Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1977-03-07
1980-02-26
Meros, Edward J.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
106288B, 423158, 423179, 4232155, 423329, 423331, 423334, 423339, C01B 3326, C01B 3312
Patent
active
041906322
ABSTRACT:
There is provided a process for treating air-borne dust containing silicon dioxide in order to form a silicic acid or a silicate. The air-borne dust is dissolved in an alkali metal hydroxide solution to form an alkali metal silicate solution. The alkali metal silicate solution is purified by treating it with activated charcoal and/or oxidation agents. Non-decomposable substances remaining after the purification step are removed from the alkali metal silicate solution. The alkali metal silicate solution is then reacted with acids and/or salts of aluminum, magnesium and calcium. The resulting product is then filtered, washed and dried, and then comminuted to form a finely divided, amorphous, substantially pure, precipitated, silicic acid or silicate having a whiteness according to Berger at a wave length of 460 m.mu. of about 90 to about 95% and a specific surface area of about 30 to about 800 m.sup.2 /g BET. The resulting products are useful as reinforcing fillers in the rubber and plastics industries, as well as additives in the paint, varnish, lacquer, paper, cosmetic, pharmaceutical, feed and pesticide industries.
REFERENCES:
patent: 3017347 (1962-01-01), Kratz
patent: 3085861 (1963-04-01), Thornhill et al.
patent: 3489586 (1970-01-01), Chapman et al.
Achenbach Karl
Turk Gunter
Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
Meros Edward J.
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