Recovery of heavy bitumen in tar sands processing process

Details Recovery of heavy bitumen in tar sands processing process Recovery of heavy bitumen in tar sands processing process

B - Operations, Transporting

03

B

196/19

B03B 9/02 (2006.01) C10G 1/04 (2006.01)

Patent

CA 1275063

ABSTRACT Abnormal tar sands containing transitional metals which do not give acceptable bitumen recovery levels when subjected to the usual flotation process are susceptible to significantly improved bitumen recovery by weakening the polar interactions between bitumen and clay minerals in the tar sands. An effective means for improving bitumen recovery is by oxidation or by reduction of the pH of the hot water extraction mass to a pH below 7.5 and addition of alkali metal silicate or posphate solution.

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