Processes using calcined, high surface area, particulate matter,

Details Processes using calcined, high surface area, particulate matter, Processes using calcined, high surface area, particulate matter,

1984-03-20

1985-07-23

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210683, 210687, 210688, 210691, 210747, 210908, 210912, 210928, B01D 1500

Patent

active

045307652

ABSTRACT:
This invention is concerned with production and use of high surface area particulate matter by calcining a charge of clay mineral, feldspar, zeolite, coal ash, fly ash, pozzolan or volcanic ash for a time to develop fractures which increase the surface area of the particles. Vacuum calcining decreases the calcining time. The calcined matter desirably has an analysis including: calcium oxide, about 20-40 weight %; aluminum oxide, about 15-35 weight %; and silicon oxide, about 20-40 weight %.
The calcined particulate matter can be used in the treatment of impure aqueous materials; the matter is denser than water and sludge settles rapidly and completely. The calcined matter interacts with heavy metal ions to form tightly bound sludge that is nonhazardous for landfill disposal. The calcined matter can be combined with conventual coagulants, flocculants, filter aids, or activated carbon to obtain a multipurpose treating agent.
The calcined particulate matter can be combined with exotic waste water treating agents obtaining results not attainable by these exotic agents alone. The exotic agents are borohydride, dialkyldithiocarbamates where alkyl has 1-5 carbon atoms and `carbamate` has alkali metal or ammonium, dithionites, glycine, hydrazine salts, metabisulfites, polygalacturonic acid, water soluble sulfides and sulfites, and cellulose and starch xanthates.

REFERENCES:
patent: 3783128 (1974-01-01), Thompson
patent: 3998756 (1976-12-01), Sutherland

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