Usage of BOF slag and next generation EAF slag in the cement industry

  • Increasing amounts of new types of EAFS from the DRP-EAF-route and still significant amounts of BOFS from the DRP-SAF-BOF-route will be produced while BFS will vanish. In two BMBF funded research projects, BAM and FEhS examine the application of slags from future steel production in the cement industry. The project “SlagCEM” investigated the recovery of iron from BOFS while producing a mineral product with good cementitious properties. The reduction of BOFS to recover metallic iron along with the generation of a clinker-like material for the cement industry increases the viscosity of the BOFS. This would require a process at unfeasibly high temperatures of >1.700 °C. Therefore, SlagCEM aimed to modify the BOFS to reduce the viscosity to suitable ranges at lower temperatures of ~1.600 °C. A demonstration trial (20 tons) was carried out and the potential for substitution of OPC was determined. DRI-EOS investigates the utilization of increasing amounts of DRI-based EAFS in the cementIncreasing amounts of new types of EAFS from the DRP-EAF-route and still significant amounts of BOFS from the DRP-SAF-BOF-route will be produced while BFS will vanish. In two BMBF funded research projects, BAM and FEhS examine the application of slags from future steel production in the cement industry. The project “SlagCEM” investigated the recovery of iron from BOFS while producing a mineral product with good cementitious properties. The reduction of BOFS to recover metallic iron along with the generation of a clinker-like material for the cement industry increases the viscosity of the BOFS. This would require a process at unfeasibly high temperatures of >1.700 °C. Therefore, SlagCEM aimed to modify the BOFS to reduce the viscosity to suitable ranges at lower temperatures of ~1.600 °C. A demonstration trial (20 tons) was carried out and the potential for substitution of OPC was determined. DRI-EOS investigates the utilization of increasing amounts of DRI-based EAFS in the cement industry to compensate the reduced production of GBFS. This requires an adjustment of the slag’s chemical composition and a rapid quenching to create an amorphous structure with latent hydraulic characteristics. The project studies the behavior of the modified slag during the metallurgical process and during solidification, any possibly negative impact on the cementitious or environmental properties as well as the potential to recover metals such as Fe, Cr, Mo and V. The final results of the project “SlagCEM”, finished in 2024, as well as the current state and insights of the project “DRI-EOS”, started in July 2022, shall be presented in this talk.zeige mehrzeige weniger

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  • USAGE OF BOF SLAG AND NEXT GENERATION EAF SLAG IN THE CEMENT INDUSTRY_SVS_Joachim Schneider.pdf
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Autor*innen:Joachim Schneider
Koautor*innen:Burkart Adamczyk, Dominik Ebert, Andreas Ehrenberg, Katharina Schraut, Kevin Wendt, Felix Mayer, Jesko Gerlach, David Algermissen, Christian AdamORCiD
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2025
Organisationseinheit der BAM:4 Material und Umwelt
4 Material und Umwelt / 4.4 Thermochemische Reststoffbehandlung und Wertstoffrückgewinnung
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik
Freie Schlagwörter:Basic oxygen furnace (BOF); Cement; Electric arc furnace (EAF); Slag valorisation; Steel slags
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Infrastruktur / Green Intelligent Building
Umwelt
Umwelt / Circular Economy
Veranstaltung:9th International Slag Valorisation Symposium
Veranstaltungsort:Leuven, Belgium
Beginndatum der Veranstaltung:08.04.2025
Enddatum der Veranstaltung:11.04.2025
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:14.11.2025
Referierte Publikation:Nein
Eingeladener Vortrag (wissenschaftliche Konferenzen):Nein
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