Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator.
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFOP |
Texto Completo: | http://www.repositorio.ufop.br/handle/123456789/12266 http://dx.doi.org/10.4322/2176-1523.20191551 |
Resumo: | Sodium sulfide plays a multifunctional role in sulfide minerals flotation. The restorative action of minerals surface is its main function. As pH regulator, it reacts on surface and provides the conditions for interactions between minerals-collectors. However, changes in pulp composition can affect the electrochemical conditions desirable for flotation. Thus, the purpose this study was the evaluation of electrochemical state established in flotation, involving a willemite ore bearing zinc and lead sulfide minerals, when Na2 S was used as pH regulator. So, the electrochemical potential established in the pulp, the recoveries and contents of Zn, Pb, and Ag were considered as criteria for assessing the process. The pH equal to 9 yielded the best results for recovery (95.33% Zn; 61.24% Pb; 79.01% Ag) and content (12.96% Zn; 1.54% Pb; 307.33 ppm Ag), due to the smaller interference that occurred in the electrochemical conditions of systems when compared to pH 11, also included in the evaluations. However, larger dosages of Na2 S were counterproductive due to depressant action. Decrease in the potential can be related to the excessive amount of HS- , impairing the sulfides flotation. |
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São José, Fábio deRodrigues, Otávia Martins SilvaPereira, Carlos Alberto2020-05-27T14:18:21Z2020-05-27T14:18:21Z2019SÃO JOSÉ, F. de; RODRIGUES, O. M. S.; PEREIRA, C. A. Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. Tecnologia em Metalurgia, Materiais e Mineração, São Paulo, v. 16, n. 1, p. 129-134, jan./mar. 2019. Disponível em: <https://www.tecnologiammm.com.br/doi/10.4322/2176-1523.20191551>. Acesso em: 10 mar. 2020.2176-1523http://www.repositorio.ufop.br/handle/123456789/12266http://dx.doi.org/10.4322/2176-1523.20191551Sodium sulfide plays a multifunctional role in sulfide minerals flotation. The restorative action of minerals surface is its main function. As pH regulator, it reacts on surface and provides the conditions for interactions between minerals-collectors. However, changes in pulp composition can affect the electrochemical conditions desirable for flotation. Thus, the purpose this study was the evaluation of electrochemical state established in flotation, involving a willemite ore bearing zinc and lead sulfide minerals, when Na2 S was used as pH regulator. So, the electrochemical potential established in the pulp, the recoveries and contents of Zn, Pb, and Ag were considered as criteria for assessing the process. The pH equal to 9 yielded the best results for recovery (95.33% Zn; 61.24% Pb; 79.01% Ag) and content (12.96% Zn; 1.54% Pb; 307.33 ppm Ag), due to the smaller interference that occurred in the electrochemical conditions of systems when compared to pH 11, also included in the evaluations. However, larger dosages of Na2 S were counterproductive due to depressant action. Decrease in the potential can be related to the excessive amount of HS- , impairing the sulfides flotation.O sulfeto de sódio possui um papel multifuncional na flotação de minerais sulfetados. A restauração da superfície sulfetada dos minerais é a sua principal função. Como regulador de pH, este age na superfície mineral e oferece condições para as interações entre mineral-coletor. Contudo, mudanças na composição da polpa podem afetar as condições eletroquímicas necessárias à flotação do sulfeto. Assim, o propósito deste estudo foi avaliar o estado eletroquímico estabelecido em flotação, envolvendo um minério willemítico portador de sulfetos de zinco e chumbo, quando o Na2 S foi usado como regulador de pH. Portanto, o potencial eletroquímico estabelecido na polpa mineral, as recuperações e teores de Zn, Pb e Ag foram considerados como critérios para a avaliação do processo. O pH igual a 9 permitiu os melhores resultados de recuperação (95,33% Zn; 61,24% Pb; 79,01% Ag) e teor (12,96% Zn; 1,54% Pb; 307,33 ppm Ag), devido às menores interferências nas condições químicas do sistema quando comparado ao pH 11, também incluso nos parâmetros de avaliação. Contudo, maiores dosagens de Na2 S podem ter sido deletérias como ação depressora para os sulfetos. Quedas no potencial eletroquímico podem estar relacionadas à quantidade excessiva de HS- , prejudicando a flotação.This is an open access paper, published under the Creative Commons CC BY-NC-ND license (Attribution-NonCommercial-NoDerivs) - https://creativecommons.org/licenses/ by-nc-nd/4.0/. Fonte: o próprio artigoinfo:eu-repo/semantics/openAccessElectrochemical potentialSodium sulfideSulfide mineralsPotencial eletroquímicoSulfeto de sódioElectrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator.Aspectos eletroquímicos na flotação de sulfetos de zinco-chumbo presente em minério silicatado brasileiro – uso do Na2S como modulador.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPLICENSElicense.txtlicense.txttext/plain; charset=utf-8924http://www.repositorio.ufop.br/bitstream/123456789/12266/2/license.txt62604f8d955274beb56c80ce1ee5dcaeMD52ORIGINALARTIGO_ElectrochemicalAspectsFlotation.pdfARTIGO_ElectrochemicalAspectsFlotation.pdfapplication/pdf1089670http://www.repositorio.ufop.br/bitstream/123456789/12266/1/ARTIGO_ElectrochemicalAspectsFlotation.pdf4353a157bd5f3ad6ed12f2b1dd934632MD51123456789/122662020-05-27 10:18:21.988oai:localhost: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ório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332020-05-27T14:18:21Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. |
dc.title.alternative.pt_BR.fl_str_mv |
Aspectos eletroquímicos na flotação de sulfetos de zinco-chumbo presente em minério silicatado brasileiro – uso do Na2S como modulador. |
title |
Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. |
spellingShingle |
Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. São José, Fábio de Electrochemical potential Sodium sulfide Sulfide minerals Potencial eletroquímico Sulfeto de sódio |
title_short |
Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. |
title_full |
Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. |
title_fullStr |
Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. |
title_full_unstemmed |
Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. |
title_sort |
Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. |
author |
São José, Fábio de |
author_facet |
São José, Fábio de Rodrigues, Otávia Martins Silva Pereira, Carlos Alberto |
author_role |
author |
author2 |
Rodrigues, Otávia Martins Silva Pereira, Carlos Alberto |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
São José, Fábio de Rodrigues, Otávia Martins Silva Pereira, Carlos Alberto |
dc.subject.por.fl_str_mv |
Electrochemical potential Sodium sulfide Sulfide minerals Potencial eletroquímico Sulfeto de sódio |
topic |
Electrochemical potential Sodium sulfide Sulfide minerals Potencial eletroquímico Sulfeto de sódio |
description |
Sodium sulfide plays a multifunctional role in sulfide minerals flotation. The restorative action of minerals surface is its main function. As pH regulator, it reacts on surface and provides the conditions for interactions between minerals-collectors. However, changes in pulp composition can affect the electrochemical conditions desirable for flotation. Thus, the purpose this study was the evaluation of electrochemical state established in flotation, involving a willemite ore bearing zinc and lead sulfide minerals, when Na2 S was used as pH regulator. So, the electrochemical potential established in the pulp, the recoveries and contents of Zn, Pb, and Ag were considered as criteria for assessing the process. The pH equal to 9 yielded the best results for recovery (95.33% Zn; 61.24% Pb; 79.01% Ag) and content (12.96% Zn; 1.54% Pb; 307.33 ppm Ag), due to the smaller interference that occurred in the electrochemical conditions of systems when compared to pH 11, also included in the evaluations. However, larger dosages of Na2 S were counterproductive due to depressant action. Decrease in the potential can be related to the excessive amount of HS- , impairing the sulfides flotation. |
publishDate |
2019 |
dc.date.issued.fl_str_mv |
2019 |
dc.date.accessioned.fl_str_mv |
2020-05-27T14:18:21Z |
dc.date.available.fl_str_mv |
2020-05-27T14:18:21Z |
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.citation.fl_str_mv |
SÃO JOSÉ, F. de; RODRIGUES, O. M. S.; PEREIRA, C. A. Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. Tecnologia em Metalurgia, Materiais e Mineração, São Paulo, v. 16, n. 1, p. 129-134, jan./mar. 2019. Disponível em: <https://www.tecnologiammm.com.br/doi/10.4322/2176-1523.20191551>. Acesso em: 10 mar. 2020. |
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http://www.repositorio.ufop.br/handle/123456789/12266 |
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2176-1523 |
dc.identifier.doi.pt_BR.fl_str_mv |
http://dx.doi.org/10.4322/2176-1523.20191551 |
identifier_str_mv |
SÃO JOSÉ, F. de; RODRIGUES, O. M. S.; PEREIRA, C. A. Electrochemical aspects in the flotation of leadzinc sulfides in Brazilian silicate ore – use of Na2S as modulator. Tecnologia em Metalurgia, Materiais e Mineração, São Paulo, v. 16, n. 1, p. 129-134, jan./mar. 2019. Disponível em: <https://www.tecnologiammm.com.br/doi/10.4322/2176-1523.20191551>. Acesso em: 10 mar. 2020. 2176-1523 |
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http://www.repositorio.ufop.br/handle/123456789/12266 http://dx.doi.org/10.4322/2176-1523.20191551 |
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