两种辐射作用对改性钠基膨润土性能影响的研究

Study on influence of two irradiation on performance of modified Na-bentonite

为了研究辐射作用对膨润土性能的影响,以改性钠基膨润土为研究对象。采用电子加速器和钴源在室温下进行辐照,并对老化样品进行了测试。结果表明,在累积受照剂量为5MGy,电子辐照、γ辐照作用条件下,改性钠基膨润土的阳离子交换容量分别为77.36meq/100g、77.89meq/100g,分别比未辐照的改性钠基膨润土下降了3.7%和3.0%;自由膨胀体积分别为20.4mL、20.8mL,分别比未辐照的改性钠基膨润土下降了11.3%和9.6%。电子辐照和γ辐照作用后,导致改性钠基膨润土的阳离子交换能力下降,吸水能力减弱,自由膨胀能力下降。

In order to investigate the influence of irradiation on performance of bentonite,taking the modified Na-bentonite as object.The samples were irradiated by electron and gamma irradiation at room temperature,and then the ageing samples were tested.The results showed that:when the cumulative dose was up to 5 MGy for electron andγirradiation,the cation exchange capacities were 77.36 meq/100 g and 77.89 meq/100 g,which decreased by 3.7%and3.0%from unirradiated modified Na-bentonite respectively.The free expansion volumes were 20.4 mL and 20.8 mL,which decreased by 11.3%and 9.6%from unirradiated modified Na-bentonite.After electron and gamma irradiation,the cationic exchange ability of samples was reduced,the water absorption ability was weakened,and the free expansion ability was reduced.