Study on Lithium Extraction from Spent Lithium Iron Phosphate Cathode Materials by Mechanochemical Activation Using Heterocrystalline Sulfate and Water Leaching AITranslate

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Chinese Library Classification Number:TF803.2[冶金工程—有色金属冶金]

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Lithium in spent LiFePO4cathode materials was recovered by the mechanochemical activation and water leaching process,and the effects of the molar ratio of co-grinding reagents to the spent LiFePO4cathode materials,the speed and time of ball milling on leaching rate of lithium were studied.Under the conditions that the molar ratio of four heterocrystalline sulfate co-grinding reagents to the spent LiFePO4cathode materials is 3∶1,the ball milling speed is 400 r/min,and the ball milling time is 4 h,lithium leaching rates with the co-grinding reagents of Na₂S₂O₃,Na₂SO₃,Na₂SO₄and Na₂S₂O₈are 42.7%,30.8%,58.3%and 99.3%,respectively.Relatively high leaching rate of lithium is achieved when using Na₂S₂O₈as the co-grinding reagent to recover lithium by mechanochemical activation and water leaching.Lithium in the filtrate was then precipitated,separated and purified by saturated Na₂CO3solution to obtain the recovered product Li2CO3with a purity of up to 98.5%.The method realizes the efficient recovery of valuable lithium metal from spent LiFePO4cathode materials.