Compagnie Generale Des Matieres Nucleaires

Cogema Compagnie Generale Des Matieres Nucleaires

Micheline Draye

Marc Lemaire

Jacques Foos

Alain Guy

Rodolph Chomel

Vincent Guyon

Gerard Le Buzit

Pierre Doutreluingne

Thierry Moutarde

Andre Deloge

Rene Chevillotte

The invention relates to a process fop trapping gaseous ruthenium on polyvinyl pyridine, more particularly usable for recovering radioactive ruthenium from irradiated nuclear fuels. This process consists of contacting a gas containing ruthenium in gaseous form with an adsorbent (11b) constituted by a vinyl pyridine polymer or copolymer for fixing the ruthenium to the latter. The gas can be constituted by yapours from a concentrate of fission products containing ruthenium, which has been heated (at 31) in the presence of an oxidizing agent for volatilizing the ruthenium.

Process for trapping gaseous ruthenium on polyvinyl pyridine, more

The invention relates to a process for the separation of at least one element such as Nb, Sb, Ce+Pr, actinides and elements from groups VIIb and VIII of the Periodic Classification of Elements from aqueous solutions resulting from the reprocessing of spent nuclear fuels. This process consists of contacting said aqueous solution with a solid resin based on a vinyl pyridine polymer or copolymer and separating from said solution the resin used for fixing said element or elements. The resin is in particular a poly(vinyl-4-pyridine) powder in crosslinked from and the separated elements are e.g. ruthenium, rhodium, palladium, technetium, manganese, cobalt, iron, nickel, cerium and praseodymium.

Process for the separation of certain elements from aqueous solutions

The invention relates to the use of thioether ligands in accordance with the formula: ##STR1## in which R.sup.1 and R.sup.2, which can be the same or different, represent alkyl radicals, R.sup.3 is an alkyl radical and A represents a divalent radical chosen from among the radicals of formula:

Use of thioether ligands for separating palladium from aqueous solutions

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Lyons, France

Micheline Draye