溶解
浸出(土壤学)
化学
磷酸盐
硫化物
磷
磷酸铁锂
溶解度
无机化学
磷酸铁
锂(药物)
毒性特征浸出程序
化学工程
电化学
环境科学
有机化学
金属
电极
物理化学
土壤科学
土壤水分
内分泌学
工程类
医学
作者
Kai He,Zhiyuan Zhang,Fu-Shen Zhang
标识
DOI:10.1016/j.jhazmat.2020.122614
摘要
Recovery of high-content and valuable elements including phosphorus (P) is critical for recycling of spent LiFePO4 battery, but P recovery is challengeable due to the poor solubility of lithium phosphate and iron phosphate. This study compared two strategies to recover P by adopting sulfide salt to induce P dissolution, i.e., recovery of P directly from LiFePO4, and step-by-step recovery of Li then P. The results revealed that the second strategy was more efficient because of the higher recovering efficiency and selectivity. Accordingly, an acid-free process to recover P was successfully demonstrated. Li-recovery efficiency of 97.5 % was reached at a leaching time of 65 min, and nearly 100 % P-recovery efficiency was reached at 5 h. Mechanism analysis revealed that the transforming of delithiated LiFePO4 crystal to NaFeS2 was mainly responsible for P dissolution. Thermodynamic analysis and density functional theory calculation further proved the transformation reaction, and a stepwise-transformation mechanism was proposed. In addition, P was reclaimed in the form of soluble phosphate salts. The process is especially appealing due to its environmental and economic benefits for recycling spent LiFePO4 batteries.
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