Impurity distribution in distillate of terbium metal during vacuum distillation purification  

杂质在真空蒸馏产物铽中的分布（英文）

作　　者：Xiao-wei ZHANG Rui-ying MIAO Dao-gao WU Qiong ZHU Zhi-qiang WANG De-hong CHEN Shi-hong YAN 张小伟;苗睿瑛;吴道高;朱琼;王志强;陈德宏;颜世宏(北京有色金属研究总院稀土材料国家工程研究中心,有研稀土新材料股份有限公司,北京100088)

机构地区：[1]National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals,Grirem Advanced Materials Co., Ltd., Beijing 100088, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第6期1411-1416,共6页中国有色金属学报（英文版）

基　　金：Project(51504036) supported by the National Natural Science Foundation of China;Project(2012CBA01207) supported by the National Basic Research Program of China;Project(2011AA03A409) supported by the National High-Tech Research and Development Program of China

摘　　要：The distribution rules of impurities in distilled terbium metal were investigated by vacuum distillation purificationexperiment and theoretical analysis.It is found that Ti impurity in distilled terbium is220mg/kg in the initial stage of the distillationpurification,increases slowly in the middle stage,and increases rapidly in the last stage,reaching2260mg/kg,and the modifiedseparation coefficient of Ti is1/19.02.The diffusion of the impurity Ti in liquid metal can reach a quasi-equilibrium state in theinitial stage of distillation purification and the calculated results agree well with experimental results;the distribution profile ofimpurity Cu is opposite to Ti,being380mg/kg in the initial stage,decreasing linearly to290mg/kg in the last stage,and themodified separation coefficient is17.99,and the theoretical calculated results are inconsistent with the experimental result.通过真空蒸馏实验和理论分析研究了杂质在蒸馏产物金属铽中的分布规律。研究结果表明:在蒸馏产物中,钛杂质在蒸馏初期的含量为220 mg/kg,在蒸馏中期杂质含量缓慢增加,到了蒸馏提纯末期,杂质含量高达2260 mg/kg,钛的修正分离系数为1/19.02,在蒸馏初始阶段,钛原子在液态金属中的扩散达到准稳态,且理论计算结果与实验结束相吻合;铜杂质的在蒸馏产物中的分布与钛相反,在蒸馏初始阶段铜含量为380 mg/kg,到了蒸馏提纯末期,铜含量线性降至290 mg/kg,其修正分离系数为17.99,理论计算结果与实验结果不一致。

关 键 词：vacuum distillation purification modified separation coefficient terbium metal impurity distribution liquid metal 

分 类 号：TG146.45[一般工业技术—材料科学与工程]