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Etude de la réduction électrochimique d'oxydes d'actinides en milieu sels fondus

Abstract : Reactive metals are currently produced from their oxide by multiple steps reduction techniques. A one step route from the oxide to the metal has been suggested for metallic titanium production by electrolysis in high temperature molten chloride salts. In the so-called FFC process, titanium oxide is electrochemically reduced at the cathode, generating O2- ions, which are converted on a graphite anode into carbon oxide or dioxide. After this process, the spent salt can in principle be reused for several batches which is particularly attractive for a nuclear application in terms of waste minimization. In this work, the electrochemical reduction process of cerium oxide (IV) is studied in CaCl2 and CaCl2-KCl melts to understand the oxide reduction mechanism. Cerium is used as a chemical analogue of actinides. Electrolysis on 10 grams of cerium oxide are made to find optimal conditions for the conversion of actinides oxides into metals. The scale-up to hundred grams of oxide is also discussed.
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https://tel.archives-ouvertes.fr/tel-00680359
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Benoît Claux. Etude de la réduction électrochimique d'oxydes d'actinides en milieu sels fondus. Autre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENI014⟩. ⟨tel-00680359⟩

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