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Open AccessArticle

Cupric and Chloride Ions: Leaching of Chalcopyrite Concentrate with Low Chloride Concentration Media

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Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta 1270709, Chile
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Centro Integrado de Pilotaje de Tecnologías Mineras, CIPTEMIN, Avenida Bernardo O’Higgins 0338, Antofagasta 124000, Chile
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Department of Civil, Environmental & Natural Resources Engineering, Luleå University of Technology, SE-971 87, 97100 Luleå, Sweden
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Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Avenida Angamos 601, Antofagasta 1270300, Chile
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Departamento de Ingeniería en Minas, Universidad de Antofagasta, Avenida Angamos 601, Antofagasta 1270300, Chile
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(10), 639; https://doi.org/10.3390/min9100639
Received: 12 July 2019 / Revised: 11 October 2019 / Accepted: 15 October 2019 / Published: 18 October 2019
(This article belongs to the Special Issue Hydrometallurgical Processing of Base Metal Sulphides)
In this paper, the effect of the cupric and chloride ions concentrations on copper dissolution from chalcopyrite concentrate was studied in acidified media. Variables included three different concentrations of Cu2+ (0.5, 1.5, and 2.5 g L−1), four different concentrations of Cl (0, 5, 7, and 10 g L−1), two different pH values of 1 and 2, and a constant temperature of 60 °C. Results indicated that addition of Cl to the system improves copper extractions, especially at higher concentrations of Cu2+. Initial copper concentrations in the leaching solution did not significantly affect the copper extraction when Cl was not present. Better copper extractions were obtained at pH 1 as compared with pH 2. As the Cu2+ and Cl concentrations were increased, higher values of redox potential were obtained. According to the formation constants of the chloro-complexes, the predominant species in the Cu2+/Cl system in the studied interval were CuCl+ and Cu2+. Using a model of copper speciation in the experimental range predicted for a single copper concentration with increasing Cl concentration, the Cu2+ concentration decreased significantly while the concentration of the chloro-complex species CuCl+ increased. In the leached residue, evidence of sulfur formation was found using SEM and corroborated by XRD analysis. When chloride is present in the medium, the amounts of copper and iron in the residue decrease, confirming a positive effect of chloride on the extraction of copper from concentrate for the studied conditions. View Full-Text
Keywords: copper sulfide; chloro-complex; cupric ion; chalcopyrite; chloride copper sulfide; chloro-complex; cupric ion; chalcopyrite; chloride
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MDPI and ACS Style

Torres, C.M.; Ghorbani, Y.; Hernández, P.C.; Justel, F.J.; Aravena, M.I.; Herreros, O.O. Cupric and Chloride Ions: Leaching of Chalcopyrite Concentrate with Low Chloride Concentration Media. Minerals 2019, 9, 639.

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