Process for the preparation of pure silicon dioxide and silicon

Details Process for the preparation of pure silicon dioxide and silicon Process for the preparation of pure silicon dioxide and silicon

1983-05-11

1984-08-14

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

502232, C01B 3312

Patent

active

044656572

ABSTRACT:
Process for preparing pure silicon dioxide from a hexafluorosilicic acid solution by controllably and vigorously admixing, stirring or blending a hexafluorosilicic acid solution with a quantity of ammonium hydroxide solution amounting to about 40 to about 75 percent by weight of the quantity stoichiometrically required for the converting hexafluorosilicic acid to ammonium fluoride and silicon dioxide to thereby form a reaction mixture and a precipitate therein; separating out this precipitate; treating the precipitate-free liquid with ammonium hydroxide and then recovering the pure silicon dioxide. The silicon dioxide is pure enough to be useful as a catalyst support or as a substitute for quartz.

REFERENCES:
patent: 3271107 (1966-09-01), Nickerson et al.
patent: 4298586 (1981-11-01), Sikdar
patent: 4308244 (1981-12-01), Sikdar et al.

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