PROCESS FOR THE RECOVERY OF RUTHENIUM PRESENT IN AN AQUEOUS NITRIC SOLUTION AND APPLICATION OF THIS PROCESS TO A NITRIC SOLUTION OBTAINED BY DISSOLUTION OF IRRADIATED NUCLEAR FUEL ELEMENTS

摘要

Process for the recovery of the ruthenium present in an aqueous nitric solution, wherein the ruthenium is extracted in an organic solvent by contacting the nitric solution with an organic phase comprising an organophosphorous compound having at least one electron donor sulphur atom in the presence of a compound able to displace NO+ ions of the ruthenium complexes present in the nitric solution. Application to the recovery of ruthenium contained in a nitric solution obtained by dissolving irradiated fuel elements.