高盐废液铷钾萃取分离及氯化铷制备工艺研究

Technological Research on Extraction Separation of Rubidium and Potassium in High-salt Waste Liquid and Preparation of Rubidium Chloride

为了回收江西某高盐废液中的铷钾,以t-BAMBP为萃取剂、磺化煤油为稀释剂来分离铷钾。考察了料液pH、萃取剂浓度、萃取相比、萃取时间、萃取级数对铷钾萃取率的影响及洗涤相比、洗涤级数对铷钾洗脱率的影响。结果表明,在料液pH值13.5、萃取剂浓度0.8 mol/L、O/A相比5∶1、萃取时间5 min的条件下进行10级萃取,铷萃取率达到98.42%,最终经蒸发结晶获得纯度在99%以上的氯化铷产品。

In order to recover rubidium and potassium from a high-salt wastewater in Jiangxi, t-BAMBP was used as the extractant and sulfonated kerosene was used as the diluent to separate rubidium and potassium.The effects of feed solution pH,extractant concentration, extraction phase ratio, extraction time and extraction stage on the extraction rate of rubidium and potassium, and the effects of washing phase ratio and washing stage on the elution rate of rubidium and potassium were investigated.The results show that the extraction rate of rubidium reaches 98.42% by 10-stage extraction under the conditions of feed solution pH 13.5,extractant concentration 0.8 mol/L,O/A phase ratio 5∶1,and extraction time 5 min.Finally, rubi-dium chloride product with a purity of more than 99% is obtained by evaporation and crystallization.