2016 Volume 56 Issue 8 Pages 1342-1351
TiO2, V2O5, and Cr2O3 are the three characteristic and valuable components of high-chromium vanadium-bearing titanomagnetite. The coupled effect of the three components during oxidation roasting is investigated in the work. The ordinary iron ore together with analytically pure TiO2, V2O5, and Cr2O3 is used to prepare pellet samples and two typical on-site iron ores are used to verify the analyses. TiO2, V2O5, and Cr2O3 in one-component pellet form iron titanium solid solution, single V2O3, and iron chromium solid solution respectively to destroy the integrity of hematite recrystallization and restrain a wide range of connected crystal. TiO2 is conductive to form high melting point slag and increase the amount of liquid slag. As increased TiO2, V2O5, and Cr2O3, the compressive strength (CS) of pellet decreases. The reduction swelling index (RSI) of pellet is improved by TiO2 but worsened by V2O5 and Cr2O3. The decrease of CS is aggravated seriously by the coupled effect of TiO2&V2O5, and RSI of TiO2&V2O5 pellet is higher than TiO2 pellet but lower than V2O5 pellet. CS of TiO2&V2O5&Cr2O3 pellets is worse than one-component TiO2, V2O5, and Cr2O3 pellet but better than TiO2&V2O5 pellet, which is attributed to the new generated vanadium chromium solid solution cutting down the destroy of single V2O3 grains and remitting the decrease of CS more or less. The verified analyses of two typical on-site iron ores indicate that the obtained coupled effects of valuable components in high-chromium vanadium-bearing titanomagnetite during oxidation roasting are credible.