Cognis Corporation

Henkel Corporation

John Fast

Phillip L Mattison

Michael J Virnig

William E Fristad

Jeffrey L Narum

William E Friestad

The invention is a process and an apparatus for removing metal contamination from soil. In the method, the soil is treated to produce soil with a small particle size. The particulate soil is then separated into a coarse fraction and a fine fraction. The coarse fraction and the fine fraction are contacted with a leach solution in separate contacting zones to remove the metal contamination from the soil, the metal is removed from the leach solution and the leach solution recycled to the leaching zones.

Method and apparatus for removing metal contamination from soil

The invention is an apparatus and process for recovering metal from a solution. This apparatus is a structure having an anode formed from a plurality of reducing metal elements and a cathode formed from a high surface area electrically conductive material such as metal wire. The reducing metal elements of the anode have a more negative standard state reduction potential than the metal to be recovered. This invention is also a process in which a metal is recovered by contacting a solution of a metal to be recovered with the apparatus of the invention.

Apparatus and process for recovering metal from an aqueous solution

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Littleton, CO, United States of America

John Fast