Thermal properties of simulated high level liquid waste glass solids
Glass solidification technology is currently the main method for solidification and disposal of HLW(high-level radioactive waste)both domestically and internationally.High level radioactive waste contains lanthanum and uranium,but the impact of lanthanum and uranium on the solidification process has not been reported.In order to compare the effects of lanthanum and uranium on the melting process and product properties of the glass solidified body,and analyze the differences in various aspects under different lanthanum uranium ratios,borosilicate glass solidified bodies simulated from high-level radioactive waste were used as experimental materials,and characterization methods such as XRD(X-ray diffraction)and SEM(scanning electron microscopy)were used to study the crystallization behavior and thermal stability of glass solidified bodies at different heat treatment temperatures.The results show that there is little difference in the appearance of samples with different lanthanum/uranium ratios at 800,900,1 000 ℃.Heat treatment experiments confirm that the solidified samples have crystal precipitation within the temperature range of 800-900 ℃.The crystallization is most severe within the temperature range of 800 ℃ heat treatment.
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