【摘要】 研究了３０％ Ｔ Ｂ Ｐ煤油萃取 Ｕ（ Ｎ Ｏ３）４  Ｈ Ｎ Ｏ３ 时， Ｕ（Ⅳ）和 Ｈ Ｎ Ｏ３ 浓度对形成第三相的影响。测定了各相中 Ｕ（Ⅳ）和 Ｈ Ｎ Ｏ３ 的浓度以及重有机相和轻有机相的 Ｔ Ｂ Ｐ浓度。实验结果表明， Ｕ（Ⅵ）的存在，减少了 Ｕ（Ⅳ）和 Ｈ Ｎ Ｏ３ 在重有机相与轻有机相中的浓度，当有足够的 Ｕ（Ⅵ）存在时，第三相就消失；当苯及其衍生物、氯仿、四氯化碳和低碳直链饱和烃为稀释剂时，萃取不易形成第三相，长碳直链饱和烃为稀释剂萃取时，容易形成第三相。更多还原

【Abstract】 Effects of concentraction of uranium(Ⅳ), nitric acid, uranium(Ⅵ)and different diluents on the formation of the third phase are investigated in extraction of uranium(Ⅳ)and nitric acid by 30%TBP.The equilibrium concentrations of uranium(Ⅳ)and nitric acid in aqueous phase, heavy organic phase and light organic phase are determined respectively. The equilibrium concentrations of TBP in heavy organic phase and light organic phase are also determined. The experimental results show that if uranium(Ⅵ) exists in aqueous system of U(NO 3) 4 HNO 3,the extraction distribution of U(Ⅳ) and HNO 3 in organic phase decreases and the third phase disappears at last, when the concentration of uranium(Ⅵ) in U(NO 3) 4 HNO 3 solution is high enough. When benzene, derivate of benzene, chloroform, carbon tetrachloride and lower linear chain saturated hydrocarbon are used as diluent, the third phase is not easily formed. However, as hiigher linear chain saturated hydrocarbon is used as diluent, the third phase is easily formed.更多还原