Influence of MgO on the oxidation and induration of Hongge vanadium titanomagnetite pellets

ABSTRACT

As part of the development of a novel and clean smelting process for the comprehensive utilization of Hongge vanadium titanomagnetite (HVTM), the objective of this study was to investigate the influence of MgO on the oxidation and induration of HVTM pellets (HVTMP). The results showed that the oxidation degree and compressive strength decreased significantly with the increase in added MgO, which corresponded to the increase in porosity. MgO reacted with Fe₂O₃ to form Mg–Fe solid solution. The evolution in microstructure was explained by the interactions between MgO and Fe₂O₃ at the grain boundaries. Mg²⁺ diffusion affected the oxidation and induration, and cracks were formed, resulting in the uneven distribution of grains and the inhibition of hematite recrystallization. Furthermore, the grain size decreased significantly. Based on the results, we proposed a diagram to describe the mechanism, which showed that MgO had a negative effect on the oxidation and induration of HVTMP.

KEYWORDS:

• Magnesium
• Hongge vanadium titanomagnetite
• oxidation and induration
• porosity
• grain size

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work is financially supported by the Fundamental Research Funds for the Central Universities [grant number N182503032]; National Natural Science Foundation of China [grant number 51574067]; Postdoctoral International Exchange Program (Dispatch Project).