用于分离酸性废液中铯的连续性循环系统

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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[Co₉-POM],通过SEM、XRD等方法对其进行了表征,并评价Na[Co₉-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[Co₉-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。

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	吕惠芸
	赵景宇
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	那平

关键词：铯电渗析高酸分离多金属氧酸盐

Abstract： 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[Co₉-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[Co₉-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.

Keywords： cesium electrodialysis high acid separation polyoxmetalate

Received 2021-03-31;

Fund:国家自然科学基金(2015BL-0008)。

Corresponding Authors: 那平,教授,E-mail:naping@tju.edu.cn。 Email: naping@tju.edu.cn

About author: 吕惠芸(1995-),女,硕士研究生,现从事环境水化学及核燃料循环与材料方面的研究。

引用本文:

吕惠芸, 赵景宇, 焦晗, 那平.用于分离酸性废液中铯的连续性循环系统[J]. 化学工业与工程, 2022,39(4): 39-49

LYU Huiyun, ZHAO Jingyu, JIAO Han, NA Ping.Continuous circulation system for cesium separation in acid waste liquid[J]. Chemcial Industry and Engineering, 2022,39(4): 39-49

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