Phase equilibria in low basicity region of CaO-SiO_2-Nb_2O_5-(5 wt%,10 wt%,15 wt%) La_2O_3 system |
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| Affiliation: | 1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Shenyang 110819, China;2. School of Metallurgy, Northeastern University, Shenyang 110819, China;1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University, Shenyang 110819, China;2. School of Metallurgy, Northeastern University, Shenyang 110819, China;3. Department of Materials Engineering, KU Leuven, Leuven 3000, Belgium;1. Mining Research Institute, Inner Mongolia University of Science & Technology, Baotou 014010, China;2. Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources, Ministry of Education, Baotou 014010, China;1. Institute of Iron and Steel Technology, TU Bergakademie Freiberg, Germany;2. Institute of Ceramics, Refractories and Composite Materials, TU Bergakademie Freiberg, Germany;3. Institute of Materials Science, TU Bergakademie Freiberg, Germany;4. Tokyo Institute of Technology, Department of Metallurgy and Ceramics Science, Tokyo, Japan |
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| Abstract: | The lack of thermodynamic information,such as primary phase fields and liquidus temperatures,in the CaO-SiO_2-Nb_2O_5-La_2O_3 quaternary system phase diagram has restricted the comprehensive utilization of the niobium(Nb) and rare earth(RE) resources.In this work,the phase equilibria in low basicity region(w(CaO)/w(SiO_2)1) of CaO-SiO_2-Nb_2O_5-(0-15 wt%)La_2O_3 system at 1373-1873 K were experimentally studied by thermodynamic equilibrium experiment,and then,the results were analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM),and energy dispersive spectrometry(EDS).Additionally,an optimized method was proposed to process the compositions of equilibrium liquid phases at different temperatures.According to the experimental results,the univariate line between CaNb_2O_6,SiO_2 and LaNbO_4 primary phase fields,interface between CaNb_2O_6 and SiO_2 primary phase fields and isothermal liquidus surfaces in SiO_2 primary phase field were determined.Finally,the spatial phase diagram of CaO-SiO_2-Nb_2O_5-La_2O_3 within specific region was constructed,and furthermore,the phase diagram was also presented in CaO-SiO_2-Nb_2O_5 pseudo-ternary system with w(La_2O_3)=5 wt%,10 wt% and 15 wt%.The research results have guiding significance for the improvement of related phase diagram and the comprehensive utilization of Nb and RE resources. |
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| Keywords: | Phase equilibria Liquidus surface Primary phase field Rare earths |
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