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Surface processes at a polymetallic (Mn-Fe-Pb) sulfide subject to cyanide leaching under sonication conditions and with an alkaline pretreatment: Understanding differences in silver extraction with X-ray photoelectron spectroscopy (XPS)

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dc.contributor.author Larrabure, G. es_PE
dc.contributor.author Chero-Osorio S. es_PE
dc.contributor.author Silva-Quiñones D. es_PE
dc.contributor.author Benndorf C. es_PE
dc.contributor.author Williams M. es_PE
dc.contributor.author Gao F. es_PE
dc.contributor.author Gamarra C. es_PE
dc.contributor.author Alarcón A. es_PE
dc.contributor.author Segura C. es_PE
dc.contributor.author Teplyakov A. es_PE
dc.contributor.author Rodriguez-Reyes J.C.F. es_PE
dc.date.accessioned 2024-05-30T23:13:38Z
dc.date.available 2024-05-30T23:13:38Z
dc.date.issued 2021
dc.description.abstract Leaching of polymetallic sulfides is often challenging due to the complexity of these systems. The main issues are related to the formation of surface by-products or to the presence of different metals that require a greater consumption of chemicals compared to that needed to extract the target metal during leaching. This latter case is followed in the present work using X-ray photoelectron spectroscopy (XPS) during the leaching of a silver-containing polymetallic (Mn-Fe-Pb) sulfide under three different cyanidation procedures: (1) conventional leaching, (2) ultrasound-assisted leaching, and (3) leaching of a sample pretreated in alkaline media. In all cases, leaching results in the build-up of Pb compounds (oxides/hydroxides) on the surface of the minerals, suggesting a mechanism in which Pb is first leached by hydroxide and cyanide and later is re-adsorbed as an external layer on the minerals. On the other hand, the effect of each process on Mn was quite distinct: 1) Conventional leaching leads to the oxidation of the sulfide (pyrite) surface and a slight increase of surface Mn species; 2) Ultrasound-assisted leaching decreases surface Mn by dissolving oxidized species, which exposes fresh sulfide surfaces and increases Ag extraction; and 3) An alkaline pretreatment at high temperature exposed fresh sulfide surfaces and decreased the surface concentration of Mn. The fact that ultrasound-assisted leaching and leaching after an alkaline pretreatment allow for a higher Ag extraction (60% and 75% of total Ag, respectively, as opposed to the 25% extracted via conventional leaching), indicates that leaching is more efficient if the surface is not oxidized and if Mn is removed from the samples, either before or during leaching. © 2020 Elsevier B.V.
dc.description.sponsorship Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concytec
dc.identifier.doi https://doi.org/10.1016/j.hydromet.2020.105544
dc.identifier.scopus 2-s2.0-85098546524
dc.identifier.uri https://hdl.handle.net/20.500.12390/2385
dc.language.iso eng
dc.publisher Elsevier B.V.
dc.relation.ispartof Hydrometallurgy
dc.rights info:eu-repo/semantics/openAccess
dc.subject XPS
dc.subject Cyanide es_PE
dc.subject Leaching es_PE
dc.subject Polymetallic es_PE
dc.subject Pretreatment es_PE
dc.subject Sonication es_PE
dc.subject Sulfide es_PE
dc.subject Surface analysis es_PE
dc.subject Ultrasound-assisted es_PE
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.04.0
dc.title Surface processes at a polymetallic (Mn-Fe-Pb) sulfide subject to cyanide leaching under sonication conditions and with an alkaline pretreatment: Understanding differences in silver extraction with X-ray photoelectron spectroscopy (XPS)
dc.type info:eu-repo/semantics/article
dspace.entity.type Publication
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