Removal of dissolved cadmium and copper from sulphate solution with hydrogen sulfide
AssigneeSherritt Gordon Mines Limited
InventorsJack Van der Meulen, Donald R. Weir
Life of this patent
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Abstract
A process for selectively removing ions of copper and/or cadmium from a sulphate solution containing nickel and/or cobalt values. The solution is treated at a temperature in the range of from about 85.degree. to about 95.degree. C. and at a pH in the range of from about 4.5 to about 5.5 with hydrogen sulphide to precipitate copper and/or cadmium ions as copper and/or cadmium sulphide, and the precipitated copper and/or cadmium sulphide is separated from the solution.
Claims9
A process for selectively removing ions of at least one impurity metal selected from the group consisting of copper and cadmium from a sulphate solution containing nickel and/or cobalt values, comprising treating the solution at a temperature in the range of from about 85.degree. to about 95.degree. C. and at a pH in the range of from about 4.5 to about 5.5 with hydrogen sulphide to precipitate impurity metal ions as metal sulphide and separating the precipitated metal sulphide from the solution.
A process for selectively removing copper and cadmium ions from nickel and cobalt sulphate solution containing from about 0.1 to about 2 g/L copper, from about 0.05 to about 0.5 g/L cadmium, from about 40 to about 50 g/L nickel and from about 20 to about 50 g/L cobalt, comprising treating the solution at a temperature in the range of from about 85.degree. to about 95.degree. C., and at a pH in the range of from about 4.5 to about 5.5 with hydrogen sulphide to precipitate copper and cadmium sulphides, and removing the precipitated sulphides from the solution.
Dependencies are inferred from the claim text.