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本文用0.105M NTA高压离子交换排代色层法分离Nd、Sm、Y三元素,研究了不稳定阶段排代离子进入稀土区段的过程,对氢阻滞床和铜阻滞床的不同情况进行了讨论,提出了由排代离子浓度计算“最小柱比数”的经验式。明确了在这种条件下“最小柱比数”与区段长度的关系。实验表明,用氢作阻滞离子时无论排代剂中加入硝酸铵与否,由于没有排代离子穿过稀土区段前沿,稳定区段的移动速度可用公式进行计算。在用铜作阻滞离子时,排代剂中不含有硝酸铵,则仍然可以用上式计算稳定区段移动速度;如果含有硝酸铵,则有一部分排代离子穿过稀土区段,不起排代作用。由此,我们提出了一个计算穿透铵量的经验式。
In this paper, 0.105M NTA high pressure ion-exchange displacement chromatography was used to separate Nd, Sm and Y three elements. The process of substituting ions entering the rare earth section was studied. Different conditions of hydrogen-retarding bed and copper- The discussion was made and an empirical formula for calculating the “minimum column ratio” was proposed by displacing ion concentrations. Clear under this condition, “the minimum column ratio” and the relationship between the length of the section. Experiments show that when hydrogen is used as retarding ion, the displacement velocity of the stabilizing section can be calculated by the formula because no ion is passed through the front of the rare earth section irrespective of the addition of ammonium nitrate in the displacing agent. In the use of copper for blocking ions, the displacement agent does not contain ammonium nitrate, you can still use the above formula to calculate the stability of the moving speed segment; if the ammonium nitrate, there is a part of the displacement of ions through the rare earth zone, can not afford Displacement effect. Thus, we propose an empirical formula to calculate the amount of penetrated ammonium.