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本文研究了用加压离子交换法分离钆和铕在EDTA排代剂中加入适量弱酸盐,可以显著地改善分离效果。当EDTA浓度从0.015M提高到0.05M,线性流速为7.5cm/min,柱温70℃,柱比1:3时就能得到良好的分离,稀土谱带移速达到30cm/h,排出液中稀土浓度按氧化物计可达10g/l,具有工业生产应用价值。若在EDTA中不加适当的弱酸盐,只要调节适当的pH,在上述条件下钆和铕也能得到较好的分离,表明在使用微粒树脂的条件下,钆铕分离的柱比较用其分离因数α_(Eu)~(Gd)≈1.10计算值要小得多。这就为用离子交换法分离最难分离的钆铕提供了重要依据。
In this paper, the separation of gadolinium and europium by pressurized ion exchange method in the EDTA displacing agent by adding appropriate amount of weak acid salt, can significantly improve the separation effect. When the EDTA concentration increased from 0.015M to 0.05M, the linear flow rate was 7.5cm / min, the column temperature was 70 ℃, the column ratio was 1: 3, the separation was good. The moving speed of rare earth band was up to 30cm / h. Rare earth concentration of oxide up to 10g / l, with industrial production value. Without appropriate weak acid salts in EDTA, Gadolinium and Europium also gave good resolution under the above conditions, as long as the proper pH was adjusted, indicating that the column with gadolinium-europium separation was more suitable for use with microparticulate resins Separation factor α_ (Eu) ~ (Gd) ≈1.10 Calculated value is much smaller. This provides an important basis for the ion exchange separation of the most difficult to isolate gadolinium europium.