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:
Jun. 02, 1992
Filed:
Sep. 06, 1991
Wayne B Jansen, Edmonton, CA;
Gordon R Thompson, Edmonton, CA;
Patrick D Dougan, Sherwood Park, CA;
Malcolm S Betts, Fort McMurray, CA;
Gordon R Larson, Fort McMurray, CA;
Alberta Energy Company, Limited, Calgary, CA;
Canadian Occidental Petroleum Limited, Calgary, CA;
Esso Resources Canada Limited, Calgary, CA;
Gulf Canada Resources Limited, Toronto, CA;
Her Majesty the Queen, in right of the Province of Alberta, Edmonton, CA;
HBOG-Oil Sands Limited Partnership, Calgary, CA;
PanCanadian Petroleum Limited, Calgary, CA;
Petro-Canada, Inc., Calgary, CA;
Abstract
An aperature is formed in the bottom wall of the launder. A downwardly extending container communicates with the aperture. A weir is positioned immediately downstream of the aperture. The container and weir combine to form a separator. In the launder, free water and solids contaminants settle and form a bottom layer of dirty water. The layer is diverted into the container through the aperture and the weir temporarily retains a small head of it. Temporary retention in the separator therefore generates a vertical fluid column comprising an upper layer of relatively clean froth and a lower layer of dirty water, said layers having an ascertainable interface. The elevation of the interface is monitored and contaminated fluid is withdrawn from the container as underflow at a rate controlled to keep the interface elevation substantially constant. The froth overflowing the weir is reduced in water and solids relative to the original froth issuing from the flotation vessel.