我国南方中钇富铕混合稀土萃取分组工艺研究

A Study of the Technological Process for Separating Associated Rare Earth with Medium Content of Yttrium and Rich Europium

本文提出了萃取分离中钇富铕混合稀土的合理工艺流程,完成了Tb/Dy、Nd/Sm、Ce/Pr分组的串级模拟试验,为进一步提取目前市场急需的Sm_2O_3、Eu_2O_3、Gd_2O_3、Tb_4O_7、Y_2O_3、Nd_2O_3等单一稀土创造了有利的条件。各分离段的工艺参数均在IBM—PC计算机上,用串级萃取理论的最优化方程和极值公式进行设计,并将各分离段工艺参数的最优值,在Cromemcro计算机上,完全模拟串级萃取“漏斗法”的操作,进行了动态平衡计算,最后用分液漏斗串级摸拟试验进行了验证。其计算结果与实验结果完全吻合,从而提出了萃取分组的最佳工艺条件。

In this paper, we present a completely new technological process for separating associated rare-earth minerals with a medium content of yttrium and rich europium. Previously, we have completed countercurrent analogous experinebts in groups with Tb/Dy, Nd/Sm, and Ce/Pr, with a view to creating a new process for extracting each of the rare earth minerals such as Sm_2O_3, Eu_2O_3, Gd_2O_3, Tb_4O_7, Y_2O_3, Nd_2O_3, etc. that are in great demand on the market. In the preparation of the experiments,the parameters of each separation section were designed with an IBM-PC computer, using the optimization equations and extreme values formulas from the countercurrent extraction theory. then the optimal parameters thus obtained were input separately into a cromencro computer to do the dynamic equilibrium calculations, strictly simulating the'funnel method' of two-component eountercurrent extraction as practised in laboratories. Finally, we verified those results by analogous experiments. As the calculations proved to accord well with the experimental results, we applied them to the optimal process conditions for extracting the associated rare earths in the roar groups.