Journal
INTERNATIONAL JOURNAL OF MINERAL PROCESSING
Volume 149, Issue -, Pages 25-33Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.minpro.2016.02.001
Keywords
Chalcopyrite leaching; Electrochemical impedance spectroscopy; Acid dissolution; Raman spectroscopy
Funding
- National Council for Scientific and Technological Development [305661/2011-6]
- Research Support Foundation of Minas Gerais State
- Coordination of Improvement of Higher Education Personnel
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Electrochemical and surface analyses were carried out to study the leaching of chalcopyrite in acid media, 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 Unpublished results include the use of electrochemical impedance spectroscopy (EIS) to characterize the dissolution resistance of chalcopyrite surfaces in 0.1 mol.L-1 of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 electron microscopy with 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. (C) 2016 Elsevier B.V. All rights reserved.
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