Method of producing granular amorphous silica

Details Method of producing granular amorphous silica Method of producing granular amorphous silica

C - Chemistry, Metallurgy

09

C

C09C 1/28 (2006.01) B01J 2/00 (2006.01) C01B 33/193 (2006.01) C09C 1/30 (2006.01) C09C 3/10 (2006.01)

Patent

CA 2139060

A method of directly precipitating a spherical amorphous silica in a high yield by adding a carboxymethyl cellulose (CMC) as a coagulation growing agent in a step of neutralizing the alkali silicate with an acid. The CMC having a particular etherification degree and a particular polymerization degree is added in an amount of from 1 to 100 by weight reckoned as SiO2 with respect to silica in the alkali silicate, whereby the whole silica particles turn into spherical amorphous silica particles having high sphericalness. There can be obtained spherical amorphous silica particles having a BET specific surface area of from 25 to 800 m2/g, an apparent specific gravity of from 0.1 to 0.8 and a particle diameter of from 0.2 to 50 µ m cheaply and in a high yield.

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