Method for cleanup of contaminated sandy soils and recovery...

Details Method for cleanup of contaminated sandy soils and recovery... Method for cleanup of contaminated sandy soils and recovery...

B - Operations, Transporting

03

B

B03B 9/02 (2006.01) B09C 1/02 (2006.01)

Patent

CA 2216063

A method is provided for cleanup of the fine fraction (<= 1.0 mm) of sandy soils contaminated with heavy oil/ bitumen, chlorides and heavy metals and for recovery of heavy oil/ bitumen from aqueous slurries of these soils. The method includes the steps of screening the sandy soil, preparing hot aqueous slurry of prescreened soil, screening and heating the slurry in a slurry heater, separating oily froth and contaminated process water from the slurry of precleaned sandy soil and thickening the precleaned sandy soil in a separating/thickening vessel followed by reprocessing the thicken slurry of precleaned sandy soil. Reprocessing generates some additional quantities of residual oily froth and contaminated process water from the sandy oil which is washed with fresh water, dewatered and renders sandy soil that meets the criteria for agricultural soil in Canada.

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