Process for the decontamination of toxic, heavy-metal containing

Details Process for the decontamination of toxic, heavy-metal containing Process for the decontamination of toxic, heavy-metal containing

1991-12-09

1994-08-30

Brunsman, David

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 13, 134 251, 134 42, 423 22, 423 27, 423 98, 423109, 4231501, 71903, 106900, C22B 300

Patent

active

053424492

ABSTRACT:
The present invention relates to the decontamination of soil and the like and, in particular, soils which are contaminated with metal as a result of the activities of human beings. The invention provides a physical and a chemical means for treating soil aggregate so as to obtain a product aggregate having a relatively low metal content. The physical means is characterized by the classification of a soil aggregate into portions of differing size and metal content. The chemical means is characterized by contacting a soil aggregate with an aqueous lixiviant comprising an organic acid component to lift metal from the aggregate. The physical and chemical means may be used in a combined process for decontaminating soil aggregate.

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