Studies on the separation treatment of high-level liquid waste by bisamide podand(I): Extraction and separation of An(III) from Ln(III)

Abstract

A process for actinide(III) and lanthanum(III) extraction separation from high-level liquid waste (HLLW) was proposed, with N,N,N',N' -tetraoctyl diglycolamide (TODGA) as the extractant, tri- n ‑butyl phosphate (TBP) as the phase modifier and 2,6-bis[1-(propan-1-ol)-1,2,3-triazol-4-yl]pyridine (PyTri-Diol or PTD) as hydrophilic stripping agent. This ‘hot test’ was successfully carried out, achieving 99.92% removal of americium-241 ( 241 Am) with a separation factor SF (Eu/Am) of 3.8 × 10 3 in the actinide(III) product solution. The results show that bisamide podand extractants can effectively realize the extraction and separation of actinide(III) and lanthanum(III) from Chinese commercial HLLW and thus have a bright practical application potential for the treatment of commercial HLLW. A process for extraction and separation of An(III) and Ln(III) from HLLW in a hot test was proposed in which N,N,N',N' -tetraoctyl diglycolamide and tri- n ‑butyl phosphate (TODGA + TBP) was used as the extractant and 2,6-bis[1-( propan -1- ol )-1,2,3- triazol -4- yl ]pyridine (PyTri-Diol or PTD) was used as the aqueous stripping agent.