Experimental Study on the Formation of V-Rich Spinel Phase in CaO-SiO2-MgO-FeOt-Al2O3-V2O3-P2O5 Slags at 1573 K (1300 °C)
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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-SiO2-MgO-FeOt-Al2O3-V2O3-P2O5 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 FeOt content. The results indicate that the V-bearing spinel phase, which is analogous to Fe3O4, 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 FeOt 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.
The financial supports from the National Natural Science Foundation of China through Project No. 51774001 and 51534001, as well as Project from the Ministry of Human Resources and Social Security of the People’s Republic of China, are gratefully acknowledged.
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