通过可视流化床研究不同温度和氢气流速下对还原白云鄂博铁精矿的影响.试验表明,同一温度下,氢气流速的增加有利于提高流化还原反应的还原效率,但这种作用在低温下更为明显.随温度的升高,流化还原效率提高,但高温下流化效率增长幅度小于低温.应用热重分析研究了不同温度下氢气还原白云鄂博铁精矿的还原动力学,结果表明:其反应的限制性环节为内扩散,活化能随还原时间呈现先下降后上升的现象,而表观活化能的降低更有利于反应的加速进行.在试验条件下,5 ～ 10 min时的还原反应速度较快.
The influence of different temperature and hydrogen flow rate on reduction of Bayan Ebo iron concentrate powder was studied by a visible fluid bed.The results show that increasing hydrogen flow rate helps to improve the reduction efficiency at the same temperature.However,this effect becomes apparent at low temperatures.The influence of temperature has the same tendency as hydrogen flow rate.The kinetics of hydrogen reduction of Bayan Ebo iron concentrate powder was studied by thermo-gravimetric analysis under different temperatures.It indicates that the restrictive factor to is gas phase diffusion.The activation energy first decreases and then increases with the reduction time,and decreasing of the apparent activation energy is more favorable to the acceleration of the reaction.Under the experiment conditions 5 ～ 10 mins reaction time can achieve the bigger reduction reaction rate.
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