Optimal V_(2)O_(3) extraction by sustainable vanadate electrolysis in molten salts  

作　　者：Bao-Yan Feng Zhong-Hua Zhao Yong-Zheng Jia Jia-Liang An Ming-Yong Wang 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China [2]Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Tungsten》2024年第1期141-149,共9页钨科技（英文）

基　　金：supported by the National Natural Science Foundation of China (51725401);Open Projects of State Key Laboratory of Advanced Metallurgy (41616013)。

摘　　要：Recently,an environmentally friendly electrolysis process of soluble vanadates is proposed and successfully confirmed for V_(2)O_(3) extraction.In this paper,the solubilities of various vanadates(i.e.NaVO_(3),Na_(4)V_(2)O_(7) and Na_(3)VO_(4))in NaCl molten salt are measured.The dependences of V_(2)O_(3) extraction on vanadate form,anode material and molten salt system are studied.A long-term electrolysis is carried out.The result indicates that the solubilities of all vanadates are high and meet electrolytic requirements.Compared to Na_(4)V_(2)O_(7) and Na_(3)VO_(4),NaVO_(3) exhibits larger current efficiency and lower electricity consumption.By using SnO_(2) anode instead of graphite anode,the current efficiency of NaVO_(3) electrolysis can be increased to 58.1%and carbon pollution is avoided at 700℃.The extraction rate of V_(2)O_(3) reaches 81.3%after long-term electrolysis of 51 h.This work optimizes the electrochemical preparation process of V_(2)O_(3) from various vanadates and contributes to the improvement of current efficiency and extraction rate.

关 键 词：Molten salt electrolysis VANADATE Vanadium trioxide Current efficiency 

分 类 号：TQ135.11[化学工程—无机化工]