2017 Fiscal Year Final Research Report
Purification of rare earth salts by hydrometallurgy and development of novel recovery process by electrodeposition using ionic liquid
| Project/Area Number |
15H02848
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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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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| Co-Investigator(Kenkyū-buntansha) |
綱島 克彦 和歌山工業高等専門学校, その他部局等, 教授 (90550070)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 有価物回収 / イオン液体 |
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| Outline of Final Research Achievements |
From a fundamental research, it was revealed that the solvation structure of rare earth complex was [Nd(TFSA)5]2- by Raman spectroscopy. Moreover, it was found that the nucleation process was changed from instantaneous to progressive process by the alternation of overpotential. The reduction process of Nd(III)/Nd(0) was also clarified by EQCM analysis. From an applied research, a series of process consisting of pretreatment, hydrometallurgy and electrodeposition using ionic liquid was demonstrated that the separation factor of Fe was >99.9% and hydrometallurgy with high solid-liquid separability was established by introducing a seed crystal method. Finally, a series of experimental results were contributed to the purification process with high purity, because we can recover the rare earth salts of 4.07 kg and the purity of rare earth was >96.0%. On the electrodeposition process using ionic liquid, we can recover the electrodeposited Nd of 2.505 g by potentiostatic electrodeposition.
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| Free Research Field |
応用電気化学
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