| Abstract Scope |
In this paper, the main phase composition, morphological characteristics and microstructure of the FeO-SiO2-V2O3-MgO-TiO2 vanadium slag were investigated using high-temperature phase equilibrium experiments combined with X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS) analysis and Raman spectroscopy. The results show that the vanadium slag is mainly composed of (Fe,Mg)V2O4, (Fe,Mg)2TiO4, (Fe,Mg)2SiO4 and MgSiO3. As the MgO content increases from 0 to 10.71%, the V element is always enriched in the spinel phase, and the Mg element is mainly enriched in the spinel and olivine phases, where the increase of Mg element 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 spinel size. A single Mg2SiO4 is generated with the increase of FeO/SiO2 in the high-Mg series vanadium slag. Raman characterization results indicate a network depolymerization effect of MgO. |