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Open AccessArticle

Leaching of Pure Chalcocite in a Chloride Media Using Waste Water at High Temperature

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Faculty of Engineering and Architecture, Universidad Arturo Prat, Almirante Juan José Latorre 2901, Antofagasta 1244260, Chile
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Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Antofagasta 1270300, Chile
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Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca—Tulancingo km. 4.5, Mineral de la Reforma, Hidalgo C.P. 42184, Mexico
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Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Valparaíso 2340000, Chile
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Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Antofagasta 1270709, Chile
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Department of Mining, Geological and Cartographic Department, Universidad Politécnica de Cartagena, 30203 Murcia, Spain
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Author to whom correspondence should be addressed.
Metals 2020, 10(3), 384; https://doi.org/10.3390/met10030384
Received: 10 February 2020 / Revised: 4 March 2020 / Accepted: 12 March 2020 / Published: 17 March 2020
Studying the dissolution of chalcocite allows to understand the behavior of the most abundant secondary sulfide ore in copper deposits, while digenite (Cu1.8S) and other intermediate sulfides (Cu2−xS) are often associated with chalcocite. The most common mechanism of dissolution is by two stages, and chloride ions benefit the kinetics of dissolution. In this study, a pure chalcocite mineral (99.9% according to XRD (X-Ray Diffraction) analysis) is leached in chloride media using NaCl and wastewater as the sources of chloride. Magnetic leaching tests are performed at 65, 75, and 95 °C, using a particle size between −150 and + 106 μm. Chloride concentration and leaching time are the main variables. A substantial dissolution of chalcocite was obtained with 0.5 M H2SO4, 100 g/L of chloride and a leaching time of 3 h. The apparent activation energy (Ea) derived from the slopes of the Arrhenius plots was 36 kJ/mol. The XRD analysis proves the presence of elemental sulfur (S0) as the main component in the leaching residue. No significant differences in copper extraction were detected when using 100 g/L of chloride ion or wastewater (39 g/L). View Full-Text
Keywords: sulfide leaching; desalination water; reusing water; waste water sulfide leaching; desalination water; reusing water; waste water
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MDPI and ACS Style

Pérez, K.; I. Jeldres, R.; Nieto, S.; Salinas-Rodríguez, E.; Robles, P.; Quezada, V.; Hernández-Ávila, J.; Toro, N. Leaching of Pure Chalcocite in a Chloride Media Using Waste Water at High Temperature. Metals 2020, 10, 384.

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