Journals →  Chernye Metally →  2014 →  #5 →  Back

Iron and Steel Making
ArticleName Basic oxygen furnace benchmarking. Maintenance and process considerations
ArticleAuthor Th. Kollmann, Ch. Jandl
ArticleAuthorData

BOF Product Management, RHI AG (Vienna, Austria):

Kollmann Th., e-mail: thomas.kollmann@rhi-ag.com
Jandl Ch.

Abstract

A higher level of product sophistication and unstable charging material quality require an economically optimized basic oxygen furnace (BOF) process operation. Technological benchmarking to assess different operating philosophies (e. g. with bottom gas purging versus without bottom purging) as well as various maintenance approaches (e. g. slag maintenance and maintenance using unshaped refractory products) and their infl uences on process stability and achievable metallurgical results are discussed. BOF maintenance matrix including the investment cost, operator stress, and metallurgical influence is presented and analyzed. It is shown that technical maintenance of converters end expectations of metallurgical results of oxygen purging process can’t be considered separately, because no one of the current repair methods can provide the lowest level of consumption and the best metallurgical results. Today practice of usage of saturated MgO slags as a cheap refractory material holds expenses for lining repair at a low level with simultaneous origination of essential deficiencies in purging process and in ladle treatment. This problem can be solved using reasonable compromise adapting to the concrete requirements.

keywords Basic oxygen practice, charging materials, bottom gas purging, slag maintenance, lining, unshaped refractory products
References

1. Plantfacts, Stahlinstitut VDEh, Düsseldorf, http://www.stahl-online.de/Deutsch/Stahlinstitut_VDEh/Technische_Fachinformation/Anlagendatenbank.php?Z_highmain=2&Z_highsub=9&Z_highsubsub=3
2. Kollmann, T.: Influence of bottom purging on the metallurgical results, Universität Leoben, Leoben, Österreich, 2010 (Master-Arbeit).
3. Fruehan, R. [ed.]: The Making, Shaping and Treating of Steel: Vol. 1 — Steelmaking and Refi ning, 11. Aufl ., AIST Publ., Warrendale, USA, 1998.
4. Reisinger, P.; Preßlinger, H.; Hiebler, H.; Zednicek, W.: BHM 144 (1999) Nr. 5, S. 196/203.
5. Obst, K.-H.; Schürmann, E.; Mahn, G.; Münchberg, W.; Nolle, D.: stahl u. eisen 100 (1980) Nr. 12, S. 1194/200.
6. Schürmann, E.; Kolm, I.: steel research 57 (1986), S. 7/12.
7. Mills, K. C.; Su, Y.; Fox, A. B.: ISIJ Intern. 45 (2005) Nr. 5, S. 619/33.
8. Messina, C.: Iron Steel Eng. 73 (1996) Nr. 6, S. 17/19.
9. Mörtl, G.; Kraft, W.; Barthel, H.: BHM 137 (1992) Nr. 5, S. 196/203.
10. Lammer, G.; Jandl, C.; Zettl, K.: Maintenance matri ces — overview of common refractory maintenance methods for BOFs and EAFs, RHI Bulletin (2011) Nr. 1, S. 12/17.
11. Bruckhaus, R.; Lachmund, H.: Stirring strategies to meet the highest metallurgical requirements in the BOF process, Proc. Iron and Steel Technology Conf. (AISTech 2007), Indianapolis, USA, 7.–10. Mai 2007, S. 1139/46.
12. Krieger, W.; Poferl, G.: Metallurgische und betriebliche Vorteile des LD-Prozesses mit Bodenspülung, Weiterbildungsunterlagen Voest, Linz, Österreich, 1982.
13. Schoeman, E.; Wagner, A.; Ebner, W.; Berger, M.: Implementation of basic oxygen furnace bottom purging at Mittal Steel Newcastle, RHI Bulletin (2006) Nr. 2, S. 7/11.
14. Kollmann, T.; Jandl, C.; Schenk, J.; Mizelli, H.; Höfer, W.; Viertauer, A.; Hiebler, M.: Comparison of basic oxygen furnace bottom gas purging options, RHI Bulletin (2012) No. 1, S. 8/15.
15. Krieger, W.: Poferl, G.; Apfolterer, R.: BHM 129 (1984), S. 188/95.

Language of full-text russian
Full content Buy
Back