Process for producing high-purity silica by reacting crude silic

Details Process for producing high-purity silica by reacting crude silic Process for producing high-purity silica by reacting crude silic

1990-11-14

1993-11-30

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423335, 423471, C01B 3312

Patent

active

052662896

ABSTRACT:
A process for producing a high-purity silica, which comprises the steps of reacting a crude silica with ammonium fluoride, acid ammonium fluoride or a mixture thereof in an aqueous medium to produce ammonium silicofluoride, separating the ammonium silicofluoride from an unreacted silica and impurities by the means of a solid/liquid separation, and reacting the thus-obtained ammonium silicofluoride with ammonia in an aqueous medium. This process is a low cost process, and enables to control properties of silica.

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