Process for separating trivalent actinides from trivalent lanthanides in an acidic aqueous solution

摘要

The subject of the invention is a? Process? separation of actinides and lanthanides present in the trivalent state in an acidic aqueous solution. The acidic aqueous solution is brought into contact with a solvent comprising a first extractant consisting of an organic ligand with an electron donor nitrogen atom such as 2,4,6-tri (2-pyridyl) 1,3,5- triazine, and a second extractant consisting of an acid-soluble organosoluble compound or a salt thereof such as dinonylnaphthalene sulfonic acid or its sodium salt, which makes it possible to selectively extract the actinides in the organic solvent. Application to the treatment of radioactive effluents.