VAT preferential policies for coal gangue fly ash utilization
Reutilisation of coal gangue and fly ash as underground …
DOI: 10.1016/j.jclepro.2020.120113 Corpus ID: 213415175; Reutilisation of coal gangue and fly ash as underground backfill materials for surface subsidence control @article{Li2020ReutilisationOC, title={Reutilisation of coal gangue and fly ash as underground backfill materials for surface subsidence control}, author={Meng Li and …
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Properties of Coal Gangue-Fly Ash Backfill Slurry
Processes 2020, 8, 284 2 of 11 This approach can e ectively control mining subsidence and improve the resource recovery rate while more fully utilizing the coal gangue and fly ash resources [11 ...
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Current State of Coal Fly Ash Utilization: Characterization …
Introduction and Scope. This Special Issue of Materials is devoted to various aspects of coal fly ash (CFA) utilization. The Guest Editors of the issue were Dr. Alex …
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Comprehensive utilization and environmental risks of coal gangue: A
The amount of coal gangue, a by-product of coal mining and washing, is rapidly increasing with the growing trend of energy consumption. The accumulated coal gangue without appropriate utilization has resulted in a squander of resources, waste disposal and environmental pollution issues. Over the past few decades, there has been …
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Exploring a promising technology for the extraction of …
ABSTRACT The coal fly ash (CFA) in the present study contains a high content of gallium, which is categorized as a strategic metal. Gallium extraction from CFA is an important step toward its reutilization. Two different processes for gallium extraction were systematically investigated and compared. The effects of mixed acid, microwave power, …
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Effect and mechanism of coal gangue concrete modification by fly ash
1. Introduction. Coal gangue is a type of solid waste produced in the coal mining and washing processes. The global coal mining industry produces approximately 350 million tons of inactive gangue each year, and the accumulated coal gangue in China alone amounts to 6.0 billion tons [1], [2], [3].In Spain, about 2 million tons of coal mine …
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Effects of Kaolin Addition on Mechanical Properties for Cemented Coal
In this investigation, six groups of cemented coal gangue-fly ash backfill (CGFB) samples with varying amounts of kaolin (0, 10, 20, 30, 40, and 50%) instead of cement are prepared, and their mechanical properties are analyzed using uniaxial compression, acoustic emission, scanning electron microscopy, X-ray diffraction, and …
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Migration transformation, prevention, and control of typical …
Coal gangue is one of China's main industrial solid wastes, which contains various harmful heavy metal elements, such as lead (Pb). The long-term accumulation of coal gangue causes Pb to migrate to the surrounding environment due to weathering and rain erosion, eventually endangering human life and health with its continuous …
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7NEE6J8685
The national policy of using coal as the basic fuel for electric power production will not change in a long time [1]. After burning, 1t raw coal can produce 250~300kg fly ash.
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Character of the Si and Al Phases in Coal Gangue and Its Ash
The kaolinit at about 984°C releases a large quantity of SiO 2, which makes calcine coal gangue more active than coal gangue itself. The relationship between the ratio Al 2 O 3 (mole) /SiO 2 (mole) and the components of coal gangue ash is analyzed, resulting in a formula to calculate the quantity of each phase. Applying the formula to the ...
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Preparation of coal gangue-slag-fly ash geopolymer …
DOI: 10.1016/j.conbuildmat.2022.126997 Corpus ID: 247333723; Preparation of coal gangue-slag-fly ash geopolymer grouting materials @article{Guo2022PreparationOC, title={Preparation of coal gangue-slag-fly ash geopolymer grouting materials}, author={Lingzhi Guo and Mei Zhou and Xinyi Wang and Chao-jin Li and Han-Wei Jia}, …
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Effect of the co-activation of sodium silicate and CO
Static segregation of coal gangue-fly ash backfill (CGFB) material presents a significant impact on its mechanical performance for underground support. To resolve, a novel formulation was addressed using sodium silicate (SS) and CO2 as co-activator. Its setting behaviors and mechanical properties were investigated with respect to the coal …
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Enhancing Coal Gangue Aggregates with Fly Ash-Cement …
The application of coal gangue in construction materials faces challenges due to its inherent structural looseness, elevated porosity, and high carbon content. This study encapsulated coal gangue aggregates (CGAs) with a fly ash-cement slurry, varying the content of fly ash (0%, 10%, 20%, and 30%) and maintaining a water-to-cement …
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Using Chinese Coal Gangue as an Ecological Aggregate and …
When fly ash content is 0%, the interface transition zone will produce cracks extending into the aggregate due to the influence of coal gangue aggregate. When fly ash content is 30%, coal gangue concrete crack extension is interrupted by fly ash particles; with only porosity and small cracks, the bond stress of the interface transition zone is ...
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A Review of Coal Fly Ash Utilization to Save the Environment
The objective of this review paper is the eco-friendly utilization of fly ash powder to solve various environmental problems and to diminish disposal issues. This …
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Exploring calcined coal gangue fines as the total substitute of fly ash …
1. Introduction. Coal gangue, a waste produced during coal mining, has been regarded as the largest source of industrial waste in China. It is estimated that the production of 1 t coal generates 0.1–0.25 t coal gangue [1], and the total stockpile of coal gangue exceeds 6 billion tons in China [2], [3].The coal gangue not only occupies …
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Environmental hazards and comprehensive utilization of solid waste coal
The calorific value of coal gangue refers to the amount of energy that can be released from complete combustion of coal gangue per unit mass under certain conditions, and it usually increases with increasing carbon mass fraction and volatile fraction and decreases with increasing ash fraction [24].The meltability of coal gangue refers to the …
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Coal fly ash utilization in agriculture: its potential benefits and
Over the past few decades there has been avid interest in developing the strategies for the utilization of Fly ash (FA). Major foci have been on its agricultural application. It is often economical to use FA as a soil amendment. The potential of FA as a resource material in agriculture is due to its specific physical properties like's texture, …
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The influence of fly ash content on ITZ microstructure of coal gangue …
DOI: 10.1016/J.CONBUILDMAT.2021.123562 Corpus ID: 238687051; The influence of fly ash content on ITZ microstructure of coal gangue concrete @article{Qiu2021TheIO, title={The influence of fly ash content on ITZ microstructure of coal gangue concrete}, author={Jishen Qiu and Yunxian Zhou and Xiao Guan and …
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Properties and Hydration Mechanism of Autoclaved …
Fly ash (FA) refers to the dust and furnace bottom slag collected from the flue gas of coal-fired (CG, slime) boilers. China is one of the few countries in the world using the coal as its main energy source. In the past decade, with China's power industry developing rapidly, the total number of coal-fired generating units has continued to expand,
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Value-added utilization of coal fly ash in polymeric …
DOI: 10.1016/j.jmrt.2023.02.026 Corpus ID: 256804195; Value-added utilization of coal fly ash in polymeric composite decking boards @article{Wang2023ValueaddedUO, title={Value-added utilization of coal fly ash in polymeric composite decking boards}, author={Guxia Wang and Zhaoshuai Li and Jun Yan and Yongqiang Qian and Yen Wei …
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Synthesis and characterization of geopolymers derived from coal gangue …
DOI: 10.1016/J.CONBUILDMAT.2019.02.076 Corpus ID: 140098289; Synthesis and characterization of geopolymers derived from coal gangue, fly ash and red mud @article{Koshy2019SynthesisAC, title={Synthesis and characterization of geopolymers derived from coal gangue, fly ash and red mud}, author={Nevin Koshy and Kunga …
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Energies | Free Full-Text | Investigation of …
Backfilling is widely used to control surface subsidence and stope stability to improve pillar recovery. Furthermore, it is also an effective way to process and dispose of mining waste such as coal gangue and …
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Sustainable and clean utilization of coal gangue: activation …
Coal gangue, a by-product produced during the coal processing, has a serious impact on the environment. Using coal gangue as a fertilizer has been proven helpful in potentially reducing its environmental impact and improving its value. In this study, the formation mechanism and influencing factors of coal-gangue-based silicon fertilizer was studied …
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Application of Fly Ash and Coal Gangue for Preparing High …
Abstract: The fly ash and coal gangue were used as main raw materials to roast solid insulating brick.Lower than solid clay brick (300 °C) which belongs to low temperature roasting, roasting time cycle is 24 h,the ratio of fly ash and coal gangue is 60% :35%. the B7 admixing expanded pearlite compressive strength is 30.25 MPa . …
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Fly Ash Management and Utilization Mission
Dated 09-03-2022 regarding Constitution of Fly Ash Management and Utilization Mission for scientific management and utilization of fly ash as per Hon'ble NGT's Order dated 18-01-2022; Dated 28-08-2019 on Guidelines for disposal or utilisation of Fly Ash for reclamation of low lying areas and in stowing of abandoned mines
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Effect of the co-activation of sodium silicate and CO2 on …
This study aims to investigate the weakening of CO2-fly ash-based backfill (CFBF) material in cation water. Weakening is determined in an order of Na+ > Ca2+ > Mg2+ by slake durability and ...
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Fly Ash Management and Utilisation Mission
Fly Ash. About: Fly ash is an unwanted unburnt residue of coal combustion in a coal thermal power plant.; It is emitted along with flue gases during the burning of coal in a furnace and collected using the electrostatic precipitators.; The fly ash collected with the help of precipitators is converted into a wet slurry to minimise fugitive dust …
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Recovery of rare-earth elements from coal fly ash via
Fly ash USA Reacting with 6.25 mol/L NaOH at 85℃, followed by acid leaching with 20% HCl REY recoveries of up to 85% were obtained [364] Fly ash USA Reacting with 5 mol/L NaOH at 100℃ REY was ...
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Technology for Chemical−Metallurgical Coal Ash Utilization …
Coal fly ash is a promising alternative source for rare earth elements (REE), which are critical materials in many technologies. REEs are entrained in the aluminosilicate glass of the fly ash ...
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