| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Towards a Future of Sustainable Production and Processing of Metals and Alloys
|
| Presentation Title |
Accelerating Rate Limited Kinetics in Hydrogen-direct Iron Reduction: Combining Ptycho-Tomography and Percolation Insights |
| Author(s) |
Subhechchha Paul, Xueli Zheng, Lauren Moghimi, Yifan Wang, Leora Dresselhaus-Marais, Junjing Deng, Yan Ma, Dierk Raabe |
| On-Site Speaker (Planned) |
Subhechchha Paul |
| Abstract Scope |
The most C-intensive step of steelmaking is the coal-based reduction of iron ores (hematite-->magnetite-->wustite-->iron). When H2 is used in the reduced-C Direct Iron Reduction (DIR) process, multiscale phenomena hinder its scalability. Agglomeration of ore particles is a known detriment to the kinetics of DIR, halting continuous flow in reactors. We use ptycho-tomographic imaging to capture 3D maps of the formation and consumption of Wustite using nanoparticles representative of the smallest industrial ore fine particles. We observe sintering showing competing factors in the mass transport, nucleation, and mechanics of the sample during the reaction. We apply percolation theory to model how the pore connectivity drives acceleration in the kinetics of the rate-limiting final step of the reaction. Our study provides fundamental but scalable modelling insights to explore how to drive efficient chemistry for DIR. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Sustainability, Phase Transformations |