Study on the sequestration capacity of fly ash on CO2 and employing the product to prevent spontaneous combustion of coal

Shao, Xu; Qin, Botao; Shi, Qi; Yang, Yintang; Ma, Zujie; Xu, Yizhen; Hao, Mingyue; Jiang, Zhe; Jiang, Wenjie

doi:10.1016/j.fuel.2022.126378

Cited by 21 publications

(10 citation statements)

References 39 publications

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Section: Co 2 Capture By Cao-modified Ashesmentioning

confidence: 99%

“…One typical example is reported by Shao X. et al in 2023 recently. [126] From Figure 8a and 8b, one can see the surface difference between the fly ash and the carbonated fly ash (CFA). The formal appears smooth on the particle surface, while the latter is rougher with Ca/MgCO 3 crystals decorated on the ash particle as highlighted by dotted squares.…”

Section: Co 2 Capture By Cao-modified Ashesmentioning

confidence: 99%

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Harnessing Ash for Sustainable CO₂Absorption: Current Strategies and Future Prospects

Wu,

Zhang,

Wang

et al. 2024

Chemistry An Asian Journal

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This review explores the potential of using different types of ash, namely fly ash, biomass ash, and coal ash etc., as mediums for CO2 capture and sequestration. The diverse origins of these ash types—municipal waste, organic biomass, and coal combustion—impart unique physicochemical properties that influence their suitability and efficiency in CO2 absorption. This review first discusses the environmental and economic implications of using ash wastes, emphasizing the reduction in landfill usage and the transformation of waste into value‐added products. Then the chemical/physical treatments of ash wastes and their inherent capabilities in binding or reacting with CO2 are introduced, along with current methodologies utilize these ashes for CO2 sequestration, including mineral carbonation and direct air capture techniques. The application of using ash wastes for CO2 capture are highlighted, followed by the discussion regarding challenges associated with ash‐based CO2 absorption approach. Finally, the article projects into the future, proposing innovative approaches and technological advancements needed to enhance the efficacy of ash in combating the increasing CO2 levels. By providing a comprehensive analysis of current strategies and envisioning future prospects, this review aims to contribute to the field of sustainable CO2 absorption and environmental management.

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Section: Co 2 Capture By Cao-modified Ashesmentioning

confidence: 99%

Section: Co 2 Capture By Cao-modified Ashesmentioning

confidence: 99%

Harnessing Ash for Sustainable CO₂Absorption: Current Strategies and Future Prospects

Wu,

Zhang,

Wang

et al. 2024

Chemistry An Asian Journal

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“…The combustion of coal gangue would release a considerable amount of toxic gases and fly ash, which contain multiple hazardous elements, including SO 2 , H 2 S, Pb, Hg, Cd, and so on. Also, among the fly ash exists combustible hydrocarbon polymers, which, at high temperatures, generate suspended particulates after reactions like oxidative decomposition and dehydrocarbonized polymerization; such particulates can bring about haze [4,5]. However, the elements generated by SCCG in complicated and diverse environments are found to be insidious and uncertain, and when these toxic and radioactive elements diffuse into the atmosphere and soil, problems such as human disease and environmental degradation ensue [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Solidification Behavior of Heavy Metal Pb2+ for Spontaneous Combustion Coal Gangue-Based Geopolymers

Liu,

Tang,

Wang

et al. 2024

Buildings

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Spontaneous combustion coal gangue (SCCG) is considered to be an aluminosilicate-based solid waste containing various toxic ions. The alkali-activation method for this material can not only fully use its potential hydration activity but also solidify the hazardous components to some extent. Through introducing additional Pb2+, the solidification behavior of heavy metal Pb2+ for an SCCG-based geopolymer was studied in the present paper. The solidification efficiencies were evaluated by Pb2+ leaching rates under neutral and acidic conditions, while its mechanism was explained by the methods of XRD, TG, FT-IR, SEM, and MIP. The results show that the Pb2+ solidification efficiency increases along with the curing age, and acidic rather than neutral conditions lead to a more intensive solidification capacity. Judging by the permissive maximum value of 5 mg/L, the Pb2+ original concentrations under neutral and acidic circumstances should be lower at 2.0 wt.% and 3.0 wt.%, respectively. The Pb2+ absorption is dominated by the physical process, due to the formation of no new hydration products. However, the Pb2+ addition would interrupt the reconstruction of the Si-Al network structure, slowing the accumulation of N-A-S-H gel and the densifying of the matrix. When the Pb2+ concentration grows, the sizes of hydration productions shrink continuously, more defects appear in the microstructure of the geopolymer, and the pore structure deteriorates rapidly, all of which accelerate the diffusion of toxic ions to the external condition.

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“…China is among the world’s largest energy producers, consumers, and carbon emitters . CO 2 generated by the spontaneous combustion of coal accounts for more than 3% of total CO 2 emissions, and a large amount of CO 2 from coalfield fires is released into the atmosphere. − To achieve the goal of carbon peaking and carbon neutrality at the earliest, it is imperative to prevent the risk of automatic coal combustion and reduce natural coal fires.…”

Section: Introductionmentioning

confidence: 99%

Study on the Preparation of Montmorillonite-Type Multiple Network Composite Gel for Coal Spontaneous Combustion and Its Firefighting Mechanism

et al. 2023

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This paper proposes a new montmorillonite-type multiple network composite gel for the prevention of coal spontaneous combustion. The first network is formed by the cross-linking of polyvinyl alcohol (PVA) and boric acid under alkaline conditions. The second network is formed as a result of intermolecular hydrogen-bonding interactions between polyacrylamide (PAM) and polyvinyl alcohol. Montmorillonite (MMT) is designed as the backbone material in the preparation of composite gels. The optimal ratios of the reactants of the composite gel were determined through orthogonal experiments. The experimental results showed that PVA had the greatest influence on the gelation time, whereas the PAM concentration had the strongest influence on the gel permeability. The optimal blending ratio was 4% MMT + 2.5% PVA + 1.5% PAM. The chemical performances of the composite colloids, such as inhibition rate, reactive functional groups, and kinetics, were investigated. Results showed that multiple network composite gels could effectively inhibit the coal spontaneous combustion reaction. Based on the principle of coal spontaneous combustion and the cross-linking network structure of the composite gel, the flame-retardant and fire-extinguishing mechanisms were also explored in terms of both physical and chemical inhibition pathways.

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Study on the sequestration capacity of fly ash on CO2 and employing the product to prevent spontaneous combustion of coal

Cited by 21 publications

References 39 publications

Harnessing Ash for Sustainable CO₂Absorption: Current Strategies and Future Prospects

Harnessing Ash for Sustainable CO₂Absorption: Current Strategies and Future Prospects

Solidification Behavior of Heavy Metal Pb2+ for Spontaneous Combustion Coal Gangue-Based Geopolymers

Study on the Preparation of Montmorillonite-Type Multiple Network Composite Gel for Coal Spontaneous Combustion and Its Firefighting Mechanism

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Study on the sequestration capacity of fly ash on CO2 and employing the product to prevent spontaneous combustion of coal

Cited by 21 publications

References 39 publications

Harnessing Ash for Sustainable CO2Absorption: Current Strategies and Future Prospects

Harnessing Ash for Sustainable CO2Absorption: Current Strategies and Future Prospects

Solidification Behavior of Heavy Metal Pb2+ for Spontaneous Combustion Coal Gangue-Based Geopolymers

Study on the Preparation of Montmorillonite-Type Multiple Network Composite Gel for Coal Spontaneous Combustion and Its Firefighting Mechanism

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Product

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Harnessing Ash for Sustainable CO₂Absorption: Current Strategies and Future Prospects

Harnessing Ash for Sustainable CO₂Absorption: Current Strategies and Future Prospects