Commissariat a L'energie Atomique Et Aux Energies Alternatives

Electricite De France

Commissariat a L'energie Atomique Et Aux Energies

Orano Cycle

Ocp Sa

Eugen Andreiadis

Manuel Miguirditchian

Driss Dhiba

Christian Sorel

Cécile Marie

Renaud Demadrille

Marinella Mazzanti

Hamid Mazouz

Marion Giraud

Dominique Guillaumont

Emilie Russello

Marie-Thérèse Duchesne

Clémence Berger

Guillaume Mossand

Abla Ouaattou

Marie-Therese Duchesne

The use of a synergistic mixture of extractants for extracting at least one rare earth element from an aqueous medium comprising phosphoric acid. The mixture comprises: —a first extractant of formula (I): wherein Rand R, which are identical or different, represent a linear or branched, saturated or unsaturated hydrocarbon group, comprising from 6 to 12 carbon atoms, or a phenyl group optionally substituted by a linear or branched, saturated or unsaturated hydrocarbon group, comprising from 1 to 10 carbon atoms; and—a second extractant of formula (II): in which Rrepresents a linear or branched alkyl group, comprising from 6 to 12 carbon atoms. Use of the synergistic mixture in the treatment of phosphate minerals with a view to recovering the rare earth elements contained in the minerals.

Use of synergistic mixture of extractants for extracting rare earth elements from an aqueous medium comprising phosphoric acid

The use of carbamides as extractants for fully or partially separating uranium(VI) from plutonium(IV) in an aqueous solution obtained by dissolving a spent nuclear fuel in nitric acid, by method of liquid-liquid extraction, without carrying out any reduction of the plutonium(IV) to plutonium(III). The invention also relates to new carbamides. Uses are the processing of spent nuclear fuels based on uranium (especially uranium oxides&#x2014;UOX) or uranium and plutonium (especially mixed uranium and plutonium oxides&#x2014;MOX).

Carbamides for separating uranium(VI) and plutonium(IV) without reducing the plutonium(IV)

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Avignon, France

Eugen Andreiadis