Recycling aerated scavenged middlings to conditioning step of ho

Details Recycling aerated scavenged middlings to conditioning step of ho Recycling aerated scavenged middlings to conditioning step of ho

1976-07-26

1977-04-19

Gantz, Delbert E.

Mineral oils: processes and products

Products and compositions

Lubricating oils

G10G 104

Patent

active

040186652

ABSTRACT:
In a hot water process for extracting bitumen from tar sands comprising forming a mixture of tar sands and water, settling the mixture in a primary extraction zone to form an upper bitumen froth layer, a middlings layer and a sand tailings layer, passing a part of the middlings layer to an air scavenger zone to recover additional bitumen therefrom, the improvement which comprises adding the aerated bitumen-depleted aerated middlings material from the air scavenger zone to the mixture of tar sands and water before the settling step.

REFERENCES:
patent: 2968603 (1961-01-01), Coulson
patent: 3392833 (1968-07-01), Baillie
patent: 3487003 (1969-12-01), Baillie et al.
patent: 3502565 (1970-03-01), Baillie
patent: 3509037 (1970-04-01), Tse
patent: 3558469 (1971-01-01), White et al.
patent: 3619406 (1971-11-01), Bowman et al.

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