超临界水氧化处理放射性废TBP/煤油技术研究  

Study on Radioactive TBP/kerosene Treatment by Super Critical Water Oxidation

作　　者：李腾 包良进[1] 鲜亮[1] 郑佐西[1] 王玲钰 华小辉[1] 张鹏 LI Teng;BAO Liangjin;XIAN Liang;ZHENG Zuoxi;WANG Lingyu;HUA Xiaohui;ZHANG Peng(Department of Radiochemistry,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《原子能科学技术》2021年第4期594-602,共9页Atomic Energy Science and Technology

摘　　要：针对乏燃料后处理常用的有机溶剂TBP/煤油,采用以质量分数为30%的双氧水为氧化剂的超临界水氧化(SCWO)处理装置进行了模拟实验。结果显示,反应温度(550±50)℃、停留时间(9±1)min、氧化剂与有机物流量比16.5±0.5条件下,有机物无机化率可达到99.9%以上。在此基础上开展了SCWO处理工艺放射性实验研究。结果表明,在气相产物中,放射性低于检测下限;在液相产物中,α活度浓度为2.37×10^(3)Bq/L,β活度浓度为8.94×10^(2)Bq/L,γ活度浓度为96 Bq/L;在固相产物中,α比活度为2750.2 Bq/g,β比活度为5863.3 Bq/g,γ比活度为5840.2 Bq/g,根据放射性活度衡算,放射性核素大部分进入固体残渣中。SEM/EDS表征结果表明,反应过程产生的固体产物中,主要以U元素为主,产物中主要含U、Ni、Cr、Fe、Al的磷酸盐及氧化物。A supercritical water oxidation(SCWO)treatment device,with 30%hydrogen peroxide as oxidant,was used to dispose TBP/kerosene in reprocessing,and the simulation experiments were carried out.The results show that under the condition of reaction temperature(550±50)℃,residence time(9±1)min and the ratio of oxidant to organic flow 16.5±0.5,the inorganic rate of organic waste can reach over 99.9%.On this basis,the experimental study of radioactivity was carried out.The results show that no radioactivity is detected in the gas-phase products and theα,βandγactivity concentrations in liquid are 2.37×10^(3),8.94×10^(2)and 96 Bq/L respectively,and specific activities in solid products are 2750.2,5863.3 and 5840.2 Bq/g respectively.The radionuclide is concentrated in the solid products.SEM/EDS analysis shows that the main component of the solid products is U,other components are phosphates and oxides composed of U,Ni,Cr,Fe and Al.

关 键 词：超临界水氧化 后处理 TBP/煤油 

分 类 号：TL942[核科学技术—辐射防护及环境保护]