【摘 要】
：
Salt-lake brines are important mineral resources of lithium (Li),boron (B) and magnesium (Mg) [1].However,recovery of Li and B from high concentrated Mg brines after removing sodium and potassium are
【机 构】
：
State Key Laboratory of Biochemical Engineering,Key Laboratory of Green Process and Engineering,Inst
【出 处】
：
第七届国际分离科学与技术会议(Proceedings of the 7th International Conferen
论文部分内容阅读
Salt-lake brines are important mineral resources of lithium (Li),boron (B) and magnesium (Mg) [1].However,recovery of Li and B from high concentrated Mg brines after removing sodium and potassium are difficult due to high Mg/Li concentration ratios [2].In comparison with traditional sedimentation and adsorption methods,solvent extraction of Li and B from slat-lake brines exhibits obvious advantages in high recoveries,separation selectivity,and economical efficiency [3].In present work,a novel three-liquid-phase extraction technique is proposed for separation of lithium and boron from high concentrated magnesium brine of salt lake.The experimental results indicated that in three-liquid-phase system of TBP-PEG-(NH4)2SO4-H2O,Li and B could be extracted and separated into the top organic and middle polymer phases respectively,while most of Mg and other impurity were left and enriched in the bottom aqueous phase.The separation factor of Li/B between organic top phase and polymer middle phase was considerably high.Various influences on extraction and separation of Li and B in the three-liquid-phase system were investigated,including initial H+ and Cl- concentrations,molar ratio of Fe to Li,added amount of PEG and (NH4)2SO4,TBP content in organic phase.The present work highlights a promising technique to extract and separate Li and B from salt-lake brine with high Mg/Li ratio.By this technique,the recovery and separation of Li and B can be achieved simultaneously within one step of extraction.The new method opens up an entirely new approach to realize comprehensive exploitation of salt lakes in China.
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