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Cupric and Chloride Ions: Leaching of Chalcopyrite Concentrate with Low Chloride Concentration Media
Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Antofagasta, Chile. Centro Integrado de Pilotaje de Tecnologías Mineras, CIPTEMIN, Antofagasta 124000, Chile..
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0002-5228-3888
Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta,Antofagasta, Chile.
Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Antofagasta, Chile. Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta,Antofagasta, Chile..
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2019 (English)In: Minerals, ISSN 2075-163X, E-ISSN 2075-163X, Vol. 9, no 10, article id 639Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 9, no 10, article id 639
Keywords [en]
copper sulfide, chloro-complex, cupric ion, chalcopyrite, chloride
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-76440DOI: 10.3390/min9100639Scopus ID: 2-s2.0-85074233412OAI: oai:DiVA.org:ltu-76440DiVA, id: diva2:1362325
Note

Validerad;2019;Nivå 2;2019-10-18 (svasva)

Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-11-20Bibliographically approved

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