Browse > Article
http://dx.doi.org/10.7844/kirr.2018.27.1.38

Recovery of Rare Earth Elements from Nd Magnet Scrap Using PVC  

Lee, So-Yeong (School of Materials Science and Engineering, Kyungpook National University)
Park, Sung-Hun (School of Materials Science and Engineering, Kyungpook National University)
Son, Injoon (School of Materials Science and Engineering, Kyungpook National University)
Sohn, Ho-Sang (School of Materials Science and Engineering, Kyungpook National University)
Publication Information
Resources Recycling / v.27, no.1, 2018 , pp. 38-44 More about this Journal
Abstract
A large amount of Nd-Fe-B magnet scraps are generated during magnet manufacture process. In this study, selective chlorination of the rare earth elements by hydrogen chloride gas which obtained from the pyrolysis of polyvinyl chloride (PVC) was investigated. In thermogravimetric analysis, drastic weight loss was occurred at about 500 K and 710 K. At the isothermal experiments, the weight loss reaches about 30% above 673 K. XRD patterns characterized that after each experiments, ${\alpha}$-Fe, Nd oxychloride, Nd chloride, and Fe chlorides were formed, and the leaching residues remain only ${\alpha}$-Fe. The yields of Nd, Dy, and Fe for the isothermal experiment were increased with temperature and peaked at 873 K. As PVC ratio increased, the yields of Nd, Dy and Fe were also increased.
Keywords
PVC; Pyrolysis; Chlorination; NdFeB magnet; HCl;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Sagawa, M., Fujimura, S., Yamamoto, H., Matsuura, Y. and Hiraga, K., 1984 : Permanent Magnet Materials based on the Rare Earth-Iron-Boron Tetragonal Compounds (Invited), IEEE Transactions on Magnetics MAG-20(5), pp.1584-1589.   DOI
2 Sagawa, M., 2001 : Development of NdFeB magnet, Materia Jpn. 40(11), pp.943-946.   DOI
3 Yoon, Ho-Sung, et al., 2003 : Separation of Neodymium from NdFeB Permanent Magnetic Scrap, J. of Korean Inst. of Resources Recycling 12(6), pp.57-63.
4 Yoon, Ho-Sung, et al., 2004 : Recovery of Neodymium from NdFeB Oxidation-Roasted Scrap by Acetic Acid Leaching, J. of Korean Inst. of Resources Recycling 12(6), pp.57-63.
5 Lee, GyeSeung and Song, YoungJun, 2003 : Study on the Synchronous Recycling of EAF Dust and Waste PVC, J. Kor. Inst. of Resources Recycling 12(6), pp.47-56.
6 Son, Yongik, Ring, Rie and Sohn, Ho-Sang, 2016 : Removal of Iron from Ilmenite through Selective Chlorination Using PVC, J. Kor. Inst. of Resources Recycling 25(3), pp.74-84.   DOI
7 Banya, Sirou, 2000: Ferrous Process Metallurgy, The Japan Institute of Metals, Maruzen, Tokyo, Japan.