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采用等温还原试验并结合热力学反应数据,对钒钛铁精矿内配碳球团直接还原的还原反应进行了分析。以还原反应发生10 min为边界点,将反应过程分为前期和后期两个阶段,建立了还原过程的动力学模型。结果表明,钒钛铁精矿内配碳球团直接还原的还原度随反应温度的升高而增大。温度越高,球团在反应前期还原度的增加速率越大,达到的最终还原度越高,且达到最终还原度时所用的时间越短;还原前期为化学反应控制,反应活化能为73.17 kJ/mol。后期为扩散控制,反应活化能为152.02 kJ/mol。还原后期反应速度小于前期反应速度。
The isothermal reduction test and thermodynamic reaction data were used to analyze the reduction of vanadium-titanium concentrate with direct reduction of carbon pellets. The reduction reaction took place for 10 min as the boundary point. The reaction process was divided into two stages: pre-stage and post-stage, and the kinetic model of the reduction process was established. The results show that the reducibility of direct reduction of carbon-bearing pellets in vanadium-titanium-iron concentrate increases with the increase of reaction temperature. The higher the temperature, the higher the reduction rate of the pellet in the early stage of the reaction, the higher the final reduction degree reached and the shorter the time it takes to reach the final reduction degree. The reduction reaction time was controlled by a chemical reaction with an activation energy of 73.17 kJ / mol. Post-diffusion control, the activation energy of 152.02 kJ / mol. Reduction of post-reaction speed is less than the previous reaction rate.