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

Pérez, Kevin; I. Jeldres, Ricardo; Nieto, Steven; Salinas-Rodríguez, Eleazar; Robles, Pedro; Quezada, Víctor; Hernández-Ávila, Juan; Toro, Norman


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 degrees C, using a particle size between -150 and + 106 mu m. 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 (S-0) 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).

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Título según WOS: Leaching of Pure Chalcocite in a Chloride Media Using Waste Water at High Temperature
Título según SCOPUS: Leaching of pure chalcocite in a chloride media using waste water at high temperature
Título de la Revista: METALS
Volumen: 10
Número: 3
Editorial: MDPI
Fecha de publicación: 2020
Idioma: English