Study on Decontamination of Contaminated Soils by Magnetic Separation
Study on Decontamination of Contaminated Soils by Magnetic Separation
复制标题
磁选去污污染土壤的研究
DOI：
10.1109/tasc.2013.2286001
复制
发表时间：
2014
影响因子：
1.8
通讯作者：
S. Nishijima
中科院分区：
文献类型：
--
作者：
K. Sekiya;H. Kuwahara;Y. Yoshida;Susumu Igarashi;N. Nomura;F. Mishima;Y. Akiyama;S. Nishijima
本文研究了一种磁选净化土壤的新方法，以减少污染土壤的体积。该方法将顺磁性强Cs离子吸附的2:1型粘土矿物与弱Cs离子吸附的反磁性1:1型粘土矿物分离。此外，洗涤从1:1型解吸的Cs离子迁移到2:1型粘土矿物中。因此，可以减少1:1型粘土矿物的用量。首先，通过粒子轨迹模拟发现，蛭石是2:1型粘土矿物，利用超导磁体进行高梯度磁选可以选择性分离蛭石。其次，在模拟的基础上，通过实验确认了蛭石与高岭石共存的1:1型粘土矿物的分离。此外，利用实际污染土壤进行了实验，考察了Cs离子从1:1到2:1型粘土矿物的迁移。结果表明，当0.1 mol/L KI作为洗涤液时，1:1型解吸的Cs离子可以吸附到2:1型粘土矿物上。结果表明，1:1型粘土矿物的用量有降低的可能。
In this paper, we examined a new method for decontamination of soils by magnetic separation to reduce the volume of contaminated soils. In this method, we separate paramagnetic 2:1 type clay minerals with strong adsorbility of Cs ions from diamagnetic 1:1 type clay minerals with weak adsorbility of Cs ions. In addition, Cs ions desorbed from 1:1 types by washing are migrated to 2:1 type clay minerals. As a result, the doses of 1:1 type clay minerals can be reduced. First, it became apparent by the particle trajectory simulation that vermiculite, which is 2:1 type clay mineral, could be selectively separated by high gradient magnetic separation using superconducting magnet. Second, we confirmed the separation of vermiculite coexisting with kaolinite, which is 1:1 type clay mineral, by the experiments based on the simulation. Moreover, the experiments using the actual contaminated soils were conducted to examine the migration of Cs ions from 1:1 to 2:1 type clay minerals. As a result, it was observed that Cs ions desorbed from 1:1 types could be adsorbed to 2:1 type clay minerals when using 0.1 mol/L KI as wash solution. It showed the possibility of decreasing the dose of 1:1 type clay minerals.