Coal gangue composition
Preparation and characterization of coal gangue geopolymers
Main chemical components of calcined coal gangue was analyzed by X-ray fluorescence spectroscopy (XRF), as shown in Table 1.The mineral components of original coal gangue and coal gangue calcined at 700 °C by X-ray diffraction (XRD) and demonstrated the results in Fig. 2.The main mineral components of coal gangue …
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Synergistic performance of microwave-activated coal gangue …
The uniaxial compressive strength, phase composition, microstructure, and pore structure of the MCG-based LC 3 cements were analyzed. The results indicate that the maximum volcanic ash activity index is achieved when the material is microwave-activated at 800°C with a holding time of 20 minutes. ... Coal gangue: The coal gangue (CG) …
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Processes | Free Full-Text | Activation of Low-Quality Coal …
The chemical composition of coal gangue was analyzed through X-ray fluorescence (XRF) spectrometry (S4 PIONEER, Bruker, Mannheim, Germany) at a …
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Thermal Activation of High-Alumina Coal Gangue Auxiliary …
In this paper, a new preparation technology is developed to make high-alumina coal gangue (HACG) auxiliary cementitious admixture by calcining HACG–Ca(OH)2 (CH) mixture. HACG powders mixed with 20 wt.% CH were calcined within a temperature range of 600–900 °C, and the thermal transformation and mineral phase …
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Study on the macro–micro evolution of compaction
Tests on the basic properties of gangue materials. As shown in Fig. 2, the composition of gangue was analysed by RXD spectroscopy in this experiment.The …
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Representative coal gangue in China: Physical and chemical …
In addition to quartz, the diffraction peaks of Al 2 SiO 5, CaSO 4 and Fe 2 O 3 also exist in CG, so the main mineral composition of coal gangue also includes kaolinite and pyrite. The large amount of anorthite is also one of the reasons why coal gangue is …
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Comprehensive utilization and environmental risks of coal …
In addition, the composition of coal gangue is closely associated with coal mining process. At present, the comprehensive utilization of coal gangue is mainly …
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Changes in Minerial Composition and Structure of Coal Gangue …
The changes in composition and structure of coal gangue during heat and mechanical activation were investigated by means of XRD, IR and nuclear magnetic resonance (NMR). The results show that during calcining process of coal gangue, coal in the coal gangue burned, kaolinite gradually transformed into metakaolin when calcining temperature …
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Microstructure of Coal Gangue and Precipitation of Heavy …
In the composition of coal gangue, SiO 2 is the main component, followed by Al 2 O 3. The content of SiO 2, Al 2 O 3, and S in the weathered coal gangue was …
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Characteristics of Coal Gangue and Present Situation and …
The rock composition of coal gangue is related to the geological condition of the coal field and the mining technology. The composition of the rocks varies widely and is complex, mainly composed of shale (carbonaceous shale, argillaceous shale, silty shale), mudstone (mudstone, carbonaceous mudstone, silty mudstone), it is composed of …
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Characterization studies on coal gangue for sustainable …
The chemical composition of coal gangue is almost close to natural soils except for alumina phase. These phases can be of immense importance when the …
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(PDF) Recycling of Moroccan coal gangue in the elaboration …
Limestone-gangue mixture that comes closest to the reference one considered in our study contains 18.5% of coal gangue. The oxide composition for this mixture: C = 63.2, S = 21.0, A = 7.97, F = 2.06, which are close to the values used in the manufacture of cement. It is therefore possible to recycle and valorize coal gangue in the development ...
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Thermal behavior and chemical reactivity of coal gangue …
1. Introduction. Coal gangue is an undesired but inevitable by-product emitted during coal mining and processing, accounting for approximately 10 %–15 % of the raw coal output [1].In 2020, China's coal gangue output exceeded 400 million tons [2].Currently, the accumulated coal-gangue stockpile in China is 6 billion tons [3].Coal …
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Microstructure of Coal Gangue and Precipitation of Heavy
In this study, the microstructure, mineral composition, and precipitation of heavy metal elements of coal gangue with different weathering degrees were analyzed through electron microscopy, X-ray ...
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Characterization of coal gangue and coal gangue …
The composition and structure of the coal gangue and the as-prepared sodalite were characterized by XRD, TG-DTG, FTIR, XPS, N 2 adsorption–desorption technique, laser particle analyzer, SEM–EDS, …
ادامه مطلبInfluence of coal gangue mulching with various thicknesses …
Coal gangue occupies large swathes of land resources, resulting in ecological fragility and various environmental problems. ... influence the microbial community composition and function 17,18 ...
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Thermal decomposition of selected coal gangue
The thermal behavior of two mineral-type coal gangues under different temperature conditions was investigated by heating treatment of kaolinite-type coal gangue and illite-type coal gangue based on thermal analysis, X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM). Thermogravimetric, …
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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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Chen et al.
The composition of coal gangue is more complex, and its main minerals include clay minerals, carbonate minerals, bauxite, pyrite, quartz, mica, feldspar, carbonaceous and …
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Transformation behavior of mineral composition and trace …
DOI: 10.1016/J.FUEL.2012.02.027 Corpus ID: 93714613; Transformation behavior of mineral composition and trace elements during coal gangue combustion @article{Zhou2012TransformationBO, title={Transformation behavior of mineral composition and trace elements during coal gangue combustion}, author={Chuncai …
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Study on the Occurrence of Gallium in Gallium-Enriched Coal Gangue …
The coal gangue used in this study was obtained from Shuozhou, Shanxi province, China. The chemical composition of the raw coal gangue as well as the residue ash were quantified by an inductively coupled plasma optical emission spectrometer (ICP-OES, Pekin-Elmer, Optima 5300DV) and X-ray fluorescence spectrometry (XRF, …
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Low-carbon utilization of coal gangue under the carbon …
Coal gangue, produced during coal mining and processing [1, 2], is one of the most extensively produced solid wastes in China [1, 3], accounting for approximately 10%‒20% of raw coal production [].The accumulation of coal gangue causes serious environmental, social, and economic problems in the coal mining area [].Heavy metals …
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Study on the leaching behavior differences of rare earth …
The chemical composition of coal gangue is listed in Table 2, and its main components are 47.32 % SiO 2, 22.99 % Al 2 O 3, and 28.20 % Loss on ignition (LOI). Additionally, other components such as TiO 2, SO 3, Fe 2 O 3, K 2 O, and CaO are also detected.
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Determination of heavy metals concentrations in coal and coal gangue …
During mining, processing and utilization of coal, the environment is exposed to piles of coal, coal gangue and coal ash, which have human health concerns. Coal and coal gangue samples were obtained from a coal mining company located in Southern Province, Sinazongwe District, Zambia. The main objective of this research was to …
ادامه مطلبSustainable and clean utilization of coal gangue: …
Coal gangue, a by-product produced during the coal processing, has a serious impact on the environment. Using coal gangue ... cal composition of corn stalk ash at dierent calcination temperatures were characterized using X-ray uorescence spectrometry (XRF) (Bruker S8 Tiger, Bruker AXS, Ger-
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Effect of Coal Gangue Grading Characteristics on cemented …
The aggregate is composed of coal gangue sourced from Daizhuang Coal Mine, Shandong, China. Coal gangue is typically employed as a filling aggregate in coal mines, with a maximum particle size of 25 mm (1 in), frequently requiring preliminary crushing and screening via jaw crusher [14].The CPB for coal mines belongs to the …
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Environmental hazards and comprehensive utilization of solid waste coal
The coal gangue activity primarily arises from the conversion of well-crystallized kaolinite into disordered metakaolin [117, 118]. Through the utilization of microwave activation, Guan modified the mineral composition of coal gangue powder, effectively isolating the active compounds and enhancing the roundness and fineness of …
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The Sustainable Utilization of Coal Gangue in Geotechnical …
Abstract Among coal mining-related wastes, coal gangue (CG) is the heterogeneous waste generated during the mineral processing or coal washing phase of coal mining. A thorough understanding of environmental concerns associated with the current model of ...
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[PDF] Rapid Analysis of Composition of Coal Gangue Based …
Coal gangue is the main solid waste in coal mining areas, and its annual emissions account for about 10% of coal production. The composition information of coal gangue is the basis of reasonable utilization of coal gangue, and according to the composition information of coal gangue, one can choose the appropriate application …
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Preparation of coal gangue ceramsite high-strength …
Coal gangue (CG) is a type of industrial solid waste produced by the process of coal excavation and separation 1,2,3. Generally, one ton of CG is discarded for every 10 tons of produced coal 4, 5 .
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