Study on the Formation of Ti（C,N） in Low TiO₂ Content Blast Furnace Slag

During smelting of iron ore containing low TiO₂ content in blast furnace(BF),Ti(C,N) easily forms,which has a great influence on the performance of the slag and hot metal.Therefore,the study on its formation is of great significance for BF smelting.In this paper,the formation of Ti(C,N) in low TiO₂ content slag and its influencing factors are studied with the software FactSage,and the relationship between temperatures and[Ti] in hot metal is verified under laboratory conditions.The results show that in BF smelting of low TiO₂ content mineral,Ti(C,N) comes into being at 1 666 K,and reaches its maximum value at 1 783 K.The temperature,ratio of slag to hot metal,and TiO₂ content in the slag have greatest impact on the formation of Ti(C,N),while the content of Al₂O₃ and MgO,and dual basicity of slag contribute much less to its formation.The titanium content in hot metal is mainly affected by the temperature and Ti(C,N) reaction equilibrium,and has no obvious relationship with TiO₂ content in the slag.