Determination of ohmic/voltage drop and factors influencing anodic overvoltage of carbon anodes in Na_3AlF_6-Al_2O_3 based melts  

作　　者：李庆余 李劼 田忠良 张刚 

机构地区：[1]School of Metallurgical Science and Engineering

出　　处：《中国有色金属学会会刊：英文版》2003年第3期699-703,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(G19990 64 90 3 )supportedbytheNationalKeyFundamentalResearchandDevelopmentProgramofChina

摘　　要：Experimental technique has been inadequate to anodic overvoltage measurements in aluminum electrolysis. To determine its ohmic/voltage drop precisely, a current interruption technique was modified with a high frequency digital oscilloscope, current interrupters with fast switching time, an improved cell configuration and a simulation applied to the oscillating potential decay curve. The results show that the technique can give good reproducibility for overvoltage studies. A substantial increase of anodic overvoltage is observed with graphite powder addition, metallic aluminum addition and CO bubbling in the melts.Experimental technique has been inadequate to anodic overvoltage measurements in aluminum electrolysis. To determine its ohmic/voltage drop precisely, a current interruption technique was modified with a high frequency digital oscilloscope, current interrupters with fast switching time, an improved cell configuration and a simulation applied to the oscillating potential decay curve. The results show that the technique can give good reproducibility for overvoltage studies. A substantial increase of anodic overvoltage is observed with graphite powder addition, metallic aluminum addition and CO bubbling in the melts.

关 键 词：炼铝 碳阳极 电解 阳极过电压 Na3AlF6-Al2O3 滴定分析 一氧化碳 

分 类 号：TF351[冶金工程—冶金机械及自动化]