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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 63, Number 6
JKCSEZ 63(6)
December 20, 2019 

 
Title
Recovery of Rare Metals from the Waste Secondary Lithium Ion Battery Cathode Active Materials Using Lactic Acid and Oxalic acid

젖산과 옥살산을 이용한 폐 이차 리튬이온 전지 양극 활물질로부터 희유금속들의 회수
Author
Younjung Kim, Ji Sun Han, Sik Young Choi, In Gyung Oh, Yong Pyo Hong, Keon Sang Ryoo*

김연정, 한지선, 최식영, 오인경, 홍용표, 유건상*
Keywords
양극활물질, 젖산, 옥살산, 희유금속, 다핵 결정성 ,  Cathode active material, Lactic acid, Oxalic acid, Rare metal, Polynuclear crystalline
Abstract
젖산을 이용하여 안전하게 양극활물질에 있는 Co, Mn, Ni을 침출할 수 있는 방법을 개발하였다. 양극활물질을 젖산으 로 침출 시켰을 때, 젖산의 농도는 1N과 4 N 이상에서 보다는 2 N에서 가장 높은 효율을 보였다. 양극활물질을 단계적으로 젖 산 용액에 첨가 하였을 때, 최대 용해도는 2 N의 젖산 용액에서 1 L 당 30 g이었다. 젖산 용액에 옥살산을 첨가하였고 희유금속 들은 1 L 당 4 g에서 가장 경제적인 회수율을 보였다. 본 연구를 바탕으로 해서, 양극활물질로부터 희유금속들을 회수하기 위한 최적의 조건은 무게비로 옥살산과 양극활물질이 7 : 1이라는 것을 확인할 수 있었다. 첨가하여, 옥살산에 의해서 생성된 침전물 은 Co, Ni, Mn 3성분이 결합되어 있는 다핵 결정성 물질이었다.

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.

Page
446 - 439
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