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End-of-Life Carbon Fiber Reinforced Polymers in Steelmaking - Accessing a C-Rich Residue Stream as Alternative Reducing Agent

  • As one of the most energy and carbon consuming industries, steelmakers have an intrinsic interest in the development of technologies, reducing their carbon footprint as well as their carbon input. Besides generating new feedstocks from biomass or waste polymers, the valorization of carbon fiber reinforced polymer (CFRP) waste streams seems to be extremely promising based on the high carbon content of carbon fibers (CF), chars from CFRP and even unprocessed CFRP waste of >92%, 98% and 79%, respectively. Although, reduction of environmental impact from those high-performance materials was achieved by the development of smart recycling solutions, the continuous truncation by mechanical treatment of CF over multiple cycles, analogous to paper fibers, and the large global CFRP waste stream of 62 kt/a demand for a sustainable management of end-of-life (EOL) CFRP. Recently it was demonstrated that CF can be used safely as reductant in pyrometallurgical processes in a downhole electric furnaceAs one of the most energy and carbon consuming industries, steelmakers have an intrinsic interest in the development of technologies, reducing their carbon footprint as well as their carbon input. Besides generating new feedstocks from biomass or waste polymers, the valorization of carbon fiber reinforced polymer (CFRP) waste streams seems to be extremely promising based on the high carbon content of carbon fibers (CF), chars from CFRP and even unprocessed CFRP waste of >92%, 98% and 79%, respectively. Although, reduction of environmental impact from those high-performance materials was achieved by the development of smart recycling solutions, the continuous truncation by mechanical treatment of CF over multiple cycles, analogous to paper fibers, and the large global CFRP waste stream of 62 kt/a demand for a sustainable management of end-of-life (EOL) CFRP. Recently it was demonstrated that CF can be used safely as reductant in pyrometallurgical processes in a downhole electric furnace without significant WHO fiber emission. Therefore we anticipate a huge potential of CF based materials as sustainable reductant for steelmaking in an electric arc furnace (EAF). To facilitate the applicability of EOL CFRP in steelmaking, we investigated the interaction between CF based materials and liquid metal phases, appearing during the process, on different scales. Particularly, we examined the reactivity, wettability and dissolution behavior of CF and CFRP concerning liquid slag and steel. The presented results indicate that understanding the impact of the microstructure of CF on their behavior is crucial for their application in EAF steelmaking without risking potential hazards by WHO fiber emission. Besides the detailed elucidation of structure reactivity relationships of CF, the broader impact on circular economy will be presented.zeige mehrzeige weniger

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Metadaten
Autor*innen:Florian Loose
Koautor*innen:K. Schlögel, J. Hee, Burkart Adamczyk, Adib Hanna, P. Quicker, Christian Adam
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2020
Organisationseinheit der BAM:4 Material und Umwelt
4 Material und Umwelt / 4.4 Thermochemische Reststoffbehandlung und Wertstoffrückgewinnung
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik
Freie Schlagwörter:Carbon Fibers; Electric Arc Furnace; Secondary Recources; Steelmaking; Sustainability
Themenfelder/Aktivitätsfelder der BAM:Umwelt
Umwelt / Circular Economy
Veranstaltung:ESTEP Workshop Resi4Future: Residue valorization in iron and steel industry - sustainable solutions for a cleaner and more competitive future Europe
Veranstaltungsort:Online meeting
Beginndatum der Veranstaltung:20.11.2020
Enddatum der Veranstaltung:20.11.2020
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:23.11.2020
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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