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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A short review of the sustainable utilization of coal gangue …

Chemically, coal gangue is a mixture of organic and inorganic substances. The major components of gangue are SiO 2 and Al 2 O 3, comprising approximately 60–90%. Coal gangue additionally encompasses a variety of trace elements such as Fe, Ca, Mg, Mn, Cu, Zn, Cl, P, and S along with their respective oxides.

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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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Research on the impact and control techniques of gangue …

Thus, a model for calculating the gangue impact energy including four modes of motion is developed, and the effect of different factors on the gangue impact strength is investigated. The maximum gangue impact velocity and impact energy are obtained. Different support components and parameters are designed and optimized by numerical simulation.

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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 …

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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...

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The effect of biomass addition on pyrolysis characteristics and …

The pyrolysis experiment of biomass added to coal gangue was studied by thermogravimetric-Fourier transform infrared spectroscopy-mass spectrometry (TG-FTIR-MS) method.

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Extraction of valuable components from coal gangue …

Coal gangue has the dual attributes of hazard and resource. With the increasing awareness of resources conservation and ecological sustainability, the high-value utilization of coal gangue has attracted active attention. In this research, thermal activation followed by HNO 3 leaching were performed to extract valuable components from coal ...

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Extraction of valuable components from coal gangue …

Coal gangue mainly contains SiO 2 and Al 2 O 3 ; they account for approximately 50-80% of the coal gangue component [43], making it an appropriate raw material for the synthesis of ZSM-5 molecular ...

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Effects of modified coal gangue addition on CO2 release …

The coal gangue utilized in this study was obtained from the Qingdong coal mine located in Suixi County, Huaibei City, Anhui Province. Its primary constituents are SiO 2 and Al 2 O 3, predominantly comprising minerals such as quartz and kaolinite. The coal gangue contains 11.69 % organic matter with a δ 13 C value of −19.43

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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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Gangue Mineral

Key gangue minerals include quartz, iron carbonates (siderite and ankerite), and iron silicates (minnesotaite, greenalite, stilpnomelane, and cummingtonite) (Table 2.5).

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What is Gangue in Chemistry Definition

Gangue is generally an unwanted material or impurity that is present in an ore. This can be found in ore deposits where the mineral is present. During the process of extraction, these impurities are mixed up with ore in the form of stone, sand, rock, etc. The gangue must be separated from the mineral with the help of ore dressing or mineral ...

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Mechanical and Acoustic Emission Behavior of Gangue …

The chemical component of gangue is shown as Table 3. It indicates that, in coal gangue, SiO 2 has the highest content, and the higher content of SiO 2 is also often observed in the gravel. The high content of SiO 2 shows that the coal gangue can be used as the concrete aggregate. However, the gangue contains few easily weathered and hydrolyzed ...

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A short review of the sustainable utilization of coal gangue in

Coal gangue is a black-gray sedimentary rock associated with coal seams, composed of a variety of rock and mineral compositions. It is characterized by low carbon …

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Experimental investigation on the mixture optimization and …

The main crystal component of coal gangue is SiO 2. (2) Fly ash: The microstructure is mainly composed of intact spherical particles with small pores on the surface. The main crystal component is SiO 2, with a small amount of 3Al 2 O 3-2SiO 2 and CaCO 3. (3)

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Separation and Recovery of Valuable Carbon …

gangue through a Time-of-Flight Secondary Ion Mass Spectrometer (TOF-SIMS, ION TOF-SIMS 5, USA). A Bi1+ primary ion beam having an energy of 30 keV with an incident angle of 45° was rastered over a 400 μm × 400 μm area on the sample surface for coal gangue analysis. To collect secondary ions, this area was divided into a grid of 256 points ...

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Progress in the utilization of coal gangue for soilification …

This paper aims to investigate the fundamental components and properties of coal gangue, analyze the principles of its soilification, summarize the methods of preparing soil …

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A deep learning method based on multi-scale fusion for …

Coal-gangue recognition technology plays an important role in the intelligent realization of integrated working faces and coal quality improvement. However, the existing methods are easily ...

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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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Representative coal gangue in China: Physical and chemical …

Representative coal gangue in China: Physical and chemical properties, heavy metal coupling mechanism and risk assessment. Author links open overlay panel Ding-yi Duan a, ... In addition to quartz, kaolinite and pyrite also exist in CG. Therefore, the essential components of CG samples are SiO 2, Al 2 O 3, Fe 2 O 3, CaO and other chemical ...

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Gangue | geology | Britannica

…of valueless minerals, collectively called gangue. The more concentrated an ore mineral, the more valuable the mineral deposit. For every mineral deposit there is a set of conditions, such as the level of concentration and the size of the …

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What is Gangue in chemistry?

Gangue is the impurity that surrounds or is closely mixed with the ore deposit in which the minerals are present. Gangue is composed of waste rocks, stone and extra unwanted …

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Coal Gangue: Composition, Processing, Use And …

Coal gangue is a fixed coal mining, washing, and processing product. It is a black-gray rock with lower carbon content and harder than coal associated with coal seams during the coal formation process. And its …

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Effect of Gangue Distribution on Compressive Strength …

The gangue content increased as the grade of the iron ore decreased. In granules composed of intermediate and fine ores, the influence of the gangue component on the com-pressive strength is expected to be large. Therefore, in this study, commercial iron ore and gangue-free ore were used for granulation, and the effect of the gangue components on

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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 …

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Comprehensive utilization and environmental risks of coal gangue: A

The main mineral component of coal gangue is clay minerals which are ingredients to meet brick production requirements. The energy in coal gangue functions in the process of brick making to realize the save of raw coals. In addition to the need of coal gangue to be crushed, the other production process is basically the same as that of clay ...

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The effect of biomass addition on pyrolysis characteristics and …

The pyrolysis experiment of biomass added to coal gangue was studied by thermogravimetric-Fourier transform infrared spectroscopy-mass spectrometry (TG-FTIR-MS) method. The multi-component reaction model was used to simulate the pyrolysis reaction of coal gangue and biomass. The most suitable model was obtained, and the pyrolysis mechanism …

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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 calcium, iron, zinc, selenium, sulphur, phosphorus and potassium, It contains ...

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Coal Gangue: Composition, Processing, Use And …

Coal gangue production of cement Cement production from coal gangue requires "two grinding and one burning"; that is, the coal gangue is combined with a certain proportion of limestone, ground into fine materials, and …

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Experimental study on municipal solid waste incineration

This study explores the potential of municipal solid waste incineration bottom ash (MSWI BA) and coal gangue as precursors for alkali-activated cementitious materials (CG-MBA). ... Experimental study on municipal solid waste incineration bottom ash as a component of alkali-activated coal gangue-based geopolymer Environ Sci Pollut Res Int. 2024 ...

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Progress in the utilization of coal gangue for soilification …

2.1 Main Components of Coal Gangue. Coal gangue is rich in major components . such as aluminum oxide (Al. 2 O 3), silicon dioxide (SiO 2), and iron oxide (Fe 2 O 3) [10], as shown in Table 1. Its chemical composition is diverse, primarily consisting of silicates, aluminates, and ferrites, along with a certain amount of organic matter, water,

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Creep characteristics and models of unconfined and BFRP …

Coal gangue, a type of by-product from coal mining and washing, is steadily increasing per year in China [1]. ... As identified through X-ray fluorescence analysis, the primary chemical component of coal gangue is detailed in Table 1, mainly composed of SiO 2 (61.69 %) and Al 2 O 3 (19.11 %), ...

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Main components of the coal gangue.

Download scientific diagram | Main components of the coal gangue. from publication: Extraction of Aluminum and Iron Ions from Coal Gangue by Acid Leaching and Kinetic Analyses | Extracting ...

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In this paper, the main components of the coal gangue in Ordos City were carried out by X-ray flu-orescence spectrometry (XRF) and X-ray diffraction (XRD), the element analysis, composition

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The effect of biomass addition on pyrolysis characteristics and …

Coal gangue has the characteristics of high ignition temperature, high ash content and low volatile matter. ... Component 5 mainly occurs in the range of 225–610 °C, which is due to the decomposition of lignin. Table 2. Participation degree and R 2 of each component in the multi-component model of PS pyrolysis reaction. Degree of participation

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