Mineralization and storage of carbon dioxide by the fly ash from co-firing of municipal sludge and coal
In order to explore the treatment method of co-firing municipal sludge and coal in power plants and utilizing the fly ash to mineralize CO2,the ability and influencing factors were studied.The characterization of the fly ash and the mineralized ash were conducted,and their mineralization mechanism was studied.The results showed that the co-fired fly ash contained a large amount of Ca and Mg with high reactivity,and had a strong ability to mineralize CO2.The optimal reaction conditions were 3％mass concentration of sodium carbonate solution,CO2 flow rate of 200 mL·min-1,fly ash dosage of 50 g·L-1,temperature of 100 ℃,and reaction time of 80 min.Under such conditions,the maximum amount of CO2 mineralized and stored per unit of fly ash can reach 125.05 mg·g-1.The microstructure of mineralized ash had undergone significant changes,with a large amount of calcium ions in the co-fired fly ash dissolving out and carbonate precipitation formed through carbonation.This waste treatment model was expected to promote the hazard neutralization,volume reduction,and waste utilization of municipal sludge on a large scale,and achieve reduction in carbon emissions in coal-fired power plants nearby,further expanding the field of large-scale comprehensive utilization of fly ash.
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