Abstract: Tri-n-butyl phosphate (TBP)dissolved in kerosene was chosen as extractant for lithium from a model brine having high
magnesium-to-lithium ratio and ferric chloride was added to the system.The influences of contact time, concentration of the
extractant, concentrations of some salts (Mg2＋, Na＋, K＋)in the solution, acidity of hydrochloric acid and extraction
temperature on the extraction of lithium with TBP-kerosene system were studied.The suitable extraction conditions were found
to be ：contact time not any less than 20 min；at 20—25℃；［Fe3＋］／［Li＋］about 1.5—2.0；TBP concentration 50％—70％;
[MgCl2] exceeding 3 mol*L－1；pH about 2；while most sodium and potassium salts in the aqueous phase should be removed before
the extraction.

Key words: lithium, solvent extraction, tri-n-butyl phosphate, ferric chloride

摘要： Tri-n-butyl phosphate (TBP)dissolved in kerosene was chosen as extractant for lithium from a model brine having high
magnesium-to-lithium ratio and ferric chloride was added to the system.The influences of contact time, concentration of the
extractant, concentrations of some salts (Mg2＋, Na＋, K＋)in the solution, acidity of hydrochloric acid and extraction
temperature on the extraction of lithium with TBP-kerosene system were studied.The suitable extraction conditions were found
to be ：contact time not any less than 20 min；at 20—25℃；［Fe3＋］／［Li＋］about 1.5—2.0；TBP concentration 50％—70％;
[MgCl2] exceeding 3 mol*L－1；pH about 2；while most sodium and potassium salts in the aqueous phase should be removed before
the extraction.

关键词: lithium;solvent extraction;tri-n-butyl phosphate;ferric chloride