2016 Fiscal Year Final Research Report
Development of novel extraction-electrodeposition process using ionic liquids for the purpose of efficient recovery of rare earths
| Project/Area Number |
26550075
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental conscious materials and recycle
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| Research Institution | Yokohama National University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 有価物回収 / イオン液体 / 溶媒抽出 / 電解析出 |
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| Outline of Final Research Achievements |
In this study, we developed a novel extraction-electrodeposition process using ionic liquids for the purpose of efficient recovery of rare earths. At first, the extraction behaviors of rare earths (Nd, Dy) were analyzed by slope analysis. In addition, the solvation structures of the extracted rare earth complexes were investigated from Raman spectroscopy. As a result, the extracted species were [RE(TBP)3(TFSA)3], (RE=Nd, Dy). Furthermore, a series of extraction-electrodeposition process was performed for the actual Nd-Fe-B spent magnets. Nd and Dy were efficiently extracted from TBP/[P2225][TFSA] media and each metal was obtained by the potetiostatic electrodeposition using ionic liquids including [RE(TBP)3(TFSA)3] species. Then, the cathodic current efficiency was increased with increasing the extracted rare earth complexes. This result allowed us to conclude that the extraction-electrodeposition process will be hopeful to apply for the Nd-Fe-B spent magnets for near future.
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| Free Research Field |
応用電気化学
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