低配碳比含碳球团直接还原的实验研究

根据低配碳比含碳球团还原熔分工艺制备粒铁的技术思想,对低配碳比含碳球团的直接还原进行实验研究.结果表明,这种低配碳比的含碳球团还原速度较快,还原反应进行了10 min时表观还原度为84%,20min时表观还原度可达88%;继续延长反应时间,球团表层还原得到的少量金属铁会再次被氧化成FeO.还原反应结束后,球团内仍存在少量尚未还原的FeO,它们与脉石中的SiO2形成低熔点的铁橄榄石,有利于工艺后期渣铁的熔化及分离.

Direct Reduction of Ore-Coal Composite Pellets Bearing Low Carbon Content

Using the direct reduction technology and the principle of melting and separation of slag and iron,the reduction of ore-coal composite pellets bearing low carbon content at a low temperature was investigated experimentally.The results showed that the reduction rate of these pellets was very fast.When the reduction reaction lasted for 10 min and for 20 min,the apparent reductivity reached about 84% and 88%(the maximum value),respectively.When the reaction time was prolonged further,a small quantity of direct reduced iron(DRI)on the surface of the pellets was re-oxidized.The FeO remained in the pellets after the reduction reaction reacted with SiO2,forming 2FeO·SiO2 with the low melting-point,which is beneficial to melting and separation of slag and iron.