Process for removing dissolved selenium values from an...

Details Process for removing dissolved selenium values from an... Process for removing dissolved selenium values from an...

C - Chemistry, Metallurgy

25

C

23/272, 204/69

C25C 1/12 (2006.01) C01B 19/00 (2006.01) C01G 3/10 (2006.01) C22B 15/00 (2006.01)

Patent

CA 1170210

ABSTRACT OF THE DISCLOSURE Dissolved selenium values are removed from an acidic aqueous copper sulphate solution by treating the solution at a temperature of at least about 140°C with a stoichiometric excess relative to the dissolved selenium of sulphur dioxide or a sulphite solution to produce a selenium-containing precipitate and dissolved cuprous copper. The temperature of the treated solution is main- tained at at least about 140°C and an oxygen containing gas is passed into the treated solution under a pressure of at least about 350 kPa to oxidize dissolved cuprous copper to dissolved cupric copper.

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