In order to develop SHS technology for immobilizing radioactive graphite containing An 4+, CeO 2 was used as the simulacrums for An 4+, the waste forms were synthesized by designed equipment and using C, Al and TiO 2 powders as the starting materials. The phase, solubility of An 4+ and the relationship of phases in waste forms were analyzed by the help of X-ray diffraction (XRD) instrument. Moreover, the crystal cell parameters were calculated by structural refinement method. The results indicate that the solubility of simulacrum in waste forms is 3%(in weight)treating the radioactive wastes containing An 4+ by the reaction: 3C+4Al+3TiO 2 = 2Al 2O 3+3TiC. The waste forms exist as Al 2O 3, TiC, C, TiO 2 and AlN phase when the contents of CeO 2 in the range of solubility. Crystal cell parameters a, b and c in Al 2O 3 crystal lattices change about 10 -3 nm magnitude, the value of V varies about 10 -3 nm 3 magnitude, and α, β and γ change from (10 -3)° to (10 -1)° magnitude. The crystal cell parameters a, b, c of TiC in combustion products vary about 10 -3nm magnitude, and the volume of crystal cell changes about 10 -3 nm 3 magnitude, and α, β and γ are not found changes. The as-gained samples were mostly block-shaped and grain sizes distribute mainly in a range of 5~20 μm.
|Number of pages||5|
|Journal||Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology|
|Publication status||Published - 2012 Jul 1|
- Radioactive waste
- Waste forms
ASJC Scopus subject areas