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Minerals 2018, 8(7), 309;

Determination of Dissolution Rates of Ag Contained in Metallurgical and Mining Residues in the S2O32−-O2-Cu2+ System: Kinetic Analysis

Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo (UAEH), Pachuca de Soto, Hidalgo 42184, Mexico
Ingeniería en Energía, Universidad Politécnica Metropolitana de Hidalgo, Tolcayuca, Hidalgo 43860, Mexico
Facultat de Química, Departament de Ciència dels Materials I Enginyeria Metallúrgica, Universitat de Barcelona, Provincia de Barcelona, 08028 Barcelona, Spain
Catedrático CONACYT-Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, San Luis Potosí, San Luis Potosí 78210, Mexico
Área de Electromecánica Industrial, Universidad Tecnológica de Tulancingo, Tulancingo, Hidalgo 43642, México
Author to whom correspondence should be addressed.
Received: 28 June 2018 / Revised: 15 July 2018 / Accepted: 18 July 2018 / Published: 23 July 2018
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The materials used to conduct kinetic study on the leaching of silver in the S2O32−-O2-Cu2+ system were mining residues (tailings) from the Dos Carlos site in the State of Hidalgo, Mexico, which have an estimated concentration of Ag = 71 g∙ton−1. The kinetic study presented in this paper assessed the effects of the following variables on Ag dissolution rate: particle diameter (d0), temperature (T), copper concentration [Cu2+], thiosulfate concentration [S2O32−], pH, [OH], stirring rate (RPM), and partial pressure of oxygen (PO2). Temperature has a favorable effect on the leaching rate of Ag, obtaining an activation energy (Ea) = 43.5 kJ∙mol−1 in a range between 288 K (15 °C) and 328 K (55 °C), which indicates that the dissolution reaction is controlled by the chemical reaction. With a reaction order of n = 0.4, the addition of [Cu2+] had a catalytic effect on the leaching rate of silver, as opposed to not adding it. The dissolution rate is dependent on [S2O32−] in a range between 0.02 mol·L−1 and 0.06 mol·L−1. Under the studied conditions, variables d0, [OH] and RPM did not have an effect on the overall rate of silver leaching. View Full-Text
Keywords: silver leaching; thiosulfate; mining residues; kinetic analysis silver leaching; thiosulfate; mining residues; kinetic analysis

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Juárez Tapia, J.C.; Patiño Cardona, F.; Roca Vallmajor, A.; Teja Ruiz, A.M.; Reyes Domínguez, I.A.; Reyes Pérez, M.; Pérez Labra, M.; Flores Guerrero, M.U. Determination of Dissolution Rates of Ag Contained in Metallurgical and Mining Residues in the S2O32−-O2-Cu2+ System: Kinetic Analysis. Minerals 2018, 8, 309.

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