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Open AccessArticle

Leaching of Oxide Copper Ores by Addition of Weak Acid from Copper Smelters

1
Departamento de Ingeniería en Metalurgia, Universidad de Atacama, Av. Copayapu 485, Copiapó 1531772, Chile
2
Faculty of Engineering and Architecture, Universidad Arturo Prat, Almirante Juan José Latorre 2901, Antofagasta 1244260, Chile
3
Departamento de Ingeniería en Metalurgia y Minas, Universidad Católica del Norte, Av. Angamos 0610, Antofagasta 1270709, Chile
4
Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Antofagasta 1270300, Chile
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(5), 627; https://doi.org/10.3390/met10050627
Received: 20 April 2020 / Revised: 7 May 2020 / Accepted: 8 May 2020 / Published: 11 May 2020
(This article belongs to the Special Issue Separation and Leaching for Metals Recovery)
In this study, weak acid in the curing and leaching stages of copper ore was incorporated, and we analyzed its effect on the dissolution of copper and final impurities. The weak acid corresponds to a wastewater effluent from sulfuric acid plants produced in the gas treatment of copper smelting processes. This effluent is basically water with high acidity (pH-value low at 1), which contains several toxic elements and some valuable metals. The results indicated that there is no positive or negative effect on the incorporation of the weak acid in the curing stage, while the case of the leaching stage is favored. Toxicity characteristic leaching procedure (TCLP) and synthetic precipitation leaching procedure (SPLP) toxicity tests were performed on the solid leaching residues, determining that they accomplish the stability ranges of the impurities (Pb, Cd, Hg, Cr, Ba, Se, As, and Ag). View Full-Text
Keywords: weak acid; water consumption; sulfuric acid plant; arsenic weak acid; water consumption; sulfuric acid plant; arsenic
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MDPI and ACS Style

Araya, G.; Toro, N.; Castillo, J.; Guzmán, D.; Guzmán, A.; Hernández, P.; Jeldres, R.I.; Sepúlveda, R. Leaching of Oxide Copper Ores by Addition of Weak Acid from Copper Smelters. Metals 2020, 10, 627.

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