Contribution a la connaissance du mecanisme de l'electroraffinage de l'uranium en bains de sels fondus

Boisdie, G.; Chauvin, G.; Coriou, H.; Hure, J.

doi:10.1016/0013-4686(61)87004-7

Cited by 15 publications

(4 citation statements)

References 7 publications

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“…There is a large number of works devoted to studying behavior and properties of uranium in fused alkali chlorides and their mixtures. There are works containing the information concerning properties of uranium in individual fused chlorides (1)(2)(3), LiCl-KCl eutectic (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15), NaCl-KCl equimolar mixture (2,3,(16)(17)(18)(19) and NaCl-CsCl eutectic mixture (20). Ternary LiCl-KCl-CsCl eutectic has the lowest melting point (536 K) of all alkali chloride binary or ternary mixtures and thus is interesting from the technological as well as fundamental point of view as having very wide temperature range of the liquid state.…”

Section: Introductionmentioning

confidence: 99%

An Electrochemical Study of Uranium (III) and (IV) Species in Fused Alkali Chlorides

et al. 2014

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The behavior of uranium(III) and (IV) chloro-species was studied in LiCl-KCl-CsCl eutectic melt between 573 and 1073 K by potentiometry, cyclic voltammetry and chronopotentiometry. Uranium formal standard electrode potentials and U(III)/U(IV) formal red-ox potentials in the given melt were determined and thermodynamic properties of uranium chlorides calculated. Diffusion coefficients of U(III) and U(IV) ions were determined employing cyclic voltammetry and chronopotentiometry measurements.

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Section: Introductionmentioning

confidence: 99%

An Electrochemical Study of Uranium (III) and (IV) Species in Fused Alkali Chlorides

et al. 2014

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“…The following parameters were chosen for preliminary experiments concerning the electrodeposition of uranium on solid molybdenum cathode: uranium concentration in the melt -30 mol. %, temperature -450-500 °C, cathodic and anodic current densities -0.1 A/cm 2 (8,9). Uranium dendrites were the only product formed under the described conditions on molybdenum crucible acting as the cathode.…”

Section: Introductionmentioning

confidence: 80%

“…The most detailed investigation of uranium electrorefining in 3LiCl-2KCl-based melts under galvanostatic conditions was performed in Commissariat à l'énergie atomique (CEA), France (8)(9)(10). The following parameters were chosen for preliminary experiments concerning the electrodeposition of uranium on solid molybdenum cathode: uranium concentration in the melt -30 mol.…”

Section: Introductionmentioning

confidence: 99%

Uranium Electrorefining in 3LiCl-2KCl Based Melts

et al. 2020

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The process of uranium electrorefining in 3LiCl–2KCl based melts was investigated. Dense and compact uranium deposits were obtained at low current densities, while application of relatively high current densities led to the formation of uranium dendrites. Cathodic current efficiency in the majority of experiments confirmed the three-electron scheme of uranium reduction. Cathodic current efficiency under certain conditions exceeded 95%. The amount of salt retained in the cathodic deposit varied from 7 to 26%, these values typical for dendrite electrolytic metals.

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“…98,102 The reduction mechanism of UCl3 was found to be a single three-electron transfer step. [103][104][105] Whereas UCl4 reduction occurred via a two stage electron transfer. First a one electron reduction to U 3+ followed by the three electron transfer for U 3+ .…”

Section: Similarmentioning

confidence: 99%

Chemical Understanding of Actinide Separations

Servis

McCann

et al. 2021

Encyclopedia of Inorganic and Bioinorganic Chemistry

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This article provides a broad overview of the separation processes used to isolate actinides and the experimentally and computationally determined chemical characteristics that define those separations. The redox chemistry of the actinides plays a pivotal role in both aqueous and pyrochemical processing separations. The nearoverlapping energies of the 6d and 5f orbitals in the light actinides allows for facile adjustment of actinide oxidation states, which is used in many established separation methods. In contrast, the stable, generally 3+oxidation states of the midand heavy actinides can make them difficult to separate from the similarly lanthanides(III). In aqueous separations, the tendency of the actinides to form anionic and neutral aqueous complexes with a variety of complexants (especially soft donors) is used to achieve high separation factors between chemically similar elements in both solid-liquid separations and liquid-liquid extraction. This selectivity can be further tuned through the use of specialized organic or solid phase ligands. Pyroprocessing separations utilize the unique redox behavior of the actinides to adjust their distribution between a molten salt electrolyte and either a solid electrode or molten metal phase. Atomic-level insights into the mechanisms underlying actinide separation processes, with the ultimate goal of predicting separation behavior, can be provided by electronic structure and statistical mechanicalbased calculation methods.

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Contribution a la connaissance du mecanisme de l'electroraffinage de l'uranium en bains de sels fondus

Cited by 15 publications

References 7 publications

An Electrochemical Study of Uranium (III) and (IV) Species in Fused Alkali Chlorides

An Electrochemical Study of Uranium (III) and (IV) Species in Fused Alkali Chlorides

Uranium Electrorefining in 3LiCl-2KCl Based Melts

Chemical Understanding of Actinide Separations

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