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  • 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.

  • 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.

  • 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

  • Process for preparing dicalcium phosphate containing

    View Patent Images: Download PDF 4177052 . US Patent References: 4113842: Preparation of dicalcium phosphate from phosphate rock by the use of sulfur dioxide, water, and carbonyl compounds: 1978-09-12: McCullough et al. 71/33: 3679390: N/A:

  • 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

  • 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

  • US2078627A Manufacture of dicalcium phosphate Google

    US2078627A US729358A US72935834A US2078627A US 2078627 A US2078627 A US 2078627A US 729358 A US729358 A US 729358A US 72935834 A US72935834 A US 72935834A US 2078627 A US2078627 A US 2078627A Authority US United States Prior art keywords phosphate lime monosodium disodium solution Prior art date 1934-06-07 Legal status (The legal status is an

  • 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

  • Production of dicalcium phosphate Google Patents

    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 1936-03-05 Legal status (The legal status is an assumption and is not

  • 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%.

  • 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

  • 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

  • Process for preparing dicalcium phosphate containing

    What we claim is: 1. A process for preparing a fertilizer containing dicalcium phosphate from a tricalcium phosphate of mineral origin, said preparing being in the presence of monocalcium phosphate, which process comprises granulating the grains of the sized or unsized phosphate of mineral origin which are larger than 5 mm to a grain size of 1 to 4 mm, admixing the mineral phosphate with

  • 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

  • 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

  • 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

  • Phosphates Production,Technology, Applications, Patent

    Primary Information Services 21 Murugappan St, SwamyNagar Ext2, Ullagaram, Chennai 600091, India. Phone: 91 44 22421080 Email : [email protected]

  • dicalcium phosphate machinery production process rock

    Dicalcium Phosphate Making Process. Dicalcium Phosphate Making Process dicalcium phosphate machinery production process 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 ac After concentration and purification to reduce the level of undesirable elements, this

  • Method of phosphate ore processing

    FIELD: chemistry. SUBSTANCE: method of phosphate ore processing includes one-step counterflow process of phosphate ore decomposition, characterised by P 2 O 5 content exceeding 20% in weight, by processing it with water solution of hydrochloric acid, which has HCl concentration lower than 10% in weight, with formation of processing solution, consisting of water phase, in which calcium

  • 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

  • DI-Calcium phosphate Ca2O4P+ PubChem

    DI-Calcium phosphate Ca2O4P+ CID 21584077 structure, chemical names, physical and chemical properties, classification, patents, literature, biological

  • Dicalcium Phosphate Equipment Production Process

    Dicalcium Phosphate Machinery Production Process. Dicalcium Phosphate Flow Chart Treffpunkt. Dicalcium Phosphate Flow Chart. With more than 2,500 case sites, the scientific management method, the refined manufacturing process, and the innovative manufacturing concept,have rapidly grown into the mining machinery production and export bases in China even the world.