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Hydrophobic solids are known to occur in the fine tailings produced during bitumen extraction at both the Syncrude and Suncor oil sands plants. Removal of these solids, and associated residual bitumen, produces changed settling behaviour and subsequent dewatering of the remaining tailings. In this work a fractionation scheme has been developed that allows this hydrophobic component to be separated...
Laboratory agglomeration-flotation tests were used to evaluate the recovery of residual bitumen from a sample of Suncor oil sands fine tailings, using ground coal as a bitumen absorbent. To improve its effectiveness, the coal was preconditioned with no. 2 fuel oil, subjected to 30 s high-shear mixing and collected by flotation over 3 min. This oil-conditioned coal was then contacted with mature...
Surface characterization techniques (scanning electron microscopy and X-ray photoelectron spectroscopy) were used to examine toluene-insoluble solids from coprocessing of coal and heavy oil in order to evaluate their physical separation potential. Washability studies, using float-sink tests, were also carried out to provide an empirical estimate of the ash separation attainable. On the basis of...
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