粉煤灰基沸石固化体中Sr^(2+)、Cs^+的浸出行为  

Leaching Behavior of Sr^(2+),Cs^+ in Synthesized Zeolite From Fly Ash-Solidified Waste Forms

作　　者：罗洁[1,2,3] 廖蓉[2] 王亚举[2] 张海军[1,4] 杨剑[5] 黄胜[2] 

机构地区：[1]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010 [2]西南科技大学环境工程自控技术四川省高校重点实验室,四川绵阳621010 [3]四川省工业环境监测研究院,四川成都610000 [4]西南科技大学理学院,四川绵阳621010 [5]西南科技大学应用技术学院,四川绵阳621010

出　　处：《核化学与放射化学》2017年第1期95-102,共8页Journal of Nuclear and Radiochemistry

基　　金：西南科技大学博士科研基金资助项目(11zx7112);西南科技大学研究生创新基金资助项目(15ycx41)

摘　　要：以电厂粉煤灰为原料水热制备粉煤灰基沸石,利用粉煤灰基沸石对模拟放射性废液中Sr^(2+)、Cs^+进行分离富集,在碱激发剂的作用下,以粉煤灰、粉煤灰基沸石制备地聚合物固化体,测试了所得固化体的抗压强度和抗浸出性能,并采用X射线衍射法(XRD)和扫描电镜(SEM)技术对浸出机理进行了初步探讨。结果表明,不同沸石掺量对固化体的抗压强度和抗浸出性能有很大的影响,当沸石掺量(质量分数)为20%~30%时,其抗压性能达到国家标准,浸出率和累积浸出分数均远低于国家标准限值。同时,固化体对Sr^(2+)、Cs^+阻滞效果不同,其中对Sr^(2+)的固化效果更加优异,42d浸出率最低为1.87×10^(-6)cm/d,累积浸出分数为3.3×10^(-4)cm。实验得出,粉煤灰基沸石固化体对Sr^(2+)、Cs^+具有较优异的固化效果。Synthetic zeolite was prepared by hydrothermal method using fly ash from power plant as raw material.Cs^＋ and Sr^2＋ were isolated and enriched by synthetic zeolite from the radioactive waste liquid.Then,geopolymer was made with fly ash and synthetic zeolite,using sodium silicateas activator.Finally,the physical properties and the leaching resistance of the solidified body were tested,and the leaching mechanism was preliminarily discussed by XRD and SEM technology.The results show that the compressive strength and the leaching resistance of the solidified body is significantly affected by the zeolite dosage.When the dosage is 20%-30%（mass fraction）,the compressive properties reach the national standard,and the leaching rate and the accumulated leaching fraction are far lower than the national standard limits.According to the data,the curing effect of Sr^2＋ and Cs^＋ in the solidified body is different,and the curing effect of Sr^2＋ is more excellent.The leaching rate of 42 dis 1.87×10^-6 cm/d,and the leaching fraction is 3.3×10^-4 cm.The experimental reveal that the Sr^2＋ and Cs＋of synthesized zeolite from fly ash have excellent curing effect.

关 键 词：粉煤灰 沸石 固化 抗压强度 浸出率 

分 类 号：X703[环境科学与工程—环境工程]