Preparation of Battery-Grade FePO4·2H2O Using the Stripping Solution Generated from Resource Recycling of Bauxite Residue
2022
Zhang, Xuekai | Zhou, Kanggen | Zeng, Dewen | Li, Jia | Wu, Yehuizi | Chen, Wei | Peng, Changhong
A novel process for the high-value-use of iron from bauxite residue was proposed in this work. The process was trying to use the iron-containing stripping solution generated during resource recycling of bauxite residue to produce battery-grade FePO₄·2H₂O product. Thermodynamics calculation indicates that Fe and P in the stripping solution mainly existed in the form of FeHPO₄⁺, and the theoretical pH for the conversion reaction from FePO₄·2H₂O to Fe(OH)₃ was 1.72. The optimal condition for the synthesis of FePO₄·2H₂O using the stripping solution was determined as: reaction pH of 0.8, reaction temperature of 90°C, Fe/P ratio of 1, and reaction time of 24 h. XRD result showed that the synthesized FePO₄·2H₂O was well-crystallized and perfectly matched with the characteristic peaks of FePO₄·2H₂O. Moreover, all the parameters of the synthesized iron phosphate meet the quality requirements of battery precursor.
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