4.5 Review

A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

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

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Summary: This study proposes an innovative approach to utilize fly ash waste for CO2 sequestration and prevent spontaneous combustion of coal. The experiments show that the quantity and rate of CO2 sequestration are influenced by the initial CO2 pressure and water-to-solid ratio. The study also demonstrates that carbonated fly ash slurry can reduce the specific surface area and pore volume of coal and effectively inhibit spontaneous combustion of coal.
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Study on the composite gravel preparation and the synergistic absorption of CO2 by fly ash of CFB boiler

Ke Ren et al.

Summary: The cooperative treatment of fly ash and fuel gas of coal-fired plants is a promising way to prepare composite gravel. The experimental results showed that the main hydration and carbonation products of the composite gravel were C-S-H gel, ettringite, and calcite. The addition of gypsum promoted the formation of hydration and carbonation products and increased the porosity and main pore diameter, which determined the strength of the composite gravel. This study provided a theoretical support for the preparation of composite gravel as a substitute for river sand and natural gravel.
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Kinetic analysis on CO2 sequestration from flue gas through direct aqueous mineral carbonation of circulating fluidized bed combustion fly ash

Endong Miao et al.

Summary: The suitability of fly ash from a 600 MW circulating fluidized bed boiler for CO2 sequestration through a direct aqueous route was evaluated. The fly ash exhibited favorable carbon capture characteristics and a maximum CO2 sequestration capacity of 0.128 g CO2/g CFA with a carbonation efficiency of 78.17%. A modified shrinking core model was proposed to determine the gas-liquid-solid carbonation kinetics, considering gaseous CO2 dissolution and time-dependent diffusion. The model accurately represents the carbonation process and can be applied to other solid wastes.
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Hierarchical porous nanosilica derived from coal gasification fly ash with excellent CO2 adsorption performance

Yanfang Liu et al.

Summary: The preparation of hierarchical porous nanosilica using coal gasification fly ash as a silicon source was achieved by microwave-assisted alkaline extraction followed by hydrothermal synthesis. This method showed fast and efficient silicon extraction with less impurity metal ions. The use of specific compounds as swelling agents induced intergranular pores, which significantly improved the CO2 adsorption capacity of the nanosilica. The isosteric heat of adsorption indicated the presence of both physisorption and chemisorption in the adsorption process.

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Study on CO2 adsorption capacity and kinetic mechanism of CO2 adsorbent prepared from fly ash

Baihe Guo et al.

Summary: The use of fly ash to prepare aerogel support for CO2 adsorption was studied. The results showed that the aerogel support made from fly ash had good microscopic properties and achieved high adsorption capacity under certain conditions.

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Article Engineering, Environmental

Feasibility and mechanism of an amine-looping process for efficient CO2 mineralization using alkaline ashes

Long Ji et al.

Summary: This study investigated the feasibility and mechanism of using industrial alkaline solid wastes in the amine-looping process, showing that the selected ashes had higher CO2 removal efficiencies and sequestration capacities in amine solutions. Amines played important roles in promoting CO2 mass transfer and producing small-sized CaCO3 in this process.

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Carbon capture and storage using coal fly ash with flue gas

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Summary: The study on CO2 sequestration using Indian coal fly ash revealed that aqueous carbonation has a higher sequestration capacity, while gas-solid carbonation is significantly impacted by temperature and pressure.

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Mineralization characteristics of coal fly ash in the transition from non-supercritical CO2 to supercritical CO2

Qixin Yuan et al.

Summary: The accelerated mineralization of fly ash is a potential way to reduce CO2 emissions. Supercritical CO2 can improve mineralization efficiency and the presence of water promotes mineralization.
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Supercritical CO2 coupled with mechanical force to enhance carbonation of fly ash and heavy metal solidification

Qixin Yuan et al.

Summary: The study found that coupling supercritical CO2 with mechanical force can enhance the carbonation efficiency of fly ash and effectively immobilize heavy metals. Carbon sequestration and efficiency under supercritical CO2 conditions were significantly higher than under low-pressure conditions, while mechanical ball milling modification also improved the carbonation efficiency.
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CO2 Capture by Fly Ash/Hydrated Lime Sorbents at Low Temperatures

Chiung-Fang Liu et al.

Summary: The study investigated the capture of CO2 using fly ash/hydrated lime sorbents under low-temperature and humid conditions. The results showed that the addition of fly ash improved the capture efficiency, and the reaction was more influenced by humidity than temperature and CO2 concentration.

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH (2022)

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Novel PEI@CSH adsorbents derived from coal fly ash enabling efficient and in-situ CO2 capture: The anti-urea mechanism of CSH support

Fan Qu et al.

Summary: This study proposes a novel eco-friendly method to achieve efficient and stable solid amine adsorbents. A calcium silicate hydrate (CSH) support with high pore volume is synthesized from coal fly ash (CFA) and then PEI@CSH adsorbents are prepared. The adsorbent exhibits high adsorption capacity, excellent cyclic stability, and low cost, making it applicable for CO2 mitigation in coal-fired power plants.

JOURNAL OF CLEANER PRODUCTION (2022)

Article Engineering, Environmental

Glycine-mediated leaching-mineralization cycle for CO2 sequestration and CaCO3 production from coal fly ash: Dual functions of glycine as a proton donor and receptor

Xuan Zheng et al.

Summary: This study proposes a novel glycine-mediated leaching-mineralization cycle (LMC) process that can efficiently produce high-purity CaCO3 from coal fly ash. The process shows good stability based on experimental results.

CHEMICAL ENGINEERING JOURNAL (2022)

Article Chemistry, Physical

Surface Modification of Synthetic Zeolites with Ca and HDTMA Compounds with Determination of Their Phytoavailability and Comparison of CEC and AEC Parameters

Michal Lach et al.

Summary: This paper presents the surface modification studies of synthetic zeolites and their characteristics. The results show that modification with Ca ions and HDTMA surfactant only improves the sorption of sulfates. The zeolite material without modification exhibits good release capacity, indicating its potential use as fertilizer additives.

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Direct Air Capture and Sequestration of CO2 by Accelerated Indirect Aqueous Mineral Carbonation under Ambient Conditions

Raghavendra Ragipani et al.

Summary: Mineralization of gaseous carbon dioxide into solid carbonates using alkaline industrial residues has the potential to reduce carbon dioxide emissions and improve ash utilization. This study demonstrates the feasibility of coupling mineral carbonation with direct air capture under atmospheric conditions, achieving high carbonation efficiency with alkaline conditions. The proposed process shows promising techno-economic and life cycle assessments, making it a low-cost option for negative emissions.

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Status and Outlook of Oil Field Chemistry-Assisted Analysis during the Energy Transition Period

Bao Jia et al.

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Study on the accelerated carbonation of MSWI fly ash under ultrasonic excitation: CO2 capture, heavy metals solidification, mechanism and geochemical modelling

Jie Chen et al.

Summary: The ultrasonic chemical method coupled with wet-carbonization technology can improve CO2 capture capacity, inhibit heavy metals release, and enhance solidification efficiency in municipal solid waste incineration fly ash, showing potential for economical, environmentally friendly, and resource-based applications.

CHEMICAL ENGINEERING JOURNAL (2022)

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Protonated amines mediated CO2 mineralization of coal fly ash and polymorph selection of CaCO3

Yunxie Huang et al.

Summary: The feasibility of using protonated amine as reagent in coal fly ash based leaching-mineralization process was demonstrated, achieving effective Ca leaching, CaCO3 precipitation, and protonated amine regeneration. Different types of amines with varying pKa values and side-chain lengths were shown to significantly influence the reaction process and product properties.

CHEMICAL ENGINEERING JOURNAL (2022)

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Circular indirect carbonation of coal fly ash for carbon dioxide capture and utilization

Hsing-Jung Ho et al.

Summary: Mineral carbonation of alkaline wastes is a promising method for capturing and utilizing carbon dioxide (CO2). Exploring the carbonation potential of relatively inert alkaline wastes is crucial for developing mineral carbonation. This study conducted a fundamental investigation on the circular indirect carbonation of coal fly ash and examined the stages of fly-ash leaching, calcium carbonate precipitation, and solution regeneration. By optimizing the liquor purification process, the CO2 conversion rate and uptake efficiency can be improved.

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A green and efficient strategy for utilizing of coal fly ash to synthesize K-MER zeolite as catalyst for cyanoethylation and adsorbent of CO2

Wenting Chen et al.

Summary: In this study, K-MER zeolites with great crystallinity and purity were successfully synthesized from coal fly ash using the method of microwave and ultrasound collaborative activation, leading to improved extraction efficiency of Si and Al. By adjusting experimental conditions, various morphologies of K-MER samples were prepared, with maximum CO2 adsorption volume achieved, and good catalytic performance in the reaction between methanol and acrylonitrile.

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Stabilization-solidification-utilization of MSWI fly ash coupling CO2 mineralization using a high-gravity rotating packed bed

Tse-Lun Chen et al.

Summary: This study aimed to develop an integrated wet-extraction and carbonation process for Municipal Solid Waste Incineration Fly Ash (MSWI-FA) using high-gravity technology for stabilization, solidification, and utilization. The experimental results showed that the carbonated product of MSWI-FA can be used as a supplementary cementitious material in cement mortar, potentially reducing the usage of Portland cement.

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Review Materials Science, Ceramics

High value-added applications of coal fly ash in the form of porous materials: A review

Chao Wang et al.

Summary: Coal fly ash, a solid waste generated by coal-fired power plants, poses an urgent disposal challenge. Preparation of porous materials is an effective way to achieve high added value applications, with ceramic membranes being identified as the most ideal material for this purpose.

CERAMICS INTERNATIONAL (2021)

Article Environmental Sciences

Utilization of low-calcium fly ash via direct aqueous carbonation with a low-energy input: Determination of carbonation reaction and evaluation of the potential for CO2 sequestration and utilization

Hsing-Jung Ho et al.

Summary: This study investigated the utilization of fly ash through direct aqueous carbonation to absorb CO2 and form carbonate. Despite using a low-energy input method, the CO2 uptake efficiency was comparable to previous studies, and the product was found to be safe for further utilization.

JOURNAL OF ENVIRONMENTAL MANAGEMENT (2021)

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Controls on CO2 Mineralization Using Natural and Industrial Alkaline Solids under Ambient Conditions

Erika Callagon La Plante et al.

Summary: The research explores the potential of using alkaline solids for carbon dioxide mineralization and found that the carbonation efficiency is positively correlated with the CaO and MgO content of the solids, and negatively correlated with the SiO2 content. The atomic topology of the solid reactant influences the rate-controlling step of carbonation process.

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Carbonation curing of cement mortars incorporating carbonated fly ash for performance improvement and CO2 sequestration

Tiefeng Chen et al.

Summary: The study shows that carbonation treatment reduces the content of free CaO in cement mortar, and the synergy of carbonation treatment and carbonation curing can compensate for strength loss caused by FA incorporation, but may delay strength development due to the pozzolanic effect. The CO2-3 introduced by carbonation treatment can affect the resistance of chloride ion penetration, and carbonation curing mitigates this impact by improving the pore structure.

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CO2 capture and mineralization using carbide slag doped fly ash

Rong Liu et al.

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CO2 adsorption capacity of zeolites synthesized from coal fly ashes

Thiago F. de Aquino et al.

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CO2 sequestration and simultaneous zeolite production by carbonation of coal fly ash: Impact on the trapping of toxic elements

Luis Monasterio-Guillot et al.

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Geopolymers produced with fly ash and rice husk ash applied to CO2 capture

Alisson Lopes Freire et al.

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Experimental study of CO2 capture enhanced by coal fly ash-synthesized NH2-MCM-41 coupled with high gravity technology

Shang-Yuan Cheng et al.

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Preparation of a morph-genetic CaO-based sorbent using paper fibre as a biotemplate for enhanced CO2 capture

Xiaotong Ma et al.

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Effects of fly ash properties on carbonation efficiency in CO2 mineralisation

Long Ji et al.

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Applications of fly ash for CO2 capture, utilization, and storage

Abdallah Dindi et al.

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CO2 sequestration by direct gas-solid carbonation of fly ash with steam addition

Wei Liu et al.

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Carbonation of high-calcium fly ashes and its potential for carbon dioxide removal in coal fired power plants

Agnieszka Cwik et al.

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Green synthesis of mesoporous gamma-Al2O3 from coal fly ash with simultaneous on-site utilization of CO2

Feng Yan et al.

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Green Synthesis of Nanosilica from Coal Fly Ash and Its Stabilizing Effect on CaO Sorbents for CO2 Capture

Feng Yan et al.

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CO2 sequestration by direct mineralisation using fly ash from Chinese Shenfu coal

Long Ji et al.

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Fly-Ash-Modified Calcium-Based Sorbents Tailored to CO2 Capture

Huichao Chen et al.

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Effects of steam on CO2 absorption ability of calcium-based sorbent modified by peanut husk ash

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B. Gonzalez et al.

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Self-sustaining carbon capture and mineralization via electrolytic carbonation of coal fly ash

Lu Lu et al.

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Direct mineral carbonation of coal fly ash for CO2 sequestration

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CO2 capture using fly ash from coal fired power plant and applications of CO2-captured fly ash as a mineral admixture for concrete

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A laboratory-scale study of the aqueous mineral carbonation of coal fly ash for CO2 sequestration

N. L. Ukwattage et al.

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Performance of Coal Fly Ash Stabilized, CaO-based Sorbents under Different Carbonation-Calcination Conditions

Feng Yan et al.

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A Novel Method for CO2 Sequestration via Indirect Carbonation of Coal Fly Ash

Lanlan He et al.

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Comparison of CO2 capture by ex-situ accelerated carbonation and in in-situ naturally weathered coal fly ash

Grace N. Muriithi et al.

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CO2 sequestration by indirect carbonation of high-calcium coal fly ash

Lanlan He et al.

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Sequestration of carbon dioxide by indirect mineralization using Victorian brown coal fly ash

Yong Sun et al.

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Carbon capture and storage using alkaline industrial wastes

Erin R. Bobicki et al.

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Heavy metal characterization of CFB-derived coal fly ash

Nikolaos Koukouzas et al.

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Muriithi Grace Nyambura et al.

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