The isothermal reduction kinetics of chromium-bearing vanadium-titanium magnetite sinter

The reduction of chromium-bearing vanadium-titanium magnetite sinter (CVTMS) by CO was investigated at 1123-1223 K. The reduction degree increased with increasing temperature. The isothermal reduction kinetics of CVTMS was analysed, according to Sharp analysis and ln-ln analysis, the kinetic mechanism of reduction process for all samples in different basicity can be represented as f(alpha) = 1.61(1-alpha)[-ln(1-alpha)](1-1/1.61). The reaction activation energy of all samples (R = 1.9, 2.1, 2.3, obtained according to the components of the materials burdening used in sintering process) at different reaction degrees were calculated by the model-free method. And the pre-exponential factors of reaction also were calculated by the mathematical method. The rate controlling step for the reduction process under the present reduction condition was chemical reaction.