摘要
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.
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 rain, 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.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第2期247-250,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(51074040)
关键词
直接还原
渣铁熔分
含碳球团
表观还原度
还原速率
direct reduction
melting and separation of slag and iron
ore-coal composite pellet
apparent reductivity
reduction rate
