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以低品位块矿为原料,褐煤半焦为还原剂,进行直接还原研究.在温度为1100℃,还原时间为1.5h,还原剂配量为30%~40%,可获得金属化率为85%以上的直接还原铁.在煤基回转窑中,加入40%配比量的褐煤可获得与30%半焦加入量相同的金属化率.回转窑实验所得平均金属化率较低,仅为70.44%,这主要是由于窑温分布不均匀,高温区停留时间短,还原产品空冷等情况造成的.如若温度控制得当,还原时间充足,还原铁密闭降温,金属化率可达到80%以上.
Low-grade lump ore as raw material and lignite semi-coke as reductant were used to study the direct reduction.When the temperature was 1100 ℃, the reduction time was 1.5h and the dosage of reducing agent was 30% ~ 40%, the metallization rate was 85 % Of the direct reduction of iron in the coal-based rotary kiln, adding 40% of the proportion of lignite obtained with 30% of the amount of semi-coke addition of the same metallization rate of the rotary kiln average metallization rate was low, only 70.44%, mainly due to uneven temperature distribution in the kiln, short residence time in the high temperature zone, air cooling of the reduction product, etc. If the temperature is properly controlled and the reduction time is sufficient, the reduction temperature of the reduced iron can be reduced to 80%.