Proportion of rock in coal gangue
  • Trace Elements in Coal Gangue: A Review | …

    13.04.2017· Coal gangue is one of the largest industrial residues. It has high ash content, low carbonaceous content, and heating value. Meanwhile, it has some trace elements. Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land. Now, coal gangue utilization is a matter of great concern …

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  • Assessment of heavy metal in coal gangue: …

    In the process of excavation and utilization of the coal gangue hill, gangue at different weathering degree was exposed to the environment, which can be harmful to the surroundings. In order to find the law of heavy metal release and to evaluate the potential ecological risk, five kinds of coal gangue at different weathering degrees were collected from a coal mine named Suncun, an over 100 ...

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  • TheEffectofAcidMineDrainageCorrosionontheCreep ...

    Table 1: Physical composition of coal gangue. Substances Proportion Substances Proportion (%) SiO 2 47 TiO 2 1.24 Al 2O 3 32.66 P 2O 5 0.17 Fe 2O 3 1.01 Na 2O 0.29 CaO 1.18 K 2O 3.09 MgO 0.42 MnO 2 0.009 SO 3 0.18 Loss on ignition 12.64 Table 2: Mineralogical composition of coal gangue. Minerals Proportion (%) Siltite 8.5 Medium-grained sandstone 42.7 Fine-grained sandstone 13.6 …

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  • (PDF) Selenium in Chinese coal gangue: …

    PDF | Coal gangue accounts for a large proportion of the solid waste in China, and greater attention has been focused on the concentrations of... | Find, read and cite all the research you need on ...

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  • Coal Gangue Crushing and Screening - JXSC Mine

    Coal Gangue is a kind of solid waste discharged from coal mining and coal washing. It is also a kind of black-gray rock with lower carbon content and harder than coal. Its main components are Al2O3 and SIO2. In addition, it contains various amounts of Fe2O3, Cao, MgO, Na2O, K2o, P2O5, SO3 and traces rare elements (gallium, vanadium, titanium, cobalt). The rock mineral composition of coal waste ...

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  • Enhanced mechanical properties and durability of …

    10.09.2019· However, for the mixture with coal gangue percentage from 42% to 67%, a significant increase was observed with excellent linearity, due to the formation of coal gangue skeleton. When the coal gangue content was below 42%, coal gangue aggregate particle is distributed separately and cannot form the continuous skeleton in the mixture. In this case, the strength of the mixture was mainly …

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  • Is the Drying Process of Coal Gangue Essential? …

    Coal gangue is the dark gray rock with low carbon content and low heating value, which is harder than coal. Coal gangue is mainly composed of inorganic matter including Al, Si, O, Fe, CA, Na, Mg, K, P and Ti. It also contains some heavy metals and rare-earth elements. Among them, SiO2, and Al2O3 account for the largest proportion, the proportion of SiO2 is generally 40%~60% and Al2O3 is about ...

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  • Gangue - Wikipedia

    In mining, gangue (/ ɡ æ ŋ /) is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit.It is thus distinct from overburden, which is the waste rock or materials overlying an ore or mineral body that are displaced during mining without being processed, and from tailings, which is rock already stripped of valuable minerals.

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  • Extraction of Coal and Gangue Geometric Features with ...

    Gangue is a kind of black or gray rock with low carbon content. It is inherently contained in the raw coal in the current coal mining process. Gangue is usually treated as waste in the coal industry, although gangue can be made into construction materials. The proportion of gangue in different mining sites can be various due to the complicated crustal movements [1]. Therefore, it is essential ...

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  • PAPER OPEN ACCESS Effects and mechanisms of slag ...

    The coal gangue selected (clay rock coal gangue) was calcined at a constant temperature of 700°C for 2 hours. Table 1 shows that the primary chemical compositions of calcined coal gangue and slag. In the experiment, the alkali activators were used 96% sodium hydroxide(NS) and sodium silicate(NS) with a modulus of 3.22 (26.5% SiO. 2, 8.5% Na. 2. O, 65% H. 2. O). Figure 1 demonstrates the XRD ...

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  • Gangue - Wikipedia

    In mining, gangue (/ ɡ æ ŋ /) is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit.It is thus distinct from overburden, which is the waste rock or materials overlying an ore or mineral body that are displaced during mining without being processed, and from tailings, which is rock already stripped of valuable minerals.

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  • Extraction of Coal and Gangue Geometric Features with ...

    Gangue is a kind of black or gray rock with low carbon content. It is inherently contained in the raw coal in the current coal mining process. Gangue is usually treated as waste in the coal industry, although gangue can be made into construction materials. The proportion of gangue in different mining sites can be various due to the complicated crustal movements [1]. Therefore, it is essential ...

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  • coal gangue coarse

    Coarse coal refuse can vary in size from approximately 100 mm (4 in) to 2 mm (No. Other waste rock (gangue) excavated from the ore body, and any coarse... The effect of coarse gangue particles during the coal flotation Know More. 4 Oct 2016 It is well known that fine gangue particles play an important role in contaminating the concentrate during coal flotation process. However, the ...

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  • Characterization and Identification of Coal and ...

    Because of the high organic carbon concentration in carbonaceous shale, a large proportion of carbonaceous shales are often misclassified into coals using visible and near-infrared (VIS-NIR) reflectance spectroscopy in the field of coal-gangue identification of hyperspectral remote sensing of coal mine. In order to study spectral characterization of coal and carbonaceous shale, three ...

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  • Experimental Study on Properties of Rock …

    Properties of rock-cemented coal gangue-fly ash backfill (CGFB) bimaterials determine the effects of strip CGFB mining on controlling the surface subsidence in coal mines, which are affected by the coal gangue particle size in CGFB. In this paper, uniaxial compression tests were conducted on the coarse sandstone-CGFB composite samples with different coal gangue particle sizes, and their ...

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  • Performance of cemented coal gangue backfill

    Residual coal, organic substance and soft rock within gangue will exert a great influence on its engineering characteristics. Density and structure of gangue will be changed by weathering and breakage of soft rock, self-combustion of residual coal and metamorphism of organic substance[10]. Consequently, gangue is compressed and its shear ...

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  • Microstructure of Coal Gangue and Precipitation …

    01.01.2017· In addition, the overlying cap rock fracture development and coal mining process will result in mine water emission; thus, the coal gangue fillings in the goaf are consequently always immersed in a water environment [1-3]. After long-term mine-water leaching and soaking, the heavy metal elements and inorganic salts in this part of the coal gangue will be released after dissolving in water ...

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  • Characterization of heavy metals in coal gangue …

    01.03.2018· The surface soil fractionation showed that soils were dominated by the fraction of fine aggregates of 74–420 μm (20.5–25.1%) and coarse aggregates of > 1880 μm (39.9–43.6%). The smallest fraction (< 74 μm) was only 6.53% in agricultural land, 5.12% in orchard, 5.9% in forest and 6.21% in culture pond.

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  • ExperimentalStudyonPropertiesofRock-CementedCoal Gangue ...

    coal gangue, fly ash, cement, slag, and alkaline activator mixed with sodium hydroxide and sodium silicate, and its properties were studied, including the localized deforma-tion, microstructure, and creep properties. e aforementioned investigations are important for understanding the properties of CGFB. While few studies have focused on the properties of the rock-CGFB bimate-rials, Chen et al ...

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  • Effect of organic matter on the Rietveld …

    The presence of organic matter, however, has interference in varying degree to the quantitative result. In this work, the mixed samples of organic matter and crystalline minerals at given proportions were prepared to investigate the effect of organic matter on the Rietveld quantitative analysis of crystalline minerals in coal gangue. The ...

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