Use of ozone for dissolving high-level plutonium dioxide in nitric acid in the presence of Am(V,VI) ions

Gelis, V. M.; Shumilova, Yu. B.; Ершов, Б. Г.; Maslennikov, A. G.; Milyutin, V. V.; Kharitonov, O. V.; Logunov, M. V.; Voroshilov, Yu. A.; Bobritskii, A. V.

doi:10.1134/s1066362211060087

Cited by 6 publications

(1 citation statement)

References 5 publications

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“…This route also offers the possibility to catalyze the dissolution with the electrochemical or ozone regeneration of relevant ions thereby limiting the amount of required chemicals. 3,[9][10][11]15,[23][24][25][26][27][28][29][30] Such a process has been industrially scaled with Ag(II) at La Hague (Normandy, France) which enables the very fast dissolution of PuO 2 at almost room temperature. Nevertheless, an overconsumption of Ag(II) (and related energy to regenerate the species) has been observed in the presence of organic materials or some fission products in the dissolver.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-assisted reductive dissolution of CeO₂and PuO₂in the presence of Ti particles

et al. 2016

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PuO2 is considered an important material for current and future nuclear fuel; however it is a very refractive compound towards dissolution. Among other techniques, its reprocessing can be performed via complexing dissolution in concentrated and boiling nitric acid containing hydrofluoric acid, or via oxidant dissolution in the presence of reagents with redox couples having high potentials such as Ce(iv)/Ce(iii), or Ag(ii)/Ag(i). Reductive dissolution can be performed under softer conditions and is considered an alternative to these methods which may suffer from several drawbacks (corrosion, effluent management, compatibility with nuclear waste disposal, etc.). In this study, a sonochemical and reductive approach is investigated for PuO2 dissolution under relatively mild conditions. At the first stage, the experiments are performed with CeO2 as an inactive surrogate for PuO2. The quantitative dissolution of both oxides can be achieved under ultrasound (20 kHz, 0.35-0.70 W mL(-1)) in 0.5 M HNO3/0.1 M [N2H5NO3]/2 M HCOOH sparged with Ar at 33-35 °C in the presence of Ti particles as a generating source of reductive species. Ultrasound enables the depassivation of the Ti surface (usually strongly passivated in nitric solutions) through acoustic cavitation which then allows further generation of the intermediate Ti(iii) reductive species. Dissolution rates and yields can be further increased with the injection of dilute fluoride aliquots (NH4F or HF) in the sonicated solution to favor Ti chemical depassivation. The rapid and complete dissolution of PuO2 under selected conditions is accompanied by Pu(iii) accumulation in solution.

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Section: Introductionmentioning

confidence: 99%

Ultrasound-assisted reductive dissolution of CeO₂and PuO₂in the presence of Ti particles

et al. 2016

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Dissolution kinetics of CeO 2 powders with different morphologies and analogy to PuO 2 dissolution

Ziouane

Milhau²,

Maubert³

et al. 2018

Hydrometallurgy

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Americium and Plutonium Purification by Extraction (the AMPPEX process): Development of a new method to separate 241Am from aged plutonium dioxide for use in space power systems

Brown

Campbell

Carrigan

et al. 2018

Progress in Nuclear Energy

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Use of ozone for dissolving high-level plutonium dioxide in nitric acid in the presence of Am(V,VI) ions

Cited by 6 publications

References 5 publications

Ultrasound-assisted reductive dissolution of CeO₂and PuO₂in the presence of Ti particles

Ultrasound-assisted reductive dissolution of CeO₂and PuO₂in the presence of Ti particles

Dissolution kinetics of CeO 2 powders with different morphologies and analogy to PuO 2 dissolution

Americium and Plutonium Purification by Extraction (the AMPPEX process): Development of a new method to separate 241Am from aged plutonium dioxide for use in space power systems

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Use of ozone for dissolving high-level plutonium dioxide in nitric acid in the presence of Am(V,VI) ions

Cited by 6 publications

References 5 publications

Ultrasound-assisted reductive dissolution of CeO2and PuO2in the presence of Ti particles

Ultrasound-assisted reductive dissolution of CeO2and PuO2in the presence of Ti particles

Dissolution kinetics of CeO 2 powders with different morphologies and analogy to PuO 2 dissolution

Americium and Plutonium Purification by Extraction (the AMPPEX process): Development of a new method to separate 241Am from aged plutonium dioxide for use in space power systems

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Ultrasound-assisted reductive dissolution of CeO₂and PuO₂in the presence of Ti particles

Ultrasound-assisted reductive dissolution of CeO₂and PuO₂in the presence of Ti particles