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摘要
Reduction kinetics of fine iron ore powder in different gas mixtures were investigated in high-temperature fluidized bed at a scale of kilograms. Influence of processing parameters, such as particle size, gas flow velocity, height of charge, temperature, compositions of gas mixture, and percentage of inert components, on reduction kinetics was experimentally determined under the condition of fluidization. The equations for calculating instantaneous and average oxidation rates were deduced. It was found that an increasing H2O percentage in the gas mixture could obviously decrease the reduction rate because the equilibrium partial pressure of H-2 decreased with increasing content of H2O in the gas mixture and then the driving force of reduction reaction was reduced. When hen the H-2 content was high, the apparent,reaction rate was so rapid when the average size of iron ore fines was less than 1 mm that the reaction temperature can be as low as 750 degrees C; when the average size of iron ore fines was more than 1 mm, a high reaction temperature of 800 degrees C was required. In addition, it was also found that the content of H2O should be less than 10% for efficient reduction.
- 出版日期2015-5
- 单位钢铁研究总院
