2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 1. Barrios Intl. Symp. / Non-ferrous Smelting & Hydro/Electrochemical Processing
| Editors: | Kongoli F, Palacios M, Buenger T, Meza JH, Delgado E, Joudrie MC, Gonzales T, Treand N |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 264 pages |
| ISBN: | 978-1-987820-61-4 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Precipitation Properties of Neodymium and Dysprosium Double Salt in Sulfuric Acid Leaching Solution from Permanent Magnet Scrap
Chul Joo Kim1; Ho-Sung Yoon1; Kyeong Woo Chung1;1KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES (KIGAM), Daejeon, Korea (Republic of [South] Korea);
Type of Paper: Regular
Id Paper: 51
Topic: 11
Abstract:
In this study, the precipitation of rare earth-sodium sulfate was conducted in order to separate rare earth from Fe in rare earth sulfate solution. The rare earth sulfate solution could be obtained by sulfuric acid leaching of waste permanent magnet scrap oxidizing-roasted. The method of double salt precipitation was used for the selective recovery of rare earth elements from leach liquor. Rare earth elements could be precipitated as a form of sodium rare earth sulfate with sodium sulfate in sulfuric media. Therefore the effects of sodium sulfate, reaction temperature and reaction time on the recovery of rare earth element were surveyed during double salt precipitation. Neodymium(Nd) was easily precipitated as Nd-sulfate salt with sodium sulfate, on the other hand, excessive sodium sulfate was needed for the precipitation of Dy-sulfate salt. Also neodymium not only promoted the precipitation of dysprosium sulfate salt but also increased recovery of dysprosium sulfate salt in sulfuric acid solution. At the condition of 60ĦE precipitation temperature, 3h reaction time, 7 equivalents sodium sulfate, the recovery of neodymium and dysprosium sulfate salt was 99.7% and 94.3% respectively from the sulfuric acid solution containing Nd of 23.39mg/ml and Dy of 8.67mg/ml.