Effect of MgO on Mineral Phase and Structure of Vanadium Slag

In this paper, the main phase composition and morphological characteristics of the FeO–SiO2–V2O3–MgOMgO–TiO2 vanadium slagVanadium slag system were investigated using high-temperatureTemperature phase equilibrium experiments combined with X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS) analysis and Raman spectroscopyRaman spectroscopy. The results show that the vanadium slagVanadium slag is mainly composed of (Fe, Mg)V2O4, (Fe, Mg)2TiO4, (Fe, Mg)2SiO4, and MgSiO3. As the MgOMgO content increases from 0 to 10.71%, V is always enriched in the spinelSpinel phase, and Mg is mainly enriched in the spinelSpinel and olivine phases, where the increase of Mg content causes a high-angle shift of the characteristic peak of the olivine phase on the XRD spectral peak. The increase of FeO/SiO2 (2, 3, 4, respectively) favors the growth of spinelSpinel size. A single Mg2SiO4 is generated with the increase of FeO/SiO2 in the high-magnesiumMagnesium vanadium slagVanadium slag. And the results suggest a network depolymerizationNetwork depolymerization effect of MgOMgO.