Phase equilibrium of the system Ag-Fe-Nd, and Nd extraction from magnet scraps using molten silver

O. Takeda, T. H. Okabe, Y. Umetsu

研究成果: Article査読

44 被引用数 (Scopus)

抄録

To develop a new recycling process, we examined the direct extraction of neodymium (Nd) metal from Nd-Fe-B magnet scraps using molten silver (Ag) as an extraction medium. Prior to the extraction experiment, the phase equilibrium of the system Ag-Fe-Nd was investigated to estimate the theoretical extraction limit. It was observed that the Fe/Nd2Fe17 mixture equilibrates with the molten Ag-Nd alloy containing 50-52mol% Nd (57-59mass% Nd) at 1363K. The experimental results were in good agreement with the thermodynamic calculation based on literature values. By reacting Nd-Fe-B magnet scraps with molten silver at 1273K, more than 90% of the neodymium in the scrap was extracted, and an Ag-Nd alloy containing 40-50mass% Nd was obtained. The neodymium in the Ag-Nd alloy was separated from silver as Nd2O 3 by oxidizing the obtained alloy in air. Although the wettability of Nd2O3 with molten silver caused some difficulties in the separation of neodymium from silver, molten silver is shown to be an effective medium for neodymium extraction from magnet scrap.

本文言語English
ページ(範囲)305-313
ページ数9
ジャーナルJournal of Alloys and Compounds
379
1-2
DOI
出版ステータスPublished - 2004 10 6

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

フィンガープリント 「Phase equilibrium of the system Ag-Fe-Nd, and Nd extraction from magnet scraps using molten silver」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル