| 摘要 |
PCT No. PCT/NO97/00099 Sec. 371 Date Oct. 16, 1998 Sec. 102(e) Date Oct. 16, 1998 PCT Filed Apr. 16, 1997 PCT Pub. No. WO97/38805 PCT Pub. Date Oct. 23, 1997There is described a process for cleansing contaminants, such as oil, PCB, PAH, heavy metals and the like, from a heterogeneous material, such as sand, gravel, earth, oil gravel, asphalt, drill borings ("kaks") and the like. More specifically the invention relates to a process comprising the steps: i) that a sorption agent is added to the material, and that the material and the sorption agent are mixed/kneade sufficiently for a considerable portion of the contamination to be extracted from the material and absorbed by the sorption agent, and that ii) thereafter the sorption agent is separated from the material on the basis of specific gravity/particle size by means of an applied flow of gas, so that the sorption agent is led with the flow and can be collected in a separate fraction.
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