Experimental Study on the Formation of V-Rich Spinel Phase in CaO-SiO{sub 2}-MgO-FeO{sub t}-Al{sub 2}O{sub 3}-V{sub 2}O{sub 3}-P{sub 2}O{sub 5} Slags at 1573 K (1300 °C)
- Anhui University of Technology, School of Metallurgical Engineering (China)
- University of Science and Technology Beijing, School of Metallurgical and Ecological Engineering (China)
To concentrate vanadium dissolved in steelmaking slag and to separate the obtained vanadium (V)-concentrating phase by a magnetic method, the mineral phases in a CaO-SiO{sub 2}-MgO-FeO{sub t}-Al{sub 2}O{sub 3}-V{sub 2}O{sub 3}-P{sub 2}O{sub 5} system at 1573 K (1300 °C) were characterized by scanning-electron microscopy-energy-dispersive spectroscopy and X-ray diffractometry. When the samples were equilibrated in a pure iron crucible and argon atmosphere, four phases were identified, namely, orthosilicate, V-bearing spinel, wüstite, and a glass phase. The orthosilicate, V-bearing spinel, and glass phase occurred in all samples, whereas wüstite appeared only in samples with a higher basicity or high FeO{sub t} content. The results indicate that the V-bearing spinel phase, which is analogous to Fe{sub 3}O{sub 4}, is a thermodynamically stable phase that is suitable for the enrichment of vanadium dissolved in slags. Further analysis reveals that the increases in contents of FeO{sub t} and MgO in slag favor spinel-phase formation. When the slags are saturated by the wüstite phase, almost all dissolved vanadium can be concentrated in the spinel phase.
- OSTI ID:
- 22933674
- Journal Information:
- Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science Journal Issue: 2 Vol. 50; ISSN 1073-5615; ISSN MTBSEO
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effects of Slag Composition on H{sub 2} Generation and Magnetic Precipitation from Molten Steelmaking Slag–Steam Reaction