摘要
采用静态吸附实验和动态淋滤实验,研究了天然漂白土、钠基膨润土、高庙子膨润土、钙基膨润土四种膨润土对239Pu的吸附性能和迁移的阻滞性能。实验结果表明:钙基膨润土吸附能力最强,Kd高达7.808 2×104,高庙子膨润土次之,天然漂白土略低于高庙子土、钠基膨润土最弱,Kd为2.854 8×104。同时,钙基膨润土的渗水性能最强,渗透出的239Pu核素总量最多,淋出率为6.166‰。高庙子膨润土的渗水性能明显弱于天然漂白土,渗透出的239Pu核素总量也远远低于天然漂白土。吸附性能最弱的钠基膨润土的渗水性能最弱,核素的淋出率也最低,为0.107‰。综合考虑,高庙子膨润土和钠基膨润土对239Pu的阻滞性能更加优越,是处置库的回填材料的更好选择。
Adsorption abilities and retardation capability of natural bleaching earth, Na-bentonite, GMZ-ben- tonite and Ca-bentonite on 239Pu were studied by using static adsorption experiment and dynamic leaching experi- ments. The result shows that ： Ca-bentonite has a strongest adsorption abilitiy, with the value of Kd up to 7. 808 2 × 104, GMZ-bentonite ranks the second, natural bleaching earth ranks the third, Ca-bentonite is the weakest, with the value of Kd low to 2. 854 8 × 104. Meanwhile, Ca-bentonite has the strongest water permeability, and had penetra- ted out the maximum amount of 239pu, its leaching rate of 239pu in leachates is 6. 166 %0. the water permeability of GMZ-bentonite is weaker than the natural bleaching earth, and the total amount of 239pu in leachates are also lower. Na-bentonite shows a weakest water permeability, with the lowest leaching rate of 239pu which is 0. 107 ‰. Taken all these factors into consideration, GMZ-bentonite and Na-bentonite shows better retardation capability, they are the reasonable backfill material.
出处
《科学技术与工程》
北大核心
2014年第8期168-171,共4页
Science Technology and Engineering
基金
国家杰出青年科学基金资助项目(41025015)
四川省青年科技创新研究团队(2011JTD0013)资助
关键词
239Pu
膨润土
吸附性能
阻滞性能
239pu bentonite adsorption abilities retardation capability
