Effect of Sinter Reducibility on Softening-Melting-Dripping Behaviors of Burden: Sinter and Coke Layered Charging

抄録

Since the 20th century, the pressure on carbon emission reduction has increased gradually in blast furnace iron-making. Using the high reducibility sinter is considered as the way to further reduce carbon emissions. In this study, the effect of sinter reducibility on the softening-melting-dripping behavior is investigated based on sinter-coke-sinter-coke-sinter layered charging. It provides theoretical guidance for optimizing the burden structure. The results show that the softening-melting behavior is determined by the upper layer sinter under experimental conditions. With increasing sinter reducibility, softening start temperature drops from 1150°C to 1046°C, softening end temperature drops from 1270°C to 1185°C, melting start temperature decreases from 1270°C to 1197°C, dripping temperature increases from 1477°C to 1516°C. The cohesive zone of high reducibility sinter widens. Gas permeability index increases from 1042.20 Kpa·°C to 1199.56 Kpa·°C. Under 1150°C, gas utilization ratio increases with increasing sinter reducibility, and then the gas utilization ratio decreases as the melting begins. Therefore, the packing structure has a significant impact on the use of high reducibility sinter. High reducibility sinter can only be used to reduce emissions under a reasonable burden structure.