Method of preparing purifying agents consisting of activated sil

Details Method of preparing purifying agents consisting of activated sil Method of preparing purifying agents consisting of activated sil

1973-07-02

1976-03-16

Martin, William D.

Coating processes

With post-treatment of coating or coating material

Heating or drying

252450, 427399, B05D 302, B05D 500

Patent

active

039446875

ABSTRACT:
A purifying agent consisting of an activated siliceous porous mineral substance and used for processing industrial waste water is prepared by impregnating a siliceous porous mineral substance containing a water insoluble metal oxide such as diatomaceous earth and foamed perlite with hydrochloric acid, sulfuric acid or a mixture thereof, and then baking the impregnated mineral substance at a temperature of from 100.degree.C to 500.degree.C thereby converting at least a portion of the water insoluble metal oxide into a water soluble metal salt.

REFERENCES:
patent: 1133446 (1915-03-01), Richter
patent: 1980569 (1934-11-01), Belden et al.
patent: 2207145 (1940-07-01), Doht
patent: 2701240 (1955-02-01), Bregar
patent: 2892800 (1959-06-01), Taipale
patent: 3202518 (1965-08-01), Whittemore
patent: 3769065 (1973-10-01), Dunn
patent: 3787330 (1974-01-01), Sugahara et al.

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