Recovery of zinc from zinc-containing sulphidic material

Details Recovery of zinc from zinc-containing sulphidic material Recovery of zinc from zinc-containing sulphidic material

C - Chemistry, Metallurgy

22

B

53/328

C22B 19/00 (2006.01) C01B 17/027 (2006.01) C01G 5/00 (2006.01) C01G 21/00 (2006.01) C22B 3/00 (2006.01)

Patent

CA 1195846

ABSTRACT OF THE DISCLOSURE A process for recovering zinc from zinc-contain- ing sulphidic material also containing iron and from zinc oxide containing material. Zinc-containing sulphidic material is leached under pressurized oxidizing conditions at a temperature in the range of from about 130 to about 170°C in aqueous sulphuric acid solution with an initial stoichiometric excess of sulphuric acid relative to the zinc content of the sulphidic material to form a leach slurry containing dissolved zinc and iron. The leach step is continued until a substantial amount of zinc has been dissolved from the sulphidic material. Zinc oxide containing material is then injected into the leach slurry, while maintaining the pressurized oxidizing conditions and temperature to raise the pH of the slurry to a value in the range of from about 4.5 to about 5.5 to precipitate dis- solved iron and form an iron-containing residue and a rela- tively iron-free leach solution. The residue is separated from the leach solution, and the leach solution is treated to recover zinc.

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