Process for fixation of radioactive Krypton in zeolites for ultimate disposal

摘要

the invention concerns a method for immobilization of radioactive noble gases, in particular of radioactive krypton in zeolites.in which the inert gas for a heat treatment of the zeolite matrix under high pressure in the voids in the fabric of the zeolite matrix injected and while maintaining the pressure by cooling thematrix in the cavities is included.in the reprocessing plants for irradiated nuclear fuels is a seizure of large quantities of radioactive noble gases, so entrenched to bethat you, too, at temperatures between 473 k, and that the waste containing matrix not to be released.it is the task of the invention is a process to provide the satisfying these needs and the maximum amount of gas per unit weight of waste matrix can be fixed.the invention solves the task by a erdalkalisubstituierter zeolite as a matrix, called the 5 a (= 0.5 nm) porendurchmesser and general compositionis used. the strength of the noble gas in the pores of the zeolite is carried out at a temperature in the range of 720 k to 870 k and a pressure of 200 bar to approximately 2000 bar.after the cooling, the edelgasatome in beta cavities of zeolites was thermally stable.