Effect of magnet scrap size on the extraction behavior of heavy rare earth elements by liquid metal extraction

Sun Woo Nam, Mohammad Zarar Rasheed, Sang Min Park, Sang Hoon Lee, Do Hyang Kim, Taek Soo Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Liquid metal extraction (LME) process results in 100% neodymium (Nd) extraction but the highest extraction efficiency reported for Dysprosium (Dy) so far is 74%. Oxidation of Dy is the major limiting factor for incomplete Dy extraction. In order to enhance the extraction efficiency and to further investigate the limiting factors for incomplete extraction, experiments were carried out on six different particle sizes of under 200 μm, 200-300 μm, 300-700 μm, 700-1000 μm, 1000-2000 μm and over 2000 μm at 900°C with magnesium-to-magnet scrap ratio of 15:1 for 6, 24 and 48 hours, respectively. This research identified Dy2Fe17 in addition to Dy2O3 phase to be responsible for incomplete extraction. The relationship between Dy2Fe17 and Dy2O3 phase was investigated, and the overall extraction efficiency of Dy was enhanced to 97%.

Original languageEnglish
Pages (from-to)1273-1276
Number of pages4
JournalArchives of Metallurgy and Materials
Issue number4
Publication statusPublished - 2020

Bibliographical note

Funding Information:
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

Publisher Copyright:
© 2020. The Author(s).

All Science Journal Classification (ASJC) codes

  • Metals and Alloys


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