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本文研究核燃料前处理常用萃取剂二(2-乙基己基)磷酸(HDEHP)和二苯基亚砜(Φ_2SO)从硫酸溶液中萃取铀(VI),实验测得其协萃平衡常数1gβ_(12)=4.93,同条件下,HDEHP+TBP的协萃平衡常数1gβ_(13)=4.83。数据表明,二苯基亚砜的协萃能力略大于磷酸三丁酯(TBP)。根据协同萃取规律中的配位数饱和原理,我们推测在二元协萃络合物UO_2A_2(HA)_2·B内界还可能包含一个配位水分子,故又对HDEHP+Φ_2SO+TBP三元体系萃取U(VI)作了试验,萃取分配比D_总D_1+d_(12)+d_(13),说明在本文的实验条件下,可能形成混合二元协萃络合物。
In this paper, uranium (VI) was extracted from sulfuric acid solution with two extractants (HDEHP) and diphenylsulfoxide (Φ_2SO) which were commonly used as pretreatment solvents for nuclear fuel. The equilibrium constant 1gβ_ (12) ) = 4.93, under the same conditions, HDEHP + TBP stripping equilibrium constant 1gβ_ (13) = 4.83. The data show that the synergistic extraction capacity of diphenylsulfoxide is slightly greater than that of tributyl phosphate (TBP). According to the principle of coordination number saturation in the synergistic extraction rule, we speculate that there may be a coordinative water molecule in the interior of binary coexistent complex UO_2A_2 (HA) _2 · B. Therefore, the ternary HDEHP + Φ_2SO + TBP The extraction of U (VI) by the system was tested and the ratio of D_ to total D_1 + d_ (12) + d_ (13) was extracted, which indicated that under the experimental conditions of this paper, a mixed binary complex could be formed.