Reduction of Iron‐Ore Pellets Using Different Gas Mixtures and Temperatures

Korobeinikov, Yuri; Meshram, Amogh; Harris, Christopher; Kovtun, Olexandr; Govro, Joe; O’Malley, Ronald J.; Volkova, Olena; Sridhar, Seetharaman

doi:10.1002/srin.202300066

Title: Reduction of Iron‐Ore Pellets Using Different Gas Mixtures and Temperatures

Journal Article · Sun Jul 16 00:00:00 EDT 2023 · Steel Research International

DOI:https://doi.org/10.1002/srin.202300066· OSTI ID:1995324

^[1];

^[1]; Harris, Christopher ^[2]; Kovtun, Olexandr ^[3]; Govro, Joe ^[4];

^[4];

^[3]; Sridhar, Seetharaman ^[1]

Ira A. Fulton School of Engineering Arizona State University Tempe AZ 85281 USA
Voestalpine AG Linz Austria
Institute of Iron and Steel Technology Freiberg University of Mining and Technology Freiberg 09599 Saxony Germany
Kent D. Peaslee Steel Manufacturing Research Center (PSMRC) Missouri University of Science and Technology Rolla MO 65409 USA

Direct reduction of iron ore (DRI) is gaining an increased attention due to the growing need to decarbonize industrial processes. The current industrial DRI processes are performed using reformed natural gas, which results in CO ₂ emission, although it is less than carbothermic reduction in the blast furnace. Carbon‐free reduction may be realized through the utilization of green H ₂ as a reducing agent, in place of natural gas. Herein, the effects of various gas mixtures and temperature on the reduction kinetics of the hematite iron‐ore pellets are focused on in this work. Pellets are reduced at 700, 800, 850, and 900 °C in hydrogen and using various gas mixes at 850 °C. Morphology of the pellets is investigated with the help of scanning electron microscopy and mercury intrusion porosimetry. The effects of temperature and gas composition on the reduction kinetics and porosity of the pellets are discussed. A notable effect of reduction rate on the internal structure of the pellets is detected, slower reduction rate yielded bigger pores offsetting the gas composition. Higher temperature results in coarser pores and higher porosity. Increase of CO content in the gas mix also leads to bigger pore size.

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Sponsoring Organization:: USDOE

OSTI ID:: 1995324

Journal Information:: Steel Research International, Journal Name: Steel Research International; ISSN 1611-3683

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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