Abstract
Willemite is usually found in high-silicon oxide zinc ore and zinc metallurgical secondary resources but without effective extraction method yet. In this study, zinc was extracted from willemite by sodium salt roasting and ammonia-leaching process based on the idea of zinc phase reconstruction. The effects of Na2CO3 dosage, roasting temperature and roasting time on phase transformation and zinc leaching rate were studied, respectively. The results show that Zn2SiO4 was transformed into ZnO or Na2ZnSiO4 during roasting process. After roasting at 800 °C for 2.5 h at ratio of n(Na2CO3)/n(Zn2SiO4) = 2.5:1, willemite was thoroughly transformed into ZnO. The zinc leaching rate of the roasted sample was 97.62% in NH4Cl–NH3–H2O leaching system, which increased by 91.57% compared with zinc leaching rate of 6.05% when willemite was directly leached in NH4Cl–NH3–H2O system.
This is a preview of subscription content, log in via an institution to check access.
References
Y.M. Zhang, J. Li, Influence of ultrasonic irradiation on ammonia leaching of zinc from low-grade oxide zinc ore. Chin. J. Nonferrous Met. 19(5), 961–966 (2009)
A. Chen, Z. Zhao, D. Xu et al., Effect of sodium silicate on the solubility of zinc oxide of the Na2O–ZnO–H2O equilibrium system. Hydrometallurgy 136(4), 46–50 (2013)
W.Q. Qin, Mineralogical characterization of blast furnace slag quenched by water. Chin. J. Nonferrous Met. 24(1), 262–268 (2014)
X.Z. Guo, B.H. Zhang, H.B. Yang et al., Melting-reduction of low-grade zinc oxide ores. Min. Metall. Eng. 23(2), 57–60 (2003)
G. Strohmeier, J.E. Bonestell, Steel works residues and the Waelz kiln treatment of electric arc furnace dust. Iron Steel Engineer 73(4) (1996)
L.Z. Xiong, Q.Y. Chen, Z.L. Yin et al., Preparation of metal zinc from hemimorphite by vacuum carbothermic reduction with CaF2, as catalyst. Trans. Nonferrous Met. Soc. China 22(3), 694–699 (2012)
Z.Y. Liu, Z.H. Liu, Leachingmechanism of willemitein (NH4)2SO4-NH3·H2O system. Trans. Nonferrous Met. Soc. China 21(11), 2929–2935 (2011)
H.S Xu, C Wei, Sulfuric acid leaching of zinc silicate ore under pressure. Hydrometallurgy 105, 186–190 (2010)
Z.W. Zhao, X.J. Jia, A.L. Chen et al., Leaching zinc oxide ore in alkaline solution. J. Central South Univ. 41(1), 39–43 (2010)
Z.W. Zhao, L. Shuang, A.L. Chen et al., Alkali leaching of refractory high silica zinc oxide ore by mechanical activation. Zhongnan Daxue Xuebao 41(4), 1246–1250 (2010)
Z. Liu, Z. Liu, Q. Li et al., Dissolution behavior of willemite in the (NH4)2SO4–NH3–H2O system. Hydrometallurgy 125–126, 50–54 (2012)
Acknowledgements
The authors are grateful to Major State Basic Research Development Program of China (973 Program Grant No. 2014CB643403).
Author information
Authors and Affiliations
Corresponding authors
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2017 The Minerals, Metals & Materials Society
About this paper
Cite this paper
Liu, X., Fu, G., Guo, Y., Jiang, T., Chen, W., Tan, Y. (2017). Extraction of Zinc from Willemite by Sodium Salt Roasting and Ammonia-Leaching Process. In: Hwang, JY., et al. 8th International Symposium on High-Temperature Metallurgical Processing. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-51340-9_30
Download citation
DOI: https://doi.org/10.1007/978-3-319-51340-9_30
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-51339-3
Online ISBN: 978-3-319-51340-9
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)