Influencing factors of the reduction of vanadium titano-magnetite carbon composite pellets

The influences of reduction temperature,reduction time and the C/O molar ratio on the reduction of vanadium titano-magnetite carbon composite pellets were investigated by single factor experiments.The mechanism of reduction was explained in combination with scanning electron microscopy(SEM).Raising the reduction temperature,prolonging the reduction time and increasing the C/O molar ratio properly can promote the reduction of vanadium titano-magnetite.With the rise of reduction temperature,the metallization rate ascends quickly before 1 350℃ and gently then.With the increase of reduction time and C/O molar ratio,the metallization rate moves up firstly and then down,but the carbon residue content decreases with the reduction proceeding.When the reduction temperature is 1 350℃,the reduction time is 30 min and the C/O molar ratio is 1.2,the metallization rate of the pellets reaches the maximum.SEM observation shows that iron coupling crystals form in the reduction process,and their size and shape vary from each other under different reducing conditions.