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测得17、25、33、41、49℃下甲基膦酸二仲辛酯(P-350)萃取希土元素(La、Ce、Pr、Nd、Sm、Eu、Gd)的分配系数,从其结果计算了萃取过程的焓及其相对吉氏函数和熵变,并进行讨论。研究了La(NO_3)_3—Ce(NO_3)_3—HNO_3—H_2O—P-350和Ce(NO_3)_3—Pr(NO_3)_3—H_2O—P-350萃取体系在不同希土料液浓度及两个希土元素不同克分子比条件下的平衡,测定其分离因数。指出P-350对希土的萃取分离效能主要是依靠盐析作用。
The partition coefficient of rare earth elements (La, Ce, Pr, Nd, Sm, Eu, Gd) extracted by the di-secoctyl methylphosphonate (P-350) was measured at 17,25,33,41,49 ℃. From The results calculated the enthalpy of the extraction process and its relative Kyrgyz function and entropy change, and discussed. The effects of La (NO_3) _3-Ce (NO_3) _3-HNO_3-H_2O-P-350 and Ce (NO_3) _3-Pr (NO_3) _3-H_2O- A rare earth elements at different molar ratios under the conditions of equilibrium, determination of the separation factor. Pointed out that P-350 on the performance of the extraction and separation of relict mainly rely on salting-out effect.