二环己基18冠6从硝酸溶液和模拟高放废液中萃取镅、钚、铀的研究

EXTRACTION OF Am、Pu AND U BY DICYCLOHEXANO 18 CROWN 6/1 OCTANOL FROM HNO_3 SOLUTION AND SIMULATED HLLW

摘要: 研究了二环己基１８冠６（ＤＣＨ１８Ｃ６）－正辛醇从硝酸溶液和模拟高放废液中镅、钚、铀的萃取。考察了酸度和模拟高放废液（ＨＬＬＷ）的稀释倍数对萃取分配比的影响。研究结果表明，在低硝酸浓度和较大稀释倍数情况下，ＤＣＨ１８Ｃ６对镅、钚、铀的萃取分配比都比较小，并随着水相硝酸浓度的增大而增大，随着模拟高放废液稀释倍数的增大而减小；提高萃取剂浓度会增大四价钚的萃取。

Abstract: The extraction of americium,plutonium and uranium by dicyclohexano 18 crown 6(DCH18C6)/1 octanol from HNO 3 solution and simulated HLLW are studied.The influences of acidity and dilution factor of simulated HLLW are studied.At low HNO 3 concentration and dilution factor above 2, 0.1 mol/L DCH18C6/1 octanol extracts very little americium,plutonium and uranium.The distribution ratios of Am、Pu and U increase with the increase of HNO 3 concentration in aqueous phase,and decrease with increasing of dilution factor of HLLW.The distribution ratio of extraction of Pu(Ⅳ) increases with the increase of extractant concentration.