Selective removal of magnesium from lithium-rich brine for lithium purification by synergic solvent extraction using β-diketones and Cyanex 923.

studied the extraction of Mg from a synthetic brine solution (19.5 g L −1 Mg and 0.021 g L −1 Li) for the separation of Mg and Li using saponified D2EHPA, but the co‐extraction of Li was quite significant. 19 Virolainen et al. compared the performance of D2EHPA and Versatic Acid 10 (a mixture of branched carboxylic acids with the common structural formula of C 10 H 20 O 2 ) for the removal of Ca and Mg from a synthetic concentrated brine (26.0–34.0 g L −1 Li, 1.14–1.55 g L −1 Ca and 0.045–0.075 g L −1 Mg) for purification of Li. 16 It was found D2EHPA and Versatic Acid 10 overall performed similarly, but D2EHPA had a higher metal loading capacity, while Versatic Acid 10 had a better Mg/Li selectivity.

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