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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 900oC 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 800oC 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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Authors and Affiliations

Mohammad Zarar Rasheed
1 2
ORCID: ORCID
Sun-Woo Nam
2
ORCID: ORCID
Sang-Hoon Lee
2
ORCID: ORCID
Sang-Min Park
2
ORCID: ORCID
Ju-Young Cho
2
ORCID: ORCID
Taek-Soo Kim
1 2
ORCID: ORCID

  1. University of Science and Technology, Industrial Technology, Daejeon, Republic of Korea
  2. Korea Institute for Rare Metals, Korea Institute of Industrial Technology, Incheon, Republic of Korea

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