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ALKALI IN THE BLAST FURNACE – INFLUENCE OF MODIFIED ASH COMPOSITION IN COKE AND CHARGING PRACTICE
Swerim AB.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
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2018 (English)Conference paper, Published paper (Other academic)
Abstract [en]

The presence of alkalis (Na, K) in the blast furnace process (BF) is known to have negative influences on the process due to the catalytic effect on coke gasification, destruction of carbon structure by intercalation of alkali, scaffold formation and refractory attack. The nature of alkali compounds combined with the character of the process causes alkalis to recirculate and accumulate in the BF. Within this study, the distribution of alkali at different depths in the shaft for different charging practices has been studied by examination of excavated coke samples from LKAB’s Experimental Blast Furnace. A possible way of controlling the alkali load in blast furnace has been investigated by studying coke with modified ash composition for binding alkali in stable phases that can be drained out from BF with the slag.

Place, publisher, year, edition, pages
2018.
Keywords [en]
Blast furnace, Alkali recirculation, Coke, Alkali load
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-71132OAI: oai:DiVA.org:ltu-71132DiVA, id: diva2:1253932
Conference
International Congress on Science and Technology of Ironmaking
Available from: 2018-10-08 Created: 2018-10-08 Last updated: 2018-10-08

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
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  • vancouver
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  • nn-NO
  • nn-NB
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  • Other locale
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  • asciidoc
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