超临界流体具有传质速度快、溶解能力强等特点。在萃取金属样品时,只需添加少量的络合剂(如TBP-HNO3),因此,与传统的溶剂萃取法相比,减少了二次废物的产生,降低了对环境的污染。研究超临界CO2流体萃取U3O8的技术,可以探索此项技术在核工业中应用的可行性。本工作首先建立了超临界CO2流体萃取固体样品的实验方法。在2000目不锈钢筛网中定量加 Supercritical fluid with mass transfer speed, dissolving ability and so on. In the extraction of metal samples, only a small amount of complexing agent (such as TBP-HNO3) is added. Therefore, compared with the traditional solvent extraction method, secondary waste generation is reduced and environmental pollution is reduced. The technology of supercritical CO2 fluid extraction U3O8 can explore the feasibility of this technology in the nuclear industry. This work first established a supercritical CO2 fluid extraction solid sample experimental method. In 2000 mesh stainless steel mesh quantitative plus