORK. PROCESS OF MAKING DICALCIUM PHOSP
Potentially harmful phosphate-based products derived from the wet acid digestion of phosphate rock represent one of the most serious problems facing the phosphate industry. This is particularly true for dicalcium phosphate (DCP), a food additive produced from either sulphuric acid or hydrochloric ac Radioactivity Contents in Dicalcium Phosphate and the Potential Radiological Risk to Human
01/04/1994 A new process for the production of defluorinated dicalcium phosphate using phosphate rock was developed. This new process has the main characteristic of being clean, without the production of any liquid waste. The process has essentially three main steps: phosphate rock digestion, defluorination and neutralization. In the first step a phosphate rock slurry is batch digested . Cited
In my previous patent, No. 2,360,197, issued October 10, 1944, I have disclosed various processes for manufacturing defluorinated phosphate, including a process for calcining triple superphosphate. Triple superphosphate is made by treating each ton of Florida rock with about two tons of commercial or fertilizer grade phosphoric acid (H3PO4) of about 60* Baum6 strength, containing about 62.5%
Dicalcium phosphate is the calcium phosphate with the formula CaHPO 4 and its dihydrate. The "di" prefix in the common name arises because the formation of the HPO 4 2 anion involves the removal of two protons from phosphoric acid, H 3 PO 4. It is also known as dibasic calcium phosphate or calcium monohydrogen phosphate. Dicalcium phosphate is used as a food additive, it is found in some
process for making dicalcium phosphate from rock phosphate. Jul 26, 2016 process for making dicalcium phosphate from rock phosphate phosphate processing flow sheet.pdf schematic ball mill rock pdf, Mining . beneficiated wet rock phosphate flow . phosphate process mill in acid gezinsbondsint-amands. Phosphate Acid Plant in Petrokimia Gresik Flow diagram of the process to making phosphate
