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KMID : 1059520190630060446
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Journal of the Korean Chemical Society
2019 Volume.63 No. 6 p.446 ~ p.452
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Recovery of Rare Metals from the Waste Secondary Lithium Ion Battery Cathode Active Materials Using Lactic Acid and Oxalic acid
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Kim Youn-Jung
Han Ji-Sun
Choi Sig-Young
Oh In-Gyung
Hong Yong-Pyo
Ryoo Keon-Sang
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Abstract
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We have developed a method that can leach Co, Mn, and Ni in the cathode active material safely using lactic acid. When cathode active material was leached by lactic acid, lactic acid showed the highest efficiency at 2 N than 1 N and above 4 N concentration. When the cathode active material was added incrementally into the solution of lactic acid, the maximum solubility was 30 g/L at 2 N concentration. Oxalic acid was added in the solution of lactic acid and it showed that rare metals represent the most economical recovery efficiency at 4 g/L. Based on this study, it was found that the optimal condition for recovery of rare metals from cathode active material is oxalic acid : cathode active material = 7 : 1 as a ratio of weight. In addition, it was observed that the precipitate produced by oxalic acid is a polynuclear crystalline material bonded with 3 components of Co, Ni, and Mn.
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KEYWORD
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Cathode active material, Lactic acid, Oxalic acid, Rare metal, Polynuclear crystalline
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