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Aug 22, 1978· The concentration of phosphoric acid based on the amount of P 2 O 5 is generally from about 15 to 54% with the preferred concentration being 25 to 40%. As noted, the phosphoric acid can be recycled as discussed herein and it is possible to recycle one to three tons of phosphoric acid per ton of rock phosphate.
Their phosphoric acid processes, however, are capable of producing an acid of far higher quality than that normally associated with fertilizer grade acid. Unground phosphate rock is fed into the first of a series of three dissolvers along with recycle HCl, a portion of the HCl feed, and CCD wash water.
When phosphate rock is leached with hydrochloric acid, radium can be removed by coprecipitation with and uranium by extraction with a 5% solution of tributyl phosphate in hexane or ...
Key words: Phosphate rock, Phosphoric acid, Fertilizers, Phosphate salts, Wet process ABSTRACT Phosphate rocks are the commercial source used as raw material for m anufacturing phosphoric acid, phosphate fertilizers and certain other chemicals. Phosphate rocks can be used directly in some applications, whereas beneficiation is required to ...
The wet process constitutes the addition of concentrated sulfuric acid (93%) to fluorapatite (phosphate rock), and the consecutive vigorous mixing of the two substances (University of York, 2013). Important to know, fluorapatite (Ca3(PO4)2) is the basis of phosphoric acid as this is the reactant that contains phosphate; a key component in ...
Phosphate ions have a 3 charge and can combine with one proton (H+) to make hydrogen phosphate ions with a 2 charge, two protons to make dihydrogen phosphate ions with a 1 charge or three protons to make a neutral molecule called phosphoric acid. So phosphoric acid is the molecule H3PO4.
May 01, 2002· Comparison between acidulation by sulfuric acid and by phosphoric acid for Saudi phosphate rock. Fertilizer Research 1991, 29 (2), 209227. DOI: /BF. Yeong Koo Yeo, Young Sang Cho, Woo Hyun Park, Bong Kyu Moon. Simulation of the dihydrate process for the production of phosphoric acid.
Phosphate rock + Nitric acid à Phosphoric acid + Calcium nitrate + Hydrofluoric acid. Manufacturers often mix the resulting phosphoric acid with other nutrients to form compound fertilizers containing several nutrients in a single pellet. They sell the cogenerated calcium nitrate or calcium ammonium nitrate separately as independent products.
When this meta phosphoric acid is heated with water, it forms orthophosphoric acid which is commonly called as phosphoric acid. HPO 3 + H 2O H 3 PO ... Rock phosphate 16 % P 2O 5 1418 % P 2O 5 3040 % P 2O 5 2. 3Concentrated SP 2. Dicalcium phosphate 2. Raw bone meal 48 % P 2O 5 34 38 % P 2O 5 2025 % P 2O 5 3. Ammonium phosphate 3. Rhenania ...
Idaho and Utah. Marketable product refers to beneficiated phosphate rock with phosphorus pentoxide (P2O5) content suitable for phosphoric acid or elemental phosphorus production. More than 95% of the phosphate rock mined in the United States was used to manufacture wetprocess phosphoric acid and superphosphoric acid, which were used as
WengfuKailin will become the third largest phosphate producer globally, in phosphoric acid and phosphate rock terms, behind OCP and Mosaic. Both companies mine sedimentary deposits in Guizhou province, with Kailin''s underground Kaiyang mine the largest in China at 9Mt. Rock from all three mines is beneficiated to 3233% P2O5, a higher quality ...
Phosphate rock cannot be used as a fertiliser because it is insoluble but it can be used to make fertilisers. ... (a mixture of calcium sulfate and calcium phosphate) Phosphoric acid: Triple ...
Phosphate rock, when used in an untreated form, is not very soluble and provides little available phosphorus to plants, except in some moist acidic soils. Treating phosphate rock with sulfuric acid produces phosphoric acid, the watersoluble material from which most phosphate .
CHANHEN owned large phosphate mine LAOHUDONG phosphate mine located at Weng''an county Guizhou province, the mining area is square kilometers, the ore body length is kilometers, theaverage thickness is 26m, total reserves is 365 million tons, the average gradeis 27%; associated fluorine resource is 6 million tons, iodine resources is 6200 tons.
Phosphoric acid is produced by reacting sulfuric acid (H 2 SO 4) with naturally occurring phosphate rock. The phosphate rock is mined, dried, crushed until 60–70% of the rock is less than 150 μm in diameter, and then continuously fed into the reactor along with sulfuric acid.
The present invention relates to a method for preparing phosphate and phosphorous acid by using hydrochloric acid to decompose phosphate ore, which solves the problems of separation and pollution discharge existing in the technology of decomposing phosphate ore by hydrochloric acid. The method comprises a circulation process, and has the core that in the process of preparing phosphate solution ...
When phosphate rock is treated with sulphuric acid in sub stoichiometric quantity, normal superphosphate is formed. If more sulphuric acid is added, a mixture of phosphoric acid and gypsum (calcium sulphate) is obtained. After the gypsum is filtered out, the resultant phosphoric acid can be treated to recover uranium. The basic reaction is:
phosphate rock with sulfuric acid or phosphoric acid. The acidulation process converts the highly insoluble phosphate in mineral apatite into forms which are available to plants, such as monocalcium phosphate an£^ dicalcium phosphate CaHPO^. "When phosphate rock is treated with sufficient acid.
May 15, 2008· The dihydrate process for the production of phosphoric acid is increasingly important as the basis for phosphate fertilizer plants. The process involves dissolution of phosphate rock in an aqueous mixture of phosphoric and sulfuric acid and subsequent crystallization of calcium sulfate dihydrate from the product phosphoric acid solution.
The process involves acidifying phosphate rock with nitric acid to produce a mixture of phosphoric acid and calcium nitrate. Ca 3 (PO 4) 2 + 6 HNO 3 + 12 H 2 O → 2 H 3 PO 4 + 3 Ca(NO 3) 2 + 12 H 2 O. The mixture is cooled to below 0 °C, where the calcium nitrate crystallizes and can be separated from the phosphoric acid.
Phosphoric acid is produced from fluorapatite, known as phosphate rock, 3Ca 3 (PO 4) 2, by the addition of concentrated (93%) sulfuric acid in a series of wellstirred reactors. This results in phosphoric acid and calcium sulfate (gypsum) plus other insoluble impurities.
Mar 05, 2018· The wet process involves the production of phosphoric acid from fluorapatite. It is known as phosphate rock and the chemical composition is 3Ca 3 (PO 4) 2. This phosphate rock is finely ground to increase the surface area and is reacted with concentrated sulfuric acid that gives phosphoric acid and gypsum (CaSO 2 O) as products.
Phosphate rock of 70 to 75% BPL, or as high as is reasonably obtainable, is finely ground in a ball mill and then mixed with cooled recycled phosphoric acidgypsum slurry in a digestion tank (Figs. and ).At this stage the only reaction which occurs is between acid and any carbonates present in the rock, and between phosphates and low concentrations of sulfuric acid which may be ...
Phosphoric acid is a colorless, clear and odorless liquid. It is a strong inorganic acid with the chemical formula H3PO4. It can be produced by absorbing phosphorous pentoxide directly in water or through the digestion of phosphate rock with sulfuric acid. The most common form of phosphoric acid is an 85 percent aqueous solution.
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