Extração de cobre de resíduos eletroeletrônicos utilizando os extratantes orgânicos Lix 84-IC e Cyanex 272
DOI:
https://doi.org/10.53660/CONJ-2133-2X03Palavras-chave:
Resíduo eletrônico; Placa de circuito impresso; Metal; Reciclagem.Resumo
Objetivou-se analisar a viabilidade de extração química de cobre presente em placas-mãe de computadores. O material foi cominuído e caracterizado quimicamente por Microscopia Eletrônica de Varredura com Espectroscopia de Energia Dispersiva e Espectrometria de Fluorescência de Raios-X. Foram realizadas lixiviações utilizando-se os ácidos HCl–HNO 3 3:1, nas concentrações 2N, 4N e 6N, a 80ºC durante 4h. Os lixiviados foram analisados quimicamente por Espectrometria de Emissão Óptica com Plasma Induzido. A utilização da solução HCl–HNO 3 a 2 N demorou 180 min para extrair 96,5% de cobre. Para as soluções de HCl–HNO 3 a 4N e 6 N foram extraídos aproximadamente 96% de cobre nos primeiros 30 min de lixiviação. Os lixiviados foram submetidos a extrações por contato direto utilizando-se os solventes Lix 84-IC e Cyanex 272 diluídos em querosene. Foram recuperados 97,10 % de cobre em pH 4 utilizando Lix 84-IC e 83,82% utilizando-se Cyanex 272.
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ABINEE – Associação Brasileira da Indústria Elétrica e Eletrônica. Panorama Econômico e Desempenho Setorial 2022. Disponível em: <http://www.abinee.org.br/abinee/decon/panorama/2022/>. Acesso em: 17 nov. 2022.
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