WhatsApp)
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.
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.
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:
When phosphate rock is dissolved in nitric acid, phosphoric acid and uranium can be selectively extracted by tertiary amyl alcohol; other impurities including the lanthanides remain in the aqueous ...
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 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 ...
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 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.
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.
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 .
Acidulation of Rock Phosphate by Hydrochloric Acid Rock phosphate, when treated with hydrochloric acid, is decomposed to give mainly phosphoric acid and chlorides of calcium, iron, magnesium, aluminum as impurities. The acidulation reaction was carried out at 52 ± 1 °C, using commercial hydrochloric acid (31%). After analysis
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.
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.
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.
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 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 ...
Ido and Ut. 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
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 CPO^. "When phosphate rock is treated with sufficient acid.
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.
Concentrated sulfuric acid (93%) is added to tricalcium phosphate rock. This is typically found in nature as the substance fluorapatite. The products of this reaction are phosphoric acid and calcium sulfate or gypsum, along with other impurities.
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 ...
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 ...
This treatment produces a very pure and more expensive phosphoric acid (frequently called white acid or furnace acid) used primarily in the food and chemical industry.. The cost of converting rock phosphate to the individual phosphate fertilizers varies with the process used.. More importantly, the processes used have no effect on the availability of Phosphorus to plants.
WhatsApp)