ENGINEERING, DESIGN, AND PROCESS DEVELOPMENT Electrorefining for Removing Fission Products from Uranium Fuels

Niedrach, L. W.; Glamm, Arthur C.

doi:10.1021/ie50558a018

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…110 The CV results suggest that UO 2 2+ goes through the two-step reduction process to UO 2 shown in Eqs. 15 Peaks C 2 and C 3 were not attributed to U redox chemistry. Rather, they arise as a result of impurities in the melt due to some corrosion of the platinum containment vessel.…”

Section: Electrochemistrymentioning

confidence: 97%

“…To further support the claims made in the LiCl-KCl Eutectic (chloride system) section, 6,46 Figs. 15 and 16 show that the direct oxidation of U metal to U(IV) (Eq. 11) was preferred over the U metal to U(III) oxidation (Eq.…”

Section: Electrochemistrymentioning

confidence: 99%

“…For both reactions 1 and 2, the molecular speciation of the U(III, IV) ions has been of interest since the beginning of uranium electrochemistry in alkali metal halide melts. Research in the field of uranium electrorefining from the 1950s 14,15 through 1992 was reviewed by Willit et al 16 The first review of the chemistry of actinide complexes in molten salts was published in 1971 by Kertes. 17 The historical context of the literature will only be briefly summarized here with regard to selected aspects of contemporary interest to pyroprocessing.…”

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confidence: 99%

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Review—Fundamental Uranium Electrochemistry and Spectroscopy in Molten Salt Systems

Hege¹,

Jackson²,

Shafer³

2023

J. Electrochem. Soc.

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Uranium is a key element used for nuclear energy production. Some advanced reactor designs, specifically molten salt reactors, continue to use uranium as the fissile material for energy production. These new technologies require an intimate understanding of uranium chemistry both during and after energy production. This review covers contemporary research on the coordination chemistry and behavior of uranium with the coolant and pyroprocessing salts as proposed for use in future reactor designs. Discussed topics include the nature of U redox reactions involving the reduction of U(III) to U metal and oxidation of U(III) to U(IV). These systems have been interrogated using cyclic voltammetry, chronopotentiometry, and optical and X-ray absorption spectroscopies. Insights obtained into the electrode potentials, the uranium species, and their diffusion coefficients in alkali halide melts from decades of research are summarized selectively. Perspectives are provided on the importance of unifying studies for comparison across multiple institutions. The application of synchrotron radiation research and multimodal approaches involving two (or more) probes, such as the widespread combination of UV-Visible spectroscopy and electroanalysis known as spectroelectrochemistry, can provide new knowledge about the main process of uranium electrorefining—diffusion, as will be demonstrated here through the lack of comparable results.

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Section: Electrochemistrymentioning

confidence: 97%