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为优化处理高放废液的流程,我国建立了以DHDECMP为萃取剂回收锕系元素的流程。但这类萃取剂不能实现三价锕系和镧系元素间的分离,流程中这两组元素一起从R-B槽转入酸度为0.2—0.5mol/l(HNO_3)反萃液中。为了完善对高放废液的处理,避免脱硝降酸所带来的麻烦,本工作选用HDEHP作萃取剂,DTPA为络合剂,Am~(3+)代表三价锕系元素,Eu~(3+)、Gd~(3+)代表镧系元素,研究了在0.2—0.5mol/l HNO_3条件下
In order to optimize the process of high-level liquid waste, China has established a process for the recovery of actinides with DHDECMP as an extractant. However, this type of extractant does not allow separation between the trivalent actinides and the lanthanides. The two sets of elements are transferred together from the R-B tank into the 0.2-0.5 mol / l (HNO 3) stripping solution. In order to improve the treatment of high-level liquid waste, to avoid the trouble caused by the de-nitrification and deacidification, this work selected HDEHP as extractant, DTPA as complexing agent, Am ~ (3+) on behalf of the actinides, Eu ~ 3 +), Gd ~ (3+) for the lanthanides, studied in 0.2-0.5mol / l HNO_3 conditions