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 H2 O percentage in the gas mixture could obviously decrease the reduction rate because the equilibrium partial pressure of H2 decreased with increasing content of H2 O in the gas mixture and then the driving force of reduction reaction was reduced.When the H2 content was high,the apparent reaction rate was so rapid when the average size of iron ore fines was less than 1mm that the reaction temperature can be as low as 750 ℃;when the average size of iron ore fines was more than 1mm,a high reaction temperature of 800 ℃ was required.In addition,it was also found that the content of H2 O should be less than 10%for efficient reduction. Reduction kinetics of fine iron ore powder in different gas mixtures were investigated in high-temperature fluidized bed at a scale of kilograms. Fluid 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. equations for calculating instantaneous and average oxidation rates were deduced. It was found that an increasing H2 O percentage in the gas mixture could soon decrease the reduction rate because the equilibrium partial pressure of H2 decreased with increasing content of H2 O in the gas mixture and then the driving force of reduction reaction was reduced .When the H2 content was high, the apparent reaction rate was so rapid when the average size of iron ore fines was less than 1mm that the reaction temperature can be as low as 750 ° C .; when the average size of iron ore fines was more than 1mm, a high reaction temperature of 800 ℃ was required. In addition, it was also found that the content of H2O should be less than 10% for efficient reduction.