Commissariat a L'energie Atomique

Compagnie Generale Des Matieres Nucleaires

Alain Hanssens

Charles Madic

Marie-Francois Debreuille

Michel Morin

Claire Mesmin

Pierre Blanc

Jean P Goumondy

The present invention generally relates to the preparation of mixed actinide oxides, such as mixed oxides of uranium and plutonium (U, Pu) O, by simultaneously coprecipitation and then calcinations.

Method for co-precipitating actinides and method for preparing mixed actinide oxides

The present invention is directed towards a lining of a pulsed column which allows for an extended exchange of the solid phase with the liquid phase. The lining is composed of stacked baskets and rings, the baskets having a perforate bottom and the rings having a central hole. The size of the perforations in the baskets are such that the solid phase is retained therein while the central hole in the rings allows the solid phase to pass therethrough and go on to the next lower basket. The inside of the column is subjected to high frequency, low energy pulsations which move the liquid and solid phase in a back-and-forth manner. Additionally, the inside of the column is subjected to extremely low frequency, high energy pulsations so as to remove one portion of the solid phase located in a basket and cause it to go down towards a next lower basket.

Pulsed column with basket lining

The present invention relates to a device for atomizing a reaction mixture, said device enabling the reaction mixture to be atomized in a reactor with the aid of at least a first gas and an atomizing nozzle. This device further comprises a supply of a second hot gas at the top of the atomizing device, serving to dry the atomized mixture, a supply of a third gas and means for distributing this third gas comprising an annular space of adjustable width and adapted to distribute in the reactor said third gas in the form of a ring along the inner wall of the reactor, so as to avoid any contact between the reaction mixture and said wall. The invention is applicable to the atomization of a reaction mixture.

Device for atomizing a reaction mixture

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Tresques, France

Alain Hanssens