摘要
以001×7型阳树脂为研究对象,Sr(Ⅱ)为模拟元素,开展微波辅助芬顿试剂法降解研究,在1 h内阳树脂降解率达98.5%,实现了树脂的高效降解。对降解液体成分和核素分布分析表明:废液中无固体残余,主要为有机小分子,冷凝液中存在较低的核素,气体主要成分为O2,SO2,CO2,基本无Sr(Ⅱ)存在。针对降解液开展了水泥固化研究,评估了水泥固化体的抗压强度、抗冻融性及抗浸出性等理化性能。研究发现降解液的pH值对固化体性能影响较大,较低的COD值对水泥固化体的性能影响较小。经调节p H值后降解液水泥固化体养护28 d后抗压强度大于30 MPa,抗冻融性能良好,42 d浸出率和累计浸出分数分别为6.34×10^-3cm·d^-1和3.15×10^-2cm。
001×7 cation resin was used as the research object,and Sr(Ⅱ)was used to simulate the nuclide.The microwave-assisted Fenton reagent method was used to degrade the spent radioactive cation exchange resin.The degradation rate of the cation resin reached 98.5%within 1 hour,which achieved the efficient degradation of the resin.Analysis of the components of the degraded liquid and the distribution of nuclide showed that no solid residues in the waste liquid were mainly small organic molecules,lower nuclide existed in the condensate,and the main components of the gas were O2,SO2 and CO2.The cement solidification research was carried out on the degradation solution,and the physical and chemical properties of the compressive strength,freeze-thaw resistance,and leaching resistance of the cement solidified body were evaluated.The study shows that the pH value of the degradation solution has a greater impact on the performance of the solidified body,and a lower COD value has a less effect on the cemented body.With the pH value adjusted,the degraded cement solidified body shows a compressive strength greater than 30 MPa after being cured for 28 days,and the freeze-thaw resistance is good.The 42 d leaching rate and cumulative leaching score are 6.34×10^-3 cm·d^-1 and 3.15×10^-2 cm,respectively.
作者
李江博
王烈林
谢华
张文秀
丁芸
周美灵
刘艳
LI Jiangbo;WANG Lielin;XIE Hua;ZHANG Wenxiu;DING Yun;ZHOU Mieling;LIU Yan(National Defense Key Discipline Laboratory of Nuclear Waste and Environmental Security,Mianyang 621010,Sichuan,China;Institute of Materials Science,China Academy of Engineering Physics,Mianyang 621907,Sichuan,China)
出处
《西南科技大学学报》
CAS
2020年第2期15-20,共6页
Journal of Southwest University of Science and Technology
基金
四川省科技厅项目资助(2018jy0449)
四川省教育厅项目资助(17cz0037)
四川省科技厅苗子工程资助(2018129)。
关键词
微波
芬顿试剂
放射性废阳树脂
核素分布
水泥固化
Microwave
Fenton reagent
Spent radioactive cation exchange resin
Nuclide distribution
Cement solidification
