Preparation of FePO4x2H2O from LiFePO4 mixed with LiNixCoyMn1–x–yO2 waste material

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Published: May 21, 2020
DOI: https://doi.org/10.2298/JSC190916005T
Keywords:
spent materials complexing preparation FePO4 2H2O

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Honghui Tang
School of Metallurgy and Environment, Central South University, 410083 Changsha, Hunan Hunan Brunp Recycling Technology Co., Ltd 410600 Ningxiang, Hunan
Yanchao Qiao
Hunan Brunp Recycling Technology Co., Ltd 410600 Ningxiang, Hunan
Xi Dai
School of Metallurgy and Environment, Central South University, 410083 Changsha, Hunan
Feng Tan
Hunan Brunp Recycling Technology Co., Ltd 410600 Ningxiang, Hunan
https://orcid.org/0000-0001-7055-9756
Qiang Li
Hunan Brunp Recycling Technology Co., Ltd 410600 Ningxiang, Hunan

Abstract

A method for preparing battery grade FePO4×2H2O from LiFePO4 and LiNixCoyMn1-x-yO2 mixed waste is proposed. The optimum leaching con­ditions included: temperature of 50 °C, 3:1 liquid–solid mass ratio, 3.6 HCl/FePO4×2H2O mole ratio, 0.75 H2O2/FePO4×2H2O mole ratio, and 2 h reaction time. The solution obtained from the leaching waste material was diluted to a 1.0 M Fe concentration, then transferred to an 1 L beaker, where temperature, pH, complexing agent, ammonia addition rate and feeding mode were studied in order to determine their effects on the precipitation, particle size and mor­pho­logy of FePO4×2H2O. High precipitation rate of Fe with low percentages of Al, Ni, Co, Mn in the FePO4×2H2O is achievable when preci­pit­ation is per­formed at a temperature of 85 °C, pH of 2.0, and 20 g L-1 com­plexing agent. Furthermore, it was observed that a slow addition of ammonia and a flow feed­ing method contributed to the production of FePO4×2H2O, with small particle sizes and a flake morphology.

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[1]
H. Tang, Y. Qiao, X. Dai, F. Tan, and Q. Li, “Preparation of FePO4x2H2O from LiFePO4 mixed with LiNixCoyMn1–x–yO2 waste material”, J. Serb. Chem. Soc., vol. 85, no. 5, pp. 671–685, May 2020.
Issue
Vol. 85 No. 5 (2020)
Section
Materials

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