Methods of consolidating radioactive containing materials by hot isostatic pressing

摘要

The present disclosure relates to a method of consolidating a calcine comprising radioactive material, the method comprising mixing 60-80% (by weight) of a radionuclide containing calcine with at least one non-radioactive additive, such as an oxide, and hot isostatic pressing the mixture to form a stable monolith of glass/ceramic. In one embodiment, the ratio of radionuclide containing calcine to additives is about 80:20 by weight, wherein the non-radioactive additive comprises oxides such as BaO, CaO, Al2O3, TiO2, SiO2 and others, that combine with the waste elements and compounds to form a ceramic mineral or glass/ceramic material, after hot isostatic pressing. Non-limiting examples of mineral phases that may be formed are: hollandite (BaAl2Ti6O16), zirconolite (CaZrThO7), and perovskite (CaTiO3).

主权项

1. A method of consolidating a calcined material comprising radioactive material, said method comprising:
mixing a radionuclide containing calcine with at least one additive to form a pre-HIP powder; loading the pre-HIP powder into a can; sealing the can; loading the sealed can through a bottom of a HIP vessel; closing said HIP vessel; and hot-isostatic pressing the sealed can within the HIP vessel at a temperature ranging from 1000° C. to 1250° C. and a pressure ranging from 30 to 100 MPa for a time ranging from 10-14 hours.