Scrap combination for recycling of valuable metals: Direct extraction and recovery of neodymium metal from magnet scraps

Toru H. Okabe, Osamu Takeda, Kazuhiro Fukuda, Yoshiaki Umetsu

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

A fundamental study was conducted with the purpose of establishing an environmentally sound recovery process for recycling of valuable metals, by combining scraps containing such metals. As an example, direct extraction and recovery of neodymium (Nd) in magnet scraps was investigated by utilizing liquid metal as an extraction medium. It was found that liquid magnesium (Mg) is a suitable extraction medium and can extract Nd from iron alloys with high efficiency at around 1100 K. The newly developed extraction apparatus for Nd is a mechanically simple and static device without moving parts, where the Mg extraction medium circulates due to differences in the temperature inside the reaction vessel. This developed device can simultaneously accomplish continuous extraction of metal Nd from scraps, re-extraction of Mg from Mg-Nd alloy and the eventual recovery of pure Mg. As a result, metal Nd with 98% purity was directly recovered from magnet scraps under certain conditions. It was also shown that the extraction agent Mg could be reused. The results of this investigation show the possibility of establishing a new process for the direct extraction of Nd in pure metal form without oxidization.

本文言語English
ホスト出版物のタイトルYazawa International Symposium
ホスト出版物のサブタイトルMetallurgical and Materials Processing: Principles and Techologies; Materials Processing Fundamentals and New Technologies
編集者F. Kongoli, K. Itagaki, C. Yamauchi, H.Y. Sohn, F. Kongoli, K. Itagaki, C. Yamauchi, H.Y. Sohn
ページ1079-1091
ページ数13
出版ステータスPublished - 2003 10月 16
イベントYazawa International Symposium: Metallurgical and Materials Processing: Principles and Technologies; Materials Processing Fundamentals and New Technologies - San Diego, CA, United States
継続期間: 2003 3月 22003 3月 6

出版物シリーズ

名前Yazawa International Symposium: Metallurgical and Materials Processing: Principles and Techologies; Materials Processing Fundamentals and New Technologies
1

Other

OtherYazawa International Symposium: Metallurgical and Materials Processing: Principles and Technologies; Materials Processing Fundamentals and New Technologies
国/地域United States
CitySan Diego, CA
Period03/3/203/3/6

ASJC Scopus subject areas

  • 工学(全般)

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