Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtenção
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
dARK ID: | ark:/26339/0013000004hnw |
Texto Completo: | http://repositorio.ufsm.br/handle/1/8002 |
Resumo: | Because of the constant introduction of new technologies to market growth of electronic waste generation has gained importance on the world stage, among these residues are cell phones. Deliver useful life increasingly short. Mobile phones are made up of several components, including LCD screens. In these screens there is a mixture of indium oxide (In) and tin (Sn), known as ITO, which 80-90% consists of In and 10-20% by Sn. There are already several studies that show ideal conditions for comminution and leaching of LCD screens, therefore, this study aims to establish an effective method for concentrating In present in aqueous solution coming from the acid leaching processes and thus regain In the form metal. Tests were conducted electrodialysis (ED), using synthetic solution In2(SO4)3 in order to work with a more environmentally acceptable method. Thus, initially tested for different current densities in a time of 120 minutes, monitoring pH and conductivity and varying the concentration of In every 30 minutes. The In concentration was determined by atomic absorption (AAS). The optimal current density was 0.96 mA/cm2, where was obtained 62.77% current efficiency. After setting the optimal current density applied in the same test of 131 hours, which resulted in a concentration of 521 mg/L In. Despite the use of electrodialysis have been able to concentrate the solution, the value of 521 mg/L is still not enough to recover In for electrowinning. Thus, we apply the solvent extraction method. Was used as DEHPA extractant diluted in commercial kerosene and evaluated the best contact time between the aqueous phase (A) and organic (O), pH, ratio A:O, better DEHPA concentration in the organic phase. For stripping evaluated the best molar concentration of HCl, relative A:O and contact time between phases. The best conditions laid down have been applied in real solution In, obtained leaching LCD screens, with concentration 32.44 mg/L. The best conditions are obtained in the extraction ratio A:O of 40:1, in 20 minutes, at pH 0,5 e obtained a 96,67% efficiency applied after the stripping in the loaded organic solution with In, with respect to 1:10 with concentration of HCl 4M in 10 minutes, resulting in a efficiency of 61,10% and concentration of 7,712 g/L In. Also performed were tests electrowinning (EO) evaluated three different current densities, and 150 A/m² was obtained a 50.71% efficiency at a concentration of 7 g/L. Therefore, two further phases in In recovery process were developed in recovering In its metallic form giving opportunity for new applications, reducing the consumption of natural resources. |
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Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtençãoTechnical comparison for concentration indium of LCD screens and electrowinning applicationÍndioTelas de LCDEletrodiáliseExtração por solventesEletro-obtençãoIndiumLCD screensElectrodialysisSolvent extractionElectrowinningCNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAOBecause of the constant introduction of new technologies to market growth of electronic waste generation has gained importance on the world stage, among these residues are cell phones. Deliver useful life increasingly short. Mobile phones are made up of several components, including LCD screens. In these screens there is a mixture of indium oxide (In) and tin (Sn), known as ITO, which 80-90% consists of In and 10-20% by Sn. There are already several studies that show ideal conditions for comminution and leaching of LCD screens, therefore, this study aims to establish an effective method for concentrating In present in aqueous solution coming from the acid leaching processes and thus regain In the form metal. Tests were conducted electrodialysis (ED), using synthetic solution In2(SO4)3 in order to work with a more environmentally acceptable method. Thus, initially tested for different current densities in a time of 120 minutes, monitoring pH and conductivity and varying the concentration of In every 30 minutes. The In concentration was determined by atomic absorption (AAS). The optimal current density was 0.96 mA/cm2, where was obtained 62.77% current efficiency. After setting the optimal current density applied in the same test of 131 hours, which resulted in a concentration of 521 mg/L In. Despite the use of electrodialysis have been able to concentrate the solution, the value of 521 mg/L is still not enough to recover In for electrowinning. Thus, we apply the solvent extraction method. Was used as DEHPA extractant diluted in commercial kerosene and evaluated the best contact time between the aqueous phase (A) and organic (O), pH, ratio A:O, better DEHPA concentration in the organic phase. For stripping evaluated the best molar concentration of HCl, relative A:O and contact time between phases. The best conditions laid down have been applied in real solution In, obtained leaching LCD screens, with concentration 32.44 mg/L. The best conditions are obtained in the extraction ratio A:O of 40:1, in 20 minutes, at pH 0,5 e obtained a 96,67% efficiency applied after the stripping in the loaded organic solution with In, with respect to 1:10 with concentration of HCl 4M in 10 minutes, resulting in a efficiency of 61,10% and concentration of 7,712 g/L In. Also performed were tests electrowinning (EO) evaluated three different current densities, and 150 A/m² was obtained a 50.71% efficiency at a concentration of 7 g/L. Therefore, two further phases in In recovery process were developed in recovering In its metallic form giving opportunity for new applications, reducing the consumption of natural resources.Fundação de Amparo a Pesquisa no Estado do Rio Grande do SulDevido a constante introdução de novas tecnologias no mercado, o crescimento da geração de resíduos eletroeletrônicos tem ganhado importância no cenário mundial, dentre esses resíduos estão os telefones celulares. Estes equipamentos apresentam um tempo de vida útil cada vez mais curto. Os celulares são constituídos por diversos componentes, dentre eles as telas de LCD. Nessas telas há uma mistura de óxido de índio (In) e estanho (Sn), conhecida como ITO, onde de 80-90% é composta por In e 10-20% por Sn. Já existem diversos estudos que mostram condições ideais para cominuição e lixiviação das telas de LCD, assim sendo, este trabalho tem por objetivo estabelecer um método eficaz para concentrar o In presente em solução aquosa oriunda dos processos de lixiviação ácida e assim recuperar o In na forma metálica. Foram realizados testes de eletrodiálise (ED), utilizando solução sintética de In2(SO4)3, a fim de trabalhar com um método mais ambientalmente aceitável. Desta forma, inicialmente testou-se diferentes densidades de corrente em um tempo de 120 minutos, monitorando pH e condutividade e variação da concentração do In a cada 30 minutos. A concentração de In foi determinada por absorção atômica (AAS). A densidade de corrente mais adequada dentro das condições experimentais foi de 0,96 mA/cm2, onde se obteve 62,77% de eficiência de corrente. Após a definição da densidade de corrente ideal aplicou-se a mesma num ensaio de 131 horas, onde resultou em uma concentração 521 mg/L de In. Apesar do emprego da eletrodiálise ter conseguido concentrar a solução, o valor de 521 mg/L ainda não é suficiente para recuperar o In por eletro-obtenção. Desta forma, aplicou-se o método de extração por solventes. Utilizou-se como extrator DEHPA diluído em querosene comercial e avaliou-se o melhor tempo de contato entre as fases aquosa (A) e orgânica (O), pH, relação A:O, melhor concentração de DEHPA na fase orgânica. Para a re-extração avaliou-se a melhor concentração molar de HCl, relação A:O e tempo de contato entre as fases. As melhores condições estabelecidas foram aplicadas em solução real de In, obtida de lixiviação de telas de LCD, com concentração 32,44 mg/L. As melhores condições obtidas foram na extração a relação A:O de 40:1, em 20 minutos, com pH 0,5 e obteve-se uma eficiência de 96,67%, após aplicou-se a re-extração na solução orgânica carregada com o In, com relação de 1:10, HCl com concentração 4 M em 10 minutos, resultando em uma eficiência de 61,10% e uma concentração de 7,712 g/L de In. Também foram realizados testes de eletro-obtenção (EO), avaliando três diferentes densidades de corrente, sendo que com 150 A/m² obteve-se uma eficiência de 50,71%, com concentração de 7 g/L. Sendo assim, duas novas etapas no processo de recuperação de In foram desenvolvidas, recuperando In em sua forma metálica dando oportunidade para novas aplicações, reduzindo o consumo de recursos naturais.Universidade Federal de Santa MariaBREngenharia de ProcessosUFSMPrograma de Pós-Graduação em Engenharia de ProcessosBertuol, Daniel Assumpçãohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4773021H6Dotto, Guilherme Luizhttp://lattes.cnpq.br/5412544199323879Meili, Lucashttp://lattes.cnpq.br/3802018064427795Pereira, Estela Bresolin2016-06-072016-06-072015-12-18info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfapplication/pdfPEREIRA, Estela Bresolin. TECHNICAL COMPARISON FOR CONCENTRATION INDIUM OF LCD SCREENS AND ELECTROWINNING APPLICATION. 2015. 120 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Santa Maria, Santa Maria, 2015.http://repositorio.ufsm.br/handle/1/8002ark:/26339/0013000004hnwporinfo:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2021-02-17T11:21:04Zoai:repositorio.ufsm.br:1/8002Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2021-02-17T11:21:04Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtenção Technical comparison for concentration indium of LCD screens and electrowinning application |
title |
Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtenção |
spellingShingle |
Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtenção Pereira, Estela Bresolin Índio Telas de LCD Eletrodiálise Extração por solventes Eletro-obtenção Indium LCD screens Electrodialysis Solvent extraction Electrowinning CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO |
title_short |
Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtenção |
title_full |
Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtenção |
title_fullStr |
Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtenção |
title_full_unstemmed |
Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtenção |
title_sort |
Comparação de técnicas para concentração de índio de telas de LCD e aplicação de eletro-obtenção |
author |
Pereira, Estela Bresolin |
author_facet |
Pereira, Estela Bresolin |
author_role |
author |
dc.contributor.none.fl_str_mv |
Bertuol, Daniel Assumpção http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4773021H6 Dotto, Guilherme Luiz http://lattes.cnpq.br/5412544199323879 Meili, Lucas http://lattes.cnpq.br/3802018064427795 |
dc.contributor.author.fl_str_mv |
Pereira, Estela Bresolin |
dc.subject.por.fl_str_mv |
Índio Telas de LCD Eletrodiálise Extração por solventes Eletro-obtenção Indium LCD screens Electrodialysis Solvent extraction Electrowinning CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO |
topic |
Índio Telas de LCD Eletrodiálise Extração por solventes Eletro-obtenção Indium LCD screens Electrodialysis Solvent extraction Electrowinning CNPQ::ENGENHARIAS::ENGENHARIA DE PRODUCAO |
description |
Because of the constant introduction of new technologies to market growth of electronic waste generation has gained importance on the world stage, among these residues are cell phones. Deliver useful life increasingly short. Mobile phones are made up of several components, including LCD screens. In these screens there is a mixture of indium oxide (In) and tin (Sn), known as ITO, which 80-90% consists of In and 10-20% by Sn. There are already several studies that show ideal conditions for comminution and leaching of LCD screens, therefore, this study aims to establish an effective method for concentrating In present in aqueous solution coming from the acid leaching processes and thus regain In the form metal. Tests were conducted electrodialysis (ED), using synthetic solution In2(SO4)3 in order to work with a more environmentally acceptable method. Thus, initially tested for different current densities in a time of 120 minutes, monitoring pH and conductivity and varying the concentration of In every 30 minutes. The In concentration was determined by atomic absorption (AAS). The optimal current density was 0.96 mA/cm2, where was obtained 62.77% current efficiency. After setting the optimal current density applied in the same test of 131 hours, which resulted in a concentration of 521 mg/L In. Despite the use of electrodialysis have been able to concentrate the solution, the value of 521 mg/L is still not enough to recover In for electrowinning. Thus, we apply the solvent extraction method. Was used as DEHPA extractant diluted in commercial kerosene and evaluated the best contact time between the aqueous phase (A) and organic (O), pH, ratio A:O, better DEHPA concentration in the organic phase. For stripping evaluated the best molar concentration of HCl, relative A:O and contact time between phases. The best conditions laid down have been applied in real solution In, obtained leaching LCD screens, with concentration 32.44 mg/L. The best conditions are obtained in the extraction ratio A:O of 40:1, in 20 minutes, at pH 0,5 e obtained a 96,67% efficiency applied after the stripping in the loaded organic solution with In, with respect to 1:10 with concentration of HCl 4M in 10 minutes, resulting in a efficiency of 61,10% and concentration of 7,712 g/L In. Also performed were tests electrowinning (EO) evaluated three different current densities, and 150 A/m² was obtained a 50.71% efficiency at a concentration of 7 g/L. Therefore, two further phases in In recovery process were developed in recovering In its metallic form giving opportunity for new applications, reducing the consumption of natural resources. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-12-18 2016-06-07 2016-06-07 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
PEREIRA, Estela Bresolin. TECHNICAL COMPARISON FOR CONCENTRATION INDIUM OF LCD SCREENS AND ELECTROWINNING APPLICATION. 2015. 120 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Santa Maria, Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/8002 |
dc.identifier.dark.fl_str_mv |
ark:/26339/0013000004hnw |
identifier_str_mv |
PEREIRA, Estela Bresolin. TECHNICAL COMPARISON FOR CONCENTRATION INDIUM OF LCD SCREENS AND ELECTROWINNING APPLICATION. 2015. 120 f. Dissertação (Mestrado em Engenharia) - Universidade Federal de Santa Maria, Santa Maria, 2015. ark:/26339/0013000004hnw |
url |
http://repositorio.ufsm.br/handle/1/8002 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Engenharia de Processos UFSM Programa de Pós-Graduação em Engenharia de Processos |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Engenharia de Processos UFSM Programa de Pós-Graduação em Engenharia de Processos |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
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1815172281937166336 |