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Néstor Ricardo Rojas-Reyes
The pyrometallurgical copper extraction process generates 2.2 t of residues for each ton of produced metal. Initially, this paper shows the physical and chemical characterization of a copper processing residue, followed by the procedure to obtain the gold and silver that are contained in the copper residue. The characterization of a white metal oxidized calcine indicates a high content of copper as cupric ferrite, and important values of gold and silver. Gold and silver concentrations were 38.5 g t-1 and 1085 g t-1, respectively. The gold was found scattered in cupric ferrite grains, while the silver was dissolved in a matrix of Cu-S in amounts between 1 % and 50 %. Cyanidation tests showed that 95 % gold recovery could be obtained with a concentration of 0.06 g l-1 KCN, a pH of 10.5, room temperature, and a residence time of 80 h. When the temperature was increased to 75 °C, and the other cyanidation parameters were maintained intact, the same recovery was obtained but with a shorter residence time. Silver recovery was less than 30 % with a concentration of 1.2 g l-1 KCN, pH of 10.5, temperature of 45 °C, and a residence time longer than 72 h.
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 S. Roy, A. Datta, and S. Rehani, “Flotation of copper sulphide from copper smelter slag using multiple collectors and their mixtures,” Int. J. Miner. Process., vol. 143, pp. 43-49, Oct. 2015. DOI: http://doi.org/10.1016/j.minpro.2015.08.008.
 P. Cendoya, “Efecto en la resistencia de las escorias de fundición de cobre como agregado fino en el comportamiento resistente del hormigón,” Ingeniare. Rev. Chil. Ing., vol. 17 (1), pp. 85-94, Apr. 2009. DOI: http://doi.org/10.4067/S0718-33052009000100009.
 E. A. Johnson, L. L. Oden, P. E. Sanker, and R. L. Fulton, “Minor-Element Interactions in Copper Matte Smelting,” p. 9, 1984.
 O. Herreros, R. Quiroz, E. Manzano, C. Bou, and J. Viñals, “Copper extraction from reverberatory and flash furnace slags by chlorine leaching,” Hydrometallurgy, vol. 49 (1-2), pp. 87–101, Jun. 1998. DOI: http://doi.org/10.1016/S0304-386X(98)00010-3.
 A. N. Banza, E. Gock, and K. Kongolo, “Base metals recovery from copper smelter slag by oxidising leaching and solvent extraction,” Hydrometallurgy, vol. 67 (1-3), pp. 63-69, Dec. 2002. DOI: http://doi.org/10.1016/S0304-386X(02)00138-X.
 C. Arslan and F. Arslan, “Recovery of copper, cobalt, and zinc from copper smelter and converter slags,” Hydrometallurgy, vol. 67 (1-3), pp. 1-7, Dec. 2002. DOI: http://doi.org/10.1016/S0304-386X(02)00139-1.
 C. Gasparrini, The Metallurgy of the Precious Metals as Affected by their Mineralogy and Manner of Occurrence in their Ores. 1984.
 N. Hedley and H. Tabachnick, Chemistry of cyanidation. American Cyanamid Company, Explosives and Mining Chemicals Department, 1958.
 C. A. Fleming, “Hydrometallurgy of precious metals recovery,” Hydrometallurgy, vol. 30 (1-3), pp. 127-162, Jun. 1992. DOI: http://doi.org/10.1016/0304-386X(92)90081-A.
 J. Vargas Gallardo, Metalurgia del oro y la plata. Editorial San Marcos, Lima, 1981.
 V. Kudryk and H. H. Kellogg, “Mechanism and rate-controlling factors in the dissolution of gold in cyanide solution,” J. Met., vol. 6 (5), pp. 541-548, 1954.
 D. Menne, “Assaying Cyanide Extractable Gold within an Hour, and Addressing Effects of Pregand Assay-Robbing,” Extr. Metall. Gold Base Met. Kalgoorlie WA, AusIMM, 1992.
 M. I. Jeffrey, “A Kinetic and electrochemical study of the dissolution of gold in aerated cyanide solutions: the role of solid and solution phase purity,” 1997.
 M. Benavente and J. Martínez, “Especiación acuosa de cianuro y componentes derivados en lavados de colas de minerales de oro,” Nexo, vol. 19 (1), pp. 1-9, 2006.
 N. Rojas Reyes, Recuperación de oro y plata desde residuos ferríticos mediante cianuración, Universidad de Concepción, 2003.