Abstract
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 N2atmosphere by SHS equipment self-designed.The addition amount of simulated radionuclide was SrO 1%~8 %,Nd2O31%,CeO21%~3%in the air and SrO 1%~8 %,Nd2O31%,CeO21%~2%in N2atmosphere,respectively.The leaching experiments of waste forms prepared were conducted in synthetic sea water at 40 ℃ and 70 ℃.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 N2atmosphere increased gradually with extending immersion time,and it was higher at 70 ℃than 40 ℃.The leaching concentration of simulated nuclides was higher in waste forms prepared in N2atmosphere than in the air.
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