Key Laboratory for Ecological Utilization of Multimetallic Mineral (Ministry of Education), Northeastern University School of Materials & Metallurgy，Northeastern University Shenyang School of Materials & Metallurgy，Northeastern University Shenyang School of Materials & Metallurgy，Northeastern University Shenyang School of Materials & Metallurgy，Northeastern University Shenyang Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University
Abstract：Rutile, ilmenite and Al powder (or Al-Mg alloy) were used to prepare high titanium ferroalloy. The adiabatic temperatures of different reaction systems and the Gibbs free energy changes of relative reactions on TiO2-Al system and TiO2-Mg systems were calculated. The reaction kinetics of the systems was studied by DTA. The high titanium ferroalloy was characterized by XRD, SEM and electron microprobe. The results indicate that the adiabatic temperatures of all reaction systems are higher than 1800 K so all the reactions can be kept spontaneously. The content of oxygen and inclusions in the alloy can be controlled to lower level when Al-Mg alloy is used to reduce TiO2. The apparent activation energy is 164.497 kJ/mol and reaction order 0.414 when Al reduces TiO2. The apparent activation energy is 383.235 kJ/mol and reaction order 0.591 when Mg reduces TiO2. The high titanium ferroalloy consists of Al2O3, TiO2, Ti2O, Fe2TiO4, and Ti9Fe3 (Ti0.7Fe0.3)O3 complex phases. The oxygen content in the ferroalloy is up to 12.20%.
2010, Vol. 10 
