Abstract: To recover lithium metal from cathode active material LiFePO4/C powder in spent lithium iron phosphate batteries,main ions in the hydrochloric acid leaching solution of LiFePO4/C powder are Li+,Fe3+ and a small amount of Cl-,which accords with the theoretical basis that there must be transition metal ions and Cl- when TBP extracts Li+.The mechanism for TBP to extract Li+,and the influences of chloride iron supply agent,Fe3+/Li+ molar ration,Cl- concentration and Li+ concentration on extraction are explored,and the optimal extraction separation conditions for Li+ are obtained.Study results show that using FeCl3+AlCl3 as chloride ion supplier,Li+ in the simulated acid leaching solution is extracted in the complex form of [LiFeCl4]·nTBP.The optimal extraction conditions for TBP to extract Li+ are as follows:the molar ratio of Fe3+/Li+ in the solution is 1.5,Cl- concentration is 5 mol·L-1,the mass concentration of Li+ is 1 g·L-1.When the ratio of organic phase and aqueous phase (O/A) is 0.5,under the optimal conditions,the secondary extraction rate of Li+ in LiFePO4/C powder hydrochloride acid leaching solution by TBP exceeds 92%;Stripping rate of Li+ is around 93% after three-stage of stripping with 6 mol·L-1 hydrochloride acid as stripping agent,and the mass fraction of impurities such as Fe3+ in the organic phase is less than 1% after stripping.This method enables the separation rate of lithium from spent lithium iron phosphate battery to exceed 83%,achieving the regeneration of lithium resources in spent lithium iron phosphate batteries.
王艺博, 阮久莉, 郭玉文, 姚扬, 李妍林. TBP为萃取剂分离废磷酸铁锂电池中金属锂的研究[J]. 现代化工, 2021, 41(7): 185-190.
WANG Yi-bo, RUAN Jiu-li, GUO Yu-wen, YAO Yang, LI Yan-lin. Separation of lithium metal from spent lithium iron phosphate batteries with TBP as extractant. Modern Chemical Industry, 2021, 41(7): 185-190.
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