Abstract
The recovery of copper from oxide ores containing from 2% to 4.1% acid-soluble copper from the Sarcheshmeh mine in Kerman province of Iran was investigated by agitation leaching in sulfuric acid media. Quartz, as a major constituent, and malachite, as the major copper mineral, were identified in the ore by X-ray diffraction (XRD) and microscopic studies. A series of leaching experiments on the ore was performed over a concentration range of 10 to 20 g/L and temperatures from 15° to 50°C for a maximum of 3 hours. An initial high dissolution of copper was followed by a very slow reaction. By increasing acid concentration and temperature, the dissolution rate of copper was accelerated. However, by increasing acid concentration, the acid consumption of ores was also increased. Surface morphology of solid residues at various leaching times was examined with a scanning electron microscope (SEM). All SEM micrographs of the partially reacted particles displayed a needle structure. The kinetic studies showed that the malachite dissolution rate could be modeled in two stages. About 85% of the malachite dissolution occurred in Stage 1, while the remaining 15% occurred in Stage 2. The data obtained for the leaching kinetics indicate that the dissolution for Stage 1 was a diffusion-controlled reaction with an activation energy of about 20.6 kJ/mole, and the dissolution for the Stag 2 was a chemical-controlled reaction with an activation energy of about 87.6 kJ/mole.
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Ata, O.N., Colak, S., and Ekinci, Z., 2001, “Determination of the optimum condition for leaching of malachite ore in H2SO4 solution,” Chemical Engineering & Technology, Vol. 24, No. 4, pp. 409–413.
Bingoel, D., and Canbazoglu, M., 2004, “Dissolution kinetics of malachite in sulfuric acid,” Hydrometallurgy, Vol. 72. pp. 159–165.
Biswas, A.K., and Davenport, W.G., 1980, Extractive Metallurgy of Copper, 2nd Edition, Pergamon Press, 438 pp.
Cook, S.S., and Paulson, S.E., 1989, “Leaching characteristics of selected supergene copper ores,” Mining Engineering, pp. 33–39.
Cooper, F.D., 1968, “Copper hydrometallurgy, A review and outlook,” U.S. Bureau of Mines, Information Circular, IC 8394, 18 pp.
Haver, F.P., and Wong, W.W., 1971, “Recovery of copper, iron and sulfur from chalcopyrite concentrate using ferric chloride leach,” Journal of Metals, Vol. 23, No. 2, pp. 25–29.
Jackson, E., 1986, Hydrometallurgical Extraction and Reclamation, Ellis Hordwood Limited, 266 pp.
Koplov, G.A., and Orlov, A.I., 1964, Trans. Inst. Met. I Obogasch, Akad, Nauk, Kaz, SSR II, Vol. 82. pp. 9.
Lam, E., and Cooper, W.C., 1982, “Leaching of a low-grade oxide copper ore containing significant amounts of goethite,” Trans. Instn. Min. Metall. (Sect. C) Mineral Process Extr. Metall), the Institution of Mining and Metallurgy, Vol. 91.
Murr, L.E., 1980, “Theory and practice of copper sulphide leaching in dumps and in-situ,” Minerals Sci. Eng., Vol. 12, No. 3, pp. 121–189.
NICICO, 2002, Copper Metal, National Iranien Copper Industries (NICICO), Vol. 1, 121 pp., Vol. 2, 266 pp.
Oudenne, P.D., and Olson, F.A., 1983, “Leaching kinetics of malachite in ammonium carbonate solutions,” Metallurgical Transactions B, Vol. 14B, pp. 33–40.
Prasad, S., and Panedy, B.D., 1998, “Alternative processes for treatment of chalcopyrite — a review,” Minerals Engineering, Vol. 11, No. 8, pp. 763–781.
Razavizadeh, K., and Gee, R., 1989, “Characterisation of anode slimes from Sarcheshmeh containing barium sulphate,” Erzmetall, Vol. 42, No. 12, pp. 560–565.
Semenishin, E.M., Aksel’rud, G.A., and Limarenko, S.V., 1973, Insh. Fig. Zh., Vol. 25, No. 1, pp. 150–151.
Sheffer, H.W., Evans, and La Mar, G., 1968, “Copper leaching practices in the Western United States,” IC 8341, U.S. Bureau of Mines, 57 pp.
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Razavizadeh, H., Afshar, M.R. Leaching of Sarcheshmeh copper oxide ore in sulfuric acid solution. Mining, Metallurgy & Exploration 25, 85–90 (2008). https://doi.org/10.1007/BF03403391
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DOI: https://doi.org/10.1007/BF03403391