Characteristics of alkali-activated fly Ash-CO2 mineralization reaction and micro carbon sequestration mechanism

IF 4.6 3区工程技术 Q2 ENERGY & FUELS

International Journal of Greenhouse Gas Control Pub Date : 2025-04-23 DOI:10.1016/j.ijggc.2025.104377

Lei Qin , Siheng Lin , Haifei Lin , Shugang Li , Niandong Chen , Chengang Sun

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Abstract

The mineralization reaction characteristics of alkali-activated fly ash with CO₂ directly influence its carbon sequestration capacity. Investigating the micro-scale carbon sequestration mechanisms in alkali-activated fly ash mineralization reactions is essential for improving the efficiency of mineralization and sequestration of fly ash. This study focuses on lignite fly ash from a coal-fired power plant in Shijiazhuang, China. A closed mineralization reactor experimental platform and a pressure drop method were utilized to characterize carbonation performance. The experimental results indicate that the alkali activation treatment effectively enhances the mineralization and carbon sequestration performance of fly ash. Alkali-activated lignite fly ash post-mineralization reaction surfaces showed significant carbonate material presence. After mineralization reaction, the distribution of particle sizes of alkali-activated lignite fly ash increased. The C-O bonds in mineralized fly ash increase with the degree of alkali activation, indicating that alkali activation treatment enhance the carbon sequestration capability of lignite fly ash.

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碱活化粉煤灰- co2矿化反应特性及微固碳机理

碱激活粉煤灰与二氧化碳的矿化反应特性直接影响其固碳能力。研究碱激活粉煤灰矿化反应的微尺度固碳机理对于提高粉煤灰的矿化和固碳效率至关重要。本研究以中国石家庄某燃煤电厂的褐煤粉煤灰为研究对象。利用密闭矿化反应器实验平台和压降法来表征碳化性能。实验结果表明，碱活化处理可有效提高粉煤灰的矿化和固碳性能。碱活化后的褐煤粉煤灰矿化反应表面显示出明显的碳酸盐物质存在。矿化反应后，碱活化褐煤粉煤灰的粒度分布有所增加。矿化粉煤灰中的 C-O 键随碱活化程度的增加而增加，表明碱活化处理可提高褐煤粉煤灰的固碳能力。

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来源期刊

International Journal of Greenhouse Gas Control 环境科学-工程：环境

CiteScore

9.20

自引率

10.30%

发文量

199

审稿时长

4.8 months

期刊介绍： The International Journal of Greenhouse Gas Control is a peer reviewed journal focusing on scientific and engineering developments in greenhouse gas control through capture and storage at large stationary emitters in the power sector and in other major resource, manufacturing and production industries. The Journal covers all greenhouse gas emissions within the power and industrial sectors, and comprises both technical and non-technical related literature in one volume. Original research, review and comments papers are included.