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Influence of ladle slag additions on BOF process under production conditions
Royal Institute of Technology (KTH).
Royal Institute of Technology (KTH).
RISE, Swerea, Swerea MEFOS.
Royal Institute of Technology (KTH).
2012 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 39, no 5, 318-326 p.Article in journal (Refereed)
Abstract [en]

The influence of recycled ladle slag on the basic oxygen furnace (BOF) process under production conditions was investigated in plant trials. More specifically, 25 heats with ladle slag additions and 23 heats without ladle slag additions were studied. Both steel and slag samples were collected, from which the chemical compositions were determined. In addition, several process parameters were monitored. Overall, it was found that recirculation of ladle slag during normal production conditions works fine. On the positive side, it was seen that the steel quality concerning the phosphorus and sulphur contents of liquid steel has, in accordance with previous studies, not been affected by the ladle slag additions. Furthermore, no major differences in the slag composition occur when the recycling of ladle slag to BOF is performed. Finally, in comparison to previous studies, the increased tendency for slopping when adding ladle slag could be eliminated with a change in the lance schedule. However, on the negative side, it was seen that the addition of ladle slag leads to an increased blowing time due to lower iron ore additions. Moreover, the slag weight at tapping increased due to an increased weight of added slag formers. © 2012 Institute of Materials, Minerals and Mining.

Place, publisher, year, edition, pages
2012. Vol. 39, no 5, 318-326 p.
Keyword [en]
BOF, Ladle slag, Lime dissolution, Recycling, Slag formation, Steel composition
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12674DOI: 10.1179/1743281211Y.0000000073Scopus ID: 2-s2.0-84861967683OAI: oai:DiVA.org:ri-12674DiVA: diva2:972866
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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