Synergistic CO2 mineralization using coal fly ash and red mud as a composite system

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-05-09 DOI:10.1007/s40789-024-00672-2
Zhenchao Yao, Yugao Wang, Jun Shen, Yanxia Niu, Jiang Feng Yang, Xianyong Wei
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Abstract

CO2 mineralization plays a critical role in the storage and utilization of CO2. Coal fly ash (CFA) and red mud (RM) are widely utilized as CO2 mineralizers. However, the inert calcium species in CFA limit its carbonation capacity, meanwhile the substantial Ca2+ releasing of RM is hindered by a covering layer of calcium carbonate. In this study, CO2 mineralization in a composite system of CFA and RM was investigated to enhance the carbonation capacity. Multiple analyzers were employed to characterize the raw materials and resulting mineralization products. The results demonstrated that a synergistic effect existed in the composite system of CFA and RM, resulting in improving CO2 mineralization rate and efficiency. The produced calcium carbonate was ectopically attached the surface of CFA in the composite system, thus slowing down its coverage on the surface of RM. This phenomenon facilitated further releasing Ca2+ from the internal RM, thereby enhancing CO2 mineralization efficiency. Meanwhile, the inclusion of RM significantly improved the alkalinity of the composite system, which not only promoted the dissolution of Ca2+ of the inert CaSO4(H2O)2 in CFA, but also accelerated CO2 mineralization rate. The investigation would be beneficial to CO2 mineralization using industrial solid wastes.

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利用粉煤灰和赤泥作为复合系统协同进行二氧化碳矿化
二氧化碳矿化在二氧化碳的储存和利用中起着至关重要的作用。粉煤灰(CFA)和赤泥(RM)被广泛用作二氧化碳矿化剂。然而,粉煤灰中的惰性钙限制了其碳化能力,而赤泥中大量 Ca2+ 的释放则受到碳酸钙覆盖层的阻碍。本研究对 CFA 和 RM 复合体系中的二氧化碳矿化进行了研究,以提高其碳化能力。采用多种分析仪对原材料和矿化产物进行了表征。结果表明,CFA 和 RM 复合体系存在协同效应,从而提高了二氧化碳矿化率和效率。在复合体系中,生成的碳酸钙异位附着在 CFA 表面,从而减缓了其在 RM 表面的覆盖速度。这种现象有助于进一步释放 RM 内部的 Ca2+,从而提高 CO2 矿化效率。同时,RM 的加入显著提高了复合体系的碱度,不仅促进了 CFA 中惰性 CaSO4(H2O)2 中 Ca2+ 的溶解,还加快了 CO2 矿化速度。这项研究将有助于利用工业固体废物进行二氧化碳矿化。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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