摘要
随着核工业的发展、伴生放射性矿开发利用和核技术的广泛应用,国内存在一定数量的放射性污染场地,当前主流的放射污染场地修复技术为原位物理覆土法,这种方法存在一定的问题,如需要大量土方,导致场区周边的生态环境受到一定程度影响,且经济效益较差。本研究主要是探寻典型黏土对当地红壤的改良,选择具有代表性的黏土——膨润土、凹凸棒石,并按不同配比加入红壤中,研究对比不同覆盖厚度土层的阻隔治理效果,主要评价指标为土壤氡析出率,为未来放射性污染场地的修复工作提供借鉴。研究表明:添加了改良黏土的覆盖土层的降氡效果要优于原始红壤,添加比例相同的条件下,膨润土的降氡效果比凹凸棒石更好;检测添加不同配比(2%、4%、6%、8%、10%,质量分数)黏土的改良土壤覆盖的氡析出率,数据显示对于同一种改良黏土矿物材料,降氡效果随着其添加比例增大而更好。两种覆盖材料均在添加比例为6%时降氡效果最佳,表明膨润土及凹凸棒石作为改良覆盖土层的添加比例为6%为宜。
With the development of the nuclear industry,the exploitation and utilization of associated radioactive mines and the wide application of nuclear technology,there are a certain number of radioactive contaminated sites in China.Currently,the mainstream remediation technology for radioactive contaminated sites is in⁃situ physical covering method,which has certain problems:it requires a large amount of earthwork,resulting in a certain degree of impact on the ecological environment around the site and poor economic benefits.This study is mainly to explore the improvement of typical clay and local red soil.By adding clay with different ratios,the red soil is improved.Representative clay bentonite and attapulgite are selected to be added into the red soil with different ratios.It provides reference for the remediation of radioactive contaminated sites in the future.The results show that the radon reduction effect of the mulching soil with modified clay is better than that of the original red soil,and the radon reduction effect of bentonite is better than that of attapulgite under the same proportion.The radon exhalation rate of modified soil mulching was tested by adding different proportions of clay(2%,4%,6%,8%,10%).The data showed that for the same modified clay mineral material,the radon reduction effect increased with the increase of the added proportion.The radon reduction effect of the two mulching materials is most obvious when the addition ratio of 6%.It is suggested that the addition ratio of bentonite and attapulgite as the improved mulching soil layer should be 6%.
作者
张麟熹
王红海
邹融
魏信祥
谢冬香
王靖雯
ZHANG Linxi;WANG Honghai;ZOU Rong;WEI Xinxiang;XIE Dongxiang;WANG Jingwen(Test and Research Center of Jiangxi Nuclear Industry Geological Bureau,Nanchang 330000,China;School of Chemistry and Materials,East China University of Technology,Nanchang 330013,China)
出处
《材料导报》
CSCD
北大核心
2023年第S02期260-263,共4页
Materials Reports
基金
江西省主要学科学术和技术带头人培养计划——领军人才项目(20204BCJ22019)。
关键词
放射性
污染场地
膨润土
凹凸棒石
原位修复
radioactivity
contaminated sites
bentonite
attapulgite
in situ remediation
