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Open AccessArticle

Optimization of Cu and Mn Dissolution from Black Coppers by Means of an Agglomerate and Curing Pretreatment

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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 Metalúrgica y Minas, Universidad Católica del Norte, Av. Angamos 0610, Antofagasta 1270709, Chile
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Departamento de Ingeniería Química y Procesos de Minerales, Facultad de Ingeniería, Universidad de Antofagasta, Antofagasta 1270300, Chile
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Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Valparaíso 2340000, Chile
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Department of Chemistry, University of the Free State, Nelson Mandela Drive, Bloemfontein 9300, South Africa
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Departamento de Ingeniería Minera y Civil, Universidad Politécnica de Cartagena, Paseo Alfonso XIII N°52, 30203 Cartagena, Spain
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(5), 657; https://doi.org/10.3390/met10050657
Received: 19 April 2020 / Revised: 9 May 2020 / Accepted: 14 May 2020 / Published: 19 May 2020
Black coppers are mineraloids with a high content of Cu and Mn. These have an amorphous crystalline structure that makes them refractory to conventional leaching processes. For this reason, these mineral resources are not incorporated in industrial leaching heap processes and are taken to dumps. In the present study, an agglomerate pretreatment process incorporating NaCl is evaluated, and a curing stage, followed by acid-reducing leaching for Cu and Mn dissolution from a high-grade black copper mineral. For this, an experimental design was developed both to evaluate the impact of the dependent variables on the response, to generate analytical models that represent the copper and manganese recoveries under the set of sampled conditions. The models indicate that the curing time and the NaCl concentration have a primary effect on the recovery of both elements. In contrast, the optimization model suggests that the optimal operating levels are reached at relatively high levels of time (>130 h) and of NaCl concentration (>22 kg/t). View Full-Text
Keywords: exotic minerals; black copper; chloride reduction; pretreatment; modeling exotic minerals; black copper; chloride reduction; pretreatment; modeling
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MDPI and ACS Style

Saldaña, M.; Gálvez, E.; Jeldres, R.I.; Díaz, C.; Robles, P.; Sinha, M.K.; Toro, N. Optimization of Cu and Mn Dissolution from Black Coppers by Means of an Agglomerate and Curing Pretreatment. Metals 2020, 10, 657.

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