Tamás Kurusta, Kitti Patrícia Klaj, Teemu Kinnarinen, Nazilah Bolourieh, Gábor Mucsi:
CO2 sequestration experiments by producing geopolymer specimens from lignite fly ash
Mineral-based CO₂ sequestration offers a permanent and safe way to store CO₂ by forming stable carbonates through reactions with calcium or magnesium-bearing materials. In a recent study, fly ash from Visonta (Northern Hungary) was mechanically activated and carbonated using a planetary ball mill under wet conditions. The resulting materials were evaluated as geopolymer-based construction products. CO₂ reacted with bassanite, the main calcium source, only in the presence of NaOH. Notably, a low NaOH concentration (0.5 M) improved compressive strength (up to 16.1 MPa), while higher concentrations hindered setting. At 2 M NaOH, samples remained plastically deformable. The study highlights the potential of low-alkali CO₂-treated fly ash in geopolymer applications.
https://ojs.uni-miskolc.hu/index.php/geosciences/article/view/3466/2731
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