从锂云母浸出液中分离铷铯试验研究

Study on Separation of Rubidium and Cesium from Lepidolite Leaching Solution

采用溶剂萃取法对某锂云母浸出液中的铷、铯进行分离试验。考察萃取剂浓度、料液碱度和萃取相比对铷、铯萃取分离效果的影响。萃取分离铯、铷的较优条件为:萃取剂t-BAMBP浓度0.7mol/L、环己烷+磺化煤油为稀释剂、相比O/A=1、料液碱度0.3mol/L、萃取时间10min,铷萃取率为90.0%,铯萃取率为32.0%。负载有机相洗涤条件为:洗涤液氯化钠浓度0.1mol/L、相比O/A=1、洗涤时间10min,铷洗脱率为80.0%,铯洗损率为9.36%,分离效果较好。

Rubidium and cesium were separated from purified lepidolite leaching solution by solvent extraction method.Effects of concentration of extracting agent,alkalinity and extraction phase ratio O/A on separation of rubidium and cesium were discussed.Extraction rate of rubidium and cesium is 90.0%and 32.0%respectively under the optimum conditions including concentration of extractant of t-BAMBP of 0.7 mol/L,O/A=1,alkalinity of 0.3 mol/L,and extracting time of 10 min with cyclohexane and sulfonated kerosene as diluent.Rubidium elusion rate is 80.0%and cesium losing rate during washing is 9.36%from loaded organic phase under the optimum conditions including washing agent concentration of NaCl of 0.1 mol/L,O/A=1,and washing time of 10 min.