The Effect of Grinding and Roasting Conditions on the Selective Leaching of Nd and Dy from NdFeB Magnet Scraps
The pretreatment processes consisting of grinding followed by roasting were investigated to improve the selective leaching of Nd and Dy from neodymium-iron-boron (NdFeB) magnet scraps. The peaks of Nd(OH)3 and Fe were observed in XRD results after grinding with NaOH as the amount of water addition i...
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MDPI AG
2015-07-01
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| Series: | Metals |
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| Online Access: | http://www.mdpi.com/2075-4701/5/3/1306 |
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| author | Ho-Sung Yoon Chul-Joo Kim Kyung Woo Chung Sanghee Jeon Ilhwan Park Kyoungkeun Yoo Manis Kumar Jha |
| author_facet | Ho-Sung Yoon Chul-Joo Kim Kyung Woo Chung Sanghee Jeon Ilhwan Park Kyoungkeun Yoo Manis Kumar Jha |
| author_sort | Ho-Sung Yoon |
| collection | DOAJ |
| description | The pretreatment processes consisting of grinding followed by roasting were investigated to improve the selective leaching of Nd and Dy from neodymium-iron-boron (NdFeB) magnet scraps. The peaks of Nd(OH)3 and Fe were observed in XRD results after grinding with NaOH as the amount of water addition increased to 5 cm3. These results indicate that the components of Nd and Fe in NdFeB magnet could be changed successfully into Nd(OH)3 and Fe, respectively. In the roasting tests using the ground product, with increasing roasting temperature to 500 °C, the peaks of Nd(OH)3 and Fe disappeared while those of Nd2O3 and Fe2O3 were shown. The peaks of NdFeO3 in the sample roasted at 600 °C were observed in the XRD pattern. Consequently, 94.2%, 93.1%, 1.0% of Nd, Dy, Fe were leached at 400 rpm and 90 °C in 1 kmol·m−3 acetic acid solution with 1% pulp density using a sample prepared under the following conditions: 15 in stoichiometric molar ratio of NaOH:Nd, 550 rpm in rotational grinding speed, 5 cm3 in water addition, 30 min in grinding time, 400 °C and 2 h in roasting temperature and time. The results indicate that the selective leaching of Nd and Dy from NdFeB magnet could be achieved successfully by grinding and then roasting treatments. |
| first_indexed | 2024-12-23T05:49:10Z |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-23T05:49:10Z |
| publishDate | 2015-07-01 |
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| record_format | Article |
| series | Metals |
| spelling | doaj.art-45be38dcea3f4d7d983e3cae178574842022-12-21T17:58:00ZengMDPI AGMetals2075-47012015-07-01531306131410.3390/met5031306met5031306The Effect of Grinding and Roasting Conditions on the Selective Leaching of Nd and Dy from NdFeB Magnet ScrapsHo-Sung Yoon0Chul-Joo Kim1Kyung Woo Chung2Sanghee Jeon3Ilhwan Park4Kyoungkeun Yoo5Manis Kumar Jha6Minerals Resource Research Division, Korea Institute of Geoscienece & Mineral Resources (KIGAM), Daejeon 305-350, KoreaMinerals Resource Research Division, Korea Institute of Geoscienece & Mineral Resources (KIGAM), Daejeon 305-350, KoreaMinerals Resource Research Division, Korea Institute of Geoscienece & Mineral Resources (KIGAM), Daejeon 305-350, KoreaDepartment of Energy & Resources Engineering, Korea Maritime and Ocean University (KMOU), Busan 606-791, KoreaDepartment of Energy & Resources Engineering, Korea Maritime and Ocean University (KMOU), Busan 606-791, KoreaDepartment of Energy & Resources Engineering, Korea Maritime and Ocean University (KMOU), Busan 606-791, KoreaMetal Extraction & Forming Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, IndiaThe pretreatment processes consisting of grinding followed by roasting were investigated to improve the selective leaching of Nd and Dy from neodymium-iron-boron (NdFeB) magnet scraps. The peaks of Nd(OH)3 and Fe were observed in XRD results after grinding with NaOH as the amount of water addition increased to 5 cm3. These results indicate that the components of Nd and Fe in NdFeB magnet could be changed successfully into Nd(OH)3 and Fe, respectively. In the roasting tests using the ground product, with increasing roasting temperature to 500 °C, the peaks of Nd(OH)3 and Fe disappeared while those of Nd2O3 and Fe2O3 were shown. The peaks of NdFeO3 in the sample roasted at 600 °C were observed in the XRD pattern. Consequently, 94.2%, 93.1%, 1.0% of Nd, Dy, Fe were leached at 400 rpm and 90 °C in 1 kmol·m−3 acetic acid solution with 1% pulp density using a sample prepared under the following conditions: 15 in stoichiometric molar ratio of NaOH:Nd, 550 rpm in rotational grinding speed, 5 cm3 in water addition, 30 min in grinding time, 400 °C and 2 h in roasting temperature and time. The results indicate that the selective leaching of Nd and Dy from NdFeB magnet could be achieved successfully by grinding and then roasting treatments.http://www.mdpi.com/2075-4701/5/3/1306NdFeB magnet scrapsselective leachingacetic acid leachingroastingplanetary ball milling |
| spellingShingle | Ho-Sung Yoon Chul-Joo Kim Kyung Woo Chung Sanghee Jeon Ilhwan Park Kyoungkeun Yoo Manis Kumar Jha The Effect of Grinding and Roasting Conditions on the Selective Leaching of Nd and Dy from NdFeB Magnet Scraps Metals NdFeB magnet scraps selective leaching acetic acid leaching roasting planetary ball milling |
| title | The Effect of Grinding and Roasting Conditions on the Selective Leaching of Nd and Dy from NdFeB Magnet Scraps |
| title_full | The Effect of Grinding and Roasting Conditions on the Selective Leaching of Nd and Dy from NdFeB Magnet Scraps |
| title_fullStr | The Effect of Grinding and Roasting Conditions on the Selective Leaching of Nd and Dy from NdFeB Magnet Scraps |
| title_full_unstemmed | The Effect of Grinding and Roasting Conditions on the Selective Leaching of Nd and Dy from NdFeB Magnet Scraps |
| title_short | The Effect of Grinding and Roasting Conditions on the Selective Leaching of Nd and Dy from NdFeB Magnet Scraps |
| title_sort | effect of grinding and roasting conditions on the selective leaching of nd and dy from ndfeb magnet scraps |
| topic | NdFeB magnet scraps selective leaching acetic acid leaching roasting planetary ball milling |
| url | http://www.mdpi.com/2075-4701/5/3/1306 |
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