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用二(2-乙基己基)磷酸(D2EHPA)或2-乙基己基磷酸2-乙基己酯(MEHPA)这些有机磷化合物作萃取剂,对碱金属和碱土金属(Li、Na、K、Mg、Ca)的溶剂萃取进行了研究.测定了萃取平衡常数和有机相中每种金属络合物的组成.观测到了萃取锂和钠时磷酸三丁酯(TBP)的协同效应.并假定这一效应是由于TBP替代了溶剂合萃取剂(D2EHPA或MEHPA)的结果。最后,曾尝试用上述溶剂萃取体系从日本大分的温泉水中回收锂.
(Li, Na, K, N, N, N-dimethylformamide) with organic phosphorus compounds such as bis (2-ethylhexyl) phosphoric acid (D2EHPA) or 2-ethylhexyl 2-ethylhexylphosphate (MEHPA) Mg, Ca) were investigated.The equilibrium constants of extraction and the composition of each metal complex in the organic phase were determined.The synergistic effect of TBP on the extraction of lithium and sodium was observed and it was assumed that One effect is the result of TBP replacing the solvent combination extractant (D2EHPA or MEHPA). Lastly, attempts have been made to recover lithium from hot spring water in Oita, Japan using the solvent extraction system described above.