Phase coexistence relationship of CaO-Al2O3-V2O5 slag system
CaO-Al2O3-V2O5 slag system is a basic metallurgical slag system for denitrification of liquid steel.The lack of thermodynamic information,such as the phase equilibrium relationship,limits the re-search and development of related slag systems.In this paper,the phase equilibrium relationship of CaO-Al2O3-V2O5 slag system was studied through high temperature phase equilibrium experiment,combined with scanning electron microscope and energy spectrum analysis.According to the experimental results,the phase equilibrium relationship of CaO-Al2O3-V2O5 slag line at 1 600 ℃ in air atmosphere was de-termined,and the isothermal cross section of CaO-Al2O3-V2O5 slag line within the whole component range of the system is drawn,including 7 equilibrium phase regions,i.e.,Liquid+Al2O3+CaAl12O19,Li-quid+CaAl12O19+CaAl4O7,Liquid+CaO,Liquid+Al2O3,Liquid+CaAl12O19,Liquid+CaAl4O7 and single liquid phase region.The determination of equilibrium phase regions between the above phases can real-ize the division of independent sub-systems of the phase diagram of the CaO-Al2O3-Ce2O3 slag system,and can also provide support for the subsequent high-temperature phase diagram drawing of the slag system.
steelmakingCaO-Al2O3-V2O5 slag systemphasehigh temperature phase equilibrium ex-periment
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