Structure and Leaching Resistance of Ba(NO3)2-Pretreated High-Level Liquid Glass Waste Form
In order to increase solubility of sulfur in borosilicate glass,SO4 ions in simulated high-level liquid waste(HLLW)with relatively high content of sulfur and sodium were pretreated by adding Ba(NO3)2 solution,and then borosilicate glass waste form was prepared by melt-quenching method.The effects of pretreated HLLW on the structure and leaching resistance were mainly investigated.The results show that the waste loading can be increased to 23％(mass fraction)without phase separation after the Ba(NO3)2 pretreatment.The normalized elemental mass loss of Na,B and Si of the HLLW-loaded samples are one order of magnitude lower than that of the pure borosilicate glass.Furthermore,the leaching resistance of the glass waste form has no significant change with increasing HLLW content.11B and 29 Si MAS NMR analyses indicate that part of BO3 transforms into BO4 structural units and a polymerization of the glass network occurs after HLLW addition.
high-level liquid wasteborosilicate glassbarium nitratesulfatenuclear magnetic resonanceleaching resistance
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