【作者】 张靖； 邓大超； 王怀胜； 廖俊生；

【Author】 Jing Zhang;Dachao Deng;Huaisheng Wang;Junsheng Liao;China Academy of Engineering Phsics,p.o.box 919-71, mianyang 621900, sichuan, china;

【机构】 中国工程物理研究院；

【摘要】 硝酸铀酰和磷酸三丁酯(TBP)煤油溶剂萃取体系,广泛用于铀分析和乏燃料后处理过程。传统的手工萃取剧烈振荡过程容易出现乳化,后期相分离困难,并且该萃取方式消耗大量的有机试剂,产生较多的放射性废液。微流控技术所采用的微通道尺寸仅数百微米,通道内具有较大的比表面积和较小的扩散距离,能减少样品用量、放射性废物产生、工作人员辐射剂量等,在放射性领域可以有广泛的应用。本课题组采用玻璃微芯片开展研究工作,通过对双Y型微通道出口选择性修饰,使通道内并行层流的硝酸铀酰水相和TBP-氢化煤油有机相在出口处自动分相,结合实验和理论计算开展了微芯片内铀萃取的初步研究,考察了不同因素对萃取过程的影响。接下来将进一步优化进样、芯片结构设计、萃取溶液条件、相分离方式以及与检测装置的联用,从而实现在线分离分析。更多还原

【Abstract】 Tributylphosphate(TBP)- kerosene is widely used to extract uranyl from aqueous, no matter in uranium analysis or nuclear fuel cycle. However the extraction process has a problem of phase separation, because of severe shaking which results in emulsification. Moreover, the process consumes a lot of organic reagents and generates large amount of radioactive wastes. Because microchannel has micron size, the channel has high interface-to-volume ratio and short transition distance, which can reduce the consumption of reagents, time of mass transfer and accelerate the process of analysis. Application of microfluidic in radioactive extraction process could provide significant improvements, by shortening analysis time, generating less waste in safeguards and minimizing radiation exposure for analytical personnel. Our work focused on the extraction of uranium in "double Y" microchannel, which has been partly modified to hydrophobic for phase separation.更多还原