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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 1
SUMMARY:New steelmaking processes: Implications for slag utilization
DESCRIPTION:The main challenge of the steel industry for the next decade is the steel production transformation process. The CO2 intensive blast furnace/BOF route will be substituted by a combination of Direct Reduced Iron (based on natural gas, later on "green" hydrogen) with an Electric Arc Furnace (EAF) or a Submerged Arc Furnace (SAF), heated with renewable energy. Thus, the well-known latent-hydraulic granulated blast furnace slag (GBS) being successfully used in cement and concrete since more than 140 years will vanish step by step! GBS is used as a supplementary cementitious material not only, but in particular due to its CO2 reduction potential in the cement/concrete production.

Whereas the DRI process itself does not generate any slag, EAF and SAF will do. EAF and SAF slags will be very different. The reasons are e.g. the different oxidizing (EAF) or reducing (SAF) atmospheres and different shares of scrap input (EAF). Moreover, the new EAF slags will be also different compared to today's scrap based EAF slag. For example, the heavy metal content will be lower (but much higher compared to GBS). However, specific slag/metal ratios, slag volumes, chemical and mineralogical compositions and physical properties of the new slags are yet unknown. Thus, also their cementitious and environmental properties are still unknown!

Different projects aim mainly to create slags being similar to GBS. The main objective is to offer furthermore a reactive material to the cement and concrete industry. The presentation gives an overview on the different approaches within the steel industry, main goals, main technical and legal challenges and some current FEhS projects. For example, "SaveCO2" - a project with thyssenkrupp Steel, HeidelbergMaterials et al. - is focused on the DRI/SAF route whereas "DRI-EOS" - a project with Salzgitter, Holcim et al. - is focused on the DRI/EAF route.

CLASS:PUBLIC
DTSTART:20230613T174500
DTEND:20230613T181500
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