Vacuum carbothermal solid phase reduction of Panzhihua ilmenite concentrate
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Abstract:
The phase transformation and reduction process of vacuum carbothermal reduction ilmenite concentrate at the temperature from 1 000℃ to 1 400℃ were studied by using FactSage, XRD and BSE-EDS. The results showed that reduction temperature promoted the reduction reaction and the nucleation and growth of the metallic iron. The reaction was most intense at the temperature from 1 200℃ to 1 300℃. At 1 350℃, silicon entered the iron phase region. Except for a small amount of Fe2TiO4→FeTiO3 at the initial stage, the reduction process of ilmenite concentrate was basically carried out along the FeTiO3→FeTi2O5→Ti3O5→Ti2O3. Iron oxides were reduced to metallic iron and aggregated and grown, while titanium oxides changed from high valence to low valence. Finally, the main phases of the reduction were Ti2O3 and metallic iron. A solid solution of (Fe, Mg)TiO3 and M3O5 was formed during the reduction process, which restrained the reduction effect of iron.
