Behavior of Impurity Elements at Electrochemical Crystallization of UO<sub>2</sub>from Molten Salt Electrolytes

Komarov, V.E.; Borodina, N.P.; Смоленский, В. В.

doi:10.1023/b:rach.0000015752.15427.c7

Cited by 3 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason for the shift of the diffraction peaks may be that Ag with a smaller radius enters the UO 2 lattice during the electrodeposition process, resulting in lattice distortion of the UO 2 crystal and making the UO 2 unit cell parameters smaller. Komarov et al 29 studied the effects of the fission element ions Ru 3+ and Ce 3+ on electrodeposition of UO 2 . They also found that the unit cell parameters of UO 2 decreased with the increase of CeO 2 content.…”

Section: Comparison Of Electrochemical Behaviors Ofmentioning

confidence: 99%

“…Thereby, some scholars have investigated the influences of fission product ions on the electrochemical behavior of + UO 2 2 and recovery of UO 2 from molten salt. For example, Komarov et al 29 studied the effects of the fission element ions Ru 3+ and Ce 3+ on electrodeposition of UO 2 . Constant current electrolysis results indicated that UO 2 grains with good surface density, and ruthenium dendrites were simultaneously deposited on Pt electrode.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Impact of Ag on Electrochemical Recovery of UO₂ in Molten LiCl-KCl Salt

Han,

Lan,

Zhang

et al. 2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

To investigate the effect of fission element Ag on the electrochemical recovery of UO2, the electroreduction mechanisms of Ag+ and UO 2 2 + , kinetic property of Ag+/Ag couple were first studied on W electrode by different electrochemical techniques. The electrode reactions of Ag+ and UO 2 2 + were found to be one-step and two-step reduction processes, respectively. The exchange current density of Ag+/Ag couple was estimated to be 0.0431∼0.0727 A cm−2 in the temperature range of 723∼798 K by LP technique, and its activation energy was evaluated to be 33.91 kJ mol−1. The deposition products obtained by constant potential electrolysis (CPE) were characterized by XRD and SEM-EDS, which showed the formed Ag and UO2 having pine-branch and micron-scale polyhedral structure, respectively. The influence of Ag+ on the electrochemical behavior of UO 2 2 + and morphology of UO2 were studied. The deposition potential of Ag+ was close to that of UO 2 + to UO2. The changes of Ag+ concentration and scan rate had no effect on the electroreduction mechanism of UO 2 2 + . CPE was conducted, and the result indicated that UO2 and Ag could be co-deposited. The deposited Ag could change the morphology of recovered UO2.

show abstract

Section: Comparison Of Electrochemical Behaviors Ofmentioning

confidence: 99%

mentioning

confidence: 99%

Impact of Ag on Electrochemical Recovery of UO₂ in Molten LiCl-KCl Salt

Han,

Lan,

Zhang

et al. 2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…, Ru 3+ , Rh 3+ and Pd 2+ ions uranium dioxide is ECS Transactions, 33 (7) 371-379 (2010) deposited together with the corresponding platinum metals (25). In the presence of the oxygen-containing molybdenum species MoO 2…”

Section: +mentioning

confidence: 99%

“…These concern the reactions of uranyl species upon the addition of or in the presence of certain cations or metallic elements in the melt. The effect of certain fission product elements on the cathodic deposition of UO 2 has been studied by Komarov et al (24,25). In the presence of Zr(IV) ions the cathodic UO 2 product contained ZrO 2 .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Fission Product Elements on the Behavior of Uranyl Species in Alkali Chloride Melts: a Contribution towards Reprocessing Spent Oxide Fuels

Volkovich¹,

Aleksandrov²,

Vasin³

et al. 2010

ECS Trans.

View full text Add to dashboard Cite

The reactions of uranyl(VI) containing chloride melts with molybdenum, niobium, zirconium and palladium were studied using high temperature electronic absorption spectroscopy. Depending on the nature of the added element uranium is reduced to uranyl(V) and uranium(IV) chloro-species and UO2. Palladium, niobium and zirconium can all be removed from a uranyl(VI)-containing melt using molybdenum metal and the melt can then be purified from Mo(III) ions by bubbling Cl2 gas. Such approach can be employed for removal a number of fission product elements from molten chloride baths during reprocessing spent oxide fuels.

show abstract

“…In the literature, there is information on the preparation of crystalline solid solutions UO 2 -ZrO 2 2-5 and UO 2 -NbO 2 2 during the electrolysis of salt melts. Komarov et al 2 obtained UO 2 cathode deposits, which contained up to 5 mol% of zirconium and niobium oxides. We synthesized UO 2 -ZrO 2 crystalline deposits, and the concentration of zirconium dioxide reached 98 mol% upon electrolysis of the salt melt (NaCl-KCl)-UO 2 Cl 2 -ZrCl 4 ; furthermore, the mechanism of their formation was suggested.…”

mentioning

confidence: 99%

Electrolytic Formation of Solid Crystalline UO₂–ThO₂ and UO₂–ThO₂–ZrO₂ Solutions from Salt Melts

Krotov

Filatov

2020

J. Electrochem. Soc.

View full text Add to dashboard Cite

For the first time, crystalline solid solutions of UO2–ThO2 and UO2–ThO2–ZrO2 have been electrolytically prepared. The mechanism of their formation in molten halides is presented. The influence of the electrolysis current density on the compositions of the cathode deposits has been established and explained. We also established the effect of zirconium ions on the ThO2 content in the UO2–ThO2–ZrO2 cathode deposits.

show abstract

Behavior of Impurity Elements at Electrochemical Crystallization of UO₂from Molten Salt Electrolytes

Cited by 3 publications

References 1 publication

Impact of Ag on Electrochemical Recovery of UO₂ in Molten LiCl-KCl Salt

Impact of Ag on Electrochemical Recovery of UO₂ in Molten LiCl-KCl Salt

The Effect of Fission Product Elements on the Behavior of Uranyl Species in Alkali Chloride Melts: a Contribution towards Reprocessing Spent Oxide Fuels

Electrolytic Formation of Solid Crystalline UO₂–ThO₂ and UO₂–ThO₂–ZrO₂ Solutions from Salt Melts

Contact Info

Product

Resources

About

Behavior of Impurity Elements at Electrochemical Crystallization of UO2from Molten Salt Electrolytes

Cited by 3 publications

References 1 publication

Impact of Ag on Electrochemical Recovery of UO2 in Molten LiCl-KCl Salt

Impact of Ag on Electrochemical Recovery of UO2 in Molten LiCl-KCl Salt

The Effect of Fission Product Elements on the Behavior of Uranyl Species in Alkali Chloride Melts: a Contribution towards Reprocessing Spent Oxide Fuels

Electrolytic Formation of Solid Crystalline UO2–ThO2 and UO2–ThO2–ZrO2 Solutions from Salt Melts

Contact Info

Product

Resources

About

Behavior of Impurity Elements at Electrochemical Crystallization of UO₂from Molten Salt Electrolytes

Impact of Ag on Electrochemical Recovery of UO₂ in Molten LiCl-KCl Salt

Impact of Ag on Electrochemical Recovery of UO₂ in Molten LiCl-KCl Salt

Electrolytic Formation of Solid Crystalline UO₂–ThO₂ and UO₂–ThO₂–ZrO₂ Solutions from Salt Melts