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Open AccessArticle

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

Faculty of Engineering and Architecture, Universidad Arturo Prat, Almirante Juan José Latorre 2901, Antofagasta 1244260, Chile
Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Antofagasta 1270300, Chile
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
Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Valparaíso 2340000, Chile
Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Antofagasta 1270709, Chile
Department of Mining, Geological and Cartographic Department, Universidad Politécnica de Cartagena, 30203 Murcia, Spain
Author to whom correspondence should be addressed.
Metals 2020, 10(3), 384;
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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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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