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Production of a hydraulic material from post treated steelmaking slags

  • Steelmaking slag is a by-product of steel production, of which 4.5 Mt were produced in 2020 in Germany alone. It is mainly used in road construction, earthwork and hydraulic engineering. A smaller part is returned to the metallurgical cycle, used as fertiliser or landfilled. With this use, iron oxides still contained in steelmaking slag are lost. In addition, the possibility of producing higher-grade products from steelmaking slag is foregone. In recent decades, many researchers have investigated the production of Portland cement clinker and crude iron from basic oxygen furnace slags (BOFS) via a reductive treatment. Carbothermal treatment of liquid BOFS causes a reduction of iron oxides to metallic iron, which separates from the mineral phase due to its higher density. Simultaneously, the chemical composition of the reduced slag is adapted to that of Portland cement clinker. In this study, German BOFS was reduced in a small-scale electric arc furnace using petrol coke as a reducingSteelmaking slag is a by-product of steel production, of which 4.5 Mt were produced in 2020 in Germany alone. It is mainly used in road construction, earthwork and hydraulic engineering. A smaller part is returned to the metallurgical cycle, used as fertiliser or landfilled. With this use, iron oxides still contained in steelmaking slag are lost. In addition, the possibility of producing higher-grade products from steelmaking slag is foregone. In recent decades, many researchers have investigated the production of Portland cement clinker and crude iron from basic oxygen furnace slags (BOFS) via a reductive treatment. Carbothermal treatment of liquid BOFS causes a reduction of iron oxides to metallic iron, which separates from the mineral phase due to its higher density. Simultaneously, the chemical composition of the reduced slag is adapted to that of Portland cement clinker. In this study, German BOFS was reduced in a small-scale electric arc furnace using petrol coke as a reducing agent. The resulting low-iron mineral product has a similar chemical composition to Portland cement clinker and was rich in the tricalcium silicate solid solution alite (Ca3SiO5). Based on its chemical and mineralogical composition, similar to that of Portland cement clinker, the reduced BOFS has the potential to react comparably. In our study, the reduced BOFS produced less hydration heat than OPC, and its hydraulic reaction was delayed. However, adding gypsum has shown to accelerate the hydration rate of the reduced BOFS compared to that known from the calcium silicates of Portland cement clinker. Further research to improve the hydraulic properties of the reduced slag is essential. If successful, producing a hydraulic binder and crude iron from BOFS has economic and ecological benefits for both the cement and steel industries.zeige mehrzeige weniger
Metadaten
Persönliche Herausgeber*innen:Katharina Schraut, Burkart Adamczyk, Christian Adam, D. Stephan, Sebastian Simon, Julia von Werder, Birgit Meng
Dokumenttyp:Tagungsband (Herausgeberschaft für den kompletten Band)
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Further Reduction of CO2 -Emissions and Circularity in the Cement and Concrete Industry
Jahr der Erstveröffentlichung:2023
Organisationseinheit der BAM:4 Material und Umwelt
4 Material und Umwelt / 4.4 Thermochemische Reststoffbehandlung und Wertstoffrückgewinnung
7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.1 Baustoffe
9 Komponentensicherheit
9 Komponentensicherheit / 9.0 Abteilungsleitung und andere
Veröffentlichende Institution:Bundesanstalt für Materialforschung und -prüfung (BAM)
Verlagsort:Bangkok
Erste Seite:432
Letzte Seite:436
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik
Freie Schlagwörter:Alite; Clinker substitute; Hydraulic reactivity; Steelmaking slag
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Material
Umwelt
Umwelt / Circular Economy
Veranstaltung:The 16th International Congress on the Chemistry of Cement 2023 (ICCC2023)
Veranstaltungsort:Bangkok, Thailand
Beginndatum der Veranstaltung:18.09.2023
Enddatum der Veranstaltung:22.09.2023
URN:urn:nbn:de:kobv:b43-590522
URL:https://www.iccc-online.org/archive/
Verfügbarkeit des Dokuments:Datei für die Öffentlichkeit verfügbar ("Open Access")
Lizenz (Deutsch):License LogoCreative Commons - CC BY-ND - Namensnennung - Keine Bearbeitungen 4.0 International
Datum der Freischaltung:07.12.2023
Referierte Publikation:Nein
Schriftenreihen ohne Nummerierung:Wissenschaftliche Artikel der BAM
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