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patent of dicalcium phosphate from rock phosphate

US4113842A Preparation of dicalcium phosphate from

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.

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US2728635A Production of feed grade dicalcium phosphate

phosphate hydrolysis solution dicalcium phosphate rock Prior art date 1951-07-16 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 Lifetime Application number US236886A Inventor Miller Ralph

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US3988420A Processes for the Google Patents

The invention relates to a combined process for the manufacture of feed grade dicalcium phosphate and pure phosphoric acid. 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 fact that the free acidity of the dissolution liquor does not exceed 60% and

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US Patent for Production of dicalcium phosphate or

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.

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Preparation of dicalcium phosphate from phosphate rock by

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

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Production of dicalcium phosphate Seyfried, Warren R.

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

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Preparation of dicalcium phosphate from phosphate rock by

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

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US2114600A Manufacture of dicalcium phosphate and alkali

US2114600A US758093A US75809334A US2114600A US 2114600 A US2114600 A US 2114600A US 758093 A US758093 A US 758093A US 75809334 A US75809334 A US 75809334A US 2114600 A US2114600 A US 2114600A Authority US United States Prior art keywords solution alkali metal phosphate dicalcium phosphate nitrate Prior art date 1933-12-23 Legal status (The legal status is

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Production of dicalcium phosphate Seyfried, Warren R.

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

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patent of dicalcium phosphate from rock phosphate

Production of defluorinated dicalcium phosphate from phosphate rock concentrate. A.M.B. Freitas and ; M. Giulietti Patent 9.105.182-7. Legal CC and Myrick Jr. OD. Di-calcium phosphate by direct acidulation of phosphate rock phosphate rock to the filtrate and final separation of di-calcium

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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 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 fact that the free acidity of the dissolution liquor does not exceed 60% and

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Indian Patents. 202038:A PROCESS FOR THE MANUFACTURE OF

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. 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%.

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Production of dicalcium phosphate or monocalcium phosphate

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, Ca 3 (PO 4) 2, commonly known as calcium phosphate, occurs in nature as rock phosphate ore, for example and is used as such as a source of

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Phosphates Production,Technology, Applications, Patent

Phosphate rock production rose 1.5 percent to 168 million tonnes in 2005. The largest producer was China, while the US, Morocco and Former Soviet Union countries also achieved significant volumes. Patent . Phosphates; Production of dicalcium phosphate or monocalcium phosphate ; Process for phosphating metal; Phosphating Operation

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Dicalcium-Phosphates- Process, Technology, Applications

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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Paten Dicalcium Phosphate

Dicalcium phosphate Dicalcium phosphate is the calcium phosphate with the formula CaHPO 4 and its dihydrate. The quotdiquot prefix in the common name arises because the formation of the HPO 4&patent of dicalcium phosphate from rock phosphate. Dapatkan Dukungan » dicalcium phosphate patents. The dicalcium phosphate product is screened and dried

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Method of phosphate ore processing

The separated aqueous phase containing phosphate ions, calcium and chloride coming from the separator device 6 to line 12, is directed into the tank 13 subsequent neutralization, where the precipitated dicalcium phosphate DCP by introducing into the liquid phase through the pipeline 14 neutralizing agent of the type that was specified above

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manufacturing process of dicalcium phosphate pdf « BINQ Mining

Processes for the manufacture of feed-grade dicalcium phosphate . 26 Oct 1976 The process comprises the reaction of an excess of phosphate rock with aqueo. Download PDF 3988420 PDF help. US Patent 3033669, Process for the manufacture of dicalcium phosphate, May, 1962, Strauchen et al. »More detailed

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Process for the manufacture of monopotassium phosphate

According to a preferred embodiment, which enables to obtain a maximum yield of P 2 O 5 and K 2 O recovery, it is suggested to carry out the reaction with phosphate rock or dicalcium phosphate (or mixtures thereof) in two or more stages: in the first stage, the reaction occurs beween monopotassium sulfate and part of the phosphate rock or

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Radioactivity Contents in Dicalcium Phosphate and the

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

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