Isothermal reduction of titanomagnetite concentrates containing coal

摘要: The isothermal reduction of the Panzhihua titanomagnetite concentrates (PTC) briquette containing coal under argon atmosphere was investigated by thermogravimetry in an electric resistance furnace within temperature range 1250–1350°C. samples reduced at 1350°C for different time were examined X-ray diffraction (XRD) analysis. Model-fitting and model-free methods used to evaluate apparent activation energy reaction. It is found that rate very fast early stage, then, a later becomes slow decreases gradually end reduction. also observed PTC depends greatly on temperature. At high temperatures, degree reaches values faster final value achieved higher than low temperatures. phase composition PTC-coal consists iron ferrous-pseudobrookite (FeTi2O5), while Fe2.75Ti0.25O4, Fe2.5Ti0.5O4, Fe2.25Ti0.75O4, ilmenite (FeTiO3) wustite (FeO) are intermediate products. reaction controlled boundary less 0.2 with about 68 kJ·mol−1 three-dimensional diffusion greater 0.75 134 kJ·mol−1. For 0.2–0.75, mixed control, increases increase degree.