Current State of Coal Fly Ash Utilization: Characterization and Application

Valeev, Dmitry

doi:10.3390/ma16010027

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…Since most metals (V, Ni, Co and Fe) are chemically bonded to the polyaromatic fragments of the asphaltenes, they are found in the fly ash rather than the bottom ash of the pulverized or fluidized petcoke furnaces. Metal-containing ash is a waste and substantial efforts are being invested into its utilization (see special issue [59] and review [60]). The most common applications for fly ash are composites [61], waste stabilization [62] and construction materials [63].…”

Section: Fly Ash From Heavy Fuel Oil and Coke Combustionmentioning

confidence: 99%

Vanadium and Nickel Recovery from the Products of Heavy Petroleum Feedstock Processing: A Review

Vishnyakov

2023

Metals

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The steadily growing demand for non-ferrous metals, a shift to heavier crude oil recovery and tightened environmental standards have increased the importance of heavy petroleum feedstock (HPF) as a raw source of metals. This paper reviews the recent developments in the recovery of vanadium and nickel from HPF. During crude oil processing and the application of its products, HPF is converted to various metal-enriched byproducts (“heavy oil”, petcoke, ashes and slags) from which the metals can be recovered. This paper briefly describes the sources and recovery pathways (both mainstream and exotic), and discusses the economic viability and possible future directions. Particular attention is paid to (i) the electrochemical recovery of metals from petrofluids and alternative approaches; (ii) pre-combustion metal recovery from petcoke; and (iii) metal reclamation from fly ash from heavy fuel oil or petroleum coke combustion: hydro- and pyro-metallurgical and bio-based techniques. The current stage of development and prospects for the future are evaluated for each method and summarized in the conclusion. Increasing research activity is mostly observed in traditional areas: metal extraction from fly ash and the reduction of metals from the ash to V–Fe and Ni–Fe alloys. Bioengineering approaches to recover vanadium from ashes are also actively developed and have the potential to become commercially viable in the future.

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Section: Fly Ash From Heavy Fuel Oil and Coke Combustionmentioning

confidence: 99%

Vanadium and Nickel Recovery from the Products of Heavy Petroleum Feedstock Processing: A Review

Vishnyakov

2023

Metals

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“…The large volume of waste generated nowadays constitutes a serious problem both for the environment and for populations living near their storage areas [1][2][3][4]. Another problem associated with obtaining construction materials, mainly concrete based on Portland cement, is the exploitation of non-renewable raw materials, namely, limestone and clay, which also involves high energy consumption [5,6].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Geopolymer Structural Insulation Panels Obtained with the Addition of Power Plant Ash and Furnace Slag with Potential Uses in the Fabrication of Specialized Structures

Ciobanu,

Schreiner,

Caramitu

et al. 2024

Sustainability

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The paper describes the process of obtaining geopolymer composites using raw materials from critical waste, i.e., mixed power plant ash and furnace slag powder. Using such geopolymer composites, structural insulation panels were made in the laboratory, which were subjected to tests specific to construction applications. At the same time, some special properties, such as sound insulation and electromagnetic shielding properties for special applications, were tested. The results obtained from the functional tests led to the conclusion that the panels made of geopolymer composites provided both sound and electromagnetic attenuation values clearly superior to those obtained from autoclaved cellular concrete, brick, or concrete structures, which encourages us to suggest such material concepts for complex shielding purposes. The sustainability of the technology for producing such geopolymer composites was fully demonstrated from the economic, environmental, and social perspectives.

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“…The increasing accumulation of fly ash has engendered significant land occupation and caused environmental pollution. It is an attractive way to refine fly ash from a wide range of low-priced sources into a valuable resource through specialized processing (Mathapati et al, 2021;Ma et al, 2022;Valeev et al, 2022;Das et al, 2023). Fly ash contains many valuable elements such as silicon, aluminium, iron, carbon, gallium, and germanium.…”

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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Current State of Coal Fly Ash Utilization: Characterization and Application

Abstract: This Special Issue of Materials is devoted to various aspects of coal fly ash (CFA) utilization [...]

Cited by 5 publications

References 12 publications

Vanadium and Nickel Recovery from the Products of Heavy Petroleum Feedstock Processing: A Review

Vanadium and Nickel Recovery from the Products of Heavy Petroleum Feedstock Processing: A Review

Sustainable Geopolymer Structural Insulation Panels Obtained with the Addition of Power Plant Ash and Furnace Slag with Potential Uses in the Fabrication of Specialized Structures

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

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