三出口萃取工艺静态平衡研究

A STUDY ON THE STATIC EQUILIBRIUM FOR THREE-EXIT EXTRACTION SEPARATION PROCESS

三出口萃取工艺是在普通分馏萃取工艺中间级增开一个出口使之同时分离三个组份。采用这一工艺可大大简化多元体系分离流程,提高经济效益。本文根据恒定总萃取比体系的本出口萃取工艺中各组份的静态物料平衡,推导出四种三出口萃取工艺的极值公式。通过计算机静态模拟计算确定了Gd/Tb/Dy三出口萃取工艺参数,并通过试验验证了计算结果。

The three-exit extraction separation process(TESP) has been widely used in theseparation of rare earths. For the simultaneous separation of A/B/C, there are four kindsof TESP. Based on the static equilibrium of A, B and C. in extraction, formulae of theextreme values were derived for determing the separation parameters of the TESP. With computer simulation, parameters for the separation of Gd/Tb/Dy were determined.It is shown that Tb component has been richened from 4.5% to 53.5% with 98% recoveryin the experimental test.