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Dicalcium phosphate by direct acidulation of phosphate rock. phosphate rock to the filtrate and final separation of dicalcium phos phates . ... tween sulfuric acid, tricalcium phosphate and calcium fluoride. The tricalcium phosphate .... water is sprayed. In this process phosphoric acid, monocalcium phos. Read More
UNITED STATES PATENT OFFICE., 0F BROOKLYN, NEW YORK. PROCESS OF MAKING DICALCIUM PHOSPHATE. No Drawing. To all whom it may concern 7 Be it known that I, WALTER GLAESER, a subject of the GermanEmperor, and a resident,of Brooklyn, county of Kings, and State of New York, have invented a new and useful Improvement in Processes of Making Dicalcium Phosphate.
A method of producing feed grade dicalcium phosphate from phosphate rock which comprises acidulating phosphate rock with phosphoric acid to form triple superphosphate, hydrolyzing the triple superphosphate with a limited excess of water to form a hydrolysis product comprising a fluorinecontaining solid and dicalcium phosphate and a phosphate ...
Full Text: This invention relates to a process for the manufacture of feed grade dicalcium phosphate. Dicalcium phosphate known, as DCP is a commonly used animal feed supplement and it is desirable to obtain dicalcium phosphate free of contaminants, particularly fluoride containing compounds.
The phosphate has to be solubilized to facilitate absorption by plants. The solubilization process is essentially the same as proposed by Liebig for bone phosphate. But acid treatment of rock phosphate releases hydrogen fluoride and silicon fluoride.
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 αhydroxysulfonate. Carbonyl and part of the sulfur dioxide are recovered from the solid by low temperature thermal decomposition.
The dicalcium phosphate product is screened and dried, if desired, and stored for packaging or distribution. The dicalcium phosphate product is equivalent in all respects to dicalcium phosphate made from the much more expensive electricfurnace phosphoric acid and possesses an elemental phosphorus to elemental fluorine ratio greater than 100 to 1.
It also relates to methods for the manufacture of monocalcium phosphate fertilizer, edible monocalcium phosphate and edible dicalcium phosphates. BACKGROUND OF THE INVENTION. Tricalcium orthophosphate, Ca3(PO4)2, commonly known as calcium phosphate, occurs in nature as rock phosphate ore, for example and is used as such as a source of fertilizer.
dicalcium phosphate by direct acidulation of phosphate rock. In general, when phosphate rock is treated with sulfuric acid, monocalcium phosphate or phosphoric acid is formed. If less sulfuric acid is used, dicalcium phosphate should be formed theoretically, however only monocalcium phosphate and undecomposed phos phate rock result in ...
Apr 04, 2001· 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 and followed by hydrolyzing the solution by diluting it with water to a ratio of ...
Dicalcium phosphate is used as a food additive, it is found in some toothpastes as a polishing agent and is a biomaterial. Preparation. Dibasic calcium phosphate is produced by the neutralization of calcium hydroxide with phosphoric acid, which precipitates the dihydrate as a solid. At 60 ...
Preparation of monocalcium phosphate and/or phosphoric . Two additional patents of pertinence to processes of this type are Pat. Nos. 2,567,227 and 2,728,635 to Miller which disclose the acidulation of phosphate rock with phosphoric acid to form monocalcium phosphate, cooling to crystallize the monocalcium phosphate and then converting it to dicalcium phosphate by disproportionation.
May 15, 1979· Dicalcium phosphate manufacture . United States Patent . 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. ... It is an object ...
Compared with superphosphate manufacture, the production of dicalcium phosphate for fertilizer purposes, by the conventional method of dissolving phosphate rock in hydrochloric acid and precipitating the phosphate with milkoflime, is uneconomical of reagent materials.
A process of producing dicalcium phosphate which comprises digesting phosphate rock with sulphuric acid of 25% to 40% strength, the acid employed being 1% to 5% in excess of the amount calculated to liberate the P2Os content of the rock as H3P04, filtering the resulting solution of45 phosphoric and sulphuric acids, adding to the solution ground ...
pure dihydrate dicalcium phosphate. In the final stage, this precipitate is granulated and dried. This Ecophos process has several advantages over classic technology: The classic process uses sulphuric acid to dissolve rock phosphate; but, in addition to the P2O5, most of the other chemical elements present in the rock
Jul 26, 2016· Phosphate rock shipped from mine, digestion of rock phosphate ? phosphate rock digestion with hydrochloric acid ? gold process for making dicalcium phosphate from rock phosphate dicalcium ...
The method of preparing monocalcium phosphate which comprises reacting lime with crude phosphoric acid containing iron and fluorine in solution to form a monocalcium phosphate liquor containing fluorine in amount less than about % and from about % to % iron, calculated as FPe203 and having a pH between about 2 and about 3, adding ...
Tricalcium phosphate (sometimes abbreviated TCP) is a calcium salt of phosphoric acid with the chemical formula Ca 3 (PO 4) is also known as tribasic calcium phosphate and bone phosphate of lime (BPL).It is a white solid of low solubility. Most commercial samples of "tricalcium phosphate" are in fact hydroxyapatite.
DICalcium phosphate | Ca2O4P+ | CID structure, chemical names, physical and chemical properties, classification, patents, literature, biological ...
Monocalcium phosphate is an inorganic compound with the chemical formula Ca(H 2 PO 4) 2 ("AMCP" or "CMPA" for anhydrous monocalcium phosphate). It is commonly found as the monohydrate ("MCP" or "MCPM"), Ca(H 2 PO 4) 2 ·H 2 O. Both salts are colourless solids. They are used mainly as superphosphate fertilizers and are also popular leavening agents.
Dicalcium Phosphate Patents anreximin patent of dicalcium phosphate from rock phosphate Patents on Phosphate processingbone and, But acid treatment of rock phosphate . Get Information; phosphate rock dicalcium . Dicalcium phosphate Wikipedia. Dicalcium phosphate is the calcium phosphate with the formula CPO4 and its dihydrate.
This invention relates to a process for producing phosphoric acid and dicalcium phosphate. More particularly, the invention provides a process for obtaining relatively pure phosphoric acid and/or impure fertilizergrade dicalcium phosphate from lowgrade phosphatic raw materials as well as from highgrade phosphate rock. 2.
Aug 13, 2013· Search for Acid Treatment Patents and Patent Applications (Class 423/) Filed with the USPTO ... Phosphate rock is reacted with phosphoric acid to produce monobasic calcium phosphate. Monobasic calcium phosphate is reacted with ammonium carbonate to produce ammonium phosphate. ... A process is provided for the production of dicalcium ...
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