Tri-ri-butyl phosphate (TBP) dissolved in kerosene was chosen as extractant for lithium from a model brim 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 i at 20-25 degrees C i [Fe3+]/[Li+] about 1.5-2.0 i TBP concentration 50%-70% i [MgCl2] exceeding 3 mol.L-1 i pH about 2 i while most sodium and potassium salts in the aqueous phase should be removed before the extraction.