Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1979-11-20
1981-08-04
Wyse, Thomas G.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
208 11LE, B01D 2101, C02F 152
Patent
active
042821037
ABSTRACT:
The hot water extraction process for recovering bitumen from tar sand produces a large volume of solids-laden aqueous tailings as a waste product. The solids in the tailings stream may be flocculated by the addition of time and the components of the stream then separated into a water-free solids phase and a clarified water phase. During flocculation, the zeta potential of the stream is monitored. It rises from an initial negative zeta potential, as the lime is added. Flocculation is terminated when the zeta potential is about zero. At this point, the tailings are in optimum condition for separation into the water-free solids phase and the clarified water phase. Separation is preferably effected by vacuum filtration.
REFERENCES:
patent: 3399133 (1968-08-01), Gerdes et al.
patent: 3502575 (1970-03-01), Hepp et al.
patent: 4225433 (1980-09-01), Liu
Fuhr Bryan J.
Liu Joseph K.
Canada-Cities Service, Ltd.
Esso Resources Canada Ltd.
Gulf Canada Resources Inc.
Her Majesty the Queen in right of the Province of Alberta, Gover
Johnson E. P.
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