Slag-Metal Separation Behaviors of Vanadium Titanomagnetite Metallized Pellets

摘要

The effects of smelting temperature, slag basicity and smelting time on the slag-metal separation and slag phase after smelting-separation for vanadium titanomagnetite metallized pellets were investigated in the present work. The results show that the increase of smelting temperature could decrease the viscosity of molten slag and promote slag-metal separation. Meanwhile, the diffraction peaks intensity of magnesia-alumina spinel in slag obviously increases. Within proper basicity range, increasing slag basicity is conductive to decreasing the liquidus temperature and viscosity of molten slag, and accelerating the settling velocities of iron drops. However, further increasing slag basicity to 1.0 would cause abundant generation of perovskite with high melting point in slag. Appropriate extension of smelting time contributes to the coalescence and settlement of iron droplets, but excessive smelting time may lead to the formation of TiC in slag, which is bad for the slag-metal separation.