Thermodynamic analysis on the direct preparation of metallic vanadium from NaVO₃ by molten salt electrolysis

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• 作者：Wei Weng¹ ; Mingyong Wang² ; ^{mywang@ipe.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Xuzhong Gong² ; Zhi Wang² ; Zhancheng Guo¹
• 关键词：Molten salt electrolysis ; NaVO3 ; Thermodynamic analysis ; Metallic vanadium ; Decomposition voltage
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：24
• 期：5
• 页码：671-676
• 全文大小：1197 K

文摘

A novel and environmentally friendly route to directly prepare metallic vanadium from NaVO₃ by molten salt electrolysis is proposed. The feasibility about the direct electro-reduction of NaVO₃ to metallic vanadium is analyzed based on the thermodynamic calculations and experimental verifications. The theoretical decomposition voltage of NaVO₃ to metallic vanadium is only 0.47 V at 800 °C and much lower than that of the alkali and alkali earth metal chloride salts. The value is slightly higher than that of low-valence vanadium oxides such as V₂O₃, V₃O₅ and VO. However, the low-valence vanadium oxides can be further electro-reduced to metallic vanadium thermodynamically. The thermodynamic analysis is verified by the experimental results. The direct preparation of metallic vanadium from NaVO₃ by molten salt electrolysis is feasible.