US2078627A

a particular object of the invention is sub- The process involves the manufacture of mastantially to prevent precipitated dicalcium phosterial like dicalcium phosphate by the addition phate from reacting with the free lime to form 5 of a reactive form of alkali earth metal oxide, tricalcium phosphate, by maintaining in the soluusually milk of lime, to a …

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US2114600A

The method of producing dicalcium phosphate and sodium nitrate from phosphate rock containing fluorine which comprises reacting the phosphate rock with nitric acid in the presence of sufiicient silica for precipitating as silicofiuoride substantially all of the fluorine present in rock in the presence of an excess of alkali metal nitrate ...

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Process for producing phosphoric acid and dicalcium phosphate

A process for producing dicalcium phosphate which comprises reacting aqueous sulfuric acid having from 50% to by weight sulfuric acid with phosphatic raw material, selected from the group consisting of raw phosphate rock ore, phosphate rock concentrates, phosphatic by-products and phosphatic waste materials from phosphate …

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US7101522B2

phosphate calcium solution precipitate dicalcium phosphate Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related, expires Application number US10/296,625

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US4154799A

Priority to US05/890,110 priority Critical patent/US4154799A/en Application granted ... It is an object and advantage of the present invention to provide for the manufacture of dicalcium phosphate from phosphate rock with the efficient recovery of phosphatic values by dilute acid leaching without requiring the use of large ...

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Process for the production of monoammonium and diammonium phosphate

Definitions. Monoammonium phosphate and diammonium phosphate, useful as fertilizers, are prepared from phosphorusbearing rock through a series of reactions including initially treating the phosphorus-bearing rock with nitric acid to form a slurry of phosphoric acid, calcium nitrate, impurities, and Water; dicalcium phosphate is added to the slurry to …

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Preparation of dicalcium phosphate from phosphate rock …

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. ... View Patent Images: Download PDF 4113842 . US Patent References: 1981145: Process of producing phosphoric acid: : Keller: 423/321S:

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Production of dicalcium phosphate

A process of producing dicalcium phosphate55 which comprises digesting phosphate rock with sulphuric acid of from 220 to 34° Be. strength to produce a solution of …

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US1326533A

rock dicalcium phosphate making material produced Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) ... Priority to US28174919A priority Critical patent/US1326533A/en ...

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US3391993A

rock dicalcium phosphate slurry feed grade Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) ... Priority to US440788A priority Critical patent/US3391993A/en ...

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NATIONAL MINERAL INVENTORY

The total resources of rock phosphate in the country as on 1.4.2015 are estimated at 312.68 million tonnes, of these 45.81 million tonnes(14.65%) fall under reserve category …

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US2021527A

a process for producing dicalcium phosphate which comprises dissolving raw tricalcium phosphate by treatment with a solution containing mono-calcium phosphate, phosphoric acid and sulphuric acid in such proportions that the resulting solution still contains a substantial excess of phosphoric acid over the ratio prevailing in mono-calcium …

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US3988420A

gases containing hydrogen chloride it is obviously desirable to use the gases directly in the acidulation step (d) of the phosphate rock and to avoid separate production of aqueous hydrochloric acid prior to the reaction of phosphate rock. In this case, the absorption of HCl and the reaction with phosphate rock occur in the same unit. A disclosure on this …

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US2115150A

US2115150A US67290A US6729036A US2115150A US 2115150 A US2115150 A US 2115150A US 67290 A US67290 A US 67290A US 6729036 A US6729036 A US 6729036A US 2115150 A US2115150 A US 2115150A Authority US United States Prior art keywords solution phosphate phosphoric acid ferrocyanide iron Prior art date 1936-03 …

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Production of defluorinated dicalcium phosphate from …

A new process to produce defluorinated dicalcium phosphate (DCP) using phosphate rock concentrate has been developed. This new process has as main characteristic the …

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Processes for the manufacture of feed-grade dicalcium …

The invention relates to a combined process for the manufacture of feed grade dicalcium phosphate and pure phosphoric acid. The process comprises the …

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WO2001089990A1

WO2001089990A1 - The production of dicalcium phosphate or monocalcium phosphate - Google Patents The production of dicalcium phosphate or monocalcium phosphate Download PDF Info Publication number ... Priority to DE60112289T priority patent/DE60112289D1/de Publication of WO2001089990A1 publication …

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WO2005087661A1

The present invention relates to a cyclic process for continuous production of dicalcium phosphate from rock phosphate. Rock phosphate is treated with excess of spent acid or weak sulphuric acid under agitation. The slurry obtained is filtered and the filter cake is recycled for further leaching. Fresh rock phosphate is added to the filtrate under stirring …

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US6183712B1

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. ... Priority to US09/383,083 priority Critical patent ... commonly known as calcium phosphate, occurs in nature as rock phosphate ore, for ...

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US Patent for Preparation of dicalcium phosphate from …

The prior art teaches that phosphate rock can be converted to dicalcium phosphate by acidulating the rock with an excess of mineral acid to dissolve the P.sub.2 O.sub.5, then …

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(PDF) Synthesis of di-calcium phosphate used as …

The best values in terms of quality and quantity of di-calcium phosphate from locally phosphate rock were achieved at acid concentration of 10% w/w, reaction time of 1.5 hrs, at 30 °C and pH ...

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Dicalcium-Phosphates- Process, Technology, Applications, Patent

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

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Production of feed grade dicalcium phosphate

A method of producing feed grade dicalcium phosphate which comprises acidulating a fluorine-containing phosphate rock with a mixture of sulfuric and phosphoric acids to form superphosphate, hydrolyzing the superphosphate with a limited excess of water to form a hydrolysis product comprising a uorine-containing solid and dicalcium phosphate and ...

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CA2410363C

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 hydrolysing the solution by …

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Calcium and phosphorus digestibility in rock- and bone …

Rock-derived calcium phosphates such as mono-calcium phosphate (MCP), di-calcium phosphate (DCP) and tri-calcium phosphate (TCP), that are added in pigs …

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DE379835C

dicalcium phosphate rock phosphate iron free Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Application number DEB102605D Other languages German (de) Original …

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DE875951C

DE875951C DED4047D DED0004047D DE875951C DE 875951 C DE875951 C DE 875951C DE D4047 D DED4047 D DE D4047D DE D0004047 D DED0004047 D DE D0004047D DE 875951 C DE875951 C DE 875951C Authority DE Germany Prior art keywords phosphate calcium nitrate nitric acid added amount Prior art date …

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US3342580A

A process for producing from phosphate rock dicalcium phosphate of animal feed grade comprising (1) decomposing said phosphate rock with an aqueous solu tion of nitric acid to form an aqueous solution containing calcium nitrate, phosphoric acid and nitric acid and containing -200 grams of P 0 per liter of solution, (2) separating the acid ...

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Dicalcium phosphate manufacture

What is claimed is: 1. A process for producing dicalcium phosphate from rock phosphate which comprises: (a) Continuously feeding finely divided rock phosphate, sulfuric acid, …

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US1504340A

Priority to US551917A priority Critical patent/US1504340A/en Application granted granted ... the present invention relates to a new and improved method of manufacturing mono-sodium phosphate using either phosphate rock or dicalcium phosphate or any similar phosphatic material as a base material from whichthe mono …

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Production of defluorinated dicalcium phosphate from …

A new production process of defluorinated dicalcium phosphate from phosphate rock concentrate was devel-oped (Giulietti, 1989), having as main characteristic the low …

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