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http://dx.doi.org/10.9727/jmsk.2014.27.4.293

Characteristics for the Copper Exchange Reaction by Bentonite Buffer  

Lee, Seung Yeop (Korea Atomic Energy Research Institute)
Lee, Ji Young (Korea Atomic Energy Research Institute)
Jeong, Jongtae (Korea Atomic Energy Research Institute)
Kim, Kyungsu (Korea Atomic Energy Research Institute)
Publication Information
Journal of the Mineralogical Society of Korea / v.27, no.4, 2014 , pp. 293-299 More about this Journal
Abstract
The bentonite, a buffer material, is essential for the deep geological disposal of HLW (high-level radioactive waste), and it is important to know its characteristic long-term evolution in the underground environment. With an assumption that the concentration of aqueous copper ions will increase if copper-coated materials on a metal canister are corroded, we examined some characteristic ion-exchanges and cation release phenomena occurring in the bentonite clay (montmorillonite) interacted with aqueous Cu cations. During the interaction between dissolved copper and bentonite, Na rather than Ca cations in the expandable clay were preferentially replaced by Cu ions in the experiment. In addition, the Cu-exchanged montmorillonite was characterized by an asymmetric X-ray diffracted pattern with relatively collapsed interlayers compared to the raw sample. These results indicate that the gradual change of the original bentonite property may occur in a underground disposal condition. We are going to further study the characteristic chemical and mineralogical changes of the bentonite buffer to be used for the disposal site by conducting additional experiments.
Keywords
high-level radioactive waste; bentonite; copper ion; montmorillonite; ion-exchange;
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Times Cited By KSCI : 9  (Citation Analysis)
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