Settlement Process of Iron in Titania Bearing Blast Furnace Slag

The viscosity of the vanadium titano-magnetite slag from Chengde iron & steel company is bigger than the common slag,the separation of the slag-iron is difficult,and the iron content of the slag is about 2%,which not only makes the usage of the slag is difficult,but also leads to the higher producing costs of pig.The formation reason of iron bearing titano-magnetite slag was analysed,the behavior of the Fe precipitation in the titania bearing slag was studied,and the influences of the different dwell time,temperature and the viscosity of the slag on the settlement process of iron in titaniferous slag of blast furnace were explored.The results show that the dwell time of slag have a complex impact on the iron in the slag.When the dwell time is 20~30 min,the settlement of iron is obvious,and with the time extending,the settlement of iron has little change,while its location is lower and the granularity is bigger,as the dwell time is 40~80 min.The temperature of the slag sample has a significant impact on the iron content of the slag.With increasing dwell temperature,the iron content of the slag significantly decreases.When the temperature is 1 500℃,the iron content decreases from 2%to 0.4%.In addition,the viscosity have the close relationship with the iron content of slag.Adding the calcium fluoride into the slag would reduce the viscosity of the slag and promote the settlement process of iron.It is proposed to add 1% calcium fluoride which generates better settlement effect.