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http://hdl.handle.net/1843/58462| Tipo: | Artigo de Periódico |
| Título: | Electrochemical study of chalcopyrite dissolution in sulfuric, nitric and hydrochloric acid solutions |
| Autor(es): | Tatiana das Chagas Almeida Eric Marsalha Garcia Hugo Walisson Alves da Silva Tulio Matencio Vanessa de Freitas Cunha Lins |
| Resumo: | Electrochemical 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 Unpublished results include the use of electrochemical impedance spectroscopy (EIS) to characterize the dissolution resistance of chalcopyrite surfaces in 0.1 mol·L−¹ of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. |
| Assunto: | Eletroquímica Lixiviação Calcopirita Espectroscopia de impedância Raman, Espectroscopia de. Ácido sulfúrico Ácido nítrico Ácido clorídrico |
| Idioma: | eng |
| País: | Brasil |
| Editor: | Universidade Federal de Minas Gerais |
| Sigla da Instituição: | UFMG |
| Departamento: | ENG - DEPARTAMENTO DE ENGENHARIA QUÍMICA ICX - DEPARTAMENTO DE QUÍMICA |
| Tipo de Acesso: | Acesso Restrito |
| Identificador DOI: | https://doi.org/10.1016/j.minpro.2016.02.001 |
| URI: | http://hdl.handle.net/1843/58462 |
| Data do documento: | 2016 |
| metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S0301751616300254 |
| metadata.dc.relation.ispartof: | International Journal of Mineral Processing |
| Aparece nas coleções: | Artigo de Periódico |
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