中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 6 June 2022 |
（1. Institute of Resource Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou 510650, China;
2. State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou 510650, China;
3. Guangdong Provincial Key Laboratory of Rare Earth Development and Application, Guangzhou 510650, China;
4. Guangdong Brunp Recycling Technology Co., Ltd., Foshan 528100, China）
Abstract:Oxidation pressure leaching was proposed to selectively dissolve Li from spent LiFePO4 batteries in a stoichiometric sulfuric acid solution. Using O2 as an oxidant and stoichiometric sulfuric acid as leaching agent, above 97% of Li was leached into the solution, whereas more than 99% of Fe remained in the leaching residue, enabling a relatively low cost for one-step separation of Li and Fe. And then, by adjusting the pH of leachate, above 95% of Li was recovered in the form of the Li3PO4 product through iron removal and chemical precipitation of phosphate.
Key words: spent LiFePO4 batteries; oxidation pressure leaching; separation; Li; Fe; lithium phosphate
