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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.
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 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.
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 ...
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 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 ...
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.
Table of ContentsPhosphoric Acid SamplesDEPATOPO ProcessProcess DemonstrationPhase separationThe OPPA Process Phosphate rock, which is a prime source of phosphate used in fertilizer manufacture in the United States, contains uranium. In general, the uranium content of the rock increases with the phosphate content and most highgrade phosphate deposits (>30% P2O5) .
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.
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 ...
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.
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.
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 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 ...
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 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.
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 ...
Nov 29, 2019 single super phosphate or superphosphate of lime, Ca(H 2 PO 4 ) 2, is a compound produced by treating rock phosphate with sulfuric acid or phosphoric acid, or a mixture of the two. Sulfuric acid is used as a key first step in the production of both MAP and DAP, after which it is mixed with phosphate rock to produce phosphoric acid .
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 ...
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 ...
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:
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.
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.
Sulfuric Acid: This acid is produced at phosphate plants for use in reacting with phosphate rock to produce phosphoric acid. The heat generated off sulfuric acid production is used to power phosphate manufacturing plants and extra energy is often sold back to the area electric grid. Some sulfuric acid may be sold separately as a product.
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