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Rare Metals

pp 1–6 | Cite as

Migration regularities of impurity aluminum and copper in purification of metal lanthanum by solid-state electrotransport

  • Zhi-Qiang Wang
  • Zong-An Li
  • Jia-Min Zhong
  • De-Hong Chen
  • Xiao-Wei Zhang
  • Lin Zhou
Article
  • 35 Downloads

Abstract

In view of the previous studies on the migrations of impurity aluminum (Al) and copper (Cu) in purification of rare earth metal by solid-state electrotransport (SSE), there are still some questions about that which direction they migrate to and whether there are significant migrations or not. The metal lanthanum (La) was used as research object, and the effects of migration temperature and time on the distributions and migration regularities of impurity Al and Cu were investigated in the present study by increasing concentration of impurity Al and Cu in raw metal La. The impurity migration direction and removal difficulty were intuitively judged by the residual rate distribution curve of impurity. It is indicated that metal impurity Al and Cu in metal La at 800 °C with direct current are found to significantly migrate to anode and their residual rates near cathode decrease with the increase in migration temperature and prolongation of migration time. The relatively large vapor pressure of Al and Cu makes their residual rate distribution curves being low in middle and high in ends. When metal La was continuously purified for 100 h at 800 °C by SSE, the residual rates of impurity Al and Cu at 20 mm from cathode are 68.43% and 57.43%, respectively, showing that Cu is much easier to be removed than Al.

Keywords

Solid-state electrotransport Purification Residual rate Rare earth metal Lanthanum 

Notes

Acknowledgements

This study was financially supported by the National Basic Research Program of China (No. 2012CBA01207) and the National High Technology Research and Development Program of China (No. 2011AA03A409).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.National Engineering Research Center for Rare Earth Materials, Grirem Advanced Materials Co., Ltd.General Research Institute for Nonferrous MetalsBeijingChina

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