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

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.

用TRPO从高放废液中去除锕系元素的研究──微型离心萃取器串级冷实验

采用微型离心萃取器进行了ＴＲＰＯ流程从模拟高放废液中去除锕系元素的冷实验。实验中用Ｎｄ代替Ａｍ，Ｚｒ代替Ｎｐ、Ｐｕ，在模拟高放废液稀释３倍、酸度为１．０ｍｏｌ／ｌ时，采用１２级萃取、４级洗涤能有效地去除模拟高放废液中９９．９％以上的Ｎｄ、Ｚｒ，满足了冷实验要求，并且萃取中不出现三相，可以使萃入的Ｆｅ洗下６０％，避免大量Ｆｅ进入后续流程。采用硝酸、草酸分别反萃Ｎｄ和Ｚｒ，使Ｎｄ和Ｚｒ分成二组，交叉污染很小。文中给出了硝酸、Ｎｄ、Ｚｒ等在各级的浓度剖面和它们在各物流中的分布。