Appropriate titanium slag composition during smelting of vanadium titanomagnetite metallized pellets
(School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract: The suitable titanium slag composition with high titanium content for electric furnace smelting of vanadium titanomagnetite was investigated through thermodynamics and related phase diagram analysis. According to the thermodynamic results, low-melting-point regions and MgTi2O5 primary phase area in the phase diagrams, the suggested titanium slag composition for the present vanadium titanomagnetite metallized pellets should consist of 50% TiO2, 8%-12% MgO and 13% Al2O3 (mass fraction) with a binary basicity of 0.8-1.2. Finally, the verified smelting experiments were conducted and successful separation of the molten iron from the titanium slag is obtained. The obtained vanadium-containing molten iron contains 0.681% V and 0.267% Ti, and the obtained titanium slag contains 52.21% TiO2 (mass fraction), in which MgTi2O5 is the primary phase. The titanium resource in the final titanium slag production could be used to produce TiO2 pigment by acid leaching methods.
Key words: vanadium titanomagnetite; electric furnace; basicity; MgO; MgTi2O5; titanium slag composition