Abstract
Willemite is typically found in oxidized zinc ores and metallurgical secondary resources but without effective extraction method yet. Based on the ideas of zinc phase reconstruction in the willemite, the extraction of zinc from willemite by calcified-roasting using CaO as additive and ammonia-leaching process was studied in this paper. The influences of CaO dosage, roasting temperature, roasting time on the phase transformation and zinc leaching rate were studied, which were characterized by XRD. The results indicated that Zn2SiO4 was transformed into ZnO or Zn2CaSi2O7 .After roasted with 1.4 times of theoretical CaO dosage at l280 “Cfor 40 minutes, willemite was thoroughly transformed into ZnO. The zinc leaching rate of the roasted sample was 97.45% in NH4Cl-NH3-H2O leaching system, which increased by 91.40 % compared with zinc leaching rate of 6.05% when willemite was directly leached in NH4Cl-NH3-H2O system.
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References
Y.M. Zhang, J Li, “Influence of ultrasonic irradiation on ammonia leaching of zinc from low-grade oxide zinc ore,” The Chinese Journal of Nonferrous Metals, 2009, 19(5), 961–966.
H.S. Xu, Research on sulfuric acid leaching of zinc silicate ore, (Ph.D thesis Kunming University of Science and Technology, 2014).
W.Q. Qin, Mneralogical characterization of blast furnaces lag quenched by water, The Chinese Journal of Nonferrous Metals, 2014, 24(1), 262–268.
P Wu, The mineralogical characteristics of Pb and Zn in zinc waste, Acta mineralogica sinica, 2002, 22(1), 39–42.
A.L Chen, Z.W. Zhao, Comprehensive Utilization Status and Expectation of Zinc Oxide Ores, Mining and metallurgical engineering, 2008, 28(6), 62–66.
L.Z Xiong, Q.Y. Chen, Preparation of metallic zinc from hemimorphite by vacuum carbothermic reduction with CaF2 as catalyst. Transaction of nonferrous metals society of China, 2011
Z.Y. Liu, Z.H. Liu, Leaching mechanism of willemite in (NH4)2SO4-NH3’H2O system, Transaction of nonferrous metals society of China, 2011, 21(11), 2929–2935
H.S Xu, C Wei, Sulfuric acid leaching of zinc silicate ore under pressure, Hydrometallurgy ,2010, 105, 186–190
ZW. Zhao, X.J. Jia, Leachingzinc oxide ore in alkaline solution, Journal of Central South University (Science and Technology), 2010, 41(1), 39–43
ZW. Zhao, S Long, Alkali leaching of refractory high silica zinc oxide ore by mechanical activation, Journal of Central South University (Science and Technology), 2010, 41 (4), 1246–1250
Z.Y. Liu, Dissolution behavior of willemite in the (NH4)2SO4-NH3-H2O system, Hydrometallurgy vanadium titanium, 2012, 33(1), 30–34
S Bei, Z.J. Wang, Review of vanadium extraction from stone coal by roasting technique with sodium chloride and calcium oxide, Chinese journal of rare metals, 2010, 34(2), 291–297
Z.Y. Liu, Leaching mechanism of zinc oxide ores in ammonia-ammonium aqueous solution, (Ph.D thesis, Central South University, 2012)
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Chen, W., Guo, Y., Chen, F., Jiang, T., Liu, X. (2016). The Extraction of Zinc from Willemite by Calcified-Roasting and Ammonia-Leaching Process Based on Phase Reconstruction. In: Hwang, JY., et al. 7th International Symposium on High-Temperature Metallurgical Processing. Springer, Cham. https://doi.org/10.1007/978-3-319-48093-0_14
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DOI: https://doi.org/10.1007/978-3-319-48093-0_14
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48617-8
Online ISBN: 978-3-319-48093-0
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