Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Patent
1983-07-18
1989-05-23
Doll, John
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
75101R, 75115, 75120, 423109, 423110, C22B 1900, C01G 500, C01G 2100, C01B 1702
Patent
active
048329258
ABSTRACT:
A process for the recovery of zinc from zinc-containing sulphidic material which also contains iron and from zinc oxide containing material, at least one of the materials containing lead and/or silver values. The process includes leaching zinc-containing sulphidic material and zinc oxide containing material under pressurized oxidizing conditions at a temperature in the range of from about 130.degree. to about 170.degree. C. in aqueous sulphuric acid solution with a stoichiometric excess of sulphuric acid relative to the zinc content of the materials of from about 40 to about 100% to produce a residue containing a major proportion of lead and/or silver values and a leach solution containing a major proportion of the zinc and iron. The residue is separated from the leach solution and treated to recover lead and/or silver values. The pH of the solution is then raised to neutralize the acid in an iron removal step to cause precipitation of at least some of the dissolved iron from the leach solution as an iron compound. The precipitated iron compound is separated from the remaining leach solution, and the remaining leach solution is treated to recover zinc.
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"Oxidative Pressure Leaching of Zinc Concentrates", E. G. Parker, CIM Bulletin, May 1981.
Doyle Barry N.
Masters Ian M.
Weir Donald R.
Delbridge Robert F.
Doll John
Fors Arne I.
Russel Jeffrey Edwin
Sherritt Gordon Mines Limited
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