Method for preparing a mixture of powdered metal oxides from...

G - Physics – 21 – C

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G21C 3/44 (2006.01) C01B 13/34 (2006.01) C01G 43/00 (2006.01) C01G 43/01 (2006.01) C01G 56/00 (2006.01)

Patent

CA 2240267

A thermal decomposition method useful in the nuclear industry for preparing a powdered mixture of metal oxides having suitable reactivity from nitrates thereof in the form of an aqueous solution or a mixture of solids. According to the method, the solution or the mixture of solids is thermomechanically contacted with a gaseous fluid in the contact area of a reaction chamber, said gaseous fluid being fed into the reaction chamber at the same time as the solution or mixture at a temperature no lower than the decomposition temperature of the nitrates, and having a mechanical energy high enough to generate a fine spray of the solution or a fine dispersion of the solid mixture, and instantly decompose the nitrates. The resulting oxide mixtures may be used to prepare nuclear fuels.

L'invention concerne un procédé d'obtention par décomposition thermique d'un mélange pulvérulent d'oxydes métalliques, de réactivité appropriée, appartenant à la filière nucléaire, à partir de leurs nitrates se présentant sous forme d'une solution aqueuse ou d'un mélange de solides. Le procédé se caractérise en ce qu'on réalise dans une zone de contact d'une chambre de réaction, le contact thermomécanique entre la solution ou le mélange solide et un fluide gazeux introduit simultanément dans la chambre de réaction, ce fluide gazeux étant à une température au moins égale à la température de décomposition des nitrates et possédant une énergie mécanique suffisamment forte pour produire une pulvérisation fine de la solution ou une dispersion fine du mélange solide, et réaliser en instantané la décomposition des nitrates. Les mélanges d'oxdes ainsi obtenus peuvent être utilisés dans la préparation de combustibles nucléaires.

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