Synergic effect for uranium extraction from soil by TBOD and co-solvent using Sc-CO2

The extraction process of uranium is one of the most important fields from the uranium mining to the spent fuel reprocessing. However, conventional organic solvent extraction produces a lot of liquid waste. The SFE (Supercritical fluid extraction) is extraction by substances occurring at temperatures and pressures above critical. The agent most widely used for SFE is carbon dioxide, which is nontoxic, readily available, inexpensive and mild critical parameters (temperature above 31 .deg. C and pressure above 73 bar). The Sc-CO2 (Supercritical carbon dioxide) may be a good extraction solvent due to the ease with which it can be recycled, and the fact it leaves negligible amounts of secondary wastes. But Sc-CO2 do not extract metallic contaminants because it has the non-polar property. So, in order to extract the radioactive metal from radioactive wastes, Sc-CO2 needs chelating ligands or surfactants such as organophosphorus, crown ethers, β-diketone, or dialkyldithiocarbamates. The TBOD has some advantages: (i) high irradiation stability (ii) strong affinity to metallic ions (iii) completely incinerated without secondary solid waste. At this work, we have to extract the uranium metal from contaminated soil which adsorbed non-radioactive uranium using TBOD in Sc-CO2