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Impurity distribution in distillate of terbium metal during vacuum distillation purification

Transactions of Nonferrous Metals Society of China 2017年第6期27卷 1411-1416页

作者： Xiao-wei ZHANG Rui-ying MIAO Dao-gao WU Qiong ZHU Zhi-qiang WANG De-hong CHEN Shi-hong YAN National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsGrirem Advanced Materials Co. Ltd. Beijing 100088 China

The distribution rules of impurities in distilled terbium metal were investigated by vacuum distillation purificationexperiment and theoretical *** 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/*** 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.

关键词： vacuum distillation purification modified separation coefficient terbium metal impurity distribution liquid metal

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Impurity distribution in metallic dysprosium during distillation purification

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Journal of Rare Earths 2016年第9期34卷 924-930页

作者：张小伟苗睿瑛李传军吴道高闫缓王志强陈德宏颜世宏李宗安 National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metalsand Grirem Advanced Materials Co.Ltd. Otto Schott Institute of Materials Research Friedrich Schiller University Jena

The distribution rules of impurities contents in distilled metallic dysprosium were researched, and a theoretical analysis was carried out. The research results indicated that, the content of impurity in distilled metal, such as Al and Fe, was lower in the ini-tial stage, increased slowly in the middle stage, and increased rapidly in the last stage during the process of distillation purification. The calculated method of separation coefficient of impurity in crude metal by content of impurity in distilled metal was not suitable for high pure metals, and the modified separation coefficient was proposed, and it equaled 1/6.1 and 1/16.9 for impurity Al and Fe. The physical process of distillation was coincident with that of solidification essentially, and solute re-distribution theory in solidify-ing front could be used to describe the impurity distribution near evaporating surface. In the former stage of distillation purification, the diffusion of impurity in liquid metal could reach a quasi-equilibrium state, the calculated result of impurity content in distilled metal agreed well with experiments. In the latter stage of distillation process, the diffusion rate of impurity in liquid metal decreased, and the content in distilled metal was larger than the calculated result.

关键词： vacuum distillation purification distilled dysprosium impurity distribution modified separation coefficient rare earths

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