Fluoride ion-mediated differential coordination separation of Al (III) and Fe (III) for regeneration of low-aluminum, high-purity battery-grade iron phosphate

IF 11.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling Pub Date : 2025-05-23 DOI:10.1016/j.resconrec.2025.108404

Fei Han , Yaohui Xie , Lin Qu , Zhenzhou Wang , Wei Zhang , Guang Yang , Huiqin Hu , Meiting Huang , Haoxuan Yu , Liming Yang , Xubiao Luo

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引用次数: 0

Abstract

Deep removal of trace aluminum from lithium extraction slag (LES) is key to recovering high-purity battery-grade iron phosphate (FePO₄). Existing methods exhibit low aluminum removal due to the close solubility product constants of Al (III) and Fe (III). In this work, we propose a novel strategy for trace aluminum removal based on fluoride ion-mediated differential coordination of Al (III) and Fe (III). Through precise control of fluoride ion concentration in phosphoric acid solution, iron preferentially precipitates while aluminum predominantly forms soluble fluoride complexes. This distinct behavior enables precise elemental separation through fluoride content optimization. The developed separation technology achieved aluminum removal rate of 98.89 %. It is noteworthy that the aluminum content of precipitated FePO₄ is below 30 ppm, which meets the standard of battery-grade. This work provides a viable technical pathway for the industrialization of Al/Fe separation in the lithium extraction slag leachate and the regeneration of low-Al, high-purity FePO₄.

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氟离子介导的Al （III）和Fe （III）差配分离再生低铝高纯电池级磷酸铁

从锂提取渣中深度脱除微量铝是回收高纯度电池级磷酸铁的关键。由于Al （III）和Fe （III）的溶解度产物常数接近，现有方法的铝去除率较低。在这项工作中，我们提出了一种基于氟离子介导的Al （III）和Fe （III）的差异配位的新型微量铝去除策略。通过对磷酸溶液中氟离子浓度的精确控制，铁优先析出，而铝主要形成可溶性氟配合物。这种独特的行为通过优化氟化物含量实现了精确的元素分离。所开发的分离工艺的铝去除率可达98.89%。值得注意的是，沉淀的FePO4铝含量在30ppm以下，符合电池级标准。本研究为提锂渣渗滤液Al/Fe分离产业化及低铝高纯FePO4再生提供了可行的技术途径。

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.