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Phase Relations of the CaO-SiO2-Nd2O3 System and the Implication for Rare Earths Recycling

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Abstract

CaO-SiO2-Nd2O3 slags were equilibrated at 1773 K and 1873 K (1500 °C and 1600 °C) for 24 hours in Ar, and quenched in water to determine the operative phase relations. The composition and crystallinity of the phases in equilibrium were determined by EPMA-WDS and EBSD, respectively. Based on these analyses, the liquid stability region was accurately determined, and a large part of the isothermal section of the phase diagram was constructed. Data resulting from this work can be used to generate a thermodynamic database for rare-earth oxide-containing systems and to support further investigation on separation of rare earths from metallurgical slags or other residues through high-temperature processing.

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Acknowledgments

The authors acknowledge the support from the Hercules Foundation (Project No. ZW09-09) in the use of the FEG-EPMA and FEI-Nova Nanosem system and from the GOA/13/008 project at the KU Leuven.

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Authors and Affiliations

  1. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, Bus 2450, 3001, Heverlee, Leuven, Belgium

    Thu Hoai Le, Annelies Malfliet, Bart Blanpain & Muxing Guo

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  1. Thu Hoai Le
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  2. Annelies Malfliet
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  3. Bart Blanpain
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  4. Muxing Guo
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Correspondence to Thu Hoai Le.

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Manuscript submitted December 1, 2015.

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Le, T.H., Malfliet, A., Blanpain, B. et al. Phase Relations of the CaO-SiO2-Nd2O3 System and the Implication for Rare Earths Recycling. Metall Mater Trans B 47, 1736–1744 (2016). https://doi.org/10.1007/s11663-016-0634-9

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  • DOI: https://doi.org/10.1007/s11663-016-0634-9

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