辐射防护2011，Vol.31Issue(2)：76-82,99,8.
模拟高放玻璃固化体在低氧地下水中的长期蚀变行为研究
Study on Long- term Alteration Behavior of the Simulated HLW Glass in the Low-oxygen Underground Water
甘学英 1张振涛 1苑文仪 2王雷 1邢海青 1白杨 1马辉1
作者信息
- 1. 中国原子能科学研究院放射化学研究所,北京102413
- 2. 清华大学环境科学与工程系,北京100084
- 折叠
摘要
Abstract
The long- term alteration behavior of HLW glasses is very important in the safety assessment of the deep geological repository. In order to predict the behavior under normal conditions, which is difficult to be obtained within a relative short period for the slow reaction between the glasses and aqueous medias, the static leaching method (PCT) was employed to accelerate the corrosion evolution of the glass with S/V=6 000 m-1 at 150 ℃. SEM-EDS and XRD, respectively, were used for the analysis of the glass surface micro-morphological characterization and the secondary minerals produced by the alteration of the glass, and ICP-AES for the concentration determination of the elements in the leaching solution. In our experiments, the aluminosilicates and phyllosolicates with honeycomb structure rich in Mg and Fe were found to form on the simulated HLW glass surface when it was subjected to a long- term leaching in the high brine groundwater. The major secondary minerals are nontronite ( Na0.3Fe2Si4O10 ( OH )2· 4H2O ), montmorillonite ( Ca0.2 ( Al, Mg )2Si4O10 ( OH )2 · 4H20 ), mordenite ( ( Na2, K2,Ca)Al2Si10O24 · 7H2O ) ) and clinoptilolite ( (Na,K,Ca)5Al6Si30O72 · 18H20 ). As further dissolution of the glass, both B and Na in the glass were found to leach out as borax form. Appearance of the phyllosilicates resumes the dissolution rate of the simulated HLW glass. The maximum renewal rate is increased by about 4 times the stable rate.关键词
玻璃固化体/长期蚀变行为/二次矿相/蚀变速率Key words
HLW Glass/ Long- term Alteration Behavior/ Secondary Minerals/ Alteration Rate分类
能源科技引用本文复制引用
甘学英,张振涛,苑文仪,王雷,邢海青,白杨,马辉..模拟高放玻璃固化体在低氧地下水中的长期蚀变行为研究[J].辐射防护,2011,31(2):76-82,99,8.
