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Open AccessArticle

Effect of Pretreatment on Leaching Primary Copper Sulfide in Acid-Chloride Media

1
Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Avda, Angamos 601, Antofagasta 1270300, Chile
2
Centro de Investigación Científico Tecnológico para la Minería (CICITEM), Sucre 220, Of. 604, Antofagasta 1270300, Chile
3
School of Natural and Built Environment, Faculty of Science, Engineering and Computing, Kingston University, London KT1 2EE, UK
*
Author to whom correspondence should be addressed.
Minerals 2018, 8(1), 1; https://doi.org/10.3390/min8010001
Received: 25 October 2017 / Revised: 11 December 2017 / Accepted: 19 December 2017 / Published: 21 December 2017
(This article belongs to the Special Issue Heap Leaching: The State-of-the-Art)
The aim of this study was to improve the dissolution of copper sulfide ore composed mainly of chalcopyrite (1.21 wt %) and bornite (0.54 wt %) using a pretreatment before leaching. The effect of the pretreatment on copper sulfide dissolution was investigated using different types of leaching. Three sets of experimental tests were performed (flask, reactor and mini-column). Using experimental design, three operational variables in the ore pretreatment were evaluated: chloride concentration (20, 50 and 90 kg/t), repose time (7, 20 and 40 days) and repose temperature (20 and 50 °C). A maximum of 93% copper dissolution was obtained when the ore was treated with 90 kg Cl/t ore, 40 d of repose time and 50 °C in flask leaching. Without any ore pretreatment, 53% copper dissolution was achieved. Using reactor leaching, an 85% copper dissolution was obtained using pretreatment stage. Without this pretreatment, only 55% copper dissolution was obtained. The final test, which involved leaching a pretreated ore in a mini-column at room temperature, yielded 49% copper dissolution. The data showed that repose time and temperature were the most important variables affecting copper extraction in the pretreatment stage. This study indicates that pretreatment has a positive effect on copper dissolution from primary copper sulfide ore in an acid-chloride medium. It also provides a feasible alternative for treating primary copper sulfide ores at the industrial level. View Full-Text
Keywords: chalcopyrite; chloride; leaching; pretreatment; seawater chalcopyrite; chloride; leaching; pretreatment; seawater
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MDPI and ACS Style

Cerda, C.P.; Taboada, M.E.; Jamett, N.E.; Ghorbani, Y.; Hernández, P.C. Effect of Pretreatment on Leaching Primary Copper Sulfide in Acid-Chloride Media. Minerals 2018, 8, 1. https://doi.org/10.3390/min8010001

AMA Style

Cerda CP, Taboada ME, Jamett NE, Ghorbani Y, Hernández PC. Effect of Pretreatment on Leaching Primary Copper Sulfide in Acid-Chloride Media. Minerals. 2018; 8(1):1. https://doi.org/10.3390/min8010001

Chicago/Turabian Style

Cerda, Cecilia P.; Taboada, María E.; Jamett, Nathalie E.; Ghorbani, Yousef; Hernández, Pía C. 2018. "Effect of Pretreatment on Leaching Primary Copper Sulfide in Acid-Chloride Media" Minerals 8, no. 1: 1. https://doi.org/10.3390/min8010001

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