冰晶石熔体中钛离子的阴极过程研究  

Cathode Process Research on Ti Ion in Cryolite Melt

作　　者：秦臻[1] 杨昇[1] 栗万仲[1] 吕玲敏[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点试验室,郑州450052

出　　处：《有色金属（冶炼部分）》2006年第5期17-19,共3页Nonferrous Metals（Extractive Metallurgy)

基　　金：河南省重大科技攻关项目(032202060)

摘　　要：采用循环伏安法和计时电流法研究了冰晶石(Na_3AlF_6)熔体在1323K下Ti^(4+)在石墨电极和铝阴极的还原机理。结果表明：以TiO_2形式加入的Ti^(4+)在石墨电极上的还原是分两步进行的：Ti^(4+)+2e→Ti^(2+)及Ti^(2+)+2e→Ti,且电极反应可逆。而Ti^(4+)在铝阴极上的还原过程是一步还原的：Ti^(4+)+4e→Ti。电解质没有以中间价态存在的钛离子,其原因在于铝阴极具有较强的去极化作用。Reaction mechanism of Ti^4＋ into Ti on the graphite electrode and aluminum cathode in cryolite melt are studied by cyclic voltammetry and chronoamperometry at 1 323K. The results show that Ti^4＋ can be deoxidized to Ti on the graphite cathode, and the reduction is conducted by two steps： Ti^4＋ ＋ 2e→Ti2. and Ti^2＋ ＋ 2e→Ti, and the process is reversible. But the reduction of Ti^4＋ into Ti on the aluminum cathode is one step： Ti^4＋ ＋ 4e→Ti. Ti ion can＇ t exist by middle valence in the molten electrolyte. The reason is that the aluminum cathode has strong affection of depolarization.

关 键 词：钛 冰晶石熔盐 电化学还原 铝阴极 石墨电极 

分 类 号：TF821[冶金工程—有色金属冶金]