Composition-dependent reactive wetting of molten slag on coke substrates

Joon Seok Oh, Joonho Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The reactive wetting behavior of molten CaO–SiO2–Al2O3–MgO slag drops on a coke substrate was investigated using the sessile drop method at 1500 °C in flowing Ar. The wetting behavior of slags in blast furnaces is known to affect the energy efficiency of ironmaking, but has not yet been sufficiently characterized. In this study, the ratio of MgO to CaO was varied from 0.01 to 0.56, while the concentrations of SiO2 and Al2O3 were fixed at 34 and 17 wt%, respectively. The contact angle between slag and coke remained constant for a certain period of time, and then suddenly decreased remarkably. The time until this dramatic contact angle change increased with increasing the ratio of MgO to CaO. Chemical analysis revealed that the reduction of SiO2 in the slag improved the wettability by forming SiC on the coke substrate, while MgO in the slag was preferentially reduced and prevented the reduction of SiO2. Consequently, with increasing MgO content, the wettability of the molten slag on the coke substrate decreased.

Original languageEnglish
Pages (from-to)1813-1819
Number of pages7
JournalJournal of Materials Science
Volume51
Issue number4
DOIs
Publication statusPublished - 2016 Feb 1

Fingerprint

Coke
Slags
Wetting
Molten materials
Substrates
Chemical analysis
Contact angle
Blast furnaces
Energy efficiency

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Composition-dependent reactive wetting of molten slag on coke substrates. / Oh, Joon Seok; Lee, Joonho.

In: Journal of Materials Science, Vol. 51, No. 4, 01.02.2016, p. 1813-1819.

Research output: Contribution to journalArticle

@article{70cba940400c4664b8c0cb1701c48f86,
title = "Composition-dependent reactive wetting of molten slag on coke substrates",
abstract = "The reactive wetting behavior of molten CaO–SiO2–Al2O3–MgO slag drops on a coke substrate was investigated using the sessile drop method at 1500 °C in flowing Ar. The wetting behavior of slags in blast furnaces is known to affect the energy efficiency of ironmaking, but has not yet been sufficiently characterized. In this study, the ratio of MgO to CaO was varied from 0.01 to 0.56, while the concentrations of SiO2 and Al2O3 were fixed at 34 and 17 wt{\%}, respectively. The contact angle between slag and coke remained constant for a certain period of time, and then suddenly decreased remarkably. The time until this dramatic contact angle change increased with increasing the ratio of MgO to CaO. Chemical analysis revealed that the reduction of SiO2 in the slag improved the wettability by forming SiC on the coke substrate, while MgO in the slag was preferentially reduced and prevented the reduction of SiO2. Consequently, with increasing MgO content, the wettability of the molten slag on the coke substrate decreased.",
author = "Oh, {Joon Seok} and Joonho Lee",
year = "2016",
month = "2",
day = "1",
doi = "10.1007/s10853-015-9588-6",
language = "English",
volume = "51",
pages = "1813--1819",
journal = "Journal of Materials Science",
issn = "0022-2461",
publisher = "Springer Netherlands",
number = "4",

}

TY - JOUR

T1 - Composition-dependent reactive wetting of molten slag on coke substrates

AU - Oh, Joon Seok

AU - Lee, Joonho

PY - 2016/2/1

Y1 - 2016/2/1

N2 - The reactive wetting behavior of molten CaO–SiO2–Al2O3–MgO slag drops on a coke substrate was investigated using the sessile drop method at 1500 °C in flowing Ar. The wetting behavior of slags in blast furnaces is known to affect the energy efficiency of ironmaking, but has not yet been sufficiently characterized. In this study, the ratio of MgO to CaO was varied from 0.01 to 0.56, while the concentrations of SiO2 and Al2O3 were fixed at 34 and 17 wt%, respectively. The contact angle between slag and coke remained constant for a certain period of time, and then suddenly decreased remarkably. The time until this dramatic contact angle change increased with increasing the ratio of MgO to CaO. Chemical analysis revealed that the reduction of SiO2 in the slag improved the wettability by forming SiC on the coke substrate, while MgO in the slag was preferentially reduced and prevented the reduction of SiO2. Consequently, with increasing MgO content, the wettability of the molten slag on the coke substrate decreased.

AB - The reactive wetting behavior of molten CaO–SiO2–Al2O3–MgO slag drops on a coke substrate was investigated using the sessile drop method at 1500 °C in flowing Ar. The wetting behavior of slags in blast furnaces is known to affect the energy efficiency of ironmaking, but has not yet been sufficiently characterized. In this study, the ratio of MgO to CaO was varied from 0.01 to 0.56, while the concentrations of SiO2 and Al2O3 were fixed at 34 and 17 wt%, respectively. The contact angle between slag and coke remained constant for a certain period of time, and then suddenly decreased remarkably. The time until this dramatic contact angle change increased with increasing the ratio of MgO to CaO. Chemical analysis revealed that the reduction of SiO2 in the slag improved the wettability by forming SiC on the coke substrate, while MgO in the slag was preferentially reduced and prevented the reduction of SiO2. Consequently, with increasing MgO content, the wettability of the molten slag on the coke substrate decreased.

UR - http://www.scopus.com/inward/record.url?scp=84953359331&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84953359331&partnerID=8YFLogxK

U2 - 10.1007/s10853-015-9588-6

DO - 10.1007/s10853-015-9588-6

M3 - Article

AN - SCOPUS:84953359331

VL - 51

SP - 1813

EP - 1819

JO - Journal of Materials Science

JF - Journal of Materials Science

SN - 0022-2461

IS - 4

ER -