Treatment of oil sands slimes and modified bitumen recovery...

Details Treatment of oil sands slimes and modified bitumen recovery... Treatment of oil sands slimes and modified bitumen recovery...

C - Chemistry, Metallurgy

10

G

196/24

C10G 1/04 (2006.01)

Patent

CA 1138361

ABSTRACT OF THE DISCLOSURE Slimes from the slimes pond formed from the tailings stream of a hot water process for recovery of bitumen from oil sands is treated to effect separation of bitumen, clay and aqueous phases therefrom by a controlled two-stage addition of slaked lime thereto. The first slaked lime addition is used to form a water-in-oil emulsion from the bitumen and the second slaked lime addition is used to effect flocculation of the clay suspension following separation of the water-in-oil emulsion. The tailings' stream from a hot water process is treated in similar manner to avoid the formation of slimes. In another modification of the hot water process, the middlings stream from the primary separation step is mixed with slaked lime prior to passage to the flotation scaven- ging operation in order to improve the separation of bitumen from the aqueous phase. The bitumen-free tailings stream which results is readily dewatered using further slaked lime addition settling.

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