Metallgesellschaft Aktiengesellschaft

Outotec Oyj

Metso Outotec Finland Oy

Jochen Guntner

Jorg Hammerschmidt

Alexandros Charitos

Maciej Wrobel

Friedrich Rosenstock

Elmar Haite

Christian Mattich

Nikola Anastasijevic

Karl-Heinz Daum

Peter Sturm

Hannes Storch

Horst Dittmann

Markus Buchmann

Franz Schulz

Ioannis Chatzilamprou

Eberhard Schmidt

Stefan Brauner

Gunnar Berg

Ake Holmstrom

Gunter Schneider

Martin Kunsch

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.

Process of treating contaminated soils

To decontaminate contaminated soil, a layer of the soil is formed on a gas-permeable support in a pressure housing, steam at a temperature from 100.degree. to 190.degree. C. and under a pressure from 1 to 12 bars is fed to the pressure housing and is passed through the layer, the vapor leaving the layer is withdrawn from the pressure housing and condensed. The condensate is purified and the solids are carried away as decontaminated soil.

Process for decontaminating contaminated soils

Growing community of inventors

St. Andreasberg, Germany

Jochen Guntner