| 摘要 |
Following the separation of bitumen from tar sands by the hot water process to produce an aqueous bitumen emulsion from which the bitumen froth is separated to leave aqueous tailings containing some incompletely separated bitumen, the incompletely separated bitumen is separated from the aqueous tailings by extraction with a solvent (e.g. naphtha) for the bitumen and can be recycled to the froth separation stage.
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