CsAlSiO4, one of the hosts for the immobilization of Cs from nuclear wastes, altered extensively in solutions of low and high cationic activity under mild hydrothermal conditions which may be expected in a radwaste repository. For example, the CsAlSi04 phase changed to pollucite and chlorite in deionized water and 3 n MgCl2 brine, respectively, releasing 1.3% to 98.6% of its Cs into solution at temperatures of 100-300 °C for 4 weeks under a confining pressure of 300 bar. These and earlier results indicate that under radwaste repository conditions pollucite is a stable phase but not the CsAlSiO4 phase and, therefore, CsAlSiO4 is not a good host for the immobilization of Cs from nuclear wastes.
All Science Journal Classification (ASJC) codes
- Waste Management and Disposal
- Environmental Science(all)
- Earth and Planetary Sciences(all)