Sprayable precipitating silica suspension

Details Sprayable precipitating silica suspension Sprayable precipitating silica suspension

C - Chemistry, Metallurgy

09

K

6/226

C09K 3/00 (2006.01) C01B 33/193 (2006.01)

Patent

CA 1061056

ABSTRACT OF THE DISCLOSURE The present invention provides a process for producing a sprayable highly concentrated precipitating silica suspension which has a low grit content and contains 12%, preferably more than 18% of solids, which comprises continuously feeding a silica filter cake and a dispersing agent by means of feed members into a dissolver tank while maintaining a pH value of not more than 4, and stirring the mixture in said tank by means of a stirring dissolver, the ratio of the tank diameter to the dia- meter of the stirring dissolver being 3:1, the maximum ratio of dissolver tank diameter to height of filling of the tank being 1:2, and at least 1.5 to 2 kg of silica suspension being present in the tank per 1 kg of silica filter cake fed therein, said stirring being carried out by the dissolver at a peripheral speed of 20 to 30 metres per second, the silica filter cake and dispersing agent being withdrawn from a zone of maximum turbu- lence by a separating member or a mixer.

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