Marble Wastes as a Calcareous Sorbent for SO2 Control in Thermal Power Plants

In this study, the possibility of using marble wastes for SO2 control in coal-fired thermal power plants was assessed. The goal is suggesting marble wastes as an altarnative calcareous sorbent to limestones for use in WFGD systems. Chemical compositions, specific surface areas, grindabilities, reactivities and SO2 capture capabilities of different marble wastes were identified and compared with three different limestones that are currently in use in thermal power plants. Marble wastes had higher or comparable CaCO3 and varying extents of MgCO3 Both limestones and marble mastes were characterized as low-surface area sorbents with similar specific surface area values. Marble wastes generally showed higher liability to size reduction, suggesting an important advantage regarding the energy consumption in the sorbent preparation phase. Reactivity of the sorbents were highly sorbent specific. Some waste types showed higher or comparable dissolution rates as compared to the limestones while some resulted in a relatively slower dissolution. Calcite and dolomite contents dictate reactivities and an increase in MgCO3 adversely affect liability of the sorbent to dissolution. Assessment of the gas emission profiles during combustion by EGA-FTIR also pointed to better or comparable SO2 capture for some marble waste types in comparison with limestones. SO2 control was linked with the extent of calcite in the sorbents. Overall, findings suggest that an opportunity exists for utilizing marble wastes as an alternative to limestone in WFGD, provided that the key sorbent features and requirements are assessed and justified
Proceedings of the 5th World Congress on Mechanical, Chemical, and Material Engineering (MCM'19), (15-17 August 2019)


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Citation Formats
N. E. Altun, “Marble Wastes as a Calcareous Sorbent for SO2 Control in Thermal Power Plants,” presented at the Proceedings of the 5th World Congress on Mechanical, Chemical, and Material Engineering (MCM′19), (15-17 August 2019), Lisbon, Portugal, 2019, Accessed: 00, 2021. [Online]. Available: