Recovery of fumed SiO.sub.2

Details Recovery of fumed SiO.sub.2 Recovery of fumed SiO.sub.2

1980-12-04

1985-04-02

Bernstein, Hiram H.

Chemistry: physical processes

Physical processes

Agglomerating

423336, 423337, C01B 3312

Patent

active

045085382

ABSTRACT:
A method of recovering fumed hydrophobic SiO.sub.2, produced by the flame hydrolysis of a ternary azeotrope of H.sub.2 SiF.sub.6, HF, and H.sub.2 O, is disclosed. The method involves passing the fumed hydrophobic silica, as it leaves the combustion chamber, through a nonclassifying agglomerator at a residence (travel) time of from about 0.5 to several seconds, preferably about 1.0 to about 5.0 seconds, then separating the fumed silica from the product stream in a cyclone separator or other means for collecting dispersoids.

REFERENCES:
patent: 3043660 (1962-07-01), Hughes
patent: 3233969 (1966-02-01), Heller
patent: 3269799 (1966-08-01), Guma
patent: 3284167 (1966-11-01), Heller
patent: 3645684 (1972-02-01), De Cuir

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