Extraction of cesium and strontium from nitric acid hlw by a mixture of extractants of -18-crown-6 and -21-crown-7 derivatives in organic solvents

Abstract

The processes of extraction of stable isotopes of cesium and strontium by solutions of macrocyclic polyesters in organic solvents from nitric acid mediums have been studied. The e ect of the crown ether structure and solvent type on the distribution coe cients of cesium ( D Cs) and strontium ( D Sr) has been studied. Extraction systems for the combined extraction of cesium and strontium were tested, in which 1,1,7-trihydrododeca uoroh eptanol and chlorohydrocarbons were used as solvents. It is shown that the highest D Cs and D Sr in the combined extraction of metals are observed when using a mixture of DTBDB18C6 and DCH18C6. Experimental data con rm the high e ciency of the use of crown ethers for the extraction of cesium and strontium into a separate fraction when handling radioactive waste.