Abstract
The recovery of rare earth elements from metallurgical slags containing rare earths is an important topic. The crystallization behavior of CaO-SiO2-CaF2-CeO2 system with CeO2 content range from 12 to 16 mass pct and a constant CaO/SiO2 ratio of 1 has been examined by using a confocal laser scanning microscope (CLSM). Diagram of continuous cooling transformation and that of isothermal (time temperature) transformation for the slag have been constructed to characterize the solidification behavior of the slag with cooling rates between 3.125 and 100 K/minutes and temperature between 1373 and 1598 K. Depending on the CeO2 content in the slag, the primary crystalline phase of CaO-SiO2-CaF2-CeO2 system precipitates with elongated needle-like or short and rod-like crystals. The XRD analyses of crystalline phase of solidified slags confirm that the primary crystalline phase is a rare earth-rich phase Ca2Ce8O2(SiO4)6, which contains no fluoride.
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© 2016 TMS (The Minerals, Metals & Materials Society)
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Zhao, Z. et al. (2016). In-Situ Studies on the Crystallization of CaO-SiO2-CaF2-CeO2 System by a Confocal Laser Scanning Microscope. In: Reddy, R.G., Chaubal, P., Pistorius, P.C., Pal, U. (eds) Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016. Springer, Cham. https://doi.org/10.1007/978-3-319-48769-4_24
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DOI: https://doi.org/10.1007/978-3-319-48769-4_24
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48625-3
Online ISBN: 978-3-319-48769-4
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