【作者】 张大江； 陈登福； 徐楚韶； 张竹明； 罗明发； 叶亚雄； 郑福生； 张洪彪；

【Author】 ZHANG Da-jiang~1,CHEN Deng-fu~1,XU Chu-shao~1,ZHANG Zhu-ming~2,LUO Ming-fa~2, YE Ya-xiong~2,ZHENG Fu-sheng~1,ZHANG Hong-biao~1 (1.College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China; 2.Kunming Iron and Steel Groups,Kunming,Yunnan 650302,China)

【机构】 重庆大学材料科学与工程学院； 昆明钢铁股份有限公司；

【摘要】 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.更多还原

【Abstract】 Direct reduction of iron in low-grade iron ore with addition of wood coal as reducing agent was studied.Based on the experimental results in laboratory,it was available for more than 85%DRI when the temperature was at 1100℃,reduction time 1.5 h and amount of reducing agent from 30%to 40%.Using added block ore and 40%ratio of brown coal,the same metallization rate could be obtained as that with 30%ratio of semi-coke in the rotary kiln.The average metallization rate,which was only 70.44%in the experiment of rotary kiln,was low due to the uneven distribution of temperature,short residence time in high temperature zone and air-cooling reduced products.Given the properly controlled temperature,adequate reduction time and sealed reduction condition,the metallization rate could reach 80%.更多还原