REWAS 2022: Decarbonizing the Materials Industry: On-Demand Oral Presentations
Sponsored by: TMS Extraction and Processing Division, TMS: Recycling and Environmental Technologies Committee, TMS: Energy Committee, TMS: Process Technology and Modeling Committee, TMS: Aluminum Committee
Program Organizers: Camille Fleuriault, Eramet Norway; Christina Meskers, SINTEF; Mertol Gokelma, Izmir Institute of Technology; Elsa Olivetti, Massachusetts Institute of Technology; Jesse White, Kanthal AB; Chukwunwike Iloeje, Argonne National Laboratory; Neale Neelameggham, IND LLC; Kaka Ma, Colorado State University

Monday 8:00 AM
March 14, 2022
Room: Energy & Environment (including REWAS 2022 Symposia)
Location: On-Demand Room

Iron-ore Reduction Using Green Hydrogen: A Study for Recycling Wastes in Egyptian Steel Industry: Abdelrahman Aboseada¹; Tarek Hatem¹; ¹The British University in Egypt
    A new prospective in the Egyptian steelmaking industry using pure hydrogen to reduce waste iron ores in a two stage fluidized bed reactor through direct reduction process is presented, modeled and analyzed. The main advantage of applying this route to the steel industry is the enormous reduction in CO2 emissions compared to today's dominant routes that rely on the blast furnace – basic oxygen furnace (BF/BOF). Moreover, the hydrogen direct reduction (H-DR) process could be directly applied for the reuse of the waste imported lump iron ores that are been crashed during the transportation process to a small fines particles; making them unusable in blast furnace processes unless sintering process is applied. A complete study to verify the applicability of this idea in Egypt has been investigated and comparing it to current fluidized bed reactor using syngas as the reducing agent.

Supercritical Carbonation of Steelmaking Slag for the CO₂ Sequestration: Jihye Kim¹; Gisele Azimi¹; ¹University of Toronto
    Mineral carbonation of industrial byproducts is a promising carbon capture and storage technique to abate global warming. Steelmaking slag is the main byproduct of the steelmaking industry and it is a potential source of alkaline oxides, which can be transformed into carbonates. The carbonation of this steelmaking slag has proven to be a great countermeasure to sequester significant amounts of CO₂ emitted from the steelmaking process at the point sources. In this study, a supercritical carbonation process is developed to sequester CO₂ using steelmaking slag. A response surface methodology is utilized to assess the effect of operating parameters on carbonation efficiency and to optimize the process. Under the optimum conditions, the maximum CO₂ uptake of 213 gCO₂/kg_Slag is achieved. Fundamental investigations are performed to elucidate the carbonation mechanisms with emphasis on the diffusion barrier, rate-determining step, and reaction pathway.

Biomass as a CO2-neutral Carbon Substitute for Reduction Processes in Metallurgy: Christian Dornig¹; Jürgen Antrekowitsch¹; ¹Montanuniversität Leoben
    The increasing consumption of carbon-based products in recent decades and their impact on the environment and climate change is becoming more and more significant. To curb this problem, the use of pyrolyzed biomass as a reducing agent substitute for carbon-based reduction processes can be part of the solution for a CO2-neutral metallurgy. Previous research has shown that biochar can be a replacement for conventionally used carbon sources. However, the economic interest in this technology has gradually decreased, due to the falling prices for the CO2 certificates about eight years ago. In the meantime, the prices for the certificates have risen strongly again and the topic is coming back into focus. In this publication, the use of biomass was investigated in an experimental setup and the selection, properties and possible applications are discussed. The results show that biomass can be an adequate product for CO2-neutral process control.