Removal of selenium from acidic copper/nickel solutions

Details Removal of selenium from acidic copper/nickel solutions Removal of selenium from acidic copper/nickel solutions

C - Chemistry, Metallurgy

01

B

23/328, 23/81, 2

C01B 19/00 (2006.01) C01B 17/96 (2006.01) C01G 3/00 (2006.01) C01G 3/10 (2006.01) C01G 53/00 (2006.01) C22B 3/44 (2006.01) C22B 15/00 (2006.01)

Patent

CA 1146723

ABSTRACT OF THE DISCLOSURE Selenium (IV) and selenium (VI) are removed from acidic copper-nickel sulphate solutions in a two-stage process by adjusting and maintaining the sulphuric acid content of the solution in a range of 10 to 50 g/L and, in a first stage, contacting the solution with sulphur dioxide or a sulphite-containing solution at an elevated temperature in the range of about 140° to 175°C and, in a second stage, maintaining the said solution at an elevated temperature in the range of about 140° to 200°C and pressure within the range of about 400 to 1750 kPa in an essentially oxygen-free atmosphere for a sufficient retention time to reduce and precipitate selenium (VI) as cuprous selenide.

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