用于分离酸性废液中铯的连续性循环系统  

Continuous circulation system for cesium separation in acid waste liquid

作　　者：吕惠芸 赵景宇 焦晗 那平[1] LYU Huiyun;ZHAO Jingyu;JIAO Han;NA Ping(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学化工学院,天津300350

出　　处：《化学工业与工程》2022年第4期39-49,共11页Chemical Industry and Engineering

基　　金：国家自然科学基金(2015BL-0008)。

摘　　要：针对核工业回收U、Pu过程所产生的放射性废液中Cs^(+)的分离与富集,设计了连续电渗析富集分离技术(CEEST)。在不同温度下通过水热法合成一系列的多金属氧酸盐Na[Co_(9)-POM],通过SEM、XRD等方法对其进行了表征,并评价Na[Co_(9)-POM]材料的Cs^(+)分离性能。探究不同的恒定电流、溶液pH值和共存离子存在下对分离Cs^(+)过程的影响。实验结果表明,120℃下合成的材料Na[Co_(9)-POM]-120具有最佳的Cs^(+)分离和回收能力,在恒定电流为0.03 A且pH<1的高酸性环境中,Cs^(+)的分离率在150 min左右可达到96%以上。其共存离子对分离过程的影响较小,分离率仍可达到70%以上。为此提出了一种综合性连续循环的Cs^(+)分离系统,成功实现了高酸放射性废液中Cs^(+)的分离,并分析其在工业上的应用前景。Aiming at the separation and enrichment of Cs^(+)in the radioactive waste liquid produced by the process of recovering U and Pu in nuclear industry,a continuous electrodialysis enrichment and separation technology(CEEST)was designed.A series of Na[Co_(9)-POM]materials were synthesized by a hydrothermal method at different temperatures,meanwhile the materials were characterized by SEM,XRD and other methods.The products’Cs^(+)separation ability were evaluated.The effects of different constant current,pH of solution and the presence of coexisting ions on the Cs^(+)separation process were studied.The Na[Co_(9)-POM]-120 showed the best Cs^(+)separation and recovery ability.More than 96%of Cs^(+) could be separated and collected in highly acid condition(pH<1)under 0.03 A current in about 150 min.The presence of coexisting ions had little effect on the separation of the Cs^(+).Therefore,a comprehensive continuous circulation system for Cs^(+)separation was proposed,which successfully achieved the separation of the Cs^(+)in acid radioactive waste liquid and its application advantages in industry were analyzed.

关 键 词：铯 电渗析 高酸 分离 多金属氧酸盐 

分 类 号：TQ110.2[化学工程—无机化工]