摘要
Tri-n-butyl phosphate（TBP）dissolved in kerosene was chosen as extractant for lithium from a modelbrine having high magnesium-to-lithium ratio and ferric chloride was added to the system.The influences of con-tact time,concentration of the extractant,concentrations of some salts(Mg<sup>2+</sup>, Na<sup>+</sup>,K<sup>+</sup>)in the solution,acid-ity of hydrochloric acid and extraction temperature on the exttaction of lithium with TBP-kerosene system werestudied.The suitable extraction conditions were found to be:contact time not any less than 20min;at 20-25C;[Fe<sup>+3</sup>]/[Li<sup>+</sup>]about 1.5-2.0;TBP concentration 50%-70%;[MgCl<sub>2</sub>]exceeding 3 mol·L<sup>-1</sup>;pH about 2;while most sodium and potassium salts in the aqueous phase should be removed before the extraction.
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 20min; 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 .
