膨润土与水相互作用初步研究

辐射防护 ›› 2018, Vol. 38 ›› Issue (4): 331-335.

膨润土与水相互作用初步研究

刘伟, 梁栋, 李洪辉, 贾梅兰, 赵帅维, 毛亮, 杨仲田

中国辐射防护研究院,中核高放废物地质处置评价技术重点实验室,太原 030006

收稿日期:2017-12-10 出版日期:2018-07-20 发布日期:2020-07-28
作者简介:刘伟(1986—),男,2012年毕业于兰州大学核科学与技术学院核能与核技术工程专业,助理研究员。E-mail:fflglw@126.com

Preliminary study on interaction of bentonite and water

LIU Wei, LIANG Dong, LI Honghui, JIA Meilan, ZHAO Shuaiwei, MAO Liang, YANG Zhontian

China Institute for Radiation Protection, CNNC Key Laboratory on Geological Disposal ofHigh-level Radioactive Waste, Taiyuan 030006

Received:2017-12-10 Online:2018-07-20 Published:2020-07-28

摘要/Abstract

摘要： 为研究膨润土与水作用后对高放废物地质处置安全性产生的影响,将不同蒙脱石含量的临安钠基膨润土和兴和钙基膨润土置于水中长期浸泡3 000 h。结果表明:二种膨润土的膨胀指数皆随着蒙脱石含量的增加而增加,且最大膨胀指数与蒙脱石含量间的对数值呈线性关系;膨胀平衡后上清液中一价阳离子浓度大于二价阳离子的浓度,且随着蒙脱石含量的增加而增加,数据表明Na⁺浓度与膨润土中蒙脱石含量的对数值呈线性关系;上清液烘干后残留物质量随蒙脱石含量增加而增加,XRD图谱表明其中已存在蒙脱石。这些结果可作为进一步开展地质处置中缓冲材料与地下水相互作用的研究基础。

关键词: 膨润土, 膨胀指数, 水化学, 离子浓度, 胶体

Abstract: In order to study the interaction influence of bentonite and water on safety of geological disposal for high-level radioactive waste, two bentonites of different montmorillonite contents were immersed in water for 3 000 hours. Test results showed that their swell indexes increased with the increase of montmorillonite content, and a linear relationship was observed between the biggest swell index and logarithm of montmorillonite content. After swelling reached equilibrium, the concentration of univalent cation was larger than the concentration of divalent cation in supernatant and it increased with the increase of montmorillonite content; and there was also a linear relationship between sodium concentration and logarithm of montmorillonite content in two bentonites. The amount of dried residue of the supernatant also increased with the increase of montmorillonite content, and the XRD test results indicated that montmorillonite was present in dried residue of liquid supernatant. These experimental results can be a basis for further studies on interaction of buffer material and groundwater in geological disposal.

Key words: bentonite, swell index, water chemistry, ionic concentration, colloid

中图分类号:

O644.2

刘伟, 梁栋, 李洪辉, 贾梅兰, 赵帅维, 毛亮, 杨仲田. 膨润土与水相互作用初步研究[J]. 辐射防护, 2018, 38(4): 331-335.

LIU Wei, LIANG Dong, LI Honghui, JIA Meilan, ZHAO Shuaiwei, MAO Liang, YANG Zhontian. Preliminary study on interaction of bentonite and water[J]. RADIATION PROTECTION, 2018, 38(4): 331-335.

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