电解过程中非稀土杂质的行为  

Electrochemical Behavior of Non RE Impurities in Electrowinning Process

作　　者：王林生[1] 杨幼明[1] 胡珊玲[1] 温惠忠[1] 游宏亮[1] 

机构地区：[1]赣州有色冶金研究所,江西赣州341000

出　　处：《稀土》1999年第6期16-20,共5页Chinese Rare Earths

基　　金：863 计划资助

摘　　要：研究了氟化物体系熔盐电解制备电池用稀土金属时非稀土杂质的行为，并进行了理论分析。结果表明，杂质离子的放电行为受其在电解质熔盐中的结合状态影响：电位较ＲＥ３＋ 正的杂质离子优先放电进入金属中，这些离子在电解质中的含量较低；电位较ＲＥ３＋ 负的杂质离子难于放电析出，主要积累于熔盐中；Ｃ通过形成碳化稀土和物理溶解两种方式进入稀土金属，选择合理的工艺条件可获得Ｃ含量较低的稀土金属。The electrochemical behavior of non RE impurities in the melting salt in mischmetal electrowinning process was studied and analyzed theoretically.The results show that the behavior of impurity ions is affected by their combined characteristic.Ions, their oxide theoretical decomposition voltage is smaller than RE oxide, deposited preferentially, the content of these elements in electrolyte is very low. Ions with voltage higher than RE oxide are difficult to electrowin and remain mostly in the melting salt. C exists in RE metal in the form of carbonide and dissolved state, its content in RE metal can be declined by selecting reasonable technological parameter.

关 键 词：氟化物熔盐 非稀土杂质 稀土金属 电解制备 

分 类 号：TF845[冶金工程—有色金属冶金] TF803.27