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二(2-乙基己基)二硫代磷酸对镅和稀土元素协同萃取的研究

Extraction of Am³⁺and rare eaths by DEHDTP combined with TOPO, DPPHEN and TOPS

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【Author】 XU Qichu ZHANG Lixing YANG Yusheng(Northwest Institute of Nuclear Technology, Xi ’an 710024 )

【机构】西北核技术研究所；西北核技术研究所西安 710024；西安 710024；西安 710024；

【摘要】研究了二(2-乙基己基)二硫代磷酸(DEHDTP)和三辛基氧磷(TOPO)、4,7-二苯基-1,10-邻二氮菲(DPPHEN)、三辛基硫磷(TOPS)三种协萃剂对Am3+、Nd3+、Eu3+、Tm3+的协同(混合)萃取行为。TOPO和DPPHEN有很强的协萃能力,并提高了镅和稀土元素之间的分离系数,前者β(Am/Eu)=3.9,后者β(Am/Eu)=2,而TOPS几乎没有协萃作用。在常量稀土离子存在时分离系数进一步提高,TOPO的β(Am/Eu)=71,DPPHEN的β(Am/Eu)=3。更多还原

【Abstract】 The extraction behavior of Am3 +, Nd3 +, Eu3 + and Tm3 + from NaClO4 solution by di (2-ethylhexyl) di-thiophosphoric acid (DEHDTP) combined with trioctylphosphine oxide ( TOPO ), 4,7-diphenyl-1,10-phenanthroline (DPPHEN) and trioctylphosphine sulfide (TOPS) was studied. While TOPO and DPPHEN give strong synergism and higher selectivity toward Am3 + ( TOPO: β(Am/Eu)= 3.9, DPPHEN: β(Am/Eu)= 2), TOPS presents no synergism. Using DEHDTP combined with TOPO, the separation factor β(Am/Eu) increases as high as 71 in the presence of macroNd(ClO4)3.更多还原