About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fundamentals of Sustainable Metallurgy and Processing of Materials
|
| Presentation Title |
Direct reduction of iron oxides by hydrogen: Elucidating microstructure effects in sintered polycrystalline hematite |
| Author(s) |
Barak Ratzker, Martina Ruffino, Shiv Shankar, Yan Ma, Dierk Raabe |
| On-Site Speaker (Planned) |
Barak Ratzker |
| Abstract Scope |
Solid-state hydrogen-based direct reduction (HyDR) of metal oxides presents a promising route to reduce CO2 emissions in metal production industries. While prior studies have explored the influence of reduction conditions and feedstock properties on HyDR, a fundamental understanding of the governing microstructural factors remains essential for optimizing both the process and reactor design. In this work, we investigate the reduction kinetics of dense, sintered polycrystalline hematite with varying grain sizes as well as samples doped with alumina (as a representative stable oxide impurity) exposed to hydrogen at 700°C using thermogravimetric analysis. To complement the kinetic data, we performed detailed microstructural characterization of partially reduced samples to trace the evolution of key features during the reduction process. The effects of grain size and alumina impurities on the microstructural mechanisms are elucidated, highlighting the pivotal role of microstructural characteristics in the HyDR of metal oxides. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Sustainability, Process Technology, Composites |