Carbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry
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 co...
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2021
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oai:doaj.org-article:c9b15e6a97fe4af595f39641aaf118612021-11-25T17:18:09ZCarbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry10.3390/cryst111113142073-4352https://doaj.org/article/c9b15e6a97fe4af595f39641aaf118612021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1314https://doaj.org/toc/2073-4352The 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 CO<sub>2</sub>, 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 CO<sub>2</sub> 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 CO<sub>2</sub> 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.Kwon RausisAgnieszka ĆwikIgnasi CasanovaKatarzyna ZarębskaMDPI AGarticlecarbon dioxideindustrial wastegas–solid carbonationcoal fly ashCrystallographyQD901-999ENCrystals, Vol 11, Iss 1314, p 1314 (2021) |
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carbon dioxide industrial waste gas–solid carbonation coal fly ash Crystallography QD901-999 |
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carbon dioxide industrial waste gas–solid carbonation coal fly ash Crystallography QD901-999 Kwon Rausis Agnieszka Ćwik Ignasi Casanova Katarzyna Zarębska Carbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry |
| description |
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 CO<sub>2</sub>, 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 CO<sub>2</sub> 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 CO<sub>2</sub> 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. |
| format |
article |
| author |
Kwon Rausis Agnieszka Ćwik Ignasi Casanova Katarzyna Zarębska |
| author_facet |
Kwon Rausis Agnieszka Ćwik Ignasi Casanova Katarzyna Zarębska |
| author_sort |
Kwon Rausis |
| title |
Carbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry |
| title_short |
Carbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry |
| title_full |
Carbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry |
| title_fullStr |
Carbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry |
| title_full_unstemmed |
Carbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry |
| title_sort |
carbonation of high-ca fly ashes under flue gas conditions: implications for their valorization in the construction industry |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/c9b15e6a97fe4af595f39641aaf11861 |
| work_keys_str_mv |
AT kwonrausis carbonationofhighcaflyashesunderfluegasconditionsimplicationsfortheirvalorizationintheconstructionindustry AT agnieszkacwik carbonationofhighcaflyashesunderfluegasconditionsimplicationsfortheirvalorizationintheconstructionindustry AT ignasicasanova carbonationofhighcaflyashesunderfluegasconditionsimplicationsfortheirvalorizationintheconstructionindustry AT katarzynazarebska carbonationofhighcaflyashesunderfluegasconditionsimplicationsfortheirvalorizationintheconstructionindustry |
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1718412558077001728 |