Abstract
The pre-oxidation of Panzhihua ilmenite concentrate was investigated at 1073 K and 1273 K under air atmosphere. The products of the pre-oxidation at 1073 K were Fe2O3, TiO2 and Fe2Ti3O9, while Fe2O3, TiO2 and Fe2TiO5 at 1273 K. The influences of pre-oxidation on the carbothermic reduction were studied at 1473 K, 1573 K, 1673 K and 1773 K under argon atmosphere. It was found that the main phases during the reduction process were Ti3O5, Fe, Fe3C, Ti2O3 and TiCxOy. The pre-oxidation was beneficial to the formation of TiCxOy phase compared to the direct carbothermic reduction without pre-oxidation. And the pre-oxidation at 1273 K was better for the carbothermic reduction than pre-oxidation at 1073 K. The rate controlling steps for the carbothermic reduction obeyed the diffusion model. After being reduced for 2 h at 1773 K, the product was changed to TiC with only little O content.
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