Influence of Atmosphere and Basicity on Softening and Melting Behaviors of the CaO–FeO–SiO₂–Al₂O₃–MgO System

Abstract

In this study, we analyze the softening and melting behaviors of the CaO-FeO-SiO 2 -Al 2 O 3 -MgO system for improving gas permeability in a blast furnace. The temperature of the oxide is increased to 1 723 or 1 773 K in a CO/CO 2 mixture; the softening and melting temperatures and the temperature of penetration into the coke bed are measured. Because the CO/CO 2 ratio in the atmosphere influences the stable state of iron or iron oxide, the softening and melting behaviors are investigated for numerous CO/CO 2 ratios. We observe that the reduction of the sample progresses in an atmosphere with a high CO/CO 2 ratio, and thus, the softening temperature increases. Because the composition of the oxidation phase influences the solidus and liquidus temperatures, the influence of basicity on the phenomena is also investigated, and a method of reducing the difference between the softening and dripping temperatures is discussed.

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

“…[21][22][23] These are mainly being studied using laboratory experiments 22) or DEM-CFD (Discrete Element Method and Computational Fluid Dynamics) models. 21,23) Ueda et al 24) studied the softening and melting behaviors of the CaO-FeO-SiO 2 -Al 2 O 3 -MgO system for improving gas permeability in a blast furnace. The temperature of the oxide is increased to 1 450°C or 1 500°C in a CO/CO 2 mixture.…”

Comprehensive Research about Critical Interaction Region Named Cohesive Zone in Series of Dissected Blast Furnaces

“…63) Experimental condition can be controlled to simulate the performance of cohesive zone under different smelting, which can provide sufficient research space of researchers from all over the world. Hence a series of studies about the behavior of burden in cohesive zone have been reporting in the past two years, such as the comparison between sinter, olivine pellet and acid pellet, [64][65][66] the high temperature interaction between different charge, 67,68) the effect of certain content (C 2 S 69) ) or certain condition (pre-reduction degree, 70) atmosphere and basicity 71) ) on the phase formation, the properties of some special feed materials like high Al 2 O 3 content feed charge, 72) high titanium sinter, 46) and titanomagnetite ironsand coal composite hot briquette. 73) The cognition process of cohesive zone is a process of mutual support and cooperation of various methods.…”