Recovery and separation of Fe and Mn from simulated chlorinated vanadium slag by molten salt electrolysis
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第12期
论文作者：Shi-yuan Liu Yu-lan Zhen Xiao-bo He Li-jun Wang Kuo-chih Chou
摘 要：Tailings from the vanadium extraction process are discarded each year as waste, which contain approximately 30 wt% of Fe. In our previous work, we extracted Fe and Mn from vanadium slag, and Fe and Mn existed in the form of FeCl2 and MnCl2 after chlorination by NH4 Cl to achieve effective and green usage of waste containing Fe and Mn. In this work, square wave voltammetry（SWV） and cyclic voltammetry（CV） were applied to investigate the electrochemical behaviors of Fe2+ and Mn2+ in Na Cl–KCl melt at 800°C. The reduction processes of Fe2+ and Mn2+ were found to involve one step. The diffusion coefficients of FeCl2 and Mn Cl2 in molten salt of eutectic mixtures Na Cl–KCl molten salt were measured. The electrodeposition of Fe and Mn were performed using two electrodes at a constant cell voltage. The Mn/Fe mass ratio of the electrodeposited product in Na Cl –KCl –2.13 wt%FeCl2–1.07 wt%Mn Cl2 was 0.0625 at 2.3 V. After the electrolysis of NaCl–KCl–2.13 wt%Fe Cl2–1.07 wt%MnCl2 melted at 2.3 V, the electrolysis was again started under 3.0 V and the Mn/Fe mass ratio of the electrodeposited product was 36.4. This process provides a novel method to effectively separate Fe and Mn from simulated chlorinated vanadium slag.
Shi-yuan Liu1,2，Yu-lan Zhen2，Xiao-bo He3，Li-jun Wang1，Kuo-chih Chou3
1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing
摘 要：Tailings from the vanadium extraction process are discarded each year as waste, which contain approximately 30 wt% of Fe. In our previous work, we extracted Fe and Mn from vanadium slag, and Fe and Mn existed in the form of FeCl2 and MnCl2 after chlorination by NH4 Cl to achieve effective and green usage of waste containing Fe and Mn. In this work, square wave voltammetry（SWV） and cyclic voltammetry（CV） were applied to investigate the electrochemical behaviors of Fe2+ and Mn2+ in Na Cl–KCl melt at 800°C. The reduction processes of Fe2+ and Mn2+ were found to involve one step. The diffusion coefficients of FeCl2 and Mn Cl2 in molten salt of eutectic mixtures Na Cl–KCl molten salt were measured. The electrodeposition of Fe and Mn were performed using two electrodes at a constant cell voltage. The Mn/Fe mass ratio of the electrodeposited product in Na Cl –KCl –2.13 wt%FeCl2–1.07 wt%Mn Cl2 was 0.0625 at 2.3 V. After the electrolysis of NaCl–KCl–2.13 wt%Fe Cl2–1.07 wt%MnCl2 melted at 2.3 V, the electrolysis was again started under 3.0 V and the Mn/Fe mass ratio of the electrodeposited product was 36.4. This process provides a novel method to effectively separate Fe and Mn from simulated chlorinated vanadium slag.
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