Purification of rare earth bis(trifluoromethyl-sulfonyl)amide salts by hydrometallurgy and electrodeposition of neodymium metal using potassium bis(trifluoromethyl-sulfonyl)amide melts
•The hydrometallurgical process based on leaching, deironization and purification of rare earth amide salts was performed at bench scale.•The electrodeposition of Nd metal in KTFSA melts was performed under potentiostatic condition.•We demonstrated the effectiveness of the novel recovery process by...
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Published in | Separation and purification technology Vol. 170; pp. 417 - 426 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
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Elsevier B.V
01.10.2016
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Abstract | •The hydrometallurgical process based on leaching, deironization and purification of rare earth amide salts was performed at bench scale.•The electrodeposition of Nd metal in KTFSA melts was performed under potentiostatic condition.•We demonstrated the effectiveness of the novel recovery process by estimating whole material flow.
This paper reports a novel bench-scale hydrometallurgical procedure and electrodeposition using potassium bis(trifluoromethyl-sulfonyl)amide (KTFSA) melts for the recovery of rare earth (RE) elements from Nd-Fe-B magnet waste. The investigations were performed at bench scale to assess the potential of a process based on leaching, deironization, and purification of RE amide salts. In the leaching process using 3.4kg of oxidized Nd-Fe-B and 14.2L of an aqueous solution of 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide (HTFSA), 83.0% Nd and 0.98% Fe were leached in 13h, indicating that selective leaching of RE elements was performed at bench scale. Then, KOH or oxidized Nd-Fe-B was used as a precipitation agent in the deironization process and 100.0% Fe was successfully separated from RE components. Moreover, 4.07kg of purified amide salts (M(TFSA)3, M=Pr, Nd, Dy, B, Al, and trace elements) were recovered from a spray dryer.
The electrochemical behavior of Nd(III) in KTFSA melts containing M(TFSA)3 (molar fraction of RE components: xRE=0.1) was investigated in this study. Electrochemical analysis revealed that the reduction peak of Nd(III) at around +1.0V vs. K/K+ was due to the following reaction: Nd(III)+3e−→Nd(0). The diffusion coefficient of Nd(III) was estimated to be 3.14×10−10m2s−1 at 483K by semi-differential analysis, which is similar to that of Nd(III) in KTFSA melts containing pure Nd(TFSA)3 salts (xNd=0.1). The electrodeposition of Nd was performed under potentiostatic conditions of +0.8V vs. K/K+ at 483K. The electrodeposits had a fine surface morphology with small metal particles. The electrodeposits were confirmed to be Nd metal in the middle layer analyzed by scanning electron microscopy/energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. Finally, we demonstrated the effectiveness of the novel recovery process for practical use by estimating whole material flow. |
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AbstractList | This paper reports a novel bench-scale hydrometallurgical procedure and electrodeposition using potassium bis(trifluoromethyl-sulfonyl)amide (KTFSA) melts for the recovery of rare earth (RE) elements from Nd-Fe-B magnet waste. The investigations were performed at bench scale to assess the potential of a process based on leaching, deironization, and purification of RE amide salts. In the leaching process using 3.4kg of oxidized Nd-Fe-B and 14.2L of an aqueous solution of 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide (HTFSA), 83.0% Nd and 0.98% Fe were leached in 13h, indicating that selective leaching of RE elements was performed at bench scale. Then, KOH or oxidized Nd-Fe-B was used as a precipitation agent in the deironization process and 100.0% Fe was successfully separated from RE components. Moreover, 4.07kg of purified amide salts (M(TFSA)3, M=Pr, Nd, Dy, B, Al, and trace elements) were recovered from a spray dryer. The electrochemical behavior of Nd(III) in KTFSA melts containing M(TFSA)3 (molar fraction of RE components: x RE =0.1) was investigated in this study. Electrochemical analysis revealed that the reduction peak of Nd(III) at around +1.0V vs. K/K+ was due to the following reaction: Nd(III)+3e- arrow right Nd(0). The diffusion coefficient of Nd(III) was estimated to be 3.1410-10 m2 s-1 at 483K by semi-differential analysis, which is similar to that of Nd(III) in KTFSA melts containing pure Nd(TFSA)3 salts (x Nd =0.1). The electrodeposition of Nd was performed under potentiostatic conditions of +0.8V vs. K/K+ at 483K. The electrodeposits had a fine surface morphology with small metal particles. The electrodeposits were confirmed to be Nd metal in the middle layer analyzed by scanning electron microscopy/energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. Finally, we demonstrated the effectiveness of the novel recovery process for practical use by estimating whole material flow. •The hydrometallurgical process based on leaching, deironization and purification of rare earth amide salts was performed at bench scale.•The electrodeposition of Nd metal in KTFSA melts was performed under potentiostatic condition.•We demonstrated the effectiveness of the novel recovery process by estimating whole material flow. This paper reports a novel bench-scale hydrometallurgical procedure and electrodeposition using potassium bis(trifluoromethyl-sulfonyl)amide (KTFSA) melts for the recovery of rare earth (RE) elements from Nd-Fe-B magnet waste. The investigations were performed at bench scale to assess the potential of a process based on leaching, deironization, and purification of RE amide salts. In the leaching process using 3.4kg of oxidized Nd-Fe-B and 14.2L of an aqueous solution of 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide (HTFSA), 83.0% Nd and 0.98% Fe were leached in 13h, indicating that selective leaching of RE elements was performed at bench scale. Then, KOH or oxidized Nd-Fe-B was used as a precipitation agent in the deironization process and 100.0% Fe was successfully separated from RE components. Moreover, 4.07kg of purified amide salts (M(TFSA)3, M=Pr, Nd, Dy, B, Al, and trace elements) were recovered from a spray dryer. The electrochemical behavior of Nd(III) in KTFSA melts containing M(TFSA)3 (molar fraction of RE components: xRE=0.1) was investigated in this study. Electrochemical analysis revealed that the reduction peak of Nd(III) at around +1.0V vs. K/K+ was due to the following reaction: Nd(III)+3e−→Nd(0). The diffusion coefficient of Nd(III) was estimated to be 3.14×10−10m2s−1 at 483K by semi-differential analysis, which is similar to that of Nd(III) in KTFSA melts containing pure Nd(TFSA)3 salts (xNd=0.1). The electrodeposition of Nd was performed under potentiostatic conditions of +0.8V vs. K/K+ at 483K. The electrodeposits had a fine surface morphology with small metal particles. The electrodeposits were confirmed to be Nd metal in the middle layer analyzed by scanning electron microscopy/energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. Finally, we demonstrated the effectiveness of the novel recovery process for practical use by estimating whole material flow. |
Author | Matsumiya, Masahiko Fujita, Tetsuo Ota, Hisashi Yamada, Takahiro Kawakami, Satoshi |
Author_xml | – sequence: 1 givenname: Hisashi surname: Ota fullname: Ota, Hisashi organization: Graduate School of Environment and Information Sciences, Yokohama National University, 79-2 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan – sequence: 2 givenname: Masahiko surname: Matsumiya fullname: Matsumiya, Masahiko email: mmatsumi@ynu.ac.jp organization: Graduate School of Environment and Information Sciences, Yokohama National University, 79-2 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan – sequence: 3 givenname: Takahiro surname: Yamada fullname: Yamada, Takahiro organization: Graduate School of Environment and Information Sciences, Yokohama National University, 79-2 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan – sequence: 4 givenname: Tetsuo surname: Fujita fullname: Fujita, Tetsuo organization: Environmental Protection Laboratory, DOWA ECO-SYSTEM Co., Ltd., 65-1 Omoriyama-shita, Hanaoka, Odate, Akita 017-0005, Japan – sequence: 5 givenname: Satoshi surname: Kawakami fullname: Kawakami, Satoshi organization: Environmental Protection Laboratory, DOWA ECO-SYSTEM Co., Ltd., 65-1 Omoriyama-shita, Hanaoka, Odate, Akita 017-0005, Japan |
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Keywords | Bis(trifluoromethyl-sulfonyl)amide melts Electrodeposition Neodymium metals Hydrometallurgy |
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Snippet | •The hydrometallurgical process based on leaching, deironization and purification of rare earth amide salts was performed at bench scale.•The electrodeposition... This paper reports a novel bench-scale hydrometallurgical procedure and electrodeposition using potassium bis(trifluoromethyl-sulfonyl)amide (KTFSA) melts for... |
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SubjectTerms | Bis(trifluoromethyl-sulfonyl)amide melts Electrodeposition Ferrous alloys Hydrometallurgy Leaching Magnetic materials Melts Neodymium Neodymium metals Purification Rare earth metals |
Title | Purification of rare earth bis(trifluoromethyl-sulfonyl)amide salts by hydrometallurgy and electrodeposition of neodymium metal using potassium bis(trifluoromethyl-sulfonyl)amide melts |
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