Pretreatment method for the utilization of the coal ash landfilled in ash ponds

Um, Namil; Jeon, Tae-Wan

doi:10.1016/j.psep.2021.07.013

Cited by 17 publications

(3 citation statements)

References 38 publications

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“…Finally, the investigators found magnesioferrite in the CFA, which had high reflectivity and formed octahedra 10 µ in size in the microsphere core, whose spaces were filled with calcium ferrite (Sokol et al, 2002). Rough-surfaced ferrospheres have depositions of ferrous particles on their surfaces and are comparatively more magnetic than the smooth-surfaced ferrospheres (Sokol et al, 2002;Um and Jeon, 2021). Rough-surfaced ferrospheres have several ferrous-rich granular depositions on their surface, while smooth-surfaced ferrospheres have a homogenous spread of molten ferrous on their surfaces, which is responsible for their weakly magnetic nature (Fomenko et al, 2021).…”

Section: Ferrosphere Properties and Typesmentioning

confidence: 99%

Emerging trends in the recovery of ferrospheres and plerospheres from coal fly ash waste and their emerging applications in environmental cleanup

Yadav

Modi²,

Alyami

et al. 2023

Front. Earth Sci.

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Coal fly ash (CFA) is a major global problem due to its production in huge volumes. Fly ash has numerous toxic heavy metals; thus, it is considered a hazardous material. However, it also has several value-added minerals like ferrous, alumina, and silica along with other minerals. Fly ash also has several natural micro- to nano-structured materials; for instance, spherical ferrous-rich particles, cenospheres, plerospheres, carbon nanomaterials, and unburned soot. These micron- to nano-sized particles are formed from the molten slag of coal, followed by condensation. Among these particles, plerospheres which are hollow spherical particles, and ferrospheres which are ferrous-rich particles, have potential applications in the environmental cleanup, research, catalytic industries, and glass and ceramics industries. Additionally, these particles could be further surface-functionalized or purified for other applications. Moreover, these particles are widely explored for their potential in the army and other defense systems like lightweight materials and sensing The recovery of such particles from waste fly ash will make the process and remediation technology economically and environmentally friendly. The current review focuses on the various structural and elemental properties of ferrospheres and plerospheres from fly ash. This review also focuses on the emerging applications of both naturally formed materials in CFA.

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Section: Ferrosphere Properties and Typesmentioning

confidence: 99%

Emerging trends in the recovery of ferrospheres and plerospheres from coal fly ash waste and their emerging applications in environmental cleanup

Yadav

Modi²,

Alyami

et al. 2023

Front. Earth Sci.

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“…The chemical composition of CFA resulting from hard coal combustion comprises mostly silicon, aluminum, iron in the form of oxides and quartz, mullite, hematite and magnetite are the most frequently occurring crystalline phase [8,9,[14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Structural, Morphological and Physical Characterization of Carbon Fly Ash

Parra¹,

Carvajal

Cuaspud

2023

Orbital: Electron. J. Chem.

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Carbon fly ash (CFA) is the principal industrial waste byproduct from the burning fossil fuel (coal combustion) for the thermal generation of electricity. CFA is a gray or black powdery solid that is constituted mostly metal oxides (Al, Si Fe and Ca), unburned carbon (UC) and other inorganic substance. The management of fly ash has thus been a matter of concern given the requirement of the large area of land for its disposal and potential of causing pollution of air, water, land and effects on human health. Physical and chemical characteristics of fly ash is important, as these characteristics influence its subsequent use and disposal. X-ray diffraction, and fluorescence, scanning microscopy with an energy dispersive spectroscopy, FTIR, BET was the common techniques employed to characterize FA. Characterization by XRD analysis identified the presence of quartz, mullite and sillimanite phases; while the FTIR results allowed the identification of vibrational bands, characteristic of Si-O-Si and Si-O bonds. The EDS analysis coupled to SEM allowed verifying that the composition of the samples is consistent with the results sought and that the morphological characteristics validate the proposed methodology. Surface area analyses (BET) showed that the fly ash possess an active area of 6.02 m2 · g-1.

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“…Applying fly ash in agriculture mainly improves the clay and acid soil by improving the soil's physical and chemical properties. Fly ash has a specific adsorption capacity and can be used as an adsorbent or catalyst in environmental engineering to treat wastewater and waste gas (Dindi et al, 2019;Um et al, 2021;Majid., 2021;Nguyen et al, 2023;Rusănescu et al, 2023). However, low content of active components, high thermal stability, and poor formability limit the application and effectiveness of fly ash.…”

Section: Introductionmentioning

confidence: 99%

Semi-quantitative analysis study of the impact of microwave treatment on fly ash

Ma,

Nie,

Guo

et al. 2023

Physicochem. Probl. Miner. Process.

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Pre-processing provides an effective way for fly ash's high value-added utilization. However, the shortcomings of pre-processing methods such as grinding and flotation are apparent, with many disadvantages that make it more challenging to use efficiently. Microwave heating helps the SiO2-Al2O3 bond break, not only can make the structural change of the material can also promote the chemical reaction process. In the article, XRD, SEM, FT-TR, ammonia nitrogen adsorption, and other methods were used to analyze the changes in the properties of fly ash before and after microwave pre-treatment, the change of adsorption performance of fly ash before and after microwave treatment was analyzed. The study found that under microwave conditions of 600W and 15min, the adsorption rate of ammonia nitrogen by fly ash reached the maximum of 29.67%. The intensity of mullite and amorphous diffraction peaks decreased after 20 minutes at 600W. The Si-O-(Si, Al) and Si-O-(Si) bonds showed significant changes at 15 and 20 minutes under 600W conditions. Based on the results, microwave conditions were selected at 600W for different periods, and semi-quantitative analysis was carried out by XRD-Rietveld, infrared peak fitting, and nuclear magnetic resonance. The XRD-Rietveld analysis showed that the amorphous phase content reached 46.18% at 15 minutes. In the infrared peak fitting, the fitting area at 1300-900cm-1 and 600-400cm-1 peaks reaches 56.92% at 25 minutes and 17.5% at 15 minutes, respectively. The silicon-oxygen network's degree of connection and polymerization is reduced after 15 minutes of microwave treatment for the nuclear magnetic resonance analysis.

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Pretreatment method for the utilization of the coal ash landfilled in ash ponds

Cited by 17 publications

References 38 publications

Emerging trends in the recovery of ferrospheres and plerospheres from coal fly ash waste and their emerging applications in environmental cleanup

Emerging trends in the recovery of ferrospheres and plerospheres from coal fly ash waste and their emerging applications in environmental cleanup

Structural, Morphological and Physical Characterization of Carbon Fly Ash

Semi-quantitative analysis study of the impact of microwave treatment on fly ash

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