Production of phosphoric acid and hydrogen fluoride

Details Production of phosphoric acid and hydrogen fluoride Production of phosphoric acid and hydrogen fluoride

C - Chemistry, Metallurgy

01

B

C01B 25/223 (2006.01) C01B 7/19 (2006.01) C01B 25/22 (2006.01) C01C 1/16 (2006.01) C01D 3/02 (2006.01) C01F 7/50 (2006.01) C01F 11/20 (2006.01) C01F 11/46 (2006.01)

Patent

CA 2107472

Fluosilicic acid is reacted with phosphate rock in order to produce wet process phoshoric 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 with alu- minum trihydrate to produce aluminum fluoride; with sodium carbonate to produce sodium fluoride: bifluoride; or with ammo- nia to produce ammonium fluoride/bifluoride.

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