Production of silica and fluorine-containing coproducts from flu

Details Production of silica and fluorine-containing coproducts from flu Production of silica and fluorine-containing coproducts from flu

1988-07-22

1990-04-10

Stoll, Robert L.

Chemistry: physical processes

Physical processes

Crystallization

423339, 423357, 423470, 423471, 423490, 423499, C01D 324

Patent

active

049157051

ABSTRACT:
A process for producing high grade silica and fluorine-containing coproducts from fluosilicic acid is described. To produce silica, the fluosilicic acid is reacted with aqueous ammonia to produce a solid silica product and a solution of ammonium fluoride. The solid silica is washed under controlled conditions and further processed to produce a high grade product. The ammonium fluoride solution is concentrated and sold as a concentrated ammonium fluoride solution product or reacted with metal hydoxides or oxides to produce metal fluorides.

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