硅灰对硅酸盐水泥滞留铀(Ⅵ)性能的影响

Silica Fume Effect on Retention Characteristics of Portland Cement for Uranium(Ⅵ)

在25℃下,通过浸出试验,用模拟地下水浸出42 d,比较不同硅灰掺量时硅酸盐水泥固化体对铀的滞留能力。结果表明随硅灰掺量的增加,水泥固化体对铀的滞留能力也在增加;硅灰掺量为15%时,水泥固化体的扩散系数为7×10-3cm3.d-1,仅为不掺硅灰时的5.5%。

With simulated groundwater as leachant, the retention capabilities of the portland cement ,which contains different amount of silica fume, are investigated under 25℃ and 42 days . The results indicate that silica fume can improve the retention capabilities of portland cement for uranium. When the cement contains 15% silica fume, the diffusion coefficient is 7×10^-3^cm^3·d^-1. It is only 5. 5% of the cement without containing fume.