The sulfuric acid leaching kinetics of South African chromite was investigated. The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions. The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a proportional relationship. A modified shrinking particle model was developed to account for the change in reactive surface area, and the model was fitted to experimental data. The resulting model was observed to describe experimental findings very well. Kinetics analysis revealed that the leaching process is controlled by a chemical reaction under the employed experimental conditions and the activation energy of the reaction is 48 kJ·mol−1.
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Z. Ji, Development status of China’s chromium salts in recent 50 years, Inorg. Chem. Ind., 42(2010), No. 12, p. 1.
A. Senol, Amine extraction of chromium(VI) from aqueous acidic solutions, Sep. Purif. Technol., 36(2004), No. 1, p. 63.
E.J. Elzinga and A. Cirmo, Application of sequential extractions and X-ray absorption spectroscopy to determine the speciation of chromium in Northern New Jersey marsh soils developed in chromite ore processing residue (COPR), J. Hazard. Mater., 183(2010), No. 1–3, p. 145.
A.M. Amer, Processing of Ras-Shait chromite deposits, Hydrometallurgy, 28(1992), No. 1, p. 29.
P.Y. Shi, M.F. Jiang, and C.J. Liu, A Method of Preparation of Basic Chromic Sulfate, Chinese Patent, Appl. 1526646A, 2004.
P.Y. Shi, C.J. Liu, and M.F. Jiang, Separation of Chromium and Iron Ions from Multi-component Solution, Chinese Patent, Appl. 101974688A, 2011.
Z. Ji. Preparation of trivalent chromium compounds from chromite by acid-leaching technique, Inorg. Chem. Ind., 44(2012), No. 12, p. 1.
C.J. Liu, J. Qi, and M.F. Jiang, Experimental study on sulfuric acid leaching behavior of chromite with different temperature, Adv. Mater. Res., 361–363(2012), p. 628.
A. Geveci, Y. Topkaya, and E. Ayhan, Sulfuric acid leaching of Turkish chromite concentrate, Miner. Eng., 15(2002), No. 11, p. 885.
C.J. Liu and P.Y. Shi, The effect of sulfuric acid addition on the leaching behavior of chromite, Ind. Heat., 40(2011), p. 59.
C.J. Liu, P.Y. Shi, and M.F. Jiang, A Method of Leaching Process of Chromite, Chinese Patent, Appl. 101979679A, 2011.
P.Y. Shi and S.L. Liu, Experimental study on sulfuric acid leaching of chromite, J. Chin. Rare Earth Soc., 20(2002), Spec. Iss., p. 72.
Y. Abali, S.U. Bayca, and E. Mistincik, Kinetics of oxalic acid leaching of tincal, Chem. Eng. J., 123(2006), No. 1–2, p. 25.
F. Beolchini, M.P. Papini, L. Toro, M. Trifoni, and F. Vegliò, Acid leaching of manganiferous ores by sucrose: kinetic modelling and related statistical analysis, Miner. Eng., 14(2001), No. 2, p. 175.
F. Vegliò, M. Trifoni, F. Pagnanelli, and L. Toro, Shrinking core model with variable activation energy: a kinetic model of manganiferous ore leaching with sulphuric acid and lactose, Hydrometallurgy, 60(2001), No. 2, p. 167.
K.C. Liddell, Shrinking core models in hydrometallurgy: what students are not being told about the pseudo-steady approximation, Hydrometallurgy, 79(2005), No. 1–2, p. 62.
A. Mgaidi, F. Jendoubi, D. Oulahna, M.E. Maaoui, and J.A. Dodds, Kinetics of the dissolution of sand into alkaline solutions: application of a modified shrinking core model, Hydrometallurgy, 71(2004), No. 3–4, p. 435.
P.K. Gbor and C.Q. Jia, Critical evaluation of coupling particle size distribution with the shrinking core model, Chem. Eng. Sci., 59(2004), No. 10, p. 1979.
V. Safari, G. Arzpeyma, F. Rashchi, and N. Mostoufi, A shrinking particle-shrinking core model for leaching of a zinc ore containing silica, Int. J. Miner. Process., 93(2009), No. 1, p. 79.
K. Liu, Q.Y. Chen, Z.L. Yin, H.P. Hu, and Z.Y. Ding, Kinetics of leaching of a Chinese laterite containing maghemite and magnetite in sulfuric acid solutions, Hydrometallurgy, 125–126(2012), p. 125.
N. Habbache, N. Alane, S. Djerad, and L. Tifouti, Leaching of copper oxide with different acid solutions, Chem. Eng. J., 152(2009), No. 2–3, p. 503.
S.M.M. Nouri, H. Ale Ebrahim, and E. Jamshidi, Simulation of direct reduction reactor by the grain model, Chem. Eng. J., 166(2011), No. 2, p. 704.
E. Vardar, R.H. Eric, and F.K. Letowski, Acid leaching of chromite, Miner. Eng., 7(1994), No. 5–6, p. 605.
M.F. Jiang, Q. Zhao, C.J. Liu, P.Y. Shi, B. Zhang, D.P. Yang, H. Saxén, and R. Zevenhoven, Sulfuric acid leaching of South African chromite: Part 2. Optimization of leaching conditions, Int. J. Miner. Process., 130(2014), p. 102.
Q. Zhao, C.J. Liu, P.Y. Shi, B. Zhang, M.F. Jiang, Q.S. Zhang, H. Saxén, and R. Zevenhoven, Sulfuric acid leaching of South African chromite. Part 1: Study on leaching behavior, Int. J. Miner. Process., 130(2014), p. 95.
T. Yoshioka, T. Motoki, and A. Okuwaki, Kinetics of hydrolysis of poly(ethylene terephthalate) powder in sulfuric acid by a modified shrinking-core model, Ind. Eng. Chem. Res., 40(2001), No. 1, p. 75.
S.K. Sadrnezhaad, Kinetic Processes in Materials Engineering and Metallurgy, Amri Kabir Publication Organization, Tehran, 2004, p. 145.
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Zhao, Q., Liu, Cj., Shi, Py. et al. Sulfuric acid leaching kinetics of South African chromite. Int J Miner Metall Mater 22, 233–240 (2015). https://doi.org/10.1007/s12613-015-1066-2
- chromite ore treatment
- sulfuric acid
- leaching kinetics
- physical models