Geotechnical characteristics of tailings via lime addition

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United States of America Patent

PATENT NO 11724946
SERIAL NO

17123875

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Abstract

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Methods and systems for treating tailings at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises (i) providing a tailings stream comprising bicarbonates and a pH less than 9.0, (ii) adding a coagulant comprising calcium hydroxide to the tailings stream to form a mixture having a pH of at least 11.5 and a soluble calcium level no more than 800 mg/L, and (iii) dewatering the mixture to produce a product having a solids content of at least 40% by weight. In some embodiments, the pH and soluble calcium level of the mixture cause chemical modification of clay materials of the mixture via pozzolanic reactions. In some embodiments, the undrained shear strength of the product increases over a period of time of at least two days.

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Patent Owner(s)

Patent OwnerAddress
GRAYMONT WESTERN CANADA INC200-10991 SHELLBRIDGE WAY RICHMOND V6X 3C6

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fox, Jesse Wayne West Valley City, US 11 16
Hariharan, Narain College Station, US 11 6
Leikam, Jared Ira West Jordan, US 20 38
Romaniuk, Nikolas Andrei Edmonton, CA 15 16
Tate, Michael John Oregon, US 20 38

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