E-pH图引导下低温短时硫酸浸出从高铝LiFePO4黑粉中高效回收锂和铁

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2025-07-25 DOI:10.1016/j.wasman.2025.115028

Ke Xu, Shengde Dong, Chunxi Hai, Luxiang Ma, Yanxia Sun, Qi Xu, Xin He, Yuan Zhou

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引用次数: 0

摘要

废旧锂离子电池正极材料的回收利用对资源利用和环境保护具有重要意义。然而，很少有研究解决了高铝LiFePO4黑粉（HALFP-BP）因预处理不足而带来的挑战。本研究提出了一种基于E-pH图热力学分析的低温短时硫酸浸出方法。在优化条件下，Li和Fe的浸出率可达99%，而Al的选择性去除率为86%。进一步分析了E-pH图在回收过程中的指导作用以及酸浸过程中的化学反应和吉布斯自由能分析。结果表明，在硫酸体系中，抑制铝杂质表面致密Al2O3膜的溶解动力学是实现选择性分离的关键。该方法为HALFP-BP的资源利用提供了一种节能高效的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

E-pH diagram-guided low-temperature short-time sulfuric acid leaching for efficient recovery of lithium and iron from high-aluminum LiFePO4 black powder

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E-pH diagram-guided low-temperature short-time sulfuric acid leaching for efficient recovery of lithium and iron from high-aluminum LiFePO4 black powder

The recycling of cathode materials in waste lithium-ion batteries is of great significance to resource utilization and environmental protection. However, few studies have addressed the challenges posed by high-aluminum LiFePO₄ black powder (HALFP-BP) resulting from inadequate pre-treatment. This study proposes a low-temperature short-time sulfuric acid leaching method based on thermodynamic analysis of E-pH diagrams. Under optimized conditions, the leaching efficiencies of Li and Fe reached 99 %, while 86 % of Al was selectively removed. Furthermore, the guiding role of E-pH diagram in the recovery process and the chemical reactions and Gibbs free energy analysis during the acid leaching process were analyzed. It revealed that the dissolution kinetics inhibition of the dense Al₂O₃ film on the surface of aluminum impurities in the sulfuric acid system was the key to achieving selective separation. This method provides an energy-saving and efficient solution for the resource utilization of the HALFP-BP.

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)