两种辐射作用对改性钠基膨润土性能影响的研究
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摘要
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.
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.
引文
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[3]Allard T,Calas G.Radiation effects on clay mineral properties[J].Applied Clay Science,2009,43:143-149.
[4]Ewing R C,Weber W J,Clinard F W.Radiation effects in nuclear waste forms for high-level radioactive waste[J].Progress in Nuclear Energy,1995,29(2):63-127.
[5]Weber W J,Ewing R C,Catlow C R A,et al.Radiation effects in crystalline ceramics for the immobilization of high-level nuclear waste and plutonium[J].Journal of Materials Research,1998,13(6):1434-1484.
[6]Meier Lorenz P,Kahr Guenter.Determination of the cation exchange capacity(CEC)of clay minerals using the complexes of copper(Ⅱ)ion with triethylenetetramine and tetraethylenepentamine[J].Clays and Clay Minerals,1999,47(3):386-388.
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