摘要
Ｎ，Ｎ，Ｎ′，Ｎ′ｔｅｔｒａｂｕｔｙｌｍａｌｏｎａｍｉｄｅａｓａｎｅｗｅｘｔｒａｃｔａｎｔｆｏｒｅｘｔｒａｃｔｉｏｎｏｆｎｉｔｒｉｃａｃｉｄａｎｄｕｒａｎｉｕｍ（ＶＩ）ＷａｎｇＹｏｕＳｈａｏ，ＳｕｎＧｕｏＸｉｎ，ＬｉＹｕＬａｎ，ＢａｏＢ...
N,N,N ′,N ′ tetrabutylmalonamide (TBMA) is synthesized and used for extraction of uranyl(II) ion from nitric acid media in a diluent composed of 50% 1,2,4 trimethyl benzene (TMB) and 50% kerosene(OK). The effects of nitric acid concentration, extractant concentration, temperature, salting out agent (LiNO 3) and back extraction on distribution coefficients of uranyl(II) ion have been studied. The extraction of nitric acid is also studied. The main adduct of TBMA and HNO 3 is HNO 3·TBMA, and there are more than two kinds of adducts in 3.0 mol/L nitric acid solutions, such as HNO 3·TBMA, (HNO 3) 2·TBMA and (HNO 3) 3·TBMA. The complex formation of uranyl(II) ion, nitrate ion and TBMA (1:2:1) as extracted species is further confirmed by IR spectra of the saturated extraction of uranyl(II) ion with TBMA, and the values of thermodynamic parameters have also been calculated.
关键词
铀
硝酸提取
新萃助剂
N,N,N ', N ' tetrabutylmalonamide(TBMA), Solvent extraction,
Uranium(VI), Salting out agent, Back extraction
