Coupled Effect of Valuable Components in High-Chromium Vanadium-bearing Titanomagnetite during Oxidization Roasting

抄録

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.