【摘要】 对Cs⁺和Sr²⁺在碱矿渣水泥固化体中的吸附和固溶机理进行了定量研究。结果表明,掺有沸石和硅灰的碱矿渣水泥硬化体具有较强的吸附Cs⁺和Sr²⁺能力以及抗Cs⁺和Sr²⁺脱附能力。XRD分析表明,Cs⁺和Sr²⁺通过替代C—S—H中的Ca²⁺而被固溶入C—S—H晶格。C—S—H的d₁₁₁值随CsNO₃和Sr（NO₃）₂掺入量的增加呈限量台阶状增大。SEM/EDS分析表明,试样经去离子水超声波清洗后仍能探测到大量的Cs⁺和Sr²⁺存在,这表明碱矿渣水泥水化产物具有较强的持留Cs⁺和Sr²⁺能力。更多还原

【Abstract】 The mechanisms of adsorption and chemical immobilization in Alkali-Activated Slag Cement (AASC) waste forms were quantitatively studied for Cs+ and Sr2+. Experimental results show that, hardened AASC paste with zeolite and silica fume possesses strong adsorption ability and anti-desorption ability for Cs+and Sr2+. The results analyzed by XRD show that Cs+and Sr2+ could be incorporated into the lattice of C-S-H by replacing Ca2+ in C-S-H. The d111 values of C-S-H increase with increasing CsNO3 and Sr(NO3)2 dosages in a limited and regular step. After washed out by deionized water in a ultrasonic washer, samples were analyzed by SEM/EDS and a lot of Cs+and Sr2+ were detected. This means that the hydration products of AASC have a high retaining ability for Cs+and Sr2+.更多还原