摘要
通过循环伏安法,在700℃条件下,采用三电极系统对NaCl-KCl-Na2WO4熔盐体系的电化学特性进行分析,重点研究了钨(Ⅵ)离子在电化学还原过程中的热力学及动力学特性。结果表明,在稳定的NaCl∶KCl=1∶1熔融盐中,Na2WO4中W(Ⅵ)离子在阴极电解还原W(Ⅵ)到W过程分两步完成,其中由W(Ⅵ)到W(Ⅳ)是准可逆过程,由W(Ⅳ)到W为高度不可逆过程,且单质产物W具有部分可溶性,W(Ⅵ)的电化学还原过程由熔体中钨离子的扩散控制。
The electrochemical characteristics of NaCl-KCl-Na2WO4molten salt system were analyzed by cyclic voltammetry using a three-electrode system at 700℃.The thermodynamic and kinetic properties of tungsten(VI)ions in the electrochemical reduction process were mainly studied.The results show that the cathode electroreduction process of W(VI)ion in Na2WO4is accomplished in two steps in the stable NaCl∶KCl=1∶1molten salt system,including aquasi-reversible process of W(VI)to W(Ⅳ)and a highly irreversible process of W(Ⅳ)to W,with the reduction product W is partially soluble.The electrochemical reduction process of W(VI)is controlled by the tungsten ion diffusion in melt.
作者
房孟钊
廖春发
王旭
李伟
宁瑞
余珊
FANG Mengzhao;LIAO Chunfa;WANG Xu;LI Wei;NING Rui;YU Shan(Daye Nonferrous Metals Company,The Key Laboratory of Hubei Province for Metallurgy and Recycling of Nonferrous Metals,Huangshi 435002,China;College of Metallurgy and Chemical Engieering,Jiangxi University of Tech ology,Ganzhou 341000,China)
出处
《有色金属工程》
CAS
北大核心
2019年第11期39-44,共6页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(51074081)~~
关键词
循环伏安法
熔融盐
电解
钨离子
可逆过程
cyclic voltammetry
molten salt
electrolysis
tungsten ion
reversible process
