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Open AccessArticle

Extraction of Mn from Black Copper Using Iron Oxides from Tailings and Fe2+ as Reducing Agents in Acid Medium

1
Departamento de Ingeniería en Metalurgia 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
Departamento de Ciencias Geológicas, Universidad Católica del Norte, Antofagasta 1270709, Chile
4
Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Antofagasta 1270300, Chile
5
Departamento de Construcción, Universidad de Atacama, Copiapó 1531772, Chile
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Laboratorio de Metalurgia Extractiva y Síntesis de Materiales (MESiMat-ICB-UNCUYO-CONICET-FCEN, Padre Contreras 1300, Parque Gral. San Martín), CP 5500 Mendoza, Argentina
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1112; https://doi.org/10.3390/met9101112
Received: 13 September 2019 / Revised: 11 October 2019 / Accepted: 16 October 2019 / Published: 18 October 2019
(This article belongs to the Special Issue Advances in Mineral Processing and Hydrometallurgy)
Exotic type deposits include several species of minerals, such as atacamite, chrysocolla, copper pitch, and copper wad. Among these, copper pitch and copper wad have considerable concentrations of manganese. However, their non-crystalline and amorphous structure makes it challenging to recover the elements of interest (like Cu or Mn) by conventional hydrometallurgical methods. For this reason, black copper ores are generally not incorporated into the extraction circuits or left unprocessed, whether in stock, leach pads, or waste. Therefore, to dilute MnO2, the use of reducing agents is essential. In the present research, agitated leaching was performed to dissolve Mn of black copper in an acidic medium, comparing the use of ferrous ions and tailings as reducing agents. Two samples of black copper were studied, of high and low grade of Mn, respectively, the latter with a high content of clays. The effect on the reducing agent/black copper ratio and the concentration of sulfuric acid in the system were evaluated. Better results in removing Mn were achieved using the highest-grade black copper sample when working with ferrous ions at a ratio of Fe2+/black copper of 2/1 and 1 mol/L of sulfuric acid. Besides, the low-grade sample induced a significant consumption of H2SO4 due to the high presence of gangue and clays. View Full-Text
Keywords: waste treatment; reducing agent; manganese waste treatment; reducing agent; manganese
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MDPI and ACS Style

Pérez, K.; Toro, N.; Campos, E.; González, J.; Jeldres, R.I.; Nazer, A.; Rodriguez, M.H. Extraction of Mn from Black Copper Using Iron Oxides from Tailings and Fe2+ as Reducing Agents in Acid Medium. Metals 2019, 9, 1112.

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