Abstract
Selective leaching of lead from a Pb–Ag–Zn concentrate with hydrogen peroxide in citrate solutions was studied at room temperature. Leaching tests were performed, varying the H2O2 concentration and the solid–liquid ratio, holding the solution pH constant at 7 and the citrate concentration at 1M. Lead extractions of 100% were achieved with four and five times the stoichiometric quantity needed to form elemental sulphur, with only a small amount of metal impurities dissolved (Ag, Zn and Fe). The lead solubility limit at those conditions was found to be ∼24 g Pb(II) L− 1. X-ray diffraction analyses of the leach residues were free of galena (PbS), while other metal sulphides, such as sphalerite (ZnS), chalcopyrite (CuFeS2) and pyrite (FeS2), were basically unaffected.
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