Patent Of Dicalcium Phosphate From Rock Phosphate

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Patent Of Dicalcium Phosphate From Rock Phosphate

US Patent for 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 .alpha.-hydroxysulfonate. Carbonyl and part of the sulfur dioxide are recovered from the solid by low temperature thermal decomposition.

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.

Preparation of dicalcium phosphate from phosphate rock

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 ...

Dicalcium phosphate manufacture - United States Gypsum

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, and sea water to a first mixing zone and mixing them to form a slurry, the quantity of sulfuric acid and sea water charged being about equal to six equivalents of acid per mole of P 2 O 5 content of the rock and about 3% ...

US4177052A - Process for preparing dicalcium phosphate ...

There is disclosed a process for preparing fertilizers containing dicalcium phosphate from phosphates of mineral origin by mechanical activation. According to the invention grains larger than 5 mm of the sized or unsized starting phosphate compound of mineral origin are granulated up to a grain size of 1 to 4 mm, the granulated phosphate obtained is admixed with monocalcium phosphate and the ...

US Patent for Production of dicalcium phosphate or ...

1999-8-25 · 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.

US6183712B1 - Production of dicalcium phosphate or ...

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.

US1235025A - Process of making dicalcium phosphate ...

phosphate making dicalcium phosphate mixture Prior art date 1916-05-01 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 US9460216A Inventor Walter Glaeser Original ...

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 ...

US Patent for Recovery of calcium fluoride from phosphate ...

The recovered solids contained dicalcium phosphate and nearly all of the silica which would otherwise remain in solution at pH values of about 7.0 to 7.5 or less. CONTROL 4 A pond water containing 0.3% F and 0.05% P.sub.2 O.sub.5 is treated with one equivalent of calcium as an aqueous 33% limestone slurry per equivalent of contained fluoride ...

Preparation of dicalcium phosphate from phosphate rock

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 ...

Production of dicalcium phosphate or monocalcium

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 ...

US Patent for Recovery of calcium fluoride from phosphate ...

The recovered solids contained dicalcium phosphate and nearly all of the silica which would otherwise remain in solution at pH values of about 7.0 to 7.5 or less. CONTROL 4 A pond water containing 0.3% F and 0.05% P.sub.2 O.sub.5 is treated with one equivalent of calcium as an aqueous 33% limestone slurry per equivalent of contained fluoride ...

Indian Patents. 202038:A PROCESS FOR THE

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%.

Dicalcium-Phosphates- Process, Technology, Applications ...

2008-11-7 · 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

patents on phosphate rock benefication

2021-8-1 · 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 ...

Di-calcium phosphate by direct acidulation of phosphate

2020-10-13 · phate and undecomposed phosphate rock is obtained instead of di-calcium phosphate. The purpose of this research was to find a method of produc­ ing di-calcium phosphate. Reaction 2 is very difficult to effect. Phosphate rock so treated always contains a high percentage of undecomposed rock, even after a relatively long time.

Reacting An Acid And Phosphate Rock Patents and Patent ...

2008-10-16 · Abstract: Phosphate rock, including low grade phosphate ore, is treated to recover phosphoric acid and other valuable products by a series of steps including contacting phosphate ore with a weak phosphoric acid to form a suspension of at least a portion of the slimes contained in the ore so that the slimes can be separated from the ore, and ...

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

Existing form and distribution of fluorine and phosphorus ...

2021-9-3 · However, phosphate rock acid-insoluble residue is produced during this process as a new type of solid waste, which had a high potential for recycling. For process reasons, this type of residue still contains a certain amount of fluorine and phosphorus, which has a massive impact on the potential uses of phosphate rock acid-insoluble residue.

DI-CALCIUM PHOSPHATE PRODUCTION FROM

2004-9-7 · The process for producing calcium phosphate from phosphoric rocks with a low content of P2O5 and a high content of calcite consists in treating said rocks with a sufficient amount of nitric acid in order to transform insoluble calcium carbonate into soluble calcium nitrate, and insoluble calcium phosphates into soluble calcium phosphates such as phosphoric acid and mono calcium phosphate.

PHOSPHATE - PhoSul LLC

2020-4-2 · phosphate indicalcium and tricalcium (TCP) forms can be released by microbes growing in solution while only 1-33% of the phosphate contained in rock phosphate is released. (Louw et al., A Study of Soil Bacteria Dissolving Certain Mineral Phosphate Fertilizers and Related Com pounds, Journal of Applied Bacteria, vol. 22, pp.

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 low concentration of P 2 O 5 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 ...

Reacting An Acid And Phosphate Rock Patents and Patent ...

2008-10-16 · Abstract: Phosphate rock, including low grade phosphate ore, is treated to recover phosphoric acid and other valuable products by a series of steps including contacting phosphate ore with a weak phosphoric acid to form a suspension of at least a portion of the slimes contained in the ore so that the slimes can be separated from the ore, and ...

patents on phosphate rock benefication

2021-8-1 · 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 ...

Process for preparing dicalcium phosphate containing ...

Patent: United STATES Patent - United States. Application: US19780902931 on 1978-05-05. Publication: 1979-12-04. Abstract. There is disclosed a process for preparing fertilizers containing dicalcium phosphate from phosphates of mineral origin by mechanical activation. According to the invention grains larger than 5 mm of the sized or unsized ...

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

US Patent for Preparation of monocalcium phosphate and ...

Monocalcium phosphate, phosphoric acid and/or potassium phosphate containing fertilizers are produced in a process involving acidulation of phosphate rock with phophoric acid in the presence of added silicon dioxide and potassium ion whereby fluorides contained in the rock are converted to K.sub.2 SiF.sub.6, wherein monocalcium phosphate dissolved in phosphoric acid is formed during acidulation.

(PDF) WORLD PHOSPHATE INDUSTRY - ResearchGate

World phosphate rock production was 241 Mt. in 2015 and is forecasted to be 250 Mt in 2020 (USGS, 2017; Heffer a nd Prud‟homme, 2016). The world phosphate production by countries in 2016 is ...

Mussoorrie rock phosphate-pyrite mixture as phosphate ...

Mussoorrie rock phosphate (MRP), MRP + pyrite (25% by weight), diammonium phosphate (DAP), ammonium polyphosphate (APP) and nitrophosphate (NP) were compared in a field experiment as fertilizers for wheat. At 20 kg P ha−1, MRP was only 6 per cent as effective as DAP. However, when it was mixed with pyrite, the efficiency of MRP increased to 64 per cent at 20 kg P ha−1 compared with