Method for porifying fine particulate silica

Details Method for porifying fine particulate silica Method for porifying fine particulate silica

1997-04-29

1999-01-05

Jones, Deborah

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423336, C01B 3312

Patent

active

058558608

ABSTRACT:
Crude fumed silica resulting from pyrogenic hydrolysis is purified by continuously feeding particulate silica and steam or a mixture of steam and air in a steam/air volume ratio of at least 1/2 through an upright column from its bottom toward its top for forming a fluidized bed within the column at a gas linear velocity of 1 to 10 cm/sec. and a temperature of 250.degree. to 400.degree. C., whereby steam deprives the particulate silica of the halide borne thereon, and removing fine particulate silica from which the halide has been eliminated from the top of the column. Using a simple apparatus, pure fine particulate silica is collected at a low cost of energy consumption.

REFERENCES:
patent: 3043659 (1962-07-01), Hughes et al.

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