Production of aragonite whiskers by carbonation of fine recycled concrete wastes: An alternative pathway for efficient CO2 sequestration

In this study, a wet carbonation method targeting high carbonation rate was developed to prepare aragonite whisker using fine recycled concrete waste (FRCW), aiming to effectively capture CO2 and convert FRCW into high-value products. The effect of operational factors, including MgCl2 concentration,...

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Bibliographic Details
Published in:Renewable & sustainable energy reviews 2023-03, Vol.173, p.113079, Article 113079
Main Authors: Shen, Peiliang, Jiang, Yi, Zhang, Yangyang, Liu, Songhui, Xuan, Dongxing, Lu, Jianxin, Zhang, Shipeng, Poon, Chi Sun
Format: Article
Language:English
Subjects:
Amorphous calcium carbonate
Aragonite whiskers
Carbonation
Magnesium
Recycled concrete wastes
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Summary:In this study, a wet carbonation method targeting high carbonation rate was developed to prepare aragonite whisker using fine recycled concrete waste (FRCW), aiming to effectively capture CO2 and convert FRCW into high-value products. The effect of operational factors, including MgCl2 concentration, temperature, CO2 concentration and duration on the formation of aragonite was systemically investigated. The results indicated this carbonation process can not only produce needle-like aragonite whisker-rich materials but also capture a large amount of CO2 (0.19 g CO2 per g FRCW) within an hour. The MgCl2 concentration and temperature were key parameters governing the nucleation of aragonite, while the formation of needle-like aragonite was favored in a MgCl2-FRCW suspension with a minimum Mg2+/Ca2+ molar ratio >0.16 at a temperature >60 °C. A lower CO2 concentration of
ISSN:1364-0321
1879-0690
DOI:10.1016/j.rser.2022.113079