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用改进的TRPO流程进行了从动力堆核燃料后处理高放废液模拟料液中去除锕系元素的串级实验验证。流程中采用了模拟料液中镎的电解还原调价,以提高镎的去除效果。当料液酸度为1mol/L HNO_3时,经过几级萃取能有效地去除模拟料液中>99.9％的镅、钚,镎和铀。改进了早期采用的氨羧络合剂络合反萃锕系元素的流程,采用高酸、草酸和碳酸钠分别反萃Am+RE,Np+Pu和U,使锕系元素分成三组,各组之间的交叉沾污很小。裂片元素在流程中的行为分成三类,除稀土、钯、锆、钼等随锕系元素共萃外,其他裂片被部分萃取或不被萃取,流程中增加洗涤段可以改善这二类裂片元素的分离效果。文中给出了锕系元素和Tc在各级中的浓度剖面,也给出了它们和裂片元素在各物流中的分布。
A series of experimental verification of removal of actinides from simulated feedstock of post-treatment high-level liquid waste of power reactor nuclear fuel was carried out with an improved TRPO process. The process used to simulate the liquid feed in the electrolytic reduction of price adjustment, in order to improve the removal of 镎 effect. When the acidity of feedstock is 1mol / L HNO3, after several stages of extraction, 镅, plutonium, 镎 and uranium in the simulated feedstock can be effectively removed. The process of complexation of actinide with complexing of ammonia and carboxylaluminum complex was improved. Amine, RE, Np + Pu and U were stripped by high acid, oxalic acid and sodium carbonate, respectively. The actinides were divided into three groups Cross-contamination between groups is minimal. In addition to rare earth, palladium, zirconium, molybdenum and other actinides co-extraction, the other lobes were partially extracted or not extracted, the process of increasing the washing section can improve these two types of lobes elements The separation effect. The concentration profiles of actinides and Tc in all stages are given in the paper, and the distributions of them and the elements of slits in each stream are also given.