碱矿渣水泥固化模拟高放废液的研究

STUDY ON THE IMMOBILIZATION OF SIMULATED HIGH-LEVEL RADIOACTIVE WASTE BY ALKALI-ACTIVATED SLAG CEMENT

研究了用碱矿渣水泥固化模拟高放废液。结果表明,碱矿渣水泥在抗压强度、孔结构、Cs离子浸出性能及热稳定性等方面均优于硅酸盐水泥和高铝水泥。以碱矿渣水泥为基体,掺入适量沸石和硅灰,采用特殊工艺,在废物包容量小于25％时。固化体抗压强度65-100MPa,孔隙率小于10％,核素Cs和Sr离子浸出率仅为10^(-5)和10^(-6)g·cm^(-2)·d^(-1)的水平,与现有玻璃固化体性能相近。另外还探讨了核素离子在碱矿渣水泥固化体中的固化机理。

In a study on the use of Alkali-Activated Slag Cement (AASC) as a matrix for the immobilization of simulated China's High-Level Radioactive Waste (HLW), the experimental results show that compressive strength, pore structure, leachability of Cs and resistance to the heat of AASC are better than those of Ordinary Portland Cement(OPC) and High Aluminate Cement (HAC). When simulated HLW loading is less than 25 wt％ AASC based waste-forms containing suitable zeolite and condensed silica fume, processed by a special technology, exhibit higher compressive strength of 65-100MPa lower porosity of less than 10％ and leachabilities of 10^(-5) and 10^(-6)g/cm^2·d for Cs and Sr respectively and these properties are comparable With those of glass. The mechanism of the immobilization of nuclides in AASC based waste-form is also studied.