Selenium rejection during acid leaching of matte

Details Selenium rejection during acid leaching of matte Selenium rejection during acid leaching of matte

C - Chemistry, Metallurgy

22

B

53/276

C22B 15/00 (2006.01) C22B 3/44 (2006.01)

Patent

CA 1065142

SELENIUM REJECTION DURING ACID LEACHING OF MATTE Abstract of Disclosure A method is provided for removing trace amounts of selenium from acid leach solutions containing over 2 ppm of total selenium comprising either Se(IV) and/or Se(VI) obtained during the pressure oxidation leaching of metal sulfide con- centrate comprising forming a slurry of said acid solution with comminuted metal sulfide concentrate, said slurry con- taining at least two grams of a metal ion as metal hydroxide per liter of solution and then subjecting said slurry to agi- tation at a temperature of at least about 185°C at a pressure of at least about 160 psig, whereby to reduce the total sele- nium content of said solution to less than about 2 ppm.

246459

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