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The raw materials of phosphoric acid are mainly phosphate rock and inorganic acid (sulfuric acid, hydrochloric acid or nitric acid, mainly sulfuric acid). Natural phosphate rocks are divided into apatite and phosphorite, and the main component is calcium fluorophosphate [CA 10F2 (PO4) 6].
The grade of phosphate rock and the types and contents of harmful impurities have great influence on the technology and economy of wet-process phosphoric acid production. The mined phosphorite generally needs to be enriched to improve its grade and remove impurities in order to meet the requirements of wet-process phosphoric acid production.
Industrial preparation method Phosphoric acid is usually prepared by the reaction of concentrated sulfuric acid with calcium phosphate in industry, and calcium sulfate precipitate slightly soluble in water is filtered out, and the obtained filtrate is phosphoric acid solution.