Method of making large particle size, high purity dense silica

Details Method of making large particle size, high purity dense silica Method of making large particle size, high purity dense silica

C - Chemistry, Metallurgy

01

B

23/194

C01B 33/18 (2006.01) C01B 33/16 (2006.01) C03C 1/00 (2006.01)

Patent

CA 1318770

87-3-236 CN METHOD OF MAKING LARGE PARTICLE SIZE, HIGH PURITY DENSE SILICA Abstract: A method of making large particle size, high purity, dense silica is described. Tetraethylorthosilicate ethanol solution is added to a 2N ammonium hydroxide solution containing silicic acid having an average particle size of about 15 micrometers to form a precipitate followed by a digestion of the precipitate in the solution. The precipitate is filtered through a screen having 45 micrometer openings and dried to form a dried powder. The dried powder is then calcined in an oxygen atmosphere followed by desifying it by heating at a temperature of about 1200°C in air to form a large particle size, high purity, dense silica.

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