Archives of Metallurgy and Materials

Institute of Metallurgy and Materials Science of Polish Academy of Sciences
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Phase Evolution During Extraction and Recovery of Pure Nd from Magnet

  • Mohammad Zarar Rasheed (University of Science and Technology, Industrial Technology) ;
  • Sun-Woo Nam (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Sang-Hoon Lee (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Sang-Min Park (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Ju-Young Cho (Korea Institute for Rare Metals, Korea Institute of Industrial Technology) ;
  • Taek-Soo Kim (University of Science and Technology, Industrial Technology)
  • Published : 20210000
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Abstract

Liquid Metal Extraction process using molten Mg was carried out to obtain Nd-Mg alloys from Nd based permanent magnets at 900℃ for 24 h. with a magnet to magnesium mass ratio of 1:10. Nd was successfully extracted from magnet into Mg resulting in ~4 wt.% Nd-Mg alloy. Nd was recovered from the obtained Nd-Mg alloys based on the difference in their vapor pressures using vacuum distillation. Vacuum distillation experiments were carried out at 800℃ under vacuum of 2.67 Pa at various times for the recovery of high purity Nd. Nd having a purity of more than 99% was recovered at distillation time of 120 min and above. The phase transformations of the Nd-Mg alloy during the process, from Mg12Nd to α-Nd, were confirmed as per the phase diagram at different distillation times. Pure Nd was recovered as a result of two step recycling process; Liquid Metal Extraction followed by Vacuum Distillation.

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Acknowledgement

This research was supported by a grant from project of development of environment friendly pyrometallurgy process for high purity HREE and materialization (Project number: 20000970) by Korea evaluation Institute of Industrial Technology (KEIT) in Republic of Korea