Reaction of lithium oxide with LiCl–UCl4 and LiCl–KCl–UCl4 melts

Kozlova, A. A.; Рыжов, А. А.; Ivanov, Alexander B.; Maltsev, Dmitry S.; Shchetinskiy, A. V.; Петров, А. И.; Volkovich, Vladimir A.

doi:10.1063/1.5134184

PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2019): Proceedings of the VI International Young Researchers’ Conference 2019

DOI: 10.1063/1.5134184

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Reaction of lithium oxide with LiCl–UCl4 and LiCl–KCl–UCl4 melts

A. A. Kozlova

А. А. Рыжов

Alexander B. Ivanov

et al.

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2023

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“…Addition of lithium oxide to LiCl-UCl 4 and LiCl-KCl-UCl 4 melts 12,16 had a considerably smaller impact than on the corresponding UCl 3 containing melts. Just over 80% uranium was precipitated from LiCl-KCl based melts at O 2-: U 4+ molar ratio z E-mail: v.a.volkovich@urfu.ru of two at 550 °C and under 95% at 750 °C.…”

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Reaction of Oxygen with Uranium (IV) Chloride in Fused Alkali Chlorides

Volkovich

Рыжов

2023

J. Electrochem. Soc.

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Reaction of oxygen with solutions of uranium(IV) chloride in fused LiCl and three alkali chloride eutectic mixtures (LiCl–KCl, NaCl–KCl–CsCl, and NaCl–CsCl) was investigated at 550–750°C. Bubbling oxygen or oxygen-containing gas mixtures (O2–H2O, O2–Ar, O2–H2O–Ar) through LiCl–UCl4 melts resulted in significant precipitation of uranium (up to 87%) in the form of oxides and alkali uranates. Increasing mean radius of the solvent melt cations decreased the degree of uranium precipitation and uranyl chloride (soluble in the melt) became the main product of the reaction. High-temperature spectroscopy measurements were employed to determine the kinetic parameters of the reaction in LiCl–KCl, NaCl–KCl–CsCl, and NaCl–CsCl melts. Reaction rates, order, rate constants, and activation energy values were estimated. Increasing temperature led to increased reaction rates but the effect of uranium chloride concentration depended on the cationic melt composition. Oxygen reacts with uranium(IV) containing melts much faster than with the melts containing rare earth chlorides and oxygen sparging can be implemented for separating uranium and rare earth fission products in pyrochemical reprocessing of spent nuclear fuels.

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confidence: 91%

Reaction of Oxygen with Uranium (IV) Chloride in Fused Alkali Chlorides

Volkovich

Рыжов

2023

J. Electrochem. Soc.

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Reaction of lithium oxide with LiCl–UCl4 and LiCl–KCl–UCl4 melts

Cited by 1 publication

References 9 publications

Reaction of Oxygen with Uranium (IV) Chloride in Fused Alkali Chlorides

Reaction of Oxygen with Uranium (IV) Chloride in Fused Alkali Chlorides

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