About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermodynamics for Sustainability: An EPD Symposium in Honor of Kazuki Morita
|
| Presentation Title |
Phase Equilibrium Study of Lead Slag in Lead-acid Battery Recycling |
| Author(s) |
Xi Ling |
| On-Site Speaker (Planned) |
Xi Ling |
| Abstract Scope |
In the pyrometallurgical process of secondary lead recycling, a desulfurizing agent, such as Na2CO3 is added to minimize the emissions of Sulphur into the atmosphere, while silica is introduced into the smelter as a fluxing material. Subsequently, a significant amount of Na2O and SiO2 remain in the downstream reverberatory furnace and blast furnace slags. Presently, there is limited understanding of the thermodynamic behavior of silicate-based lead slags rich in Na2O, posing challenges in accurately determining the optimal conditions for targeted lead metal recovery and final slag composition. In this work, the equilibrium phase relations of the Na2O-SiO2 system and the PbO-Na2O-SiO2 system are studied via equilibration-quenching-microanalysis method. The results were then compared to those of previous studies, and any discrepancies were resolved. Experimental data combined with available data in the literature were used in the development of thermodynamic model using CALPHAD approach. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Pyrometallurgy, Recycling and Secondary Recovery, Sustainability |