Process for pumping bitumen froth thorugh a pipeline

E - Fixed Constructions – 21 – C

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E21C 41/26 (2006.01) F17D 1/16 (2006.01)

Patent

CA 2220821

Average grade oil sand is mixed with water to produce a low temperature (20 - 35°C), dense (1.4-1.65 g/cc) slurry. The slurry is pumped through a pipeline for sufficient time to condition it. Air is injected into the slurry after the last pump. The slurry density is adjusted to about 1.5 g/cc by adding flood water near the end of the pipeline. The slurry is introduced into a primary separation vessel (PSV), excess air is vented from the PSV contents and a hot water underwash is used to heat the froth produced. Bitumen froth is recovered. When fed low grade oil sand, the process is modified by adding flotation aid chemicals to the slurry in the pipeline and subjecting the PSV tailings and middlings to secondary recovery with agitation and aeration in a secondary separation vessel.

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