鄂西某鲕状赤铁矿石深度还原-弱磁选试验

分别以取自吉林松原的烟煤和取自鞍钢的焦炭作为还原剂，对鄂西某鲕状赤铁矿石进行了深度还原-弱磁选试验研究。采用焦炭作还原剂时，在碳氧摩尔比为3.5、还原温度为1 250 ℃、还原时间为160 min、还原产物磨矿细度为-200目占88.92%的条件下，还原产物的金属化率为90.50%，弱磁选精矿的铁品位和铁回收率分别为96.47%和87.62%。采用煤作还原剂时，在碳氧摩尔比和还原温度不变、还原时间为50 min、还原产物磨矿细度为-200目占84.45%的条件下，还原产物的金属化率为91.63%，弱磁选精矿的铁品位和铁回收率分别为96.07%和88.54%。综合考虑工艺指标、能耗和还原剂成本，煤更适合作为深度还原时的还原剂。

Experiments on Deep Reduction and Magnetic Separation of an Oolitic Hematite from Western Hubei

Deep reduction and magnetic separation experiments on oolitic hematite for western Hubei province were investigated using coal from Songyuan of Jilin and coke from Ansteel as reductants respectively. Using coke as reductant，the performance indexes of the product，under the optimal process conditions of the reduction temperature for 1 250 ℃，the mole ratio of n(C)/n(O) for 3.5 and reduction time for 160 min and the grinding fineness of -200 mesh 88.92%，were described as follows: metallization rate being 90.50%，iron grade of concentrate reaching up to 96.47% and iron recovery reaching to 87.62%. Using coal as reductant，in the optimal conditions that the reduction temperature and the mole ratio of n(C)/n(O) were not changed and reduction time was 50 min with the grinding fineness of -200 mesh 84.45%，the metallization rate，iron grade of concentrate and iron recovery reached to 91.63%，96.07% and 88.54% respectively. The coal was more suitable to be used as the reductant of carbon-based reduction and magnetic separation process of an oolitic hematite from western Hubei province considering the process indexes，energy consumption and the cost of reductants.