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Recovery and separation of Fe and Mn from simulated chlorinated vanadium slag by molten salt electrolysis

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Abstract

Tailings from the vanadium extraction process are discarded each year as waste, which contain approximately 30wt% 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 NH4Cl 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 NaCl-KCl melt at 800°C. The reduction processes of Fe2+ and Mn2+ were found to involve one step. The diffusion coefficients of FeCl2 and MnCl2 in molten salt of eutectic mixtures NaCl-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 NaCl-KCl-2.13wt%FeCl2-1.07wt%MnCl2 was 0.0625 at 2.3 V. After the electrolysis of NaCl-KCl-2.13wt%FeCl2-1.07wt%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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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51904286, 51922003, 51774027, and 51734002) and the China Postdoctoral Science Foundation (No. 2019M650848).

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Authors and Affiliations

  1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Shi-yuan Liu & Li-jun Wang

  2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Shi-yuan Liu & Yu-lan Zhen

  3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Xiao-bo He & Kuo-chih Chou

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  1. Shi-yuan Liu
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  2. Yu-lan Zhen
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Correspondence to Li-jun Wang.

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Liu, Sy., Zhen, Yl., He, Xb. et al. Recovery and separation of Fe and Mn from simulated chlorinated vanadium slag by molten salt electrolysis. Int J Miner Metall Mater 27, 1678–1686 (2020). https://doi.org/10.1007/s12613-020-2140-y

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