铀矿渣、土壤和泥浆等含铀放射性固体废物,其特点是基体复杂、表面不规则、且铀含量通常小于1%。传统的去污方法需要消耗大量的化学试剂,经济效益低、二次废物产生量大。超临界流体的溶解能力高、穿透力强,因此,超临界CO2流体(SCF)萃取技术特别适用于放射性固体废物中微量铀的提取。超临界CO2流体萃取技术主要应用于两个方面 Uranium slag, soil and mud containing uranium radioactive solid waste, which is characterized by complex matrix, surface irregularities, and the uranium content is usually less than 1%. The traditional decontamination method needs to consume a large amount of chemical reagents, low economic benefits and large secondary waste generation. Therefore, supercritical CO2 fluid (SCF) extraction technology is especially suitable for the extraction of trace uranium in radioactive solid wastes. Supercritical CO2 fluid extraction technology is mainly used in two aspects