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

25

C

53/328, 204/74

C25C 1/16 (2006.01)

Patent

CA 1166022

ABSTRACT OF THE DISCLOSURE A process for recovering zinc from zinc-containing sulphidic material which also contains iron and lead and/or silver includes leaching the material under oxidizing con- ditions at a temperature in the range of from about 130 to about 155°C in aqueous sulphuric acid solution with a stoichiometric excess of sulphuric acid relative to the zinc content of the material of from about 50 to about 100% to produce an undissolved residue containing a major proportion of the lead and/or silver and a leach solution containing a major proportion of the zinc and iron. The residue is separated from the leach solution, the residue is treated to recover values of lead and/or silver, and the leach solu- tion is treated to recover zinc, by feeding the solution to another process in which zinc-containing material is treated to recover zinc and which includes an iron-precipitation step.

378074

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