ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Special Issue on "Recent Approaches to Control of Cohesive Zone Phenomena and Improvement of Permeability in Blast Furnace"
Influence of Atmosphere and Basicity on Softening and Melting Behaviors of the CaO–FeO–SiO2–Al2O3–MgO System
Shigeru UedaTakahiro MikiSun-Joong KimXu GaoHiroshi NogamiShin-ya Kitamura
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2020 Volume 60 Issue 7 Pages 1380-1388

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Abstract

In this study, we analyze the softening and melting behaviors of the CaO–FeO–SiO2–Al2O3–MgO system for improving gas permeability in a blast furnace. The temperature of the oxide is increased to 1723 or 1773 K in a CO/CO2 mixture; the softening and melting temperatures and the temperature of penetration into the coke bed are measured. Because the CO/CO2 ratio in the atmosphere influences the stable state of iron or iron oxide, the softening and melting behaviors are investigated for numerous CO/CO2 ratios. We observe that the reduction of the sample progresses in an atmosphere with a high CO/CO2 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.

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© 2020 by The Iron and Steel Institute of Japan
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