Direct electrochemical reduction of Dy2O3 in CaCl2 melt

Kim, Pyonghun; Xie, Hongwei; Zhai, Yuchun; Zou, Xiangyu; Xiao-chuan, Lang

doi:10.1007/s10800-012-0392-6

Cited by 21 publications

(12 citation statements)

References 17 publications

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“…Dysprosium (Dy), a heavy rare‐earth metal, possesses good magnetic, optical, electrical, and physical properties. [ 31 ] For example, because of its high magnetic moment in Lns, Dy–Zn alloys can be used as raw materials to produce the magnetic materials Mn 0.5 Zn 0.5 Dy x Fe 2 – x O 4 ( x = 0.05, 0.1, 0.15, and 0.2). [ 32 ] In addition, Dy metal exhibits characteristic f–f transitions, and Dy–Zn alloys can be used to prepare the Dy–Zn metal–organic framework, which is a luminescent material.…”

Section: Introductionmentioning

confidence: 99%

Electroreduction of Dy(III) assisted by Zn and its co‐deposition with Zn(II) in LiCl–KCl molten salt

Han

et al. 2020

Applied Organom Chemis

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To recover dysprosium (Dy) from LiCl–KCl molten salt, the electrochemical mechanism of Dy(III) on liquid Zn electrode and co‐deposition of Dy(III) and Zn(II) on W electrode were studied using electrochemical methods. Cyclic voltammetry results demonstrated that the redox process of Dy on liquid Zn electrode is reversible and controlled by diffusion. Reverse chronopotentiograms showed that the transition time ratio of reduction and oxidation is ~3:1, revealing the redox of Dy on liquid Zn electrode is a kind of soluble–soluble system: Dy(III) + 3e− = (Dy–Zn)solution. The half‐wave potential of Dy(III) was almost constant with the increase in scanning rate. The electrochemical separation of metallic Dy from the molten salt was performed using constant potential electrolysis, and the product characterized using X‐ray diffraction and scanning electron microscopy–energy‐dispersive X‐ray spectroscopy was the thermodynamic unstable compound DyZn5. Also, the co‐deposition mechanism of Dy(III) and Zn(II) was explored, indicating that Dy(III) could deposit on pre‐deposited Zn and form Dy–Zn compounds: Zn(II) + 2e− = Zn and xDy(III) + yZn + 3xe− = DyxZny. Moreover, the effect of Dy(III) concentration on the formation of Dy–Zn compounds was investigated. The redox peak currents corresponding to different Dy–Zn compounds changed with the increase in Dy(III) concentration. The co‐deposition of Dy(III) and Zn(II) was performed using constant current electrolysis at diverse Dy(III) concentrations. The different Dy–Zn compounds were produced by controlling Dy(III) concentration.

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Section: Introductionmentioning

confidence: 99%

Electroreduction of Dy(III) assisted by Zn and its co‐deposition with Zn(II) in LiCl–KCl molten salt

Han

et al. 2020

Applied Organom Chemis

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“…After their report, electrochemical reduction of various ionic metal oxides have been studied in molten salts on a laboratory scale (e.g. Ti 8 , Cr 9 , Ce 10 , Nb 11 , Ta 12 , W 13 , Ni 14 , Zr 15 , Dy 16 , U 17 ).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Reduction Behavior of Borosilicate Glass in Molten CaCl₂

Katasho

Yang

Yasuda

2016

J. Electrochem. Soc.

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The electrochemical reduction behavior of borosilicate glass, which is the main component of vitrified radioactive waste, was investigated in molten CaCl2 at 1123 K to establish a new nuclear waste disposal procedure. Cyclic voltammetry of borosilicate and silica glasses suggested that the reduction of B2O3 in borosilicate glass occurred at a more positive potential than that of SiO2. X-ray photoelectron spectroscopy confirmed that the B2O3 component was reduced to B or a B-Si compound at 0.9 V vs. Ca 2+ /Ca. The reduction products prepared by the potentiostatic electrolysis of borosilicate glass at 0.9 V had granular morphology and consisted of crystalline Si. The Al2O3 component was not reduced at 0.9 V and the Na2O component was suggested to be dissolved in molten CaCl2 during electrolysis.

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“…However, reduction may occur in a molten salt, which does not contain water [10][11][12] . Therefore, we used a molten salt as the reaction medium.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Dy from a Mixture of Nd, Fe, B and Dy by Electrolysis in Molten LiCl

2016

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The electrodeposition and recovery of Dy was attempted by chlorinating Dy with Cl 2 generated at the anode by electrolysis in molten LiCl, in which Fe, B, Nd and Dy powders were added, then reducing the Dy ions, which were ionized from the dysprosium chloride, at the cathode. When the electrolysis in the LiCl bath was carried out even after the Fe, B, Nd and Dy powders were added to the LiCl bath, the electrodeposition of these metals on the cathode did not occur, thus the metals could not be recovered when the electrolysis in the LiCl bath was carried out even after the Fe, B, Nd and Dy powders were added to the LiCl bath. The mass increase due to the electrodeposition of Dy was observed at the cathode in the LiCl bath in which DyF 3 was added. The mass of the material electrodeposited at the cathode was greater in the LiCl bath, in which the Fe, B, Nd and Dy powders were added with DyF 3 , in comparison to that in the bath with only DyF 3 . It was found from analyzing the electrodeposited material by an X-ray diffraction technique and an electron probe microanalyzer that the material consisted of a large amount of Dy and a small amount of B. Examination of the cation concentration in the molten salt after electrolysis using an inductively coupled plasma instrument revealed that the molten LiCl, into which DyF 3 and the metal powders were added, contained the highest number of Dy ions. Thus, metallic Dy was cationized during the electrolysis in the molten LiCl bath containing DyF 3 and the metal powders, then the cationized Dy was reduced at the cathode and precipitated as metallic Dy.

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Direct electrochemical reduction of Dy2O3 in CaCl2 melt

Cited by 21 publications

References 17 publications

Electroreduction of Dy(III) assisted by Zn and its co‐deposition with Zn(II) in LiCl–KCl molten salt

Electroreduction of Dy(III) assisted by Zn and its co‐deposition with Zn(II) in LiCl–KCl molten salt

Electrochemical Reduction Behavior of Borosilicate Glass in Molten CaCl₂

Recovery of Dy from a Mixture of Nd, Fe, B and Dy by Electrolysis in Molten LiCl

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Direct electrochemical reduction of Dy2O3 in CaCl2 melt

Cited by 21 publications

References 17 publications

Electroreduction of Dy(III) assisted by Zn and its co‐deposition with Zn(II) in LiCl–KCl molten salt

Electroreduction of Dy(III) assisted by Zn and its co‐deposition with Zn(II) in LiCl–KCl molten salt

Electrochemical Reduction Behavior of Borosilicate Glass in Molten CaCl2

Recovery of Dy from a Mixture of Nd, Fe, B and Dy by Electrolysis in Molten LiCl

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Electrochemical Reduction Behavior of Borosilicate Glass in Molten CaCl₂