RADIOACTIVE WASTE IMMOBILIZATION MATRIX COMPRISING AT LEAST ALKALI SALTS AND METHOD FOR IMMOBILIZATION OF THESE RADIOACTIVE WASTE COMPRISING AT LEAST ALKALINE SALTS TO OBTAIN THE IMMOBILIZATION MATRIX

摘要

The subject of the present invention is a process for the immobilization of radioactive waste comprising at least alkaline salts, characterized in that the process comprises at least: a step (201, 401) of pretreatment by drying of a radioactive waste concentrate ( 200, 400), a step (206, 406) for mixing radioactive waste pretreated with the addition of compounds capable of vitrifying or ceramizing the pretreated radioactive waste, a step of calcination and melting of the mixture, a melting step (202, 400). , 402) of the calcined mixture at a temperature below 1050 ° C to obtain a melt, a melt cooling step to obtain (203, 403) a radioactive waste immobilization matrix.