Process improvement and kinetic study on copper leaching from low-grade cuprite ores
Shaojun Bai 1, 2  
Xianyu Fu 1
Chunlong Li 2
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Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, PR China
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, Yunnan, PR China
Shaojun Bai   

Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, PR China, Room 224, Mining Building, Kunming University of Science and Technology, Kunming, 650093, China, 650093 Kunming, China
Physicochem. Probl. Miner. Process. 2018;54(2):300–310
Process improvement and kinetic study on copper leaching from low-grade cuprite ores in sulfuric acid solution are presented in this paper. Effects of major leaching parameters on copper leaching efficiency are determined. The results indicate that copper minerals in the raw ores are mainly cuprites. The reaction rate of this ore increases with an increase in temperature, reaction time, sulfuric acid concentrations and decrease in the particle size of ore. Leaching of about 92.5% of copper is achieved using 0.125-0.074 mm ore particle size at a reaction temperature of 353 K for 180 min reaction time with 150 g/dm3 sulfuric acid. The solid/liquid ratio was maintained constant at 1:15. Leaching kinetic indicates experimental data complies with shrinking core mode (SCM). It is found in the study that agitation rate is not an influential factor on leaching rate and that the dissolution rate is controlled by surface chemical reaction. The average activation energy of the process is determined to be 45.28 kJ mol-1, and the reaction order of H2SO4 is 0.8093.
Abdel-Aal, E. A., 2000, Kinetics of sulfuric acid leaching of low-grade zinc silicate ore, Hydrometallurgy. 55, 247-254.
Akretche, D.E., Kara Slimane, S., and Kerdjoudj, H., 1995, Selective leaching of a polymetallic complex ore by sulphuric acid and thiourea mixed with sea water, Hydrometallurgy. 38, 189-204.
Baba, A. A. and F. A. Adekola., 2010, Hydrometallurgical processing of a nigerian sphalerite in hydrochloric acid: characterization and dissolution kinetics, Hydrometallurgy. 101, 69-75.
Bingöl, D., and Canbazoğlu, M., 2004, Dissolution kinetics of malachite in sulphuric acid, Hydrometallurgy. 72, 159-165.
Droppert, D.J., and Shang, Y., 1995, The leaching behaviour of nickeliferous pyrrhotite concentrate in hot nitric acid, Hydrometallurgy. 39, 169-182.
Ekenes, J.M., and Caro, C.A., 2013, Improving leaching recovery of copper from low-grade chalcopyrite ores, MINERALS & METALLURGICAL PROCESSING. 30, 180-185.
Ekinci, Z., Colak, S., Cakici, A., and Sarac, H., 1998, Leaching kinetics of sphalerite with pyrite in chlorine saturated water. Minerals Engineering. 19, 279-283.
Fugleberg, S., Hutholm, S.E., Rosenback, L., and Holohan, T., 1995, Development of the hartley platinum leaching process, Hydrometallurgy. 9, 1-10.
Georgios, N., Anastassakis., 2002, Separation of Fine Mineral Particles by Selective Magnetic Coating, Journal of Colloid and Interface Science. 256, 114-120.
Grizo, A., Pacović, N., Poposka, F., and Koneska, Ž., 1982, Leaching of a low-grade chalcocite-covellite ore containing iron in sulphuric acid: The influence of pH and particle size on the kinetics of copper leaching, Hydrometallurgy. 8, 5-16.
Habbache, N., Alane, N., Djerad, S., and Tifouti, L., 2009, Leaching of copper oxide with different acid solutions, Chemical Engineering Journal. 152, 503-508.
Haghighi, H. K., Moradkhani, D., Sedaghat, B., Najafabadi, M. R., and Behnamfard, A., 2013, Production of copper cathode from oxidized copper ores by acidic leaching and two-step precipitation followed by electrowinning, Hydrometallurgy. 133, 111-117.
Jena, P. K., Barbosa, O. and Vasconcelos, I. C., 1999, Studies on the kinetics of slurry chlorination of a sphalerite concentrate by chlorine gas, Hydrometallurgy. 52, 111-122.
Kosyakov, A., Hamalainen, M., Gromov, P., Kasikov, A., Masloboev, V., and Neradovsky, Yu., 1995, Autoclave processing of low grade copper-nickel concentrates, Hydrometallurgy. 39, 223-234.
Künkül, A., Gülezgin, A., and Demirkiran, N., 2013, Investigation of the use of ammonium acetate as an alternative lixiviant in the Leaching of malachite ore, Chemical Industry and Chemical Engineering Quarterly. 19, 25-34.
Levenspiel, O., 1999, Chemical Reaction Engineering, Industrial and Engineering Chemistry Research. 38, 4140-4143..
Marsden, J. O., and Wilmot, J. C., 2007, Medium-temperature pressure leaching of copper concentrates-Part 1: Chemistry and initial process development, MINERALS & METALLURGICAL PROCESSING. 24, 193-204.
Padilla, R., Vega, D., and Ruiz, M.C., 2007, Pressure leaching of sulfidized chalcopyrite in sulfuricacid-oxygen media, Hydrometallurgy. 86, 80-88..
Razavizadeh, H and Afshar, M.R., 2008, Leaching of Sarcheshmeh copper oxide ore in sulfuric acid solution, MINERALS & METALLURGICAL PROCESSING. 25, 85-90.
Sabba, N., and Akretche, D.E., 2006, Selective leaching of a copper ore by an electromembrane process using ammonia solutions, Minerals Engineering. 19, 123-129.
Souza, A.D., Pina, P.S., Lima, E.V.O., da Silva, C.A., and Leão, V.A., 2007, Kinetics of sulphuric acid leaching of a zinc silicate calcine. Hydrometallurgy. 89, 337-345..
Sun, X.L., Chen, B.Z., Yang, X.Y., Liu, Y.Y., 2009, Technological conditions and kinetics of leaching copper from complex copper oxide ore. J. Cent. South Univ. Technol. 16, 936-941.
Van der merwe, R., and Kasaini, H., 2011, Leaching characteristics of copper refractory ore in sulfate media, MINERALS & METALLURGICAL PROCESSING. 28, 208-214.
Wu, D.D., Wen, S.M., Deng,J.S., and Liu, J., 2013, Dissolution kinetics of malachite as an alternative copper source with an organic leach reagent, Journal of Chemical Engineering of Japan. 46, 677-682.
Xiong, K., Wen, S.M., Zheng, G.S., Bai, S.J., and Shen, H.Y., 2012, Flotation research on cuprite-type oxide copper in Xin Jiang, Advanced Materials Research. 524-527, 987-992.
Yan, W., and Cai, W.l., 2000, Reaction Kinetics of Acidic Leaching of Composite Copper ore, Engineering Chemistry and Metallurgy. 21, 298-301.