(Keynote) Separation of Dy and Nd (La) Using Molten Salt and an Alloy Diaphragm

Konishi, Hisatoshi; Ono, Hideki; Oishi, Tadashi

doi:10.1149/05011.0463ecst

Cited by 28 publications

(42 citation statements)

References 22 publications

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“…Here, the reported separation factor in the LiCl-KCl melt is also plotted after the recalculation from weight to atomic ratio. [18][19][20] As observed in the plots, there is a proportional relationship, of Dy. Table and Figure Captions Table 1 Formation reactions and corresponding potentials for RE-Ni alloys and RE metals in molten NaCl-KCl-0.50 mol%RECl 3 at 973 K (RE = Pr, Nd, and Dy).…”

Section: The Difference Of the Separation Factors Between Nacl-kcl-ndsupporting

confidence: 59%

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Selective Formation of Rare Earth-Nickel Alloys via Electrochemical Reactions in NaCl-KCl Molten Salt

et al. 2014

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Toward the establishment of the electrochemical recovery process of rare-earth (RE) elements from used magnet scraps, selective electrochemical formation of RE-Ni alloys (RE = Pr, Nd, and Dy) was investigated in molten NaCl-KCl-NdCl 3-DyCl 3 and NaCl-KCl-PrCl 3-NdCl 3-DyCl 3 at 973 K. Alloy samples were prepared by potentiostatic electrolysis using Ni plate electrodes at various potentials. The compositions of the formed alloys were analyzed using energy-dispersive X-ray spectroscopy (EDX), and the separation factors defined as {x Dy /(x Pr + x Nd)} alloy were compared. High separation factors of 9.9 and 22.9 were obtained at 0.42 V and 0.45 V (vs. Na + /Na), respectively, indicating the possibility of effective separation and recovery of REs from the used magnet scraps. The optimum electrolysis condition was studied based on the discussion on the formation mechanism of RE-Ni alloys.

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Section: The Difference Of the Separation Factors Between Nacl-kcl-ndsupporting

confidence: 59%

“…25 A linear growth rate was also reported for NdNi 2 in molten LiCl-KCl-0.50 mol%NdCl 3 . 18 The reaction kinetics was one order of magnitude faster in molten NaCl-KCl at higher temperature.…”

Section: Formation Potentials Of Re-ni Alloysmentioning

confidence: 95%

Selective Formation of Rare Earth-Nickel Alloys via Electrochemical Reactions in NaCl-KCl Molten Salt

et al. 2014

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Section: Mechanism For Formation Of Re-ni Alloysmentioning

confidence: 64%

Selective Formation of Rare-Earth–Nickel Alloys via Electrochemical Reactions in NaCl–KCl Molten Salt

Yasuda

Kondo

Kobayashi

et al. 2016

J. Electrochem. Soc.

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Toward the establishment of the electrochemical recovery process of rare-earth (RE) elements from used magnet scraps, selective electrochemical formation of RE-Ni alloys (RE = Pr, Nd, and Dy) was investigated in molten NaCl-KCl-NdCl 3 -DyCl 3 and NaCl-KCl-PrCl 3 -NdCl 3 -DyCl 3 at 973 K. Alloy samples were prepared by potentiostatic electrolysis using Ni plate electrodes at various potentials. The compositions of the formed alloys were analyzed using energy-dispersive X-ray spectroscopy (EDX), and the separation factors defined as {x Dy /(x Pr + x Nd )} alloy were compared. High separation factors of 9.9 and 22.9 were obtained at 0.42 V and 0.45 V (vs. Na + /Na), respectively, indicating the possibility of effective separation and recovery of REs from the used magnet scraps.The optimum electrolysis condition was studied based on the discussion on the formation mechanism of RE-Ni alloys.

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“…Thus, it is necessary to develop an inexpensive and effective recovery/separation process of Dy from scraps of the Dy-added Nd-Fe-B magnet. From this background, we have been investigating a new recovery process of Dy and Nd from the magnet scraps using molten salt electrolysis and alloy diaphragms (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). The key step in this process is the alloying and de-alloying of rare earth (RE) elements on both sides of the diaphragm in order to effectively separate them in the molten salt.…”

Section: Introductionmentioning

confidence: 99%

240th ECS Meeting (Hirokazu Konishi)

Konishi¹

2021

Preprint

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The electrochemical formation of Dy-Ni alloys was investigated in a molten CsCl-DyCl3 system at 973 K under a dry Ar gas atmosphere. Open-circuit potentiometry was performed with a Ni electrode after depositing Dy metal at 0.13 V(vs. Cs+/Cs) for 60 s. Five potential plateaus were observed at 0.34 V, 0.44 V, 0.54 V, 0.79 V and 0.91 V, which were considered to correspond to the potentials of two-phase coexisting states of different Dy–Ni alloys. Potentiostatic electrolysis was conducted at 0.31 V for 4 h and 0.41 V for 1 h using Ni plate electrodes, and XRD analysis indicated the formation of DyNi and DyNi2, respectively. After the formation of DyNi2 on the Ni plate electrodes, potentiostatic electrolysis were also conducted at 075 V and 0.85 V for 1 h. The formed DyNi2 was transformed to Dy2Ni7 and DyNi5 at 0.75 V, while DyNi5 was formed at 0.85 V.

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(Keynote) Separation of Dy and Nd (La) Using Molten Salt and an Alloy Diaphragm

Cited by 28 publications

References 22 publications

Selective Formation of Rare Earth-Nickel Alloys via Electrochemical Reactions in NaCl-KCl Molten Salt

Selective Formation of Rare Earth-Nickel Alloys via Electrochemical Reactions in NaCl-KCl Molten Salt

Selective Formation of Rare-Earth–Nickel Alloys via Electrochemical Reactions in NaCl–KCl Molten Salt

240th ECS Meeting (Hirokazu Konishi)

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