Methods for removing contaminants from contaminated solids (I)

Details Methods for removing contaminants from contaminated solids (I) Methods for removing contaminants from contaminated solids (I)

1991-11-25

1993-07-20

Morris, Theodore

Cleaning and liquid contact with solids

Processes

Work handled in bulk or groups

134 42, 134 10, 241 21, B08B 308, B08B 700

Patent

active

052289214

ABSTRACT:
A method of removing halogenated organic contaminants from contaminated solids in which the solids are comminuted as necessary to resolve them into particles with a top size of typically not more than 15 cm. The particulate solids are slurried with a contaminant extraction agent which is a mixture of an alcohol solvent, an alkali hydroxide, and a sulfoxide catalyst in an environment which results in contaminant(s) being scrubbed from the solids particles larger than 2 mm can then be separated out and processed separately, typically by surficial cleaning. A slurry of the remaining particles and the contaminant extraction agent is agitated for a period which is sufficiently long to separate additional contaminant(s) from the smaller sized particles. The slurry is thereafter resolved into a predominantly liquid phase containing fines and one or more less contaminated, separately treatable fractions in which solids predominate.

REFERENCES:
patent: 4447541 (1984-05-01), Peterson
patent: 4574013 (1986-03-01), Peterson

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