Electrochemical Preparation of V₂O₃ from NaVO₃ and Its Reduction Mechanism

翁威¹，王明涌²，GONG Xuzhong²，WANG Zhi²，WANG Dong²，GUO Zhancheng¹

1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering,Institute of Process Engineering, Chinese Academy of Sciences

摘 要：Vanadium trioxide（V₂O₃） was directly prepared by NaVO₃ electrolysis in Na Cl molten salts. Electrolysis products were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and energy dispersive spectroscopy（EDS）. The existing state and electrochemical behavior of NaVO₃ were also studied. The results indicated that V₂O₃ can be obtained from NaVO₃. VC and C were also formed at high cell voltage, high temperature, and long electrolysis time. During electrolysis, NaVO₃ was dissociated to Na+ and VO₃-in Na Cl molten salt. NaVO₃ was initially electro-reduced to V₂O₃ on cathode and Na₂O was released simultaneously. Na₂CO₃ was formed due to the reaction between Na₂O and CO₂. The production of C was ascribed to the electro-reduction of CO₃^2-. VC was produced due to the reaction between C and V₂O₃.

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