Kinetics of chalcopyrite leaching in the aqueous medium of ethylene glycol-hydrogen peroxide-sulfuric acid
Abstract
It has been found that the addition of ethylene glycol (EG) in a sulfuric acid-hydrogen peroxide leaching solution enhances the dissolution of copper from chalcopyrite. Therefore, in this work the dissolution kinetics of copper from chalcopyrite in the aqueous medium of 0.7M sulfuric acid-1M hydrogen peroxide-3.5M EG was evaluated. Copper leaching from chalcopyrite was fitted to a decreasing particle model controlled by chemical reaction, under pseudo-first order kinetics and an activation energy of 66.5 kJ/mol. Temperature had a positive effect on copper leaching in the range of 10-30°C. However, copper leaching was negatively affected at temperatures of 40 and 50°C, due to the decomposition of hydrogen peroxide due to thermal effect.
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References
AASHTO., 2009. Standard test method for materials finer than 75-μm (No. 200) sieve in mineral aggregates by washing.
Adebayo, A. O., Ipinmoroti, K. O., Ajayi, O. O., 2003. Dissolution kinetics of chalcopyrite with hydrogen peroxide in sulphuric acid medium. Chemical and biochemical engineering quarterly, 17(3), 213-218.
Agacayak, T., Aras, A., Aydogan, S., Erdemoglu, M., 2014. Leaching of chalcopyrite concentrate in hydrogen peroxide solution. Physicochemical Problems of Mineral Processing, 50(2), 657-666.
Ghomi, M. A., Mozammel, M., Moghanni, H., Shahkar, L., 2019. Atmospheric leaching of chalcopyrite in the presence of some polar organic reagents: A comparative study and optimization. Hydrometallurgy, 189, 105120.
Mahajan, V., Misra, M., Zhong, K., Fuerstenau, M. C., 2007. Enhanced leaching of copper from chalcopyrite in hydrogen peroxide–glycol system. Minerals Engineering. 20(7), 670-674.
Nicol, M. J., 2020. The role and use of hydrogen peroxide as an oxidant in the leaching of minerals. 1. acid solutions. Hydrometallurgy, 105328.
R. Cruz, R.M. Luna-Sánchez, G.T. Lapidus, I. González, M. Monroy., 2005. An experimental strategy to determine galvanic interactions affecting the reactivity of sulfide mineral concentrates, Hydrometallurgy 78 (3-4) 198–208.
Ruiz-Sánchez, A., Lapidus, G. T., 2022a. A study to understand the role of ethylene glycol in the oxidative acid dissolution of chalcopyrite. Minerals Engineering, 180, 107502.
Ruiz-Sánchez, Á., Lapidus, G. T., 2017. Study of chalcopyrite leaching from a copper concentrate with hydrogen peroxide in aqueous ethylene glycol media. Hydrometallurgy. 169, 192-200.
Ruiz-Sánchez, A., Lapidus, G. T., 2022b. Electrochemical and leaching studies to better understand the role of ethylene glycol in the oxidative acid dissolution of chalcopyrite. Electrochimica Acta, 418, 140343.
Ruiz-Sánchez, A., Lázaro, I., Lapidus, G. T., 2020. Improvement effect of organic ligands on chalcopyrite leaching in the aqueous medium of sulfuric acid‑hydrogen peroxide-ethylene glycol. Hydrometallurgy, 193, 105293.
Solís-Marcial, O. J., Lapidus, G. T., 2014. Chalcopyrite leaching in alcoholic acid media. Hydrometallurgy, 147, 54-58.
Solís-Marcial, O. J., Lapidus, G. T., 2013. Improvement of chalcopyrite dissolution in acid media using polar organic solvents. Hydrometallurgy, 131, 120-126.
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