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Effect of different PCI practice on the texture obtained during reduction of iron oxide pellets
Luleå University of Technology.
MEFOS − Metallurgical Research Institute AB.
Luleå University of Technology.
2008 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 48, no 12, 1686-1695 p.Article in journal (Refereed)
Abstract [en]

In modern blast furnace ironmaking, producers continuously strive to reduce coke consumption by replacing coke with e.g., an increased amount of injected pulverized coal. A change in pulverized coal injection rate (PCR) and injection coal type will influence the in-furnace conditions and thus the reduction of iron oxides. In the present study, the reduction behaviour of olivine pellets and textures formed were investigated in the LKAB Experimental Blast Furnace (EBF) and in laboratory scale. In the EBF, effects of injection of an low-volatile (LV) and an high-volatile (HV) coal type at different PCR while two types of oxygen supply methods were employed were investigated. The choice of injection coal type was conclusive for the Femet texture formed during reduction, extent of Femet carburization and K distribution in the pellets. The amount of volatile matters in the coal type had a greater effect on the reduction properties than the PCR and oxygen supply method. Laboratory experiments simulating PCR, based on measurements in the EBF, showed that the initial reduction conditions, in terms of temperature level and reduction gas composition, determined the pellet texture up to a reduction degree of at least 60%. The tests carried out in the EBF showed that the pellets were well suited for blast furnace reduction under all the investigated process conditions. The laboratory tests supported this conclusion. © 2008 ISIJ.

Place, publisher, year, edition, pages
2008. Vol. 48, no 12, 1686-1695 p.
Keyword [en]
Blast furnace, Injection coal, Laboratory reduction, Oxygen supply, PCR, Pellet reduction, Pellet texture
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12692DOI: 10.2355/isijinternational.48.1686Scopus ID: 2-s2.0-60649091287OAI: oai:DiVA.org:ri-12692DiVA: diva2:972884
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
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  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
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  • Other locale
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