内耦合萃反交替分离法从稀溶液中提取与富集稀土的研究

A New Method of Extracting and Concentrating Rare Earth from Dilute Solution-Inner Coupling Extraction Stripping Process

内耦合萃反交替分离法是本实验室发展起来的一种新型液膜分离法。本文较系统地探讨了该方法从稀溶液中提取与富集稀土的可能性。研究结果表明：对于１ｇ／Ｌ的稀土Ｌａ^（３＋）溶液，以１０％（Ｖ／Ｖ）的Ｐ２０４煤油溶液为有机相，内耦合萃反交替分离法的稀土提取率可达９９％，浓缩液中Ｌａ^（３＋）浓度可高达３５２ｇ／Ｌ（折合氧化稀土４１３ｇ／Ｌ），浓缩液剩余酸浓度低于０．２ｍｏｌ／Ｌ。

Inner coupling exriactiol stripping process(ICESP) developed in our laboratory is a novel chemical separation method. The feasibility of extracting and concentrating rare earth from dilute solution by ICESP was investigated in this paper. The experimental results showed that over 99% extraction of La￣(3+) from feed solution containing about lg/L La￣(3+) was reached using P204 as extractant. Meanwhile, the concentrate containing 352 g/L La￣(3+) (or 413 g/L La_2O_3) with less than 0.2 mol/L of remainder acid can be obtained in batches or continuous operation.