Influence of atmosphere and basicity on softening and melting behaviors of the CaO-FeO-SiO2-Al2O3-MgO System

Shigeru Ueda; Takahiro Miki; Sun Joong Kim; Xu Gao; Hiroshi Nogami; Shin Ya Kitamura

doi:10.2355/ISIJINTERNATIONAL.ISIJINT-2019-136

Influence of atmosphere and basicity on softening and melting behaviors of the CaO-FeO-SiO₂-Al₂O₃-MgO System

Shigeru Ueda, Takahiro Miki, Sun Joong Kim, Xu Gao, Hiroshi Nogami, Shin Ya Kitamura

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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 1 723 or 1 773 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.

Original language	English
Pages (from-to)	1380-1388
Number of pages	9
Journal	Isij International
Volume	60
Issue number	7
DOIs	https://doi.org/10.2355/ISIJINTERNATIONAL.ISIJINT-2019-136
Publication status	Published - 2020

Keywords

Blast furnace
Coke bed
Gas permeability
Iron ore
Melting
Softening

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.2355/ISIJINTERNATIONAL.ISIJINT-2019-136

Cite this

@article{f0345a42842249c4ab4b37253065b72b,

title = "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-SiO2-Al2O3-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/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.",

keywords = "Blast furnace, Coke bed, Gas permeability, Iron ore, Melting, Softening",

author = "Shigeru Ueda and Takahiro Miki and Kim, {Sun Joong} and Xu Gao and Hiroshi Nogami and Kitamura, {Shin Ya}",

note = "Funding Information: This article is based on results obtained from “Development of technologies for environmentally harmonized steelmaking process, 'COURSE50'” project commissioned by the New Energy and Industrial Technology Development Organization (NEDO). Authors thank for the project, and also thank Mr. A. Ito, Ms. M. Hayasaka for their advice on experiments and analysis. Publisher Copyright: {\textcopyright} 2020 Iron and Steel Institute of Japan. All rights reserved.",

year = "2020",

doi = "10.2355/ISIJINTERNATIONAL.ISIJINT-2019-136",

language = "English",

volume = "60",

pages = "1380--1388",

journal = "Transactions of the Iron and Steel Institute of Japan",

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T1 - Influence of atmosphere and basicity on softening and melting behaviors of the CaO-FeO-SiO2-Al2O3-MgO System

AU - Ueda, Shigeru

AU - Miki, Takahiro

AU - Kim, Sun Joong

AU - Gao, Xu

AU - Nogami, Hiroshi

AU - Kitamura, Shin Ya

N1 - Funding Information: This article is based on results obtained from “Development of technologies for environmentally harmonized steelmaking process, 'COURSE50'” project commissioned by the New Energy and Industrial Technology Development Organization (NEDO). Authors thank for the project, and also thank Mr. A. Ito, Ms. M. Hayasaka for their advice on experiments and analysis. Publisher Copyright: © 2020 Iron and Steel Institute of Japan. All rights reserved.

PY - 2020

Y1 - 2020

N2 - 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 1 723 or 1 773 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.

AB - 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 1 723 or 1 773 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.

KW - Blast furnace

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KW - Iron ore

KW - Melting

KW - Softening

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