2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 6: Rare Earths & Ionic Liquids
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 432 pages |
| ISBN: | 978-1-987820-08-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Electrochemical Separation of Dy from Nd Magnet Scrap in a Molten LiCl-KCl
Hirokazu Konishi1; Hideki Ono1; Toshiyuki Nohira2; Tetsuo Oishi3;1OSAKA UNIVERSITY, Suita, Japan; 2KYOTO UNIVERSITY, Kyoto, Japan; 3NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Tsukuba, Japan;
Type of Paper: Regular
Id Paper: 59
Topic: 11
Abstract:
We proposed a new separation and recovery process for RE metals from Nd magnet scraps using molten salt electrolysis. The present study focused on the electrochemical formation of RE-Ni (RE=Dy, Nd) alloys in a molten LiCl-KCl system at 723 K. Cyclic voltammetry was conducted using a Ni electrode in molten LiCl-KCl-RECl3(RE=Dy, Nd) systems at 723 K. In cathodic scan, a cathodic current was observed from 1.00 V (vs. Li+/Li) due to the formation of Dy-Ni alloys in a molten LiCl-KCl-DyCl3 system. In contrast, a cathodic current was observed from 0.60 V due to the formation of Nd-Ni alloys in a molten LiCl-KCl-NdCl3 system. On the basis of these results, an alloy sample was prepared by potentiostatic electrolysis at 0.65 V for 1 h using a Ni plate cathode in a molten LiCl-KCl-DyCl3-NdCl3 system. The mass ratio of Dy/Nd in the alloy sample was found to be 72 by ICP-AES.