Electrochemical study of chalcopyrite dissolution in sulfuric, nitric and hydrochloric acid solutions

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dc.creatorTatiana das Chagas Almeida
dc.creatorEric Marsalha Garcia
dc.creatorHugo Walisson Alves da Silva
dc.creatorTulio Matencio
dc.creatorVanessa de Freitas Cunha Lins
dc.date.accessioned2023-09-05T16:00:11Z
dc.date.accessioned2025-09-09T00:42:42Z
dc.date.available2023-09-05T16:00:11Z
dc.date.issued2016
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.identifier.doihttps://doi.org/10.1016/j.minpro.2016.02.001
dc.identifier.issn0301-7516
dc.identifier.urihttps://hdl.handle.net/1843/58462
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofInternational Journal of Mineral Processing
dc.rightsAcesso Restrito
dc.subjectEletroquímica
dc.subjectLixiviação
dc.subjectCalcopirita
dc.subjectEspectroscopia de impedância
dc.subjectRaman, Espectroscopia de.
dc.subjectÁcido sulfúrico
dc.subjectÁcido nítrico
dc.subjectÁcido clorídrico
dc.subject.otherChalcopyrite leaching
dc.subject.otherElectrochemical impedance spectroscopy
dc.subject.otherAcid dissolution
dc.subject.otherRaman spectroscopy
dc.titleElectrochemical study of chalcopyrite dissolution in sulfuric, nitric and hydrochloric acid solutions
dc.typeArtigo de periódico
local.citation.epage33
local.citation.spage25
local.citation.volume149
local.description.resumoElectrochemical and surface analyseswere carried out to study the leaching of chalcopyrite in acidmedia, aiming to increase copper extraction from low-grade chalcopyrite ores. Unpublished results include the use of electrochemical impedance spectroscopy (EIS) to characterize the dissolution resistance of chalcopyrite surfaces in 0.1 mol·L−¹ of hydrochloric, nitric or sulfuric acids. Potentiodynamic polarization, atomic absorption spectrometry and EIS analysis showed that hydrochloric acid solutions are more efficient leaching agents than nitric and sulfuric acids. The impedance results suggested that the chalcopyrite dissolution is a diffusion-controlled process in hydrochloric and sulfuric acids. The use of Raman spectroscopy and scanning electronmicroscopywith energy dispersive spectrometers (SEM/EDS) allowed the partial identification of lead and bismuth sulfides as impurities. Two products were identified on the surface of chalcopyrite after anodic polarization, i.e., sulfur in the sulfuric acid only and covellite in all three acids.
local.identifier.orcidhttps://orcid.org/0000-0002-3731-7568
local.identifier.orcidhttps://orcid.org/0000-0002-5660-8125
local.identifier.orcidhttps://orcid.org/0000-0002-6357-9553
local.publisher.countryBrasil
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA QUÍMICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0301751616300254

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