Characteristics of Coal Gangue and Present Situation and …
As an associated mineral of coal, coal gangue is a mixture of carbonaceous shale, argillaceous shale and sandy shale, the main components of coal gangue are SiO 2 and Al 2 O 3 (Ying and Zhenhua 2011; Wenqing 2021), it also contains about 30 micronutrients, including calcium, iron, zinc, selenium, sulphur, phosphorus and potassium, It contains ...
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Influence of biomass on multi-component reaction model …
The effects of biomass on coal gangue combustion characteristics, combustion products and combustion reaction model are studied in this paper.
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Preheating pyrolysis-char combustion characteristics and …
In view of the analysis of coal gangue pyrolysis products, Liu [14] et al. analyzed the pyrolysis products of coal gangue at different pyrolysis temperatures, and concluded that the main components of pyrolysis gas are CO, H 2, NH 3 and other substances, and it is believed that the pyrolysis of coal gangue can be precisely controlled by ...
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Novel Methods for Separation of Gangue from Limestone …
Ore sorting is a useful tool to remove gangue material from the ore and increase the quality of the ore. The vast developments in the area of artificial intelligence allow fast processing of full-color digital images for the preferred investigations. The associated gangue minerals from limestone and coal mines were identified using three different approaches. All …
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Gangue Characterisation
This chapter discusses the methodology for characterisation and identification of the minerals defined and selected in Chap. 133 as common gangue minerals. As shown in the compilation presented (Table 134.1), the very low reflectance of most gangue minerals (either measured or reckoned by the Fresnel equation) distinguishes them clearly from the metallic ores.
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Explanation of heavy metal pollution in coal mines of china …
The chemical components of coal seams and coal gangue in different mining areas and different geological ages are quite different. In order to realize the harmlessness, resource treatment, and utilization of coal gangue in China, it is necessary to conduct in-depth research on the geochemical characteristics of pollution components such as ...
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Opportunities, challenges and modification methods of coal gangue …
Coal gangue is a complex industrial solid waste mixed with organic compounds, inorganic compounds and minerals (Fabiańska et al. 2013).Its major chemical compositions are SiO 2, Al 2 O 3 and Fe 2 O 3, with traces of CaO, P 2 O 5, MgO and MnO 2.The chemical composition of coal gangue from various sources and its comparison with soil reference …
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Study on the Pore and Microstructure Fractal Characteristics of …
The main chemical components of coal gangue are SiO 2 and Al 2 O 3, and the activity of raw coal gangue is very deficient; it shows pozzolanic activity after calcination at 700 °C, which has similar chemical characteristics with fly ash and metakaolin. Slag belongs to the material of high calcium pozzolanic material, while coal gangue belongs ...
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Extraction of valuable components from coal gangue …
DOI: 10.1016/j.jiec.2022.06.033 Corpus ID: 250061599; Extraction of valuable components from coal gangue through thermal activation and HNO3 leaching @article{Shao2022ExtractionOV, title={Extraction of valuable components from coal gangue through thermal activation and HNO3 leaching}, author={Shuang Shao and Bao-zhong Ma and Cheng Yan Wang and Yongqiang …
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A review of intelligent coal gangue separation …
Numerous studies have found that the main components of coal gangue are Al 2 O 3 and SiO 2, and they contain various amounts of Fe 2 O 3, Cao, MgO, Na 2 O, K 2 O, P 2 O 5, SO 3, and trace rare elements (gallium, …
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16 Energy and Mineral Resources – An Introduction to Geology
KEY CONCEPTS. Describe how a renewable resource is different from a nonrenewable resource. Compare the pros and cons of extracting and using fossil fuels and conventional and …
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Microstructure of Coal Gangue and Precipitation of Heavy …
In recent years, domestic and foreign scholars have conducted a series of useful fundamental research on the microstructure of coal gangue, its mineral components, and …
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Common Gangue Minerals
The most common gangue minerals have been selected in Table 133.1, identifying them with the same symbols (abbreviations) as in Annex 1.3 (Gangue). As Table 133.1 shows, most of the gangue species are classified in only two of the Berzelius classes, namely (in approximate order of decreasing abundance and noting the main families within the classes): ...
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Separation and Recovery of Valuable Carbon Components …
1. Introduction. Coal is one of the main energy sources in many countries, and coal gangue (CG) is a kind of gray-black rock produced in the process of coal processing and washing, with low carbon content and harder than coal, generally accounting for 15%–20% of coal production in China and 25% of industrial waste emissions. 1−3 In recent years, with the …
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Removal of gangue components from low-grade iron ore …
In the present the study, the hydrothermal removal of gangue components (Si, Al, and P) from iron ore as a means of producing high-grade iron ore from low-grade iron ore (limonite) is investigated.
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Main components of the coal gangue. | Download …
... seen from Figure 2, the coal gangue is a multiphase mixture [29], and the main phases in the coal gangue are kaolinite, quartz, brookite, montmorillonite, pyrite, and siderite [30], in...
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Research on the Identification Mechanism of Coal Gangue …
For coal and gangue, intelligent sorting processes for separation, the use of coal and gangue mineral components with different fundamental differences, and the study of different properties of ...
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Environmental hazards and comprehensive utilization of …
Coal gangue pollution components can be released into the soil surface water not only by direct weathering of the coal gangue, but also through the process of "coal-water" interaction, where pollutants are released into the external environment as leachate [29]. Consequently, these pollutants can reach the surrounding land and groundwater.
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Study on the calorific value and cementitious properties of coal gangue
The main mineral components of the coal gangue shown in Fig. 3 are quartz, kaolinite, and muscovite, etc. Kaolinite is a 1:1 clay mineral composed of silica tetrahedral sheets and alumina octahedral sheets [35], which is the main component of coal gangue. Dehydration of kaolinite and formation of metakaolinite are the main reactions in the ...
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Using Chinese Coal Gangue as an Ecological Aggregate and …
Coal gangue is a kind of industrial solid waste with serious ecological and environmental implications. Producing concrete with coal gangue aggregate is one of the green sustainable development requirements. This paper reviews the properties and preparation methods of Chinese gangue aggregate, studies the influence of gangue aggregate on …
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Research on the impact and control techniques of gangue …
The function of each component in the new blocking gangue support structure is shown in Table 5. Table 5. Function of different components in N-BGSS. Components Functions; Sliding yield I-steel: The overlap of I-steel enhances the overall bending resistance and reduces the transient impact deformation during gangue impacts. The relative slip of ...
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Research Progress on Comprehensive Utilization of Coal Gangue
Coal gangue is one of the largest mine solid wastes in China, and its discharge and stockpiling have caused resource waste, environmental pollution and other problems. Starting from the resource characteristics of coal gangue, this paper systematically discusses the ways and research status of coal gangue resource utilization, mainly including: extracting and …
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Characteristics of Coal Gangue and Present Situation and …
As an associated mineral of coal, coal gangue is a mixture of carbonaceous shale, argillaceous shale and sandy shale, the main components of coal gangue are SiO 2 and Al 2 O 3 (Ying and Zhenhua 2011; Wenqing 2021), it also contains about 30 micronutrients, including …
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Spontaneous combustion coal gangue-based composite …
Coal gangue is a byproduct of coal mining, constituting approximately 15% of the total raw coal output [1].Over the past few decades, coal has become the primary energy source in China, resulting in the accumulation of 5 billion tons of coal gangue, with an additional 300 to 350 million tons generated annually [1].Spontaneous combustion coal gangue is a widely …
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Recognition method of coal and gangue combined with …
Accurate identification of coal and gangue is an important prerequisite for intelligent separation, which can help the intelligent development of coal mines. Based on multispectral imaging, we propose a coal and gangue identification method combining structural similarity index measure (SSIM) and principal component analysis network (PCANet).
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Effects of reducing environment and fusible components on …
Coal gangue (CG) produced in coal mining and washing is one of the largest industrial solid wastes in China [1]. The average production of CG is approximately 10%–15% of the raw coal production in China [2]. ... They are fusible components and generally participate in the formation of eutectic compounds at a high temperature, leading to the ...
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Enhancing the carbon content of coal gangue for …
However, it is crucial to note that heavy metals and naturally occurring polycyclic aromatic hydrocarbons (PAHs) present in coal gangue are considered significant pollutants among its various components (Ahrens and Morrisey, 2005). Coal gangue ash contains small amounts of harmful trace elements, such as As and Cr.
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Influence of lignin on coal gangue pyrolysis and gas …
The influence mechanism of lignin on coal gangue pyrolysis has not been studied in the literature, so this article is helpful to clarify the influence mechanism of biomass components on coal gangue. The research of coal gangue pyrolysis technology has a positive effect on reducing the amount of solid waste and reducing the harm to the environment.
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Effects of gangue compositions on reduction process of …
The influence of gangue compositions (mainly composed of SiO2, CaO, MgO and Al2O3) on the reduction kinetics of carbon-bearing iron ore pellets was estimated at 1373–1473 K in N2 atmosphere. The results showed that gangue content and each component distribution affected the pellets reduction process. The reduction rate was found to follow a linear …
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Complementary advantages of spent pot lining and coal gangue …
For extracting valuable components, Spent pot-lining and coal gangue were co-treated by hydrothermal acid-leaching method in this study. Effect of adding spent pot-lining on impurities leaching ...
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