In order to study the SHS immobilization effect of the radioactive graphite, the exothermic reaction (3C + 4Al + 3TiO2 = 2Al2O3 + 3TiC + Q), in which Sr2+ was used to simulate 90SrO, and Nd3+, Ce4+ were used to simulate An3+, An4+, respectively, was introduced in the air and N2 atmosphere by SHS equipment self-designed. The addition amount of simulated radionuclide was SrO 1%~8 %, Nd2O3 1%, CeO2 1%~3% in the air and SrO 1%~8 %, Nd2O3 1%, CeO2 1%~2% in N2 atmosphere, respectively. The leaching experiments of waste forms prepared were conducted in synthetic sea water at 40°C and 70°C. X-ray diffractometer (XRD) and inductively coupled plasma source mass spectrometer were used to test and analyze the phase composition and leaching data of these samples. The anti-leaching properties were studied on the basis of a detailed research on the phase changes of waste forms within solid solution. The results indicated that leaching concentration of Sr2+, Nd3+, Ce4+ in waste forms prepared in both air and N2 atmosphere increased gradually with extending immersion time, and it was higher at 70°C than 40°C. The leaching concentration of simulated nuclides was higher in waste forms prepared in N2 atmosphere than in the air.
|Number of pages||8|
|Journal||Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology|
|Publication status||Published - 2014 Jun|
- Chemical stability
- Radioactive graphite
- Waste forms
ASJC Scopus subject areas