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Diffusion Behavior of Metal Cations at the Interface Between Rare Earth Orthophosphate and Calcium Oxide

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Abstract

The decomposition of monazite using calcium oxide is a clean metallurgy technique for the extraction of rare earth elements. The reaction mechanism between CaO and monazite was studied using the diffusion couple technique, while the interfaces under varying annealing temperatures and durations were characterized using X-ray diffraction, electron probe microanalysis, and energy-dispersive X-ray spectroscopy. The interdiffusion coefficients and diffusion activation energies of Ca and Ce in the diffusion layer were calculated, where the corresponding kinetic analysis indicated that the reaction between CePO4 and CaO was controlled by diffusion. The diffusion mechanism was further discussed based on the vacancy mechanism.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (Grant No. 51274061); and the National Program on Key Basic Research Project of China (Grant No. 2012CBA01205). Special thanks are due to the instrumental from Analytical and Testing Center, Northeastern University.

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110169, China

    Yan Zhou, Jianxing Liu, Gongjin Cheng, Xiangxin Xue, Hongrui Yue & He Yang

  2. Liaoning Key Laboratory of Metallurgical Resources Recycling Science, Shenyang, 110169, China

    Yan Zhou, Jianxing Liu, Gongjin Cheng, Xiangxin Xue, Hongrui Yue & He Yang

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  1. Yan Zhou
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  2. Jianxing Liu
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  3. Gongjin Cheng
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  4. Xiangxin Xue
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  5. Hongrui Yue
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  6. He Yang
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Correspondence to Xiangxin Xue, Hongrui Yue or He Yang.

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Manuscript submitted April 9, 2021; accepted November 4, 2021.

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Zhou, Y., Liu, J., Cheng, G. et al. Diffusion Behavior of Metal Cations at the Interface Between Rare Earth Orthophosphate and Calcium Oxide. Metall Mater Trans B 53, 816–828 (2022). https://doi.org/10.1007/s11663-021-02377-2

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  • DOI: https://doi.org/10.1007/s11663-021-02377-2

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