Method for treating oil sands extraction plant tailings

Details Method for treating oil sands extraction plant tailings Method for treating oil sands extraction plant tailings

C - Chemistry, Metallurgy

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C10G 1/00 (2006.01) B01D 21/00 (2006.01) B03B 9/02 (2006.01) B03D 1/016 (2006.01) B03D 3/06 (2006.01) B09B 1/00 (2006.01) C02F 1/52 (2006.01) C02F 11/12 (2006.01) C10G 1/04 (2006.01)

Patent

CA 1154702

ABSTRACT OF THE DISCLOSURE Tailings from an oil sands hot water process extraction plant are mixed with hydrolyzed starch flocculant and transferred to a settling pond. After a residence period on the order of one year, sludge from the lower region of the settling pond is with- drawn, mixed with a hydrolyzed starch dewatering agent and trans- farred to a collecting pond. After a residence period on the order of one week, partially dewatered sludge is withdrawn, mixed with sand, and deposited in a terminal disposal area, the sand in the mixture there effecting an internal surcharge to obtain further dewatering. The hydrolyzed starch additives are obtained by the aqueous hydrolysis of a starch in the presence of one or more metal salts.

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