摘要
研究了含锕系元素的30％TRPO-煤油负载有机相在硝酸、草酸和碳酸钠溶液中的反萃行为,给出了钢系元素的反萃条件。5—6mol/1硝酸能有效地反萃镅和镧系元素,过高的硝酸浓度下体系形成三相。0.5mol/1草酸二次错流反萃可回收99％以上镎和钚。5％碳酸钠可反萃铀。3个分组之间交叉沾污很小。提出了TRPO从高放废液中去除锕系元素流程简图。
The stripping behavior of actinide elements loaded in 30% TRPO-kerosene solution with nitric acid,oxalic acid and sodium carbonate solution is studied and stripping parameters are given. Americium and lanthanide elements can be effectively stripped with 5-6mol/l nitric acid,but at higher nitric acid concentration third phase would appear. More than 99% neptunium and plutonium could be recovered in two times stripping by 0. 5 mol/l oxalic acid with crossflow. Uranium is stripped with sodium carbonate. The cross contamination between the three fractions are very little. A proposed flowsheet for the removal of actinide elements from high level radioactive waste by TRPO extraction is presented.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
1992年第4期193-201,共9页
Journal of Nuclear and Radiochemistry
关键词
锕系元素
废液
萃取
三烷基氧膦
Actinide elements, HAW, Extraction, Trialkylphosphine oxide.
