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Open AccessArticle

Reducing-Effect of Chloride for the Dissolution of Black Copper

1
Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Antofagasta 1270709, Chile
2
Department of Mining, Geological and Cartographic Department, Universidad Politécnica de Cartagena, Murcia 30203, Spain
3
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, C.P. 42184, Mineral de la Reforma, Hidalgo, Mexico
6
Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Valparaíso 2340000, Chile
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(1), 123; https://doi.org/10.3390/met10010123
Received: 13 December 2019 / Revised: 8 January 2020 / Accepted: 10 January 2020 / Published: 15 January 2020
Oxidized black copper ores are known for their difficulty in dissolving their components of interest through conventional methods. This is due to its non-crystalline and amorphous structure. Among these minerals, copper pitch and copper wad are of great interest because of their considerable concentrations of copper and manganese. Currently, these minerals are not incorporated into the extraction circuits or left untreated, whether in stock, leach pads, or waste. For the recovery of its main elements of interest (Cu and Mn), it is necessary to use reducing agents that dissolve the present MnO2, while allowing the recovery of Cu. In this research, the results for the dissolution of Mn and Cu from a black copper mineral are exposed, evaluating the reducing effect of NaCl for MnO2 through pre-treatment of agglomerate and curing, and subsequently leaching in standard condition with the use of a reducing agent (Fe2+). High concentrations of chloride in the agglomerate process and prolonged curing times would favor the reduction of MnO2, increasing the dissolution of Mn, while the addition of NaCl did not benefit Cu extractions. Under standard conditions, low Mn extractions were obtained, while in an acid-reducing medium, a significant dissolution of MnO2 was achieved, which supports the removal of Cu. View Full-Text
Keywords: agglomerate; copper pitch; copper wad; curing; pre-treatment agglomerate; copper pitch; copper wad; curing; pre-treatment
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MDPI and ACS Style

Torres, D.; Pérez, K.; Trigueros, E.; I. Jeldres, R.; Salinas-Rodríguez, E.; Robles, P.; Toro, N. Reducing-Effect of Chloride for the Dissolution of Black Copper. Metals 2020, 10, 123.

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