Improvement of Cs leaching resistance of solidified radwastes with copper ferrocyanide (CFC)-vermiculite
Improvement of Cs leaching resistance of solidified radwastes with copper ferrocyanide (CFC)-vermiculite
复制标题
DOI：
10.1016/s0956-053x(99)00133-6
复制
发表时间：
1999-07
期刊：
影响因子：
8.1
通讯作者：
Ching-Tsven Huang;Gaoqiang Wu
中科院分区：
文献类型：
--
作者：
Ching-Tsven Huang;Gaoqiang Wu
研究了用亚铁氰化铜（CFC）和硅胶、膨润土、蛭石、沸石等多孔介质作为吸附剂对去离子水、海水和石灰水中铯的去除效果；将氯氟烃与蛭石掺入制备复合吸附剂，以提高固化硼酸盐废物的抗cs浸出性能。结果表明，CFC对铯的去除效率（即溶液中铯的去除或吸附率）受溶液ph值的影响较大。ph值在3 ~ 12范围内去除效果较好，ph值在7 ~ 10范围内效果最好。结果表明，蛭石和沸石的去除率优于硅胶和膨润土，由于蛭石与CFC絮团的相容性好，选择蛭石与CFC共混制备复合吸附剂。采用不同CFC含量的复合吸附剂作为添加剂，对放射性硼酸盐废弃物进行固化处理，提高固化产物的抗铯浸出性能。实验结果表明，添加0.25%含20% CFC和80%蛭石的复合吸附剂后，采用ANSI/ANS 16.1方法测得的铯浸出率指数由7.96提高到9.76。结果表明，该复合吸附剂对提高硼酸盐固化废物的抗铯浸出性能非常有用。
Cesium removal from de-ionized water, seawater, and limewater using copper ferrocyanide (CFC) and porous media including silica gel, bentonite, vermiculite, and zeolite as adsorbents were investigated; CFC was incorporated with vermiculite to prepare a compound adsorbent for improving the Cs-leaching resistance of solidified borate radwastes. It was shown that the Cs-removal efficiency by CFC, defined as the percentage of cesium removed or adsorpted from solution, was largely affected by pHs of the solutions. Good removal efficiency occurred at pHs ranging from 3 to 12 with the best from 7 to 10. Vermiculite and zeolite were shown to have better removal power than silica gel and bentonite, and vermiculite was chosen to incorporate with CFC to make compound adsorbents because of its good compatibility with CFC floc. Compound adsorbents with different CFC contents were used as additives in the solidification of radioactive borate wastes for improving the cesium leaching resistance of the solidified products. Experimental results showed that the cesium leachability index measured following the method described in ANSI/ANS 16.1 increased from 7.96 to 9.76 by adding 0.25% of a compound adsorbent containing 20% CFC and 80% vermiculite. It indicated that the compound adsorbent is very useful for improving cesium-leaching resistance of the solidified borate wastes.