Process Study on N523-TBP-Sulfonated Kerosene Extraction System for Extraction of Lithium from Brine Saturated by Magnesium Chloride

Process of extracting lithium from magnesium chloride saturated brine using 20%N523-30%TBP-50% sulfonated kerosene extraction system has been studied.Three stages countercurrent extraction experiment has been completed according to the extraction theoretical stage which is determined by ladder diagram method after the extraction equilibrium isotherm resulted from phase ratio experiment.The full 8-stage extraction procedure is determined according to the study of the process consisted of extraction,abstersion,stripping and extractant regeneration.Through this method,the extraction rate of lithium reaches to 96% with low impurity in strip liquor.The capability of the extractant was retained after many cycles without any solution loss and emulsifying phenomenon.