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对高放玻璃固化体在地质处置过程中由于地下水的侵蚀而导致玻璃体溶解的溶解机理进行了分析,利用水解反应动力学模型对不同温度、不同p H条件下的玻璃固化体溶解速率进行了计算。计算结果表明:玻璃在酸性或高温情况下溶解速率较大,60℃、p H值6时平均溶解速率在0.35 g/a左右,120℃、p H值8.5时平均溶解速率在0.8 g/a左右;在100万年这个时间尺度上,120℃、p H值8.5时玻璃的最大溶解量是80%。考虑到地下处置库中温度一般要低于60℃,地下水的p H值范围在6~10,所以最保守估计100万年玻璃固化体的溶解侵蚀分数不大于50%。
The dissolution mechanism of vitreous dissolution caused by the erosion of groundwater in the process of geological disposal of high-content glass solidification body was analyzed. The dissolution rate of glass solidified body under different temperature and different p H conditions was calculated by the hydrolysis kinetic model . The results show that the dissolution rate of glass is higher at acidic or high temperature, the average dissolution rate of glass is about 0.35 g / a at 60 ℃ and pH 6, and the average dissolution rate is 0.8 g / a at 120 ℃ and 8.5, ; At a time scale of 1 million years, the maximum dissolved amount of glass is 80% at 120 ° C and a p H value of 8.5. Considering that the temperature in the underground repository is generally lower than 60 ° C and the p H value of groundwater ranges from 6 to 10, the most conservative estimate of the dissolved erosion fraction of 1 million years of glass cured body is not more than 50%.