Method of production of high purity fusible silica

Details Method of production of high purity fusible silica Method of production of high purity fusible silica

1990-01-25

1991-07-02

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423339, 423471, 65 181, C01B 2120

Patent

active

050284070

ABSTRACT:
A method of producing a high purity silica powder which can be fused to form transparent, bubble-free particles. An ammonium fluosilicate solution is purified preliminarily by removing colloidal-sized silica onto which impurities in the solution have been adsorbed. The high purity powder is produced by ammoniation of an unsaturated aqueous solution of ammonium fluosilicate. Silica powder produced is filtered, washed, and dried before fusion. Additional pre-fusion treatments such as washing, hydrothermal leaching, calcination, and a combination thereof, may be utilized to ensure that the concentration of volatile material is low.

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Hackh's Chemical Dictionary, Fourth Edition, p. 299.

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