Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 1999, Vol. 10 ›› Issue (1): 19

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Solvent extraction of nitric acid, uranium(VI) and thorium(IV) by N,N,N'‚N'-tetrahexylsuccinylamide

TAN Xufang1, WANG Youshao1, TAN Taizhe1, YANG Yanzhao2, BAO Borong2, SUN Sixiu3   

  1. 1 Laiyang Agricultural College, Laiyang 265200;
    2 Shanghai Institute of Nuclear Research, the Chinese Academy of Sciences, Shanghai 201800;
    3 Department of Chemistry, Shandong University, Jian 250100
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TAN Xufang, WANG Youshao, TAN Taizhe, YANG Yanzhao, BAO Borong, SUN Sixiu. Solvent extraction of nitric acid, uranium(VI) and thorium(IV) by N,N,N'‚N'-tetrahexylsuccinylamide.Nuclear Science and Techniques, 1999, 10(1): 19

Abstract: A new kind of diamide N,N,N'‚N'-tetrahexylsuccinylamide (THSA) was synthesized, characterized and used for the extraction of HNO3, U(VI) and Th(IV) in a diluent composed of 0.5 volume fraction 1,2,4-trimethy benzene(TMB) and 0.5 volume fraction kerosene(OK). Extraction distribution coeflicients of U(VI) and Th(IV) as functions of aqueous nitric acid concentration, extractant concentration, temperature and salting-out agent (LiNO3) have been studied, and it is found that THSA as an extractant is superior to TBP for extraction of U(VI) and Th(IV). Back extraction was also studied. At low acidity, the main adduct of THSA and HNO3 is HNO3·THSA. THSA·(HNO3)2 and THSA·(HNO3)3 are also found at high acidity. The compositions of extracted species, apparent equilibrinm constants and enthalpies of extraction reactions have also been calculated.

Key words: N,N,N',N'-tetrahexylsuccinylamide, Nitric acid, Uranium(VI), Thorium(IV), Back extraction, Salting-out agent