Means for regulating middlings fluid to the air scavenging...

C - Chemistry – Metallurgy – 10 – G

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196/23

C10G 1/04 (2006.01)

Patent

CA 1117454

MEANS FOR REGULATING MIDDLINGS FLUID TO THE AIR SCAVENGING STEP OF A HOT WATER EXTRACTION PROCESS Abstract of the Disclosure A process for separating oil from bituminous sands which comprises: A) forming a mixture of the bituminous sands and water; B) passing the mixture into a separation zone; C) settling the mixture in the separation zone in the range of 130° to 210°F to form: an upper froth layer; a middlings layer comprising water, clay, and oil; and a sand tailings layer; D) separately removing from the separation zone the oil froth layer and the sand tailings layer; E) passing a stream of middlings from the middlings layer to a middlings storage zone; F) passing a stream of middlings from the middlings storage zone to a scavenger zone and therein recovering an additional amount of oil froth; and G) removing from the scavenger zone and discarding from the system middlings material of depleted oil content comprising clay dispersed in water.

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