About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Recycling and Environmental Technologies
|
| Presentation Title |
pH-Controlled Indirect Carbonation of BOF Slags with In-Situ Potentiometric Monitoring |
| Author(s) |
Melis Ece Tatar, Seniz Ucar |
| On-Site Speaker (Planned) |
Melis Ece Tatar |
| Abstract Scope |
Mineral carbonation offers a viable strategy to mitigate CO₂ emissions by converting calcium-rich industrial residues into stable carbonates. Despite being thermodynamically favorable, carbonation of alkaline wastes often faces kinetic limitations and inconsistent product properties. This study uses basic oxygen furnace (BOF) steel slag (>40 wt% Ca) as a feedstock for indirect carbonation. Leaching with 1 M ammonium chloride creates a mildly alkaline environment (pH ~8.0), enabling efficient calcium extraction and carbonation. A synthetic model system is employed to investigate pH-sensitive reaction pathways using in situ pH and calcium activity measurements. Carbonate equilibria are stabilized with an ammonia buffer at pH ~10.6, achieving >80% CaCO₃ conversion within 30 minutes. Early-stage precipitation behavior suggests possible involvement of amorphous intermediates, warranting further investigation. Mechanistic insights are applied to BOF leachates to assess the influence of impurities on carbonation kinetics and pathways. This integration advances scalable CO₂ mineralization through controlled reaction chemistry and industrial waste valorization. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Recycling and Secondary Recovery, Sustainability, Powder Materials |