Patent ID: 9029278
Filing Date: 2015-05-12
Classification: C03C,G21F

Abstract:
1. A method for treating a radioactive liquid effluent of medium activity, wherein calcination of said effluent, to which is optionally added a calcination adjuvant, is carried out in order to obtain a calcinate, and a vitrification adjuvant for producing an alumino-borosilicate glass is then added to said calcinate, the vitrification adjuvant having the following composition expressed in percentages by mass: SiO B Na Al Li CaO: 1.5 to 4 ZrO Fe NiO: 0 to 2 CoO: 0 to 2, it is proceeded with the melting of said calcinate and of said vitrification adjuvant in a cold crucible in order to obtain a glass melt, and said glass melt is then cooled down, whereby the alumino-borosilicate glass is obtained having the following composition expressed in percentages by mass based on the total mass of the glass: a) SiO b) B c) Na d) Al e) one or more element(s) ETR selected from oxides of transition elements and platinoids: where ETR is in the range of >0 to 5.25; f) One or more element(s) TRA selected from rare earth oxides and from actinides oxides: where TRA is in the range of 0 to 3.5; g) ZrO h) Other elements AUT of the effluent: where AUT is in the range of 0 to 4; and the composition of the glass further satisfies all of the following inequations in which the SiO