2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 5: Starkey Intl. Symp. / Mineral Processing
| Editors: | Kongoli F, Kumar P, Senchenko A, Klein B, Silva A.C., Sun C, Mingan W |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 270 pages |
| ISBN: | 978-1-987820-44-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Recovery Samarium Oxide from SmCo-Containing Slurry by Hydrometallurgy
Kuan-yu Shih1; Wei-Sheng Chen2;1NATIONAL CHENG KUNG UNIVERSITY, Tainan, Taiwan ("Chinese Taipei" for IOC); 2RESOURCES RECYCLING AND MANAGEMENT RESEARCH CENTER, NATIONAL CHENG KUNG UNIVERSITY, Tainan City, Taiwan ("Chinese Taipei" for IOC);
Type of Paper: Regular
Id Paper: 285
Topic: 5
Abstract:
During manufacture of permanent magnets (Sm2Co7 magnets), around 20-40 percent of the slurry would be generated from the machining process. It is estimated that 20 tons of SmCo-containing slurry are produced annually. The SmCo-containing slurry contains 26.04% of samarium, 55.88% of cobalt and 12.12% of iron 4.39% of copper and 1.57% zirconium. Due to slightly oxidizing during the machining process, hydrometallurgy was chosen as a recovery method. The innovative recovery method includes drying, leaching, precipitation, purification and calcination. 6M nitrate acid was used as a leaching agent, leaching rate of all five elements were over 99%. Followed by oxidation and pH adjustment, iron(III) and cobalt(III) precipitate as iron hydroxide and cobalt hydroxide. After filtration, cupferron was further used to purify the leachate. Cupferron would precipitate with copper and zirconium as complex. After removing the cupferron-complex, oxalate acid was added to form samarium oxalate. Furthermore, calcination of samarium oxalate, samarium oxide was received. The recovery rate of samarium oxide is up to 95%, and the purity of samarium oxide is 99.5%.