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The Evolution of Structural Order as a Measure of Thermal History of Coke in the Blast Furnace
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
SMaRT Centre, School of Materials Science and Engineering, The University of New South Wales.
Swerea MEFOS AB.
SMaRT Centre, School of Materials Science and Engineering, The University of New South Wales.
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2014 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 45, no 2, p. 603-616Article in journal (Refereed) Published
Abstract [en]

Investigations were carried out on cokes heat treated in the laboratory and on cokes extracted from the experimental blast furnace (EBF) raceway and hearth. X-ray diffraction (XRD) measurements were performed to investigate changes in structural order (Lc), chemical transformations in coke ash along with comparative thermodynamic equilibrium studies and the influence of melt. Three data processing approaches were used to compute Lc values as a function of temperature and time and linear correlations were established between Lc and heat treatment temperatures during laboratory investigations. These were used to estimate temperatures experienced by coke in various regions of EBF and estimated raceway temperatures were seen to follow the profile of combustion peak. The MgAl2O4 spinel was observed in coke submerged in slag during laboratory studies and in cokes found further into the raceway. Coke in contact with hot metal showed XRD peaks corresponding to presence of Fe3Si. The intensity of SiO2 peak in coke ash was seen to decrease with increasing temperature and disappeared at around 1770 K (1500 °C) due to the formation of SiC. This study has shown that the evolution of structural order and chemical transformations in coke could be used to estimate its thermal history in blast furnaces.

Place, publisher, year, edition, pages
2014. Vol. 45, no 2, p. 603-616
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-4507DOI: 10.1007/s11663-013-9977-7ISI: 000336980600034Scopus ID: 2-s2.0-84899430650Local ID: 272fb233-5351-43bc-ab6b-794fef3fccdeOAI: oai:DiVA.org:ltu-4507DiVA, id: diva2:977381
Note
Validerad; 2014; 20131112 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Lundgren, MariaBjörkman, Bo

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Department of Civil, Environmental and Natural Resources EngineeringMinerals and Metallurgical Engineering
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Metallurgy and Metallic Materials

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