Electrochemical investigation of the anode processes in LiF-NdF3 melt with low oxygen content  

作　　者：Chen-ming Fan Shi-zhe Liu Jing-jiu Gu Shi-you Guan Jin-hua Zhao Bing Li 

机构地区：[1]School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Institute for Sustainable Energy,College of Sciences,Shanghai University,Shanghai 200444,China [3]Collaborative Innovation Center of Clean Energy,Longyan University,Longyan 364012,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2021年第3期398-403,共6页矿物冶金与材料学报（英文版）

基　　金：the National Natural Science Foundation of China(No.51774145).The“Minjiang Scholar”Program of Department of Education,Fujian Province,China was also acknowledged.

摘　　要：The oxidation of oxygen ions and the generation of an anode effect at a low oxygen content of 150 mg/kg were discussed in this paper.Cyclic voltammetry and square-wave voltammetry tests were conducted to explore the anodic processes of LiF-NdF_(3)melt after a lengthy period of pre-electrolysis purification at 1000℃(during which the oxygen content reduced from 413 to 150 mg/kg).The oxidation process of oxygen ions was found to have two stages:oxidation product adsorption and CO/CO_(2)gas evolution.The adsorption stage was controlled by diffusion,whereas the gas evolution was controlled by the electrochemical reaction.In comparison with oxygen content of 413 mg/kg,the decrease in the amplitude of the current at low oxygen content of 150 mg/kg was much gentler during the forward scanning process when the anode effect occurred.Fluorine-ion oxidation peaks that occurred at about 4.2 V vs.Li/Li+could be clearly observed in the reverse scanning processes,in which fluorine ions were oxidized and perfluorocarbons were produced,which resulted in an anode effect.

关 键 词：LiF-NdF_(3)melt neodymium electrowinning low oxygen content anode processes 

分 类 号：TF845[冶金工程—有色金属冶金]