Experimental Study on Direct and Indirect Carbonation of Fly Ash from Fluidized Bed Combustion of Lignite

Marek Tańczyk (), Jolanta Jaschik, Andrzej Kołodziej, Anna Pawlaczyk-Kurek, Aleksandra Janusz-Cygan and Łukasz Hamryszak
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Marek Tańczyk: Institute of Chemical Engineering, Polish Academy of Sciences, ul. Bałtycka 5, 44-100 Gliwice, Poland
Jolanta Jaschik: Institute of Chemical Engineering, Polish Academy of Sciences, ul. Bałtycka 5, 44-100 Gliwice, Poland
Andrzej Kołodziej: Institute of Chemical Engineering, Polish Academy of Sciences, ul. Bałtycka 5, 44-100 Gliwice, Poland
Anna Pawlaczyk-Kurek: Institute of Chemical Engineering, Polish Academy of Sciences, ul. Bałtycka 5, 44-100 Gliwice, Poland
Aleksandra Janusz-Cygan: Institute of Chemical Engineering, Polish Academy of Sciences, ul. Bałtycka 5, 44-100 Gliwice, Poland
Łukasz Hamryszak: Institute of Chemical Engineering, Polish Academy of Sciences, ul. Bałtycka 5, 44-100 Gliwice, Poland

Energies, 2025, vol. 18, issue 19, 1-21

Abstract: The research problem was to determine the possibility of aqueous mineral carbonation using fly ash from lignite fluidized bed combustion. Both direct and indirect routes were used. The innovative nature of the research consisted of conducting experiments at atmospheric pressure and ambient temperature (20 °C). The synthetic gas mixture with composition analogical to the flue gas (nitrogen and up to 16 vol.% of carbon dioxide) was used. The experiments proved that almost all CO 2 from the gas was chemically bound at pH > 12. The sequestration capacity of studied fly ash is about 55–76 g CO 2 per 1 kg of ash in the case of the indirect method, and 80–95 g CO 2 per 1 kg of ash for the direct route. These values are similar to those presented in the literature, but unlike most publications, they were obtained under ambient conditions, which can significantly reduce the costs of the process.

Keywords: sequestration of CO 2; mineral carbonation; aqueous carbonation; industrial waste; utilization of fly ash (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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