About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Energy Technologies and CO2 Management: Resource Efficient Processes
|
| Presentation Title |
Thermodynamic Analysis of Fe-Si Alloy and CaCO3 Prepared From Steel Slag By Molten Salt Electrolysis Under CO2 Atmosphere |
| Author(s) |
Pengzhen Li, Ying Chen, Bo Yuan, Yan Wang, Hongyan Yan |
| On-Site Speaker (Planned) |
Pengzhen Li |
| Abstract Scope |
Under the background of dual carbon goals, solid waste treatment and CO₂ utilization have become hot issues of global concern. To explore the resource utilization of steel slag and waste gas, this paper proposed a research idea for preparing Fe-Si alloys and CaCO3 by molten salt electrolysis of steel slag in NaCl-KCl system under CO2 atmosphere. The theoretical feasibility was analyzed through thermodynamic calculations. The results showed that no chemical reactions occurred between components of steel slag and molten salt at 750 ~ 950 ℃. Electroreduction sequence of metals in the steel slag was Fe, Si, Ca and Al. Combined with the slag components and Fe-Si phase diagram, under a voltage of -2.21 V to -1.51 V, the electroreduction of Fe and Si finally formed Fe3Si, FeSi2, FeSi and Fe5Si3. As deoxidation proceeds, CaO can be dissociated from the CaO-containing phase in steel slag, and then reacted with CO2 to form CaCO3. Under above thermodynamic conditions, it was theoretically feasible to prepare Fe-Si alloy and CaCO3 from molten salt electrolytic steel slag under CO2 atmosphere. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Recycling and Secondary Recovery, Electrometallurgy, Extraction and Processing |