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Precipitation of Rare Earth Slag and the Crystallization Behavior of Rare Earth Phase

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Abstract

Isothermal reduction experiments at 1400 °C, which used carbon-bearing pellets mainly made from Bayan Obo complex iron ore and pulverized coal, could effectively separate rare earth (RE) slag and iron. Different instruments were used to study the precipitation of RE slag and the growth behavior of the RE phase in RE slag during the process of cooling from 1400 °C. The experimental results show the presence of three main phases in the RE slag—the RE phase (Ca, Ce, La)5(SiO4)6F, cuspidine (Ca4Si2O7F2), and fluorite (CaF2), which precipitated at 1352 °C, 1218 °C, and 1045 °C, respectively. The RE phase grew along a specific growth track and finally manifested with a hollow hexagon morphology. The edge nucleation layer-by-layer growth model was applied to explain the formation of the hollow crystal structure. Further, the growth kinetics of the RE phase formation from molten slag were also described.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51874029), the National Heavy Industry Self-owned Fund (No. 41617015), and the Undergraduate Innovation Fund (No. 1917004)

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Wanli Yi, Xuefeng She, Huai Zhang, Zhenlong An, Jingsong Wang & Qingguo Xue

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  1. Wanli Yi
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  2. Xuefeng She
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Correspondence to Xuefeng She.

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Manuscript submitted August 13, 2020; accepted January 12, 2021.

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Yi, W., She, X., Zhang, H. et al. Precipitation of Rare Earth Slag and the Crystallization Behavior of Rare Earth Phase. Metall Mater Trans B 52, 1095–1105 (2021). https://doi.org/10.1007/s11663-021-02081-1

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  • DOI: https://doi.org/10.1007/s11663-021-02081-1

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