等离子区域熔炼提纯金属Y过程中的杂质迁移规律  

Migration Laws of Impurities in Purification Process of Yttrium Metal by Plasma Zone Melting

作　　者：徐明磊 卢文礼 张小伟 陈德宏 李金颖 余创 杨文晟 王志强 Xu Minglei;Lu Wenli;Zhang Xiaowei;Chen Dehong;Li Jinying;Yu Chuang;Yang Wensheng;Wang Zhiqiang(GRIREM Hi-Tech Co.,Ltd,Langfang 065201,China;GRIREM Advanced Materials Co.,Ltd,Beijing 100088,China;National Engineering Research Center for Rare Earth,Beijing 100088,China;School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]有研稀土高技术有限公司,河北廊坊065201 [2]有研稀土新材料股份有限公司,北京100088 [3]稀土国家工程研究中心,北京100088 [4]北京科技大学冶金与生态工程学院,北京100083

出　　处：《稀有金属材料与工程》2024年第6期1543-1548,共6页Rare Metal Materials and Engineering

基　　金：National Key Research and Development Program of China(2022YFB3504401);National Science and Technology Major Project of China(J2019-VI-0023-0140)。

摘　　要：利用等离子体区域熔炼提纯金属钇,获得了区熔提纯过程中Al、Si、Fe、Ni、Cu和Mo等杂质的迁移规律。计算结果表明,金属钇中Al、Si、Fe、Ni、Cu和Mo等常见杂质的平衡分配系数分别是0.2173、0.2201、0.5065、0.1586、0.1742和0.8576。由于上述杂质平衡分配系数小于1,杂质在液相中的溶解度大于固相溶解度,所以从理论上可判断出Al、Si、Fe、Ni、Cu和Mo等杂质将随着熔区移动富集在金属钇锭的尾端,也就是最后凝固区。实验结果证明了该理论预判的准确性。此外,探究了区熔次数与杂质迁移的内在联系,结果表明:随着区熔次数由5次增加至10次,杂质在金属钇锭尾端富集程度增加,即去除率升高。10次区熔后,Al、Si、Fe、Ni、Cu和Mo等杂质的去除率分别为45.71%、61.54%、33.98%、64.15%、52.14%和46.28%。由于上述杂质饱和蒸气压与金属钇接近,所以很难通过常规方法予以去除。等离子体区域熔炼提纯金属钇的研究为制备高纯钇提供了一种新方向。Metal Y was purified by plasma zone melting,and the migration laws of Al,Si,Fe,Ni,Cu,and Mo impurities during the zone melting purification process were obtained.Calculation results show that the equilibrium distribution coefficients of the Al,Si,Fe,Ni,Cu,and Mo impurities in metal Y are 0.2173,0.2201,0.5065,0.1586,0.1742,and 0.8576,respectively.Because all equilibrium distribution coefficients are less than 1,the solubility of impurities in the liquid phase is greater than that in the solid phase.Therefore,theoretically,with the movement of molten zone,the Al,Si,Fe,Ni,Cu,and Mo impurities will be concentrated in the tail side of Y metal ingot,namely last-to-freeze zone.Experiment results demonstrate the correctness of the theoretical calculation.Besides,the internal relationship between the zone melting times and the impurity migration was investigated.Results show that with the increase in the zone melting time from 5 to 10,the concentration degree of impurities at the tail side of Y metal ingot is increased,i.e.,the removal ratio is increased.After 10 times of zone melting,the removal ratios of Al,Si,Fe,Ni,Cu,and Mo impurities are 45.71%,61.54%,33.98%,64.15%,52.14%,and 46.28%,respectively.Because the saturated vapor pressure of the abovementioned impurities is similar to that of metal Y,impurities are difficult to be removed by the common methods.The investigation of plasma zone melting proposes a new research direction for the preparation of high purity Y.

关 键 词：迁移规律 等离子体区域熔炼 分配系数 钇 去除效率 

分 类 号：TF845.2[冶金工程—有色金属冶金]