Abstract
This paper focuses on the selective leaching of zinc from high iron-bearing zinc calcines. The FactSage 6.2 program was used for the thermodynamic analysis of the selective reduction and leaching, and the samples reduced by carbon and carbon monoxide were subjected to acid leaching for the separation of zinc from iron. It is shown that the generation of ferrous oxide should be avoided by modifying V CO (P CO/(P CO + \( P_{{{\text{CO}}_{ 2} }} \))) in the roasting process prior to the selective leaching of zinc. Gaseous roasting–leaching has a higher efficiency in the separation of zinc from iron than carbothermic reduction–leaching. The conversion of the zinc ferrite in high iron-bearing zinc calcines to zinc oxide and magnetite has been demonstrated by x-ray diffraction (XRD) and magnetic hysteresis loop characterization. This gaseous roast–leach process is technically feasible to separate zinc from iron without an iron precipitation process.
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Acknowledgements
The authors would like to thank the National High Technology Research and Development Programme of China (2011AA061001), the Human Synergistic Innovation Center for the Clean and Efficient Utilization of the Strategic Metal Mineral Resource, the Cheung Kong Scholars Programme (T2011116) and the Major Science and Technology Project of Hunan Province of China (2014FJ1011) for financial support for this study.
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Peng, B., Peng, N., Min, XB. et al. Separation of Zinc from High Iron-Bearing Zinc Calcines by Reductive Roasting and Leaching. JOM 67, 1988–1996 (2015). https://doi.org/10.1007/s11837-015-1476-7
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DOI: https://doi.org/10.1007/s11837-015-1476-7