在自制的公斤级高温流化床中研究了CO还原1～3 mm矿粉的还原行为.随着时间的增加,样品的还原率增加,气体利用率却在下降,说明还原前期反应速度快,后期反应慢;温度越高,样品的还原率越大,气体的利用率越高,但随着还原时间的增加,差距在逐步缩小.当还原温度为850 ℃时,前20 min的还原率为80%,气体利用率为8%左右,这说明高温下,CO还原1～3 mm铁矿粉的反应速度是很快的.温度越高,表观反应速率常数越大,而且增加的幅度也越来越大;随着气速的增加,铁矿粉的还原率增加,并且几乎成线性关系,表明高温下,使用CO气体作为还原剂时,可以允许更高的气速,从而可以提高设备的生产效率.随着料层高度的增加,金属化率与还原率不断下降,然而气体利用率却在不断升高.试验中CO还原1～3 mm铁矿粉时的表观活化能为59.11 kJ/mol.
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