Authors:
F. JuilletDRDD-SPHA-SAED CEA, Centre d'études Valrho BP 171 30207 Bagnols sur Ceze Cedex France

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J. AdnetDRDD-SPHA-SAED CEA, Centre d'études Valrho BP 171 30207 Bagnols sur Ceze Cedex France

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M. GasgnierUniversité Paris-Sud ICMO, URA 478, Laboratorire des Réactions Sélectives sur Support, Bat. 410 91405 Orsay Cedex France

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Abstract  

Refractory oxides such as CeO2 and PuO2 are very difficult to be dissolved. They often involve the use of powerful reagents which further management is difficult (especially for nuclear waste). Conceming PuO2 used in nuclear fuels manufacturing, new dissolution techniques has been studied using ultrasound effects (20, 500 and 700 kHz) on powder oxides dipped into the nitric acid solutions. The experiment was tested to produce free radicals generated by cavitation (bubble implosion) to obtain either the oxidative or reducing conditions required for PuO2 dissolution. The formation of submicronic particles easier to solubilize was investigated. To enhance the dissolution mechanism and the production of free radicals, various scavengers (organic acids or alcohols) and solubilized gases were tested. The mechanical and chemical effects on oxide dissolution behavior were analyzed.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)

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