高庙子钠基膨润土热老化后矿物成分变化
投稿时间:2019-06-09  修订日期:2020-03-19  点此下载全文
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梁 栋 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 londonliang@yeah.net 
中文摘要:为了了解 单纯热老化对高庙子天然钠基膨润土中矿物组分和微观结构的影响,拓展高放地质处置缓冲材料性能评价范围,以内蒙古高庙子天然钠基膨润土和北山地下水为研究对象,利用红外光谱仪、X射线衍射仪和穆斯堡尔谱仪分析了不同老化温度(90、150、170、190和210℃)和老化时间(2、4、6、8、10和12个月)热老化后高庙子天然钠基膨润土中官能团、矿物组分和Fe的赋存状态以及含量的变化,并对其Si在北山地下水中的溶解性进行的测试。结果表明:随着老化温度和老化时间的增加,膨润土中官能团数量有所变化,蒙脱石含量减少,云母和沸石含量增加,但没有发生种类变化;可溶性偏硅酸根增加,存在Fe(Ⅱ)向Fe(Ⅲ)转变的趋势。总体而言,热老化引起了高庙子天然钠基膨润土矿物组分的显著变化,但尚需深入研究。
中文关键词:热老化  天然钠基膨润土  矿物成分  高放废物  地质处置
 
The Alteration on the Mineral Composition of GMZ Sodium Bentonite after Thermal Aging
Abstract:The aim of this paper is to understand the impacts of thermal aging on the mineral composition and microstructure of Gaomiaozi natural sodium bentonite with Beishan groundwater and to broaden the assessment and scope of buffer materials for geological disposal of high-level radioactive waste (HLW). FTIR, XRD AND M?ssbauer spectra of GMZ sodium bentonite (contain groundwater from Beishan area) heated at 90℃,150℃,170℃,190℃ and 210℃ respectively continue 2 monthes, 4 monthes, 6monthes, 8 monthes, 10monthes and 12monthes have been studied. In addition, the solubility of silicon in groundwater from Beishan area have been tested. The results indicates that, the content of montmorillonite decreased, the content of mica and zeolite increased significantly with the increment of the thermal temperature and time. The concentration of SiO32- in groundwater increased obviously as the thermal temperature and time increased. There have the tendency that Fe(Ⅱ)transformed to Fe(Ⅲ)in the bentonite after thermal aged. But the types of mineral and functional groups remain the same. All in all, the mineral composition of GMZ natural sodium bentonite have been varied after thermal aged, further research is needed to comprehend specific sitiations.
keywords:thermal aging  sodium bentonite  mineral compositions  high-level radioactive waste  geological disposal
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