Separation of rare earth elements by synergistic solvent extraction with phosphonium-based ionic liquids using a β-diketone extractant and a neutral ligand
We investigated the solvent extraction of four rare earth (RE) elements (Pr, Nd, Tb, and Dy) from Nd-Fe-B magnets using mixtures of 1-(2-thienyl)-4,4,4,-trifluoro-1,3-butanedione (Htta) or 4,4,4-trifluoro-1-phenyl-1,3-butanedione (Hbfa) chelating extractants and tri-n-octylphosphine oxide (TOPO) neu...
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Published in | Solvent extraction and ion exchange Vol. 39; no. 7; pp. 764 - 784 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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Taylor & Francis
10.11.2021
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Abstract | We investigated the solvent extraction of four rare earth (RE) elements (Pr, Nd, Tb, and Dy) from Nd-Fe-B magnets using mixtures of 1-(2-thienyl)-4,4,4,-trifluoro-1,3-butanedione (Htta) or 4,4,4-trifluoro-1-phenyl-1,3-butanedione (Hbfa) chelating extractants and tri-n-octylphosphine oxide (TOPO) neutral ligand in phosphonium-based ionic liquids. Based on the results of slope analysis data, the following equations were proposed for the RE extraction:
A synergistic effect was observed for the extraction of the RE elements with the combination of extractant and neutral ligand. The values of the equilibrium constant and separation factor were also evaluated in this study. The results reveal that the [NTf
2
]
−
anion did not participate in the extraction mechanism of the RE elements, and the Raman spectroscopic analysis of the extracted phase also supported the proposed stoichiometry of the extracted complex. Furthermore, the separation of Tb(III) and Dy(III) from other RE(III) components was investigated through a series of hydrometallurgical processes, which consisted of leaching, removal of [Fe(OH)
x
]
3-x
, and solvent extraction. Finally, the separation of Tb(III) and Dy(III) from other RE(III) components was performed with seven extraction cycles using the HL + TOPO/[P
2225
][NTf
2
] system. |
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AbstractList | We investigated the solvent extraction of four rare earth (RE) elements (Pr, Nd, Tb, and Dy) from Nd-Fe-B magnets using mixtures of 1-(2-thienyl)-4,4,4,-trifluoro-1,3-butanedione (Htta) or 4,4,4-trifluoro-1-phenyl-1,3-butanedione (Hbfa) chelating extractants and tri-n-octylphosphine oxide (TOPO) neutral ligand in phosphonium-based ionic liquids. Based on the results of slope analysis data, the following equations were proposed for the RE extraction:
A synergistic effect was observed for the extraction of the RE elements with the combination of extractant and neutral ligand. The values of the equilibrium constant and separation factor were also evaluated in this study. The results reveal that the [NTf
2
]
−
anion did not participate in the extraction mechanism of the RE elements, and the Raman spectroscopic analysis of the extracted phase also supported the proposed stoichiometry of the extracted complex. Furthermore, the separation of Tb(III) and Dy(III) from other RE(III) components was investigated through a series of hydrometallurgical processes, which consisted of leaching, removal of [Fe(OH)
x
]
3-x
, and solvent extraction. Finally, the separation of Tb(III) and Dy(III) from other RE(III) components was performed with seven extraction cycles using the HL + TOPO/[P
2225
][NTf
2
] system. |
Author | Matsumiya, Masahiko Tsuchida, Yusuke Sasaki, Yuji Nomizu, Daiki |
Author_xml | – sequence: 1 givenname: Masahiko orcidid: 0000-0002-4719-9307 surname: Matsumiya fullname: Matsumiya, Masahiko email: matsumiya-masahiko-dh@ynu.ac.jp organization: Yokohama National University – sequence: 2 givenname: Daiki surname: Nomizu fullname: Nomizu, Daiki organization: Yokohama National University – sequence: 3 givenname: Yusuke surname: Tsuchida fullname: Tsuchida, Yusuke organization: Yokohama National University – sequence: 4 givenname: Yuji surname: Sasaki fullname: Sasaki, Yuji organization: Japan Atomic Energy Agency |
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CitedBy_id | crossref_primary_10_1016_j_jhazmat_2024_134633 crossref_primary_10_1134_S0022476622100092 crossref_primary_10_3390_pr12030570 crossref_primary_10_3390_pr9071202 |
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Title | Separation of rare earth elements by synergistic solvent extraction with phosphonium-based ionic liquids using a β-diketone extractant and a neutral ligand |
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