Process for the production of phosphoric acid and hydrogen fluoride from phosphate rock and fluosilicic acid
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United States of America Patent
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Jan 19, 1993
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app pub date -
Dec 17, 1991
filing date -
Dec 31, 1990
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Abstract
Fluosilicic acid is reacted with phosphate rock in order to produce wet process phosphoric acid and calcium fluoride which is later reacted with sulfuric acid to produce hydrogen fluoride and calcium sulfate. The hydrogen fluoride is then stripped from the phosphoric acid and recovered as either anhydrous hydrogen fluoride or concentrated hydrofluoric acid or reacted aluminum trihydrate to produce aluminum fluoride; with sodium carbonate to produce sodium fluoride/bifluoride; or with ammonia to produce ammonium fluoride/bifluoride.
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