Selective leaching of lead from a lead-silver-zinc concentrate with hydrogen peroxide in citrate solutions

R. Zárate-Gutiérrez, L. Gregorio-Vázquez, G. T. Lapidus

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Abstract

© 2015 Canadian Institute of Mining, Metallurgy and Petroleum. 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 be24 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.
Original languageAmerican English
Pages (from-to)305-309
Number of pages5
JournalCanadian Metallurgical Quarterly
DOIs
StatePublished - 1 Jul 2015
Externally publishedYes

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