PHOSPHORIC ACID.pdf - ACID INDUSTRY Phosphoric Acid 1 Raw...

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1Phosphoric AcidACID INDUSTRY
2Raw Materials for Phosphoric Acid Production Phosphate ores are of two major geological origins:Igneous found in Kola, South Africa, Brazil, etc. Sedimentary found in Morocco, Algeria, Jordan, U.S.A., etc. The phosphate minerals in both types of ore are of the apatite group, of which the most commonly encountered is the Fluorapatite CaF2.3Ca3(PO4)2Most phosphate ores have to be concentrated or beneficiated before they can be used.
3Principles of the Di-Hydrate ProcessThe tricalcium phosphate in the phosphate rock is converted by reaction with concentratedsulphuric acid into phosphoric acid and the insoluble salt calcium sulphate.Ca3(PO4)2+ 3H2SO42H3PO4+ 3CaSO4The insoluble calcium sulphate is then separated from the phosphoric acid, most usually byfiltration.The reaction between phosphate rock and sulphuric acid is self-limiting because an insoluble layerof calcium sulphate forms on the surface of the particles of the rock. This problem is kept to a

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Term
Spring
Professor
Umair Aslam
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