New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.mineng.2022.107467 http://hdl.handle.net/11449/230520 |
Resumo: | A response surface capable of describing the extraction of copper with high statistical confidence (R2 = 0.9973) was obtained using a central composite factorial design (CCD). The parameters used were the initial concentration of Fe2+ ions ([Fe2+]i) and pulp density (ρpulp). The results evidenced that chalcopyrite leaching was strongly influenced by the solution potential, which was a function of the [Fe2+]i:ρpulp ratio. The optimal parameters obtained for maximizing the copper extraction percentage were those that satisfied a [Fe2+]i:ρpulp ratio of ≈ 80 (mmol L−1/%), in the range from 200 to 398 mmol L−1 of Fe2+. The [Fe2+]i:ρpulp ratio of ≈ 80 allowed an optimal range of solution potential for most of the experiment duration, which provided a copper extraction of 91 ± 3% in 28 days, under moderate conditions. The leaching residues were analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray diffractometry (XRD), and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDS). The mathematical model, together with the calculated Nernst potentials of the main oxidation–reduction reactions of chalcopyrite, indicated that the copper extraction was governed by experimental conditions that favored chalcopyrite reduction coupled with the chalcocite oxidation reaction. Hypotheses to explain the reasons for certain experimental conditions that could increase or decrease chalcopyrite dissolution were formulated and are extensively discussed. These findings contribute to the development of new routes for the processing of chalcopyrite mineral. |
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New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial designChalcopyriteDissolution optimizationLeachingRedox potentialResponse surfaceA response surface capable of describing the extraction of copper with high statistical confidence (R2 = 0.9973) was obtained using a central composite factorial design (CCD). The parameters used were the initial concentration of Fe2+ ions ([Fe2+]i) and pulp density (ρpulp). The results evidenced that chalcopyrite leaching was strongly influenced by the solution potential, which was a function of the [Fe2+]i:ρpulp ratio. The optimal parameters obtained for maximizing the copper extraction percentage were those that satisfied a [Fe2+]i:ρpulp ratio of ≈ 80 (mmol L−1/%), in the range from 200 to 398 mmol L−1 of Fe2+. The [Fe2+]i:ρpulp ratio of ≈ 80 allowed an optimal range of solution potential for most of the experiment duration, which provided a copper extraction of 91 ± 3% in 28 days, under moderate conditions. The leaching residues were analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray diffractometry (XRD), and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDS). The mathematical model, together with the calculated Nernst potentials of the main oxidation–reduction reactions of chalcopyrite, indicated that the copper extraction was governed by experimental conditions that favored chalcopyrite reduction coupled with the chalcocite oxidation reaction. Hypotheses to explain the reasons for certain experimental conditions that could increase or decrease chalcopyrite dissolution were formulated and are extensively discussed. These findings contribute to the development of new routes for the processing of chalcopyrite mineral.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Department of Biochemistry and Organic Chemistry Institute of Chemistry São Paulo State University (UNESP), SPDepartment of Analytical Physical and Inorganic Chemistry Institute of Chemistry São Paulo State University (UNESP), SPDepartment of Biochemistry and Organic Chemistry Institute of Chemistry São Paulo State University (UNESP), SPDepartment of Analytical Physical and Inorganic Chemistry Institute of Chemistry São Paulo State University (UNESP), SPUniversidade Estadual Paulista (UNESP)Rissoni Toledo, Ailton Guilherme [UNESP]Tayar, Samir Prioto [UNESP]Arena, Fabiana Antonia [UNESP]Benedetti, Assis Vicente [UNESP]Bevilaqua, Denise [UNESP]2022-04-29T08:40:37Z2022-04-29T08:40:37Z2022-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.mineng.2022.107467Minerals Engineering, v. 180.0892-6875http://hdl.handle.net/11449/23052010.1016/j.mineng.2022.1074672-s2.0-85125856737Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMinerals Engineeringinfo:eu-repo/semantics/openAccess2022-04-29T08:40:37Zoai:repositorio.unesp.br:11449/230520Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T14:19:39.327531Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design |
title |
New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design |
spellingShingle |
New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design Rissoni Toledo, Ailton Guilherme [UNESP] Chalcopyrite Dissolution optimization Leaching Redox potential Response surface |
title_short |
New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design |
title_full |
New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design |
title_fullStr |
New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design |
title_full_unstemmed |
New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design |
title_sort |
New insights into oxidative-reductive leaching of chalcopyrite concentrate using a central composite factorial design |
author |
Rissoni Toledo, Ailton Guilherme [UNESP] |
author_facet |
Rissoni Toledo, Ailton Guilherme [UNESP] Tayar, Samir Prioto [UNESP] Arena, Fabiana Antonia [UNESP] Benedetti, Assis Vicente [UNESP] Bevilaqua, Denise [UNESP] |
author_role |
author |
author2 |
Tayar, Samir Prioto [UNESP] Arena, Fabiana Antonia [UNESP] Benedetti, Assis Vicente [UNESP] Bevilaqua, Denise [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Rissoni Toledo, Ailton Guilherme [UNESP] Tayar, Samir Prioto [UNESP] Arena, Fabiana Antonia [UNESP] Benedetti, Assis Vicente [UNESP] Bevilaqua, Denise [UNESP] |
dc.subject.por.fl_str_mv |
Chalcopyrite Dissolution optimization Leaching Redox potential Response surface |
topic |
Chalcopyrite Dissolution optimization Leaching Redox potential Response surface |
description |
A response surface capable of describing the extraction of copper with high statistical confidence (R2 = 0.9973) was obtained using a central composite factorial design (CCD). The parameters used were the initial concentration of Fe2+ ions ([Fe2+]i) and pulp density (ρpulp). The results evidenced that chalcopyrite leaching was strongly influenced by the solution potential, which was a function of the [Fe2+]i:ρpulp ratio. The optimal parameters obtained for maximizing the copper extraction percentage were those that satisfied a [Fe2+]i:ρpulp ratio of ≈ 80 (mmol L−1/%), in the range from 200 to 398 mmol L−1 of Fe2+. The [Fe2+]i:ρpulp ratio of ≈ 80 allowed an optimal range of solution potential for most of the experiment duration, which provided a copper extraction of 91 ± 3% in 28 days, under moderate conditions. The leaching residues were analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray diffractometry (XRD), and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDS). The mathematical model, together with the calculated Nernst potentials of the main oxidation–reduction reactions of chalcopyrite, indicated that the copper extraction was governed by experimental conditions that favored chalcopyrite reduction coupled with the chalcocite oxidation reaction. Hypotheses to explain the reasons for certain experimental conditions that could increase or decrease chalcopyrite dissolution were formulated and are extensively discussed. These findings contribute to the development of new routes for the processing of chalcopyrite mineral. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-04-29T08:40:37Z 2022-04-29T08:40:37Z 2022-04-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.mineng.2022.107467 Minerals Engineering, v. 180. 0892-6875 http://hdl.handle.net/11449/230520 10.1016/j.mineng.2022.107467 2-s2.0-85125856737 |
url |
http://dx.doi.org/10.1016/j.mineng.2022.107467 http://hdl.handle.net/11449/230520 |
identifier_str_mv |
Minerals Engineering, v. 180. 0892-6875 10.1016/j.mineng.2022.107467 2-s2.0-85125856737 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Minerals Engineering |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1808128347876622336 |