Kinetics of Pressure Acid Leaching of Zinc from Zinc Silicate Ore

Abstract:

The present work is concerned with the kinetic study of pressure leaching of zinc silicate ore in sulfuric acid solutions. The effects of leaching temperature, particle size, sulfuric acid concentration and agitation speed on the zinc extraction were evaluated. The results obtained show that the zinc extraction increases with increasing sulfuric acid concentration and leaching temperature. The leaching kinetics was analyzed by using a shrinking core model with diffusion control given by: 1-2/3x-(1-x)^2/3=Kt, which represented well the experimental data. The apparent activation energy was determined to be 44.56kJ/mol at temperatures ranging between 80 and 140°C.

• Periodical: Advanced Materials Research (Volume 402)
• Pages: 266-271
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.402.266
• Online since: November 2011
• Authors: Hong Sheng Xu, Chang Wei, Cun Xiong Li, Yan Song, Zhi Gan Deng, Gang Fan
• Keywords: Diffusion Control, Leaching Kinetics, Pressure Acid Leaching, Zinc Silicate Ore

References

[1] W.Q. Qin, W.Z. Li, Z.Y. Lan, G.Z. Qiu, Simulated small-scale pilot plant heap leaching of low-grade oxide zinc ore with integrated selective extraction of zinc, Miner. Eng. 20 (2007) 694-700.

DOI: 10.1016/j.mineng.2007.01.004

[2] M.G. Bodas, Hydrometallurgical treatment of zinc silicate ore from Thailand, Hydrometallurgy 40 (1996) 37-49.

DOI: 10.1016/0304-386x(94)00076-f

[3] S. Espiari, F. Rashchi, S.K. Sadrnezhad, Hydrometallurgical treatment of tailings with high zinc content, Hydrometallurgy 82 (2006) 54-62.

DOI: 10.1016/j.hydromet.2006.01.005

[4] Y. Hua, Z. Lin, Z. Yan, Application of microwave irradiation to quick leach of zinc silicate ore, Miner. Eng. 15 (2002) 451-456.

DOI: 10.1016/s0892-6875(02)00050-x

[5] S. He, J. Wang, J. Yan, Pressure leaching of high silica Pb-Zn oxide ore in sulfuric acid medium, Hydrometallurgy 104 (2010) 235-240.

DOI: 10.1016/j.hydromet.2010.06.011

[6] C.X. Li, H.S. Xu, Z.G. Deng, X.B. Li, M.T. Li, C. Wei, Pressure leaching of zinc silicate ore in sulfuric acid medium, Trans. Nonferrous Met. Soc. China 20 (2010) 918-923.

DOI: 10.1016/s1003-6326(09)60236-3

[7] H.S. Xu, C. Wei, C.X. Li, G. Fan, Z.G. Deng, M.T. Li, X.B. Li, Sulfuric acid leaching of zinc silicate ore under pressure, Hydrometallurgy 105 (2010) 186-190.

DOI: 10.1016/j.hydromet.2010.07.014

[8] C.X. Li, C. Wei, H.S. Xu, M.T. Li, X.B. Li, Z.G. Deng, G. Fan, Oxidative pressure leaching of sphalerite concentrate with high indium and iron content in sulfuric acid medium, Hydrometallurgy 102 (2010) 91-94.

DOI: 10.1016/j.hydromet.2010.01.009

[9] D. Georgiou, V.G. Papangelakis, Sulphuric acid pressure leaching of a limonitic laterite: chemistry and kinetics, Hydrometallurgy 49 (1998) 23-46.

DOI: 10.1016/s0304-386x(98)00023-1

[10] O. Levenspiel, Chemical Reaction Engineering, third ed., John Wiley & Sons, New York, 1999.

[11] F. Habashi, Principles of Extractive Metallurgy, vol. 1, Gordon and Breach, New York, 1969.

[12] A.D. Souza, P.S. Pina, F.M.F. Santos, C.A. da Silva, V.A. Leão, Effect of iron in zinc silicate concentrate on leaching with sulphuric acid, Hydrometallurgy 95 (2009) 207-214.

DOI: 10.1016/j.hydromet.2008.05.049

[13] E. Olanipekun, A kinetic study of the leaching of a Nigerian ilmenite ore by hydrochloric acid, Hydrometallurgy 53 (1999) 1-10.

DOI: 10.1016/s0304-386x(99)00028-6