Study on Separation of Lithium from Sodium in Lithium-Containing Sodium Sulfate Solution Using a Synergistic Extraction System of LIX54 and Cyanex923 AITranslate

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Chinese Library Classification Number:TF826.3[冶金工程—有色金属冶金]

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Aiming at the problems of low lithium recovery efficiency and difficult lithium-sodium separation in the current wet recycling process of spent battery cathode materials,a synergistic extraction system of LIX54/Cyanex923 was proposed for the selective extraction of lithium from lithium-containing sodium sulfate solution.The experimental results show that for the synthetic feed solution containing 0.5 g/L Li and 50 g/L Na,98.72%of lithium in a single contact is extracted by the organic phase consisting of 0.4 mol/L LIX54,0.2 mol/L Cyanex923,and sulfonated kerosene with an O/A ratio of 1∶1 and equilibrium pH of 12.5 at 30℃for 10 min,resulting in a separation factor of lithium from sodium reaching 1578.After three-stage simulated counter-current extraction at an O/A ratio of 1∶5 and equilibrium pH of 12.5,over 99%of lithium is extracted,leaving less than 0.01 g/L Li in raffinate.After two-stage counter-current scrubbing with 1 mol/L HCl at an O/A ratio of 8∶1,nearly 98%sodium is elated,leaving 0.05 g/L Na in the organic phase.After two-stage counter-current scrubbing with 1 mol/L HCl at an O/A ratio of 8∶1,nearly 98%sodium is eluted,leaving 0.05 g/L Na in the organic phase.After scrubbing,the loaded organic phase undergoes two-stage counter-current stripping with 3 mol/L HCl at an O/A ratio of 6∶1.The stripping rate of lithium reaches over 99%and the lithium concentration is enriched up to 16.93 g/L in the strip liquor.The LIX54/Cyanex923 synergistic extraction system can effectively recover lithium from lithium-containing sodium sulfate solution selectively and realize the deep separation of lithium from sodium and the enrichment of lithium at high magnification.