Research on the interaction of burden gangue phases based on thermodynamic calculation

Abstract

The melting drip test and single-particle test show that there is an interaction between the gangue phases of different property burdens. Finally, the primary slag forms with uniform ingredients. This article analyses the melting and interaction mechanism of gangue phases in different properties of burdens by using FactSage thermodynamic calculation software and expounds on the impact of interaction on smelting under different process conditions. The results show that due to the different phase compositions, the liquid phase ratio of the gangue phase in pellet ore is higher than that in sinter ore. The mixed primary slag composed of pellets and sintered gangue phases has a higher liquid phase ratio than that of a single sintered gangue phase, which is also higher than the weighted average of the liquid phase ratios of pellets and sintered gangue phases, indicating that interaction can promote the melting of refractory sintered gangue phases. The liquid phase ratio of the gangue phase increases with the increase of FeO content. Under current process conditions, using a high basicity sinter with an acidic burden is more reasonable than using a flux burden. In the future, high reduction potential blast furnaces such as oxygen blast furnaces and hydrogen-rich blast furnaces can use acidic and flux burden.