Journal
CRYSTALS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/cryst11111314
Keywords
carbon dioxide; industrial waste; gas-solid carbonation; coal fly ash
Funding
- Government of Catalonia through the FI-2017 program for the recruitment of early-stage researchers [2017 FI_B00129]
- Erasmus Mundus Joint Doctoral Programme on Environomical Pathways to Sustainable Energy Services (SELECTp) [ENE2015-63969-C3-1-R]
- AGH [16.16.210.476]
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The research explores the carbonation of high-CaO fly ash using simulated flue gas and concentrated CO2, revealing higher efficiency with pure CO2 and significant variations in efficiency based on the CO2 concentration in the gas. The experiments resulted in a substantial reduction in free lime content, meeting European Standards for utilization in cement as additives.
The utilization of high-calcium fly ashes (HCFA) from coal-fired power plants in the construction industry is problematic, since their high free lime contents can lead to durability problems. In this research, the carbonation of a high-CaO fly ash has been carried out using simulated flue gas and concentrated CO2, with the aim to assess the valorization potential of such materials in the construction industry. The results show that, at 7 bars total pressure, an up to 36% carbonation efficiency can be achieved in just 30 min when pure CO2 is used; a comparable result with flue gas requires about 4 h of reaction. On the other hand, experiments carried out at atmospheric pressure show significantly different carbonation efficiencies depending on the CO2 concentration of the gas used. All experiments resulted in a substantial reduction in the original free lime content, and after reaction times of 4 h (at atmospheric pressure) and pressures of 7 bars (for any reaction time > 30 min), the final free lime values were low enough to comply with the requirements of European Standards for their utilization as additions in cement.
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