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Title: Interaction of Pure Alumina Refractory with FeO–SiO 2 and FeO–SiO 2 –CaO Slags Relevant to the Novel Flash Ironmaking Technology

Abstract

Interaction of alumina (Al 2 O 3 ) refractory with FeO–SiO 2 and FeO–SiO 2 –CaO slags relevant to the flash ironmaking technology (FIT) is investigated in this work. It is shown that for slags relevant to FIT, the interaction process can be described by a kinetic model based on counter diffusion of only Fe 2+ and Al 3+ cations through hercynite (FeAl 2 O 4 ) formed as a result of the interaction. The diffusion of Si 4+ and Ca 2+ ions through FeAl 2 O 4 can be neglected, and the only effect these cations have is that they affect the activity of iron oxide (FeO) at the slag–FeAl 2 O 4 boundary. Analyses of reacted samples using X‐ray diffraction (XRD), scanning electron microscopy–energy dispersive X‐ray spectroscopy (SEM–EDX), and electron probe microanalyzer (EPMA) show that the proposed model appropriately describes the growth of FeAl 2 O 4 with the parabolic rate law being obeyed for both FeO–SiO 2 and FeO–SiO 2 –CaO slags in the temperature range of 1200–1400 °C. The values of effective diffusivity () are calculated independently from experiments with FeO–SiO 2 and FeO–SiO 2 –CaO slags agreed with each other, with the activation energy values inmore » the two cases being 246 and 253 kJ mol −1 , respectively. These values of and activation energy are in good agreement with the corresponding values obtained previously from Fe–Al 2 O 3 and FeO–Al 2 O 3 systems.« less

Authors:
ORCiD logo [1];  [1]
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  1. Department of Metallurgical Engineering University of Utah Salt Lake City UT 84102 USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1559359
Grant/Contract Number:  
EE0005751
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Steel Research International
Additional Journal Information:
Journal Name: Steel Research International Journal Volume: 90 Journal Issue: 9; Journal ID: ISSN 1611-3683
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Sarkar, Rahul, and Sohn, Hong Yong. Interaction of Pure Alumina Refractory with FeO–SiO 2 and FeO–SiO 2 –CaO Slags Relevant to the Novel Flash Ironmaking Technology. Germany: N. p., 2019. Web. doi:10.1002/srin.201900104.
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Sarkar, Rahul, & Sohn, Hong Yong. Interaction of Pure Alumina Refractory with FeO–SiO 2 and FeO–SiO 2 –CaO Slags Relevant to the Novel Flash Ironmaking Technology. Germany. https://doi.org/10.1002/srin.201900104
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Sarkar, Rahul, and Sohn, Hong Yong. Fri . "Interaction of Pure Alumina Refractory with FeO–SiO 2 and FeO–SiO 2 –CaO Slags Relevant to the Novel Flash Ironmaking Technology". Germany. https://doi.org/10.1002/srin.201900104.
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@article{osti_1559359,
title = {Interaction of Pure Alumina Refractory with FeO–SiO 2 and FeO–SiO 2 –CaO Slags Relevant to the Novel Flash Ironmaking Technology},
author = {Sarkar, Rahul and Sohn, Hong Yong},
abstractNote = {Interaction of alumina (Al 2 O 3 ) refractory with FeO–SiO 2 and FeO–SiO 2 –CaO slags relevant to the flash ironmaking technology (FIT) is investigated in this work. It is shown that for slags relevant to FIT, the interaction process can be described by a kinetic model based on counter diffusion of only Fe 2+ and Al 3+ cations through hercynite (FeAl 2 O 4 ) formed as a result of the interaction. The diffusion of Si 4+ and Ca 2+ ions through FeAl 2 O 4 can be neglected, and the only effect these cations have is that they affect the activity of iron oxide (FeO) at the slag–FeAl 2 O 4 boundary. Analyses of reacted samples using X‐ray diffraction (XRD), scanning electron microscopy–energy dispersive X‐ray spectroscopy (SEM–EDX), and electron probe microanalyzer (EPMA) show that the proposed model appropriately describes the growth of FeAl 2 O 4 with the parabolic rate law being obeyed for both FeO–SiO 2 and FeO–SiO 2 –CaO slags in the temperature range of 1200–1400 °C. The values of effective diffusivity () are calculated independently from experiments with FeO–SiO 2 and FeO–SiO 2 –CaO slags agreed with each other, with the activation energy values in the two cases being 246 and 253 kJ mol −1 , respectively. These values of and activation energy are in good agreement with the corresponding values obtained previously from Fe–Al 2 O 3 and FeO–Al 2 O 3 systems.},
doi = {10.1002/srin.201900104},
journal = {Steel Research International},
number = 9,
volume = 90,
place = {Germany},
year = {Fri Jun 28 00:00:00 EDT 2019},
month = {Fri Jun 28 00:00:00 EDT 2019}
}
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Journal Article:
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Accepted Manuscript (Publisher)
Publisher's Version of Record
https://doi.org/10.1002/srin.201900104
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Works referenced in this record:

Hydrogen Reduction Kinetics of Magnetite Concentrate Particles Relevant to a Novel Flash Ironmaking Process
journal, October 2012

Interaction of ferrous oxide with alumina refractory under flash ironmaking conditions
journal, August 2019

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