Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium
During the liquid metal extraction reaction between a Nd-Dy-Fe-B magnet and liquid Mg, Nd rapidly diffuses out of the magnet, whereas Dy is not extracted due to the reaction with the matrix and the formation of Dy<sub>2</sub>Fe<sub>17</sub> phase. In addition, theDy<sub>...
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MDPI AG
2021-08-01
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| author | Sun-Woo Nam Sang-Min Park Mohammad Zarar Rasheed Myung-Suk Song Do-Hyang Kim Taek-Soo Kim |
| author_facet | Sun-Woo Nam Sang-Min Park Mohammad Zarar Rasheed Myung-Suk Song Do-Hyang Kim Taek-Soo Kim |
| author_sort | Sun-Woo Nam |
| collection | DOAJ |
| description | During the liquid metal extraction reaction between a Nd-Dy-Fe-B magnet and liquid Mg, Nd rapidly diffuses out of the magnet, whereas Dy is not extracted due to the reaction with the matrix and the formation of Dy<sub>2</sub>Fe<sub>17</sub> phase. In addition, theDy<sub>2</sub>O<sub>3</sub> phase exists at the grain boundaries. Until now, only the effect of the Dy<sub>2</sub>O<sub>3</sub> phase on the extraction of Dy has been reported. In this study, the effect of the Dy<sub>2</sub>Fe<sub>17</sub> phase on the extraction of Dy from the Nd-Dy-Fe-B magnet was investigated in liquid Mg. The formation of the Dy<sub>2</sub>Fe<sub>17</sub> phase during the reaction between Mg and matrix (RE<sub>2</sub>Fe<sub>14</sub>B) was first examined using a thermodynamical approach and confirmed by microstructural analysis. It was observed that Dy extraction was dominated by Dy<sub>2</sub>Fe<sub>17</sub> phase decomposition from 3 h to 24 h, followed by Dy<sub>2</sub>O<sub>3</sub> phase dominant reaction with Mg. Comparing the activities of the Dy<sub>2</sub>Fe<sub>17</sub> phase and the Dy<sub>2</sub>O<sub>3</sub> phase, the reaction of Dy<sub>2</sub>Fe<sub>17</sub> is dominant, as compared to the Dy<sub>2</sub>O<sub>3</sub> phase. Finally, at 48 h, the high Dy extraction percentage of 93% was achieved. As a result, in was concluded that the Dy<sub>2</sub>Fe<sub>17</sub> phase acts as an obstacle in the extraction of Dy. In the future, if research to control the Dy<sub>2</sub>Fe<sub>17</sub> phase proceeds, it will be of great importance to advance the recycling of Dy. |
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| language | English |
| last_indexed | 2024-03-10T07:26:51Z |
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| spelling | doaj.art-42655204a4c245fba6f20c0e6acf67732023-11-22T14:12:30ZengMDPI AGMetals2075-47012021-08-01119134510.3390/met11091345Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid MagnesiumSun-Woo Nam0Sang-Min Park1Mohammad Zarar Rasheed2Myung-Suk Song3Do-Hyang Kim4Taek-Soo Kim5Research Institute of Advanced Manufacturing Technology, Korea Institute of Industrial Technology, 12, Gaetbeol-ro, Incheon 21999, KoreaResearch Institute of Advanced Manufacturing Technology, Korea Institute of Industrial Technology, 12, Gaetbeol-ro, Incheon 21999, KoreaResearch Institute of Advanced Manufacturing Technology, Korea Institute of Industrial Technology, 12, Gaetbeol-ro, Incheon 21999, KoreaResearch Institute of Advanced Manufacturing Technology, Korea Institute of Industrial Technology, 12, Gaetbeol-ro, Incheon 21999, KoreaDepartment of Materials Science and Engineering, Yonsei University, Seoul 03722, KoreaResearch Institute of Advanced Manufacturing Technology, Korea Institute of Industrial Technology, 12, Gaetbeol-ro, Incheon 21999, KoreaDuring the liquid metal extraction reaction between a Nd-Dy-Fe-B magnet and liquid Mg, Nd rapidly diffuses out of the magnet, whereas Dy is not extracted due to the reaction with the matrix and the formation of Dy<sub>2</sub>Fe<sub>17</sub> phase. In addition, theDy<sub>2</sub>O<sub>3</sub> phase exists at the grain boundaries. Until now, only the effect of the Dy<sub>2</sub>O<sub>3</sub> phase on the extraction of Dy has been reported. In this study, the effect of the Dy<sub>2</sub>Fe<sub>17</sub> phase on the extraction of Dy from the Nd-Dy-Fe-B magnet was investigated in liquid Mg. The formation of the Dy<sub>2</sub>Fe<sub>17</sub> phase during the reaction between Mg and matrix (RE<sub>2</sub>Fe<sub>14</sub>B) was first examined using a thermodynamical approach and confirmed by microstructural analysis. It was observed that Dy extraction was dominated by Dy<sub>2</sub>Fe<sub>17</sub> phase decomposition from 3 h to 24 h, followed by Dy<sub>2</sub>O<sub>3</sub> phase dominant reaction with Mg. Comparing the activities of the Dy<sub>2</sub>Fe<sub>17</sub> phase and the Dy<sub>2</sub>O<sub>3</sub> phase, the reaction of Dy<sub>2</sub>Fe<sub>17</sub> is dominant, as compared to the Dy<sub>2</sub>O<sub>3</sub> phase. Finally, at 48 h, the high Dy extraction percentage of 93% was achieved. As a result, in was concluded that the Dy<sub>2</sub>Fe<sub>17</sub> phase acts as an obstacle in the extraction of Dy. In the future, if research to control the Dy<sub>2</sub>Fe<sub>17</sub> phase proceeds, it will be of great importance to advance the recycling of Dy.https://www.mdpi.com/2075-4701/11/9/1345recyclingpyrometallurgydysprosiumliquid metal extractionphase transformation |
| spellingShingle | Sun-Woo Nam Sang-Min Park Mohammad Zarar Rasheed Myung-Suk Song Do-Hyang Kim Taek-Soo Kim Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium Metals recycling pyrometallurgy dysprosium liquid metal extraction phase transformation |
| title | Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium |
| title_full | Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium |
| title_fullStr | Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium |
| title_full_unstemmed | Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium |
| title_short | Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium |
| title_sort | influence of dysprosium compounds on the extraction behavior of dy from nd dy fe b magnet using liquid magnesium |
| topic | recycling pyrometallurgy dysprosium liquid metal extraction phase transformation |
| url | https://www.mdpi.com/2075-4701/11/9/1345 |
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