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<p>Using the ferric phosphate slag, a by-product produced in the production of ferric phosphate, the precursor material for the lithium battery positive electrode, this paper investigated a green recycling process for the high value-added product iron phosphate dihydrate (FePO₄·2&#xa0;H₂O). The product was prepared by acid leachation-copitation process. The effects of the acid dissolution stage (acid concentration, temperature, liquid-solid ratio (L/s), stirring rate) and the co-precipitation stage (precipitation temperature, aging time, pH value) on the morphology and particle size of the product were mainly investigated. The optimal process conditions for leaching iron phosphate slag: sulfuric acid concentration is 6&#xa0;M, dissolution temperature is 80℃, liquid-solid ratio is 6:1 and stirring rate is 100 r/min. The conditions for co-precipitation to produce FePO₄·2&#xa0;H₂O particles are as follows: pH value of 2, temperature at 70℃ and aging time of 2&#xa0;h. SEM and XRD tests indicated that it has good crystallinity and uniform particle distribution, meeting the requirements of the precursor for cathode materials used in lithium-ion batteries.</p>

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Preparation of FePO₄·2 H₂O by sulfuric acid leaching and co-precipitation of phosphorus-iron slag

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Chao Liu,
  • Pengjun Li,
  • Xiaolong Fu,
  • Yingxin Liu,
  • Guojun Zha,
  • Hongzhi Luo,
  • Yanmin He

摘要

Using the ferric phosphate slag, a by-product produced in the production of ferric phosphate, the precursor material for the lithium battery positive electrode, this paper investigated a green recycling process for the high value-added product iron phosphate dihydrate (FePO₄·2 H₂O). The product was prepared by acid leachation-copitation process. The effects of the acid dissolution stage (acid concentration, temperature, liquid-solid ratio (L/s), stirring rate) and the co-precipitation stage (precipitation temperature, aging time, pH value) on the morphology and particle size of the product were mainly investigated. The optimal process conditions for leaching iron phosphate slag: sulfuric acid concentration is 6 M, dissolution temperature is 80℃, liquid-solid ratio is 6:1 and stirring rate is 100 r/min. The conditions for co-precipitation to produce FePO₄·2 H₂O particles are as follows: pH value of 2, temperature at 70℃ and aging time of 2 h. SEM and XRD tests indicated that it has good crystallinity and uniform particle distribution, meeting the requirements of the precursor for cathode materials used in lithium-ion batteries.