Process of treating contaminated soils

Details Process of treating contaminated soils Process of treating contaminated soils

1991-12-06

1993-06-29

Lithgow, Thomas M.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210768, 210804, 210908, 210909, 210922, 210806, 134 10, 134 251, 134 40, 209 10, 241 20, 241 21, 241 24, 252 61, B01D 17035, B03D 102, B08B 304, B09B 500

Patent

active

052231470

ABSTRACT:
Contaminated soils are treated in that an aqueous slurry of the soil is separated into a coarse fraction and a fine fraction, the fine fraction is subjected to flotation, the resulting froth is dewatered and then carried away as a pollutant concentrate, and the underflow from the flotation is dewatered and is then carried away as purified soil. An emulsified oily vegetable oil is used as a collector agent for the selective flotation or an emulsified light mineral oil is used as a collector agent for the selective flotation and a light mineral oil is stirred as a conditioning agent into the fine fraction before it is subjected to the selective flotation.

REFERENCES:
patent: 4336136 (1982-06-01), Giguere
patent: 4392892 (1983-07-01), Wagner
patent: 4424081 (1984-01-01), Giguere
patent: 4732666 (1988-03-01), Welgemoed
patent: 4737273 (1988-04-01), Snow
patent: 4783263 (1988-11-01), Trost
patent: 4851123 (1989-07-01), Mishra
patent: 4923125 (1990-05-01), Bateson
patent: 4969775 (1990-11-01), Cappel
patent: 5019245 (1991-05-01), Ignasiak
patent: 5056541 (1991-10-01), Schade

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