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

doi:10.1016/j.cjche.2016.01.006

Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (5): 671-676.DOI: 10.1016/j.cjche.2016.01.006

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

WeiWeng¹, Mingyong Wang², Xuzhong Gong², ZhiWang², Zhancheng Guo¹

1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2015-06-30 Revised:2015-12-15 Online:2016-06-14 Published:2016-05-28
Contact: Mingyong Wang
Supported by:
Supported by the National Basic Research Program of China (2013CB632606), the National Natural Science Foundation of China (51474200) and the Youth Innovation Promotion Association, CAS (2015036).

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

WeiWeng¹, Mingyong Wang², Xuzhong Gong², ZhiWang², Zhancheng Guo¹

1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

通讯作者: Mingyong Wang
基金资助:
Supported by the National Basic Research Program of China (2013CB632606), the National Natural Science Foundation of China (51474200) and the Youth Innovation Promotion Association, CAS (2015036).

Abstract

Abstract: 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℃ 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.

Key words: Molten salt electrolysis, NaVO₃, Thermodynamic analysis, Metallic vanadium, Decomposition voltage

摘要： 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℃ 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.

关键词: Molten salt electrolysis, NaVO₃, Thermodynamic analysis, Metallic vanadium, Decomposition voltage

WeiWeng, Mingyong Wang, Xuzhong Gong, ZhiWang, Zhancheng Guo. Thermodynamic analysis on the direct preparation of metallic vanadium from NaVO₃ by molten salt electrolysis[J]. Chin.J.Chem.Eng., 2016, 24(5): 671-676.

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

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

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