超临界CO2流体萃取U（Ⅵ）实验研究  

Study on U（Ⅵ） extraction by supercritical CO2 fluid

作　　者：张博雅 周涛[1,2,3] 李晟 ZHANG Boya;ZHOU Tao;LI Sheng(School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, China;Institute of Nuclear Thermal-hydraulic Safety and Standardization, North China Electric Power University, Beijing 102206, China;Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy, North China Electric Power University, Beijing 102206, China;School of Nuclear Science and Technology, University of South China, Hengyang 421001, China)

机构地区：[1]华北电力大学核科学与工程学院,北京102206 [2]华北电力大学核热工安全与标准化研究所,北京102206 [3]非能动核能安全技术北京市重点实验室,北京102206 [4]南华大学核科学技术学院,湖南衡阳421001

出　　处：《应用科技》2019年第5期73-75,79,共4页Applied Science and Technology

基　　金：国家重点研发计划项目（2016YFC1402500）;北京市自然科学基金项目（3172032）;中国原子能科学研究院项目（2017-434）

摘　　要：为探究温度、压力、络合剂用量、萃取时间对铀萃取率的影响,探寻最佳萃取值,将标准铀溶液滴加在滤纸上模拟固态铀萃取。用磷酸三丁酯(TBP)-HNO3做络合剂,超临界CO2(scCO2)做萃取剂,进行实验。结果显示:萃取率随着络合剂的增多而增加,达到一定用量时再增加络合剂,萃取率提升较缓慢,最佳取TBP/铀摩尔比70;萃取率随温度升高先上升后下降,在60℃时达到最大值;萃取率随压力增加而增加,压力达到20MPa后萃取率上升缓慢,最佳萃取压力为20MPa;萃取率随着萃取时间的延长增高,萃取150min之后,萃取率基本不变,一般萃取120min即可。In order to investigate the influence of different physical factors such as temperature, pressure, dosage of complexing agent and extraction time on the extraction rate of uranium by supercritical extraction, the standard uranium solution was added dropwise to the filter paper to simulate the extraction of solid uranium. TBP-HNO3 was used as complexing agent and supercritical CO2 was used as extracting agent to simulate solid uranium extraction. The results showed that the extraction rate increased with the increase of complexing agent;When reaching a certain dosage, add the complexing agent, and the extraction rate was slowly increased;The optimum molar ratio of TBP to uranium was 70;The extraction rate first rose and then decreased with the increase of temperature, reaching the maximum at 60℃;The extraction rate increased with the increase of pressure, and increased slowly after the pressure reached 20 MPa, and the optimal extraction pressure was 20 MPa;The extraction rate increased with the extension of extraction time, and after 150 min of extraction, the extraction rate was basically unchanged, generally 120 min was enough.

关 键 词：超临界CO2 TBP-HNO3 铀(Ⅵ) 萃取 络合剂 后处理 乏燃料 溶解度 

分 类 号：TL99[核科学技术—核技术及应用]