Abstract:In order to explore the feasibility of adding titanium concentrate to Angang Karala concentrate for pelletizing, the effects of bentonite ratio, titanium concentrate ratio and roasting temperature on the properties of titanium-bearing pellets were investigated. The results show that the qualified green pellets could be prepared with 5% to 25% titan magnetite and 1.3% to 1.5% bentonite in terms of mass fraction. The roasting temperature and the mass faction of titanomagnetite played an important role in the compressive strength of the finished ball. As the roasting temperature increased, the compressive strength first increased and then decreased, reaching the maximum value at about 1 200℃. From the perspective of mineralogical phase, the mechanism of relatively low roasting temperature of titanium-bearing pellets as well as the difference between their strength and that of ordinary ones was studied by means of polarization microscope, SEM, EDS and EPMA. It is found that titanium-bearing pellets have low roasting temperature due to the formation of ilmenite at 1 150℃, which could provide intensity in the pellets. Furthermore, the oxidative recrystallization at high temperature is poor. Compared with the ordinary pellets which have a large number of fine and uniform magnetite grains, the ilmenite in the titanium-bearing pellets is large, resulting in their weak oxidative recrystallization, and their strength is lower than that of the ordinary pellets.