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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.
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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, …
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The present invention relates to a process for the manufacture of disodium phosphate of a high purity without utilizing organic solvents. According to the process, monosodium sulfate is reacted, at a temperature, in the range of 40 to 100 degrees C. with a phosphate constituent selected from phosphate rock, dicalcium phosphate or mixtures thereof, in the presence of phosphoric acid.
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When applied to P2O5 from dicalci-um phosphate per P2O5 from defluorinated phosphoric acid, this relation attains maximum values of the order of 1.3 only (ANDA, 1987). The economical …
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In this study, we develop an integrated process for the direct recovery and separation of dicalcium phosphate dihydrate for fertilizer and livestock feed additive production from a low-grade (2.0 wt% P) iron-rich (19.7 wt% Fe) phosphate ore.
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This paper presents results laboratory experiments to test a new process for manufacture of dicalcium phosphate. The process is based on the nitric acidulation of phosphate rock concentrate, followed by neutralization of the extract liquor with calcium carbonate. The precipitated dicalcium phosphate is
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Priority to US631848A priority Critical patent/US2012436A/en ... i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and ... but to break up lumps and expose any particles of initially formed dicalcium phosphate to the action of phosphoric acid. The tub 2 has a hollow ...
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De Waal, J.C., 2003. Production of dicalcium phosphate or monocalcium phosphate. United States patent US 20030161778A1. Available at: …
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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.
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In a process for producing dicalcium phosphate from a material containing iluorine impurities prepared by reacting calcium phosphate containing material with concentrated sulphuric acid and water in an amount approximately sucient to supply the stoichiometric requirement for conversion to monocalcium phosphate and to convert said rock to a ...
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De Waal, J.C., 2003. Production of dicalcium phosphate or monocalcium phosphate. United States patent US 20030161778A1. Available at: (Accessed October 22, 2021).
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When applied to P2O5 from dicalci-um phosphate per P2O5 from defluorinated phosphoric acid, this relation attains maximum values of the order of 1.3 only (ANDA, 1987). The economical interest in producing dicalcium phosphate directly from phosphate rock concentrate resides in …
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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 values of 2.3-2.4 (during precipitation of impurities) and 5.5-5.6 ...
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A process for producing dicalcium phosphate which comprises reacting aqueous sulfuric acid having from 50% to 100% 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 rock ...
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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 …
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In this study, we develop an integrated process for the direct recovery and separation of dicalcium phosphate dihydrate for fertilizer and livestock feed additive production from a low-grade (2.0 wt% P) iron-rich (19.7 wt% Fe) …
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dicalcium phosphate by the nitric acid route. monium nitrate and calcium carbonate by means of ammonia and carbon dioxide. In this case ammonium nitrate solution is separated from the ... The phosphate rock concentrate is a high-grade concentrate containing about 91% apatite by weight. This apatite is a hydroxy-fluorapatite
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United States Patent 4154799. 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.
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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 …
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Example 1 100 parts by weight of monosodium phosphate solution having a P O -content of 15.6% were mixed with 19 parts by weight of calcium sulfate dihydrate and 8 parts by weight of calcium hydroxide and treated for 6 hours at temperatures of 20 to 40 C. while agitating with a turbine agitator (5000 r.p.m.) of the Turrax System. The calcium phosphate formed was filtered …
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Phosphoric acids which are obtained on acidification of natural phosphates are purified and then neutralized to produce dicalcium phosphate. In the US patent no.6183712 a process wherein calcium phosphate is reacted with a mineral acid and the product thus obtained is hydrolyzed to form a corresponding calcium salt has been reported ...
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A process for the manufacture of disodium phosphate of a high purity without utilising organic solvents. Monosodium sulfate is reacted, at a temperature in the range of 40 to 100 DEG C with a phosphate constituent selected from phosphate rock, dicalcium phosphate or mixtures thereof, in the presence of phosphoric acid. The common metal impurities, organic matter and fluorides …
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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 …
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United States Patent 4154799. 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 …
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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 …
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U.S. Pat. Nos. 3,919,395 and 4,012,491 have provided processes for the manufacture of dicalcium phosphate using dilute mineral acids to digest a wide range of phosphate rock. These processes, however, require the use of large quantities of fresh water.
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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 convert the phosphoric …
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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.
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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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This paper presents results laboratory experiments to test a new process for manufacture of dicalcium phosphate. The process is based on the nitric acidulation of phosphate rock …
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