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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.44  No.4 (2003)  >  pp.798-801

MATERIALS TRANSACTIONS
<<Previous article Vol.44  No.4 (2003)   pp.798 - 801 Next article>>

Direct Extraction and Recovery of Neodymium Metal from Magnet Scrap

Toru H. Okabe1), Osamu Takeda2), Kazuhiro Fukuda3) and Yoshiaki Umetsu3)
1) Institute of Industrial Science, The University of Tokyo
2) Santoku Co. Ltd.
3) Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University


An environmentally sound process for the extraction of neodymium (Nd) from magnet scrap was devised and its feasibility was demonstrated. The developed Nd extraction apparatus circulates the magnesium (Mg) as an extraction medium by maintaining a temperature difference within the reaction vessel, thus achieving continuous extraction of metal Nd from scrap, re-extraction of Mg from a Mg–Nd alloy, and finally, pure Nd metal with 97.7% purity was directly recovered from magnet scrap without oxidation. The concept of “scrap combination” for recycling variable materials, that is demonstrated in this study, is an important technology that can be instrumental in creating a highly developed self-sustainable society.


Keyword:
neodymium, magnet scrap, magnesium, extraction, recycling, recovery, rare earth

Received: February 03, 2003
Accepted: February 19, 2003 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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