Abstract
Water recycle is an essential part of the hot water process for bitumen recovery from tar sands. The current investigation was primarily designed to evaluate the direct recycle of process water after separation of coarse sand particles. Representative Whiterocks tar sand samples were used in all experiments. Tar sand tailings, after bitumen air flotation, were left 10 min for sedimentation, and the supernatant containing 4–5 wt% suspended matter was used in hot water batch experiments with 8 kg tar sand feed. For the processing conditions used (temperature 50–60 °C, pH at digestion < 9.5, recycled water) it was found that complete water recycle had no deleterious effect on the separation efficiency after six cycles.
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