2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 11: Recycling & Environmental
| Editors: | Kongoli F, Havlik T, Pagnanelli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 410 pages |
| ISBN: | 978-1-987820-34-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Hydrometallurgical Treatment of Used Nd-Fe-B Magnets
Marek Palencar1; Andrea Miskufova2; Anna Kochmanova3; Hedviga Horvathova4;1DEPARTMENT OF NON-FERROUS METALS AND WASTE TREATMENT, Kosice, Slovakia (Slovak Republic); 2TECHNICAL UNIVERSITY, FACULTY OF METALLURGY, DEPT. OF NON-FERROUS METALS AND WASTE TREATMENT, Kosice, Slovakia (Slovak Republic); 3, Kosice, Slovakia (Slovak Republic); 4TECHNICAL UNIVERSITY OF KOSICE, Kosice, Slovakia (Slovak Republic);
Type of Paper: Regular
Id Paper: 88
Topic: 7
Abstract:
Rare earth elements (REE) have been identified as one from 20 critical raw materials for European Union. One of the rare earth elements is also neodymium, which is primarily used for Nd-Fe-B magnets production. These magnets are irreplaceable commodity for reliable working of hard discs in personal computers. Deficiency of neodymium in primary raw materials caused high interests of many companies to deal with possibilities of Nd recycling from spent Nd-Fe-B waste magnets. This study is focused on treating Nd-Fe-B magnets obtained from spent personal computers hard discs. Demagnetization of magnets was realized by thermal treatment (at Curie temperature of 340 °C). In further treatment steps, magnets were crushed and milled, followed by leaching in diluted acid solutions of H2SO4 and HCl, in order to compare the leach ability of neodymium and iron from magnets. In 2M H2SO4 at 20 °C, without stirring the extraction of 99.96 % after 10 minutes of leaching was achieved. In 0.1 M HCl at 80 °C, with stirring (250 rpm) the extraction of 89.96 % at 2 minutes of leaching was achieved.
Keywords:
Acid; Hydrometallurgical; Leaching; Recycling; Wastes;References:
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