Extraction of Lithium from Magnesium-Rich Solution Using Double Metal Salts as Co Extraction Reagents

Abstract

In this study, a new extraction system NaPF₆ + NaClO₄ + TBP has nearly the same extraction efficiency of Li⁺ as the NaPF₆ + TBP system, and nearly the same stripping efficiency of Li⁺ as NaClO₄ + TBP system. The effect of NaClO₄ and NaPF₆ concentration, and phase ratio on extraction efficiency was investigated. At the optimal conditions, the single extraction efficiency of Li⁺ is 77.1%. The stripping efficiency of Li⁺ reaches 90.7% using pure water as a stripping agent with the volume ratio of the aqueous phase to the organic phase (A/O) of 3. TBP + NaPF₆ + NaClO₄ system has great potential in Li⁺ extraction from Mg²⁺ rich solution.