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Influence of ladle slag additions on BOF process under production conditions
LKAB, Malmberget, Sweden.
Swerea MEFOS AB, Process Metallurgy Department, Luleå, Sweden.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.ORCID iD: 0000-0003-1919-9964
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2012 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 39, no 5, 318-326 p.Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2012. Vol. 39, no 5, 318-326 p.
Keyword [en]
BOF, ladle slag, recycling, steel, composition.
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-33299DOI: 10.1179/1743281211Y.0000000073ISI: 000304538100002Scopus ID: 2-s2.0-84861967683OAI: oai:DiVA.org:kth-33299DiVA: diva2:414315
Note
QC 20120625. Updated from manuscript to article in journal.Available from: 2011-05-03 Created: 2011-05-03 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Influence of Ladle-slag Additions on BOF-Process Parameters
Open this publication in new window or tab >>Influence of Ladle-slag Additions on BOF-Process Parameters
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The influence of ladle-slag additions on the BOF-process performance were investigated in plant trials. The aim of the study was to recycle ladle slag from secondary steelmaking to the LD-converter to save lime and improve the slag formation. More specifically, two plant trial campaigns covering in total 83 heats, whereof 47 with ladle-slag additions and 36 without ladle-slag additions, were performed.

 Slag and steel sampling of the process were performed at tapping as well as during blowing at 15, 35, and 65% of the total blowing time. During the first campaign, ladle slag was added through the chute and lime reductions were made manually to correct for the ladle-slag addition.

 In the second campaign, a development of the approach was made to suite a normal production practice. More specifically, the ladle slag was added through the weight-hopper system and implemented in the process-control system. In this way, the lime additions were reduced automatically by approximately 260 kg per heat. Moreover, the heat balance was compensated with a reduction in the iron-ore consumption. Additionally, the lance program was modified and the lance was lowered in the initial stages of the blow.

 On the positive side, it was found that no demerits in the metallurgical performance of the process occur when ladle slag is recycled to the BOF-process. Furthermore, only slight affections on the slag composition were found, mainly with respect to the Al2O3 and FeO-content. In addition, the ladle slag was shown to melt during the initial stages of the blow. This contributed to an increased slag weight both during the blow and at tapping. However, a negative effect on the blowing time was experienced during the trials. Although, this effect was more pronounced during the first campaign and could be reduced with a controlled heat balance during the second campaign.

 

 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xii, 28 p.
Keyword
BOF, slag formation, ladle slag, recycling, steel, composition, energy
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-33270 (URN)978-91-7415-961-5 (ISBN)
Presentation
2011-05-04, Sal B1, KTH, Brinellvägen 23, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20110503Available from: 2011-05-03 Created: 2011-05-02 Last updated: 2011-05-03Bibliographically approved

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