Effect of Sulfur Separation on the Formation of Yellow Phase during Vitrification of High-Level Liquid Waste Glass
To suppress the formation of the yellow phase during vitrification of high-level liquid waste(HLLW),Ba(NO3)2 was used to separate the SO42-from the simulated HLLW as BaSO4 precipitation,and then borosilicate waste glass was prepared by the traditional melting method.The effect of sulfur separation on the formation of yellow phase during vitrification was mainly investigated.The results show that for the sample with 20%simulated HLLW,the amount of yellow phase increases gradually with increasing temperature during vitrification process(800-1 000℃)without sulfur separation.After sulfur separation,no obvious yellow phase can be observed.The yellow phase is composed of Na2SO4,BaSO4,Na2MoO4,BaCrO4 and Na2CrO4 before sulfur separation,while the major phase of sample after sulfur separation is BaCrO4.Moreover,no obvious yellow phase is observed after sulfur separation for the waste glass with 28%content of simulated HLLW,which is higher than that of the sample(＜16%)without sulfur separation.
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