Influence of anode current density on carbon parasitic reactions during electrolysis  

作　　者：Tongxiang Ma Lang Zhao Yu Yang Liwen Hu Shengfu Zhang Meilong Hu 

机构地区：[1]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

出　　处：《Chinese Journal of Chemical Engineering》2021年第11期314-319,共6页中国化学工程学报（英文版）

基　　金：the National Natural Science Foundation of China(51674054);supported by the Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials,Chongqing University,China.

摘　　要：In the electro-deoxidation process,carbon parasitic reaction(CO_(3)^(2-)+4e–=C+3O^(2-))usually occurs when using carbon materials as the anode,which leads to increase of the carbon content in the final metal and decrease of the current efficiency of the process.The aim of this work is to reduce the negative effect of carbon parasitic reaction on the electrolysis process by adjusting anode current density.The results indicate that lower graphite anode area can achieve higher current density,which is helpful to increase the nucleation site of CO_(2) bubbles.Most of CO_(2) would be released from the anode instead of dissolution in the molten CaCl_(2) and reacting with O^(2-)to form CO_(3)^(2-),thus decreasing the carbon parasitic reaction of the process.Furthermore,the results of the compared experiments show that when the anode area decreases from 172.78 to 4.99 cm^(2),CO_(2) concentration in the released gases increases significantly,the carbon mass content in the final metal product decreased from 1.09%to 0.13%,and the current efficiency increased from 6.65%to 36.50%.This study determined a suitable anode current density range for reducing carbon parasitic reaction and provides a valuable reference for the selection of the anode in the electrolysis process.

关 键 词：Anode area Anode current density Carbon parasitic reactions Current efficiency 

分 类 号：TQ151[化学工程—电化学工业]