温度对模拟高放玻璃固化体显微结构和抗浸出性能的影响

Effect of Temperature on Microstructure and Leaching Resistance of Simulated High Level Liquid Waste Glass

以模拟北山地下水为浸泡剂,采用静态浸出试验法(MCC-1),研究了温度(40~150℃)对模拟高放废液硼硅酸盐玻璃固化体显微结构和抗浸出性能的影响。结果表明:玻璃固化体浸泡42 d后,在90℃及以上温度出现了蜂窝状的页硅酸盐和铝硅酸盐矿物,在150℃还新生成了白色板状BaSO 4晶体;Si、B、Cs和U元素的归一化浸出率(LR)在28 d后趋于平稳,且随着温度升高浸出率逐渐升高;基于B元素浸出速率的表观活化能约为27.8 kJ/mol;玻璃固化体在90℃模拟地下水浸泡28 d后的LR_(Si)、LR_(B)、LR_(Cs)、LR_(U)分别为1.45×10^(-1)、1.39×10^(-1)、2.48×10^(-1)、1.3×10^(-1)g/(m^(2)·d)。

The effects of temperature(40~150℃)on the microstructure and leaching resistance of simulated high-level liquid waste borosilicate glass were studied by static leaching test MCC-1 using simulated Beishan groundwater as leaching media.The results show that after soaking 42 days,honeycomb-like phyllosilicate and aluminosilicate minerals are observed on the surface of glass when the temperature is higher than 90℃.In addition,some white plate-like BaSO_(4)crystals appear when the temperature increases to 150℃.The normalized elemental leach rates(LR)of Si,B,Cs,and U tend to be stable after 28 days and increase gradually with increasing temperature.The apparent activation energy based on the elemental leach rate of B is about 27.8 kJ/mol.After 28 days,the LR_(Si)、LR_(B)、LR_(Cs),and LR_(U)of the waste glass in simulated groundwater at 90℃are 1.45×10^(-1),1.39×10^(-1),2.48×10^(-1)and 1.3×10^(-1)g/(m^(2)·d),respectively.