Commissariat a L'energie Atomique Et Aux Energies Alternatives

Orano Cycle

Stéphane Vaudez

Méryl Brothier

Anne-Charlotte Robisson

King-Wo Li

A method for transporting non-flowable powders includes the following steps: mixing and suspending powders and carbon dioxide in the solid form, with the introduction of a cryogenic fluid, to obtain a cryogenic suspension; setting the cryogenic suspension in motion to enable transport thereof, controlling the motion of the cryogenic suspension according to one or more parameter(s) related to the first mixing and suspending step.

Method and device for transporting powders

A device for granulating powders by cryogenic atomisation, characterised in that it comprises: a device for mixing powders by cryogenic fluid, comprising at least one chamber for mixing powders, comprising a cryogenic fluid; and a device for atomising a suspension of powders mixed by the device for mixing powders in order to allow a granulation of the powders, comprising a way of fractionating the suspension of powders making it possible to adjust the size of the droplets of powders to be atomised, and a method for adjusting the moisture of the mixed powders and/or the moisture of the atomisation atmosphere.

Device for granulating powders by cryogenic atomisation

A device for mixing powders by cryogenic fluid, characterised in that it comprises at least: a chamber for mixing powders, comprising a cryogenic fluid; a chamber for supplying powders in order to allow the powders to be introduced into the mixing chamber; means for agitation in the mixing chamber so as to allow the mixing of the powders placed in suspension in the cryogenic fluid.

Device for mixing powders by cryogenic fluid

A device for mixing powders by a cryogenic fluid, characterised in that it comprises: a chamber for mixing the powders, comprising a cryogenic fluid, provided with means for forming a fluidised powder bed; a chamber for supplying powders in order to allow the powders to be introduced into the mixing chamber; a chamber for supplying cryogenic fluid in order to allow the cryogenic fluid to be introduced into the mixing chamber; a system for generating vibrations in the fluidised powder bed; and a system for controlling the system for generating vibrations.

Device for mixing powders by cryogenic fluid and generating vibrations

The present invention relates to a process for sintering a compacted powder of at least one oxide of a metal selected from an actinide and a lanthanide, this process comprising the following successive steps, carried out in a furnace and under an atmosphere comprising an inert gas, dihydrogen and water:

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Avignon, France

Stéphane Vaudez