2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 7. Recycling, Secondary Batteries and Environmental Protection
| Editors: | Kongoli F, Aifantis K, Kumar V, Pagnanelli F, Kozlov P, Xueyi G |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 205 pages |
| ISBN: | 978-1-987820-73-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Diffusion Behavior of Rare Earth Elements Contained in Permanent Magnet with Molten Bismuth by Pyrometallurgical Process
Sunwoo Nam1; Sardar Farhat Abbas1; Young-Soo Kim1; Dae-Kyeom Kim1; Do Hyang Kim2; Taek-Soo Kim1;1KITECH, Incheon, Korea (Republic of [South] Korea); 2YONSEI UNIVERSITY,, Seoul, Korea (Republic of [South] Korea);
Type of Paper: Regular
Id Paper: 62
Topic: 7
Abstract:
Recently, the extraction behavior of rare earth elements(REEs) contained in permanent magnets has been studied by hydrometallurgical using chemical solutions and pyrometallurgical process using molten magnesium.
In order to explore new and better extractant in pyrometallurgical process, the authors used molten bismuth.
To investigate the characteristics of diffusion in REEs(Nd, Dy)-Bi couple, an assessment of both reaction and diffusion of Nd and Dy in molten bismuth was carried out. For identification of the reaction mechanism, the effects of experimental parameters such as temperature (range of 573K to 973K) and holding time (from 0 to 24hour) were investigated. Diffusion of REE from the Nd-Fe-B magnet into molten Bi was found to occur at a higher rate than molten Mg, and the reaction rate was varied depending on the temperature and time. The diffusion behaviors were analyzed by Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS), and the constituent phases were characterized using X-Ray Diffraction (XRD). It was found out that 500ĦE is the critical temperature for extraction and diffusion of REE(Nd, Dy) by Bi.