The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 04, 1981
Filed:
Nov. 20, 1979
Bryan J Fuhr, Edmonton, CA;
Joseph K Liu, Edmonton, CA;
Petro-Canada Exploration Inc., Calgary, CA;
Her Majesty the Queen in right of the Province of Alberta, Government of, , US;
PanCanadian Petroleum Limited, Calgary, CA;
Esso Resources Canada Ltd., Calgary, CA;
Canada-Cities Service, Ltd., Calgary, CA;
Gulf Canada Resources Inc., Calgary, CA;
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.