含碳球团的低温熔分

根据低nC/nO含碳球团直接还原-低温熔分工艺制备粒铁的技术思想,进行了低nC/nO含碳球团低温条件下的熔分实验研究.实验结果表明,1 300℃,nC/nO为0.8的含碳球团,还原熔分时间为55 min时,得到的铁粒中存有少量熔渣2FeO.SiO2;60 min时渣铁则完全分离,铁粒中几乎没有熔渣存在.nC/nO为0.8和0.85的含碳球团还原后渣相FeO质量分数较高,熔点较低,易于渣铁熔化分离.nC/nO为0.9的含碳球团渣相FeO的质量分数较低,熔点较高,需要较长时间或在较高温度下才能进行渣铁分离.在1 320℃,nC/nO为0.8,还原熔分时间为60 min时,铁的收得率可达86.1%以...

Melting Separation of Ore-Coal Composite Pellet at Low Temperature

The melting separation of metal and slag was investigated by direct reduction of ore-coal composite pellet at low nC/nO followed by melting separation at low temperature.The results showed that a small quantity of slag(2FeO·SiO2) exists in iron nugget at 1 300 ℃,nC/nO=0.8 and 55 min of reduction-melting time.When the reduction-melting time is 60 min,the metal and slag are completely separated,and almost no slag exists in iron nugget. For the ore-coal composite pellet of nC/nO=0.8 or 0.85,the mass fraction of FeO in slag is relatively higher,the melting point is lower and the slag is easy to be separated from metal after reduction.For the ore-coal composite pellet of nC/nO=0.9,the mass fraction of FeO in slag is lower and the melting point is higher,and the slag is not easy to be separated unless heating at higher temperature or for longer melting time.When nC/nO=0.8,and reduction-melting time is 60 min at 1 320 ℃,the recovery rate of iron is greater than 86.1%,and the mass fraction of iron in iron nugget is about 94.8%.