Phenomene de concentration du fer au voisinage de la cathode au cours de l'electroraffinage de l'uranium en bains de sels fondus

Chauvin, G.; Coriou, H.; Simenauer, A.

doi:10.1016/0013-4686(63)80062-6

Cited by 5 publications

(3 citation statements)

References 4 publications

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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%

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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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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Uranium Electrorefining in 3LiCl-2KCl Based Melts

et al. 2020

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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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