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本文在与加压离子交换排代法分离稀土元素相一致的条件下,用动态法测定了八对相邻稀土元素的分离因数。其结果为:α_(Nd)~(Pr)=2.04±0.06;α_(Sm)~(Nd)=2.59±0.07;α_(Eu)~(Sm)=1.62±0.02;α_Y~(Tb)=1.81±0.02;α_(Dy)~Y=1.20±0.02;α_(Tm)~(Er)=2.05±0.04;α_(Yb)~(Tm)=2.06±0.03;α_(Lu)~(Yb)=1.36±0.06。将实验值与由络合稳定常数计算的分离因数进行了比较(1)。结果表明,某些稀土元素对的分离因数实验值与计算值相差很大。经验证,用实验值计算出的最小区段数和加压离子交换排代法分离稀土元素时实验求得的最小区段数是一致的。
In this paper, the separation factor of eight pairs of adjacent rare earth elements was determined by dynamic method under the same conditions of separation of rare earth elements by pressurized ion exchange displacement method. The results showed that α_ (Nd) ~ (Pr) = 2.04 ± 0.06, α_ (Sm) ~ (Nd) = 2.59 ± 0.07, α_ (Eu) ~ 1.62 ± 0.02 and α_Y ~ (Tb) = 1.81 Α_ (Tm) = 2.05 ± 0.04; α_ (Yb) ~ (Tm) = 2.06 ± 0.03; α_ (Lu) ~ (Yb) = 1.36 ± 0.06. The experimental values were compared with the separation factor calculated from the complexation stability constant (1). The results show that the separation factor of some rare earth elements experimental values and calculated values vary greatly. It has been verified that the minimum number of sections calculated experimentally and the minimum number of sections experimentally obtained when the rare earth elements are separated by pressurized ion exchange displacement method are consistent.