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  • Characterization studies on coal gangue for sustainable ...

    高达12%返现 · Feb 05, 2020 · This test is to find the chemical composition of coal gangue material. From the results presented in Table 1, it can be observed that the predominant chemical composition comprised of silica (52.7) and alumina (22.5) and accounted for 75.2%. The chemical composition of coal gangue is almost close to natural soils [ 48] except for alumina phase.

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  • The metal ions release and microstructure of coal gangue ...

    高达12%返现 · Aug 31, 2013 · The coal gangue has abundant alkali metal and alkaline earth metal. The released major pollutants in coal gangue are Ca and Mg ions. The structure of coal gangue is loose after weathering. The mineral composition of coal gangue can contact fully with the acid and alkali chemical solutions.

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  • Research on the Ecological Protection of Coal Gangue

    Nov 18, 2021 · Coal gangue is solid waste discharged in the process of coal mining and washing. It is a black, grey rock with a lower carbon content and harder structure than coal and is associated with the coal seam in the process of coal formation.

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  • Improvement on pozzolanic reactivity of coal gangue by ...

    Jul 01, 2013 · Coal gangue is a typical inert solid waste discharged when coal is excavated and washed in the production. In China, the total of accumulative stockpile of coal gangue has reached 4.5 billion metric tons [1]. Their major mineralogical compositions are stable aluminosilicate minerals at the ambient conditions, such as quartz and feldspar.

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  • THE THERMAL TRANSMISSION BEHAVIOR ANALYSIS OF TWO

    The main chemical components of coal gangue are SiO 2 , Al 2 O 3 , and carbon, in addition to TiO 2 , Fe 2 O 3 , CaO, K 2 O, Na 2 O, etc. [12-14]. Its mineral components mainly include clay minerals (kaolinite, sericite), quartz, calcite, pyrite, siderite and carbo- naceous minerals [15, 16].

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  • Mechanical Properties of Furnace Slag and Coal Gangue ...

    Nov 22, 2021 · Coal gangue is a rock type with lower carbon content and higher hardness compared with coal. Coal gangue comprises multiple rocks and forms one of the primary wastes in coal production. Although >300 million tons of coal gangue are discarded each year, China’s utilization rate of coal gangue has reduced [ 1, 2, 3, 4 ].

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  • Investigation of phosphate removal from aqueous

    Apr 25, 2017 · The maximum phosphate adsorption capacity of new discharged coal gangue is over 2.504 mg/g (as P), while the maximum phosphate adsorption capacity of spontaneous combustion coal gangue is over 7.076 mg/g (as P), which indicated that the spontaneous combustion coal gangue is more suitable for use as an adsorbent.

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  • Coal | National Geographic Society

    Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity.It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning). Coal is the largest source of energy for generating electricity in the world, and the most abundant fossil fuel in the United States.

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  • Trace Elements in Coal Gangue: A Review | IntechOpen

    Dec 20, 2017 · 2.1. The mineral and chemical composition of coal gangue. Generally, the main mineral phases of coal gangue are kaolinite, quartz, pyrite, illite, calcite, ankerite, and montmorillonite [36, 37].The coal gangue samples

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  • Coal gangue – Electro Magnetic Industries

    The recycled coal can be used for power boiler fuel, washed gangue can be used for construction materials, and pyrite can be used as chemical raw materials. Fourth stage To produce building materials: Using coal gangue for brick production instead of clay as a raw material, by this way, can reduce fertile land dig

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  • Reliability-Based Design Optimization of Chemically ...

    Mineralogical and chemical characteristics of coal gangue are comparable to coal-combustion residues like coal ash and fly ash which are widely used in

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  • Research on Compressive and Flexural Properties of Coal ...

    Abstract: Coal gangue-slag geopolymer is a kind of environment-friendly material with excellent engineering performance and is formed from coal gangue and slag after excitation by an alkaline activator. In this study, three kinds of coal gangue-slag geopolymer were activated by different

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  • Assessment of heavy metal in coal gangue: distribution ...

    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 gang

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  • Extraction of alumina from alumina rich coal gangue by a ...

    Coal gangue is an industrial solid waste produced by coal mining and processing [1–3]. The average production of gangue accounts for 10–15% of raw coal production [4,5], making coal gangue one of the biggest solid wastes in China. At present, utilization ratio of coal gangue can reach about 60% in some countries. There are still

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  • CN101450811A - Method for extracting alumina from coal ...

    The invention mainly relates to a method for extracting alumina from coal gangue. The coal gangue is ground, and then is calcined through a fluidized furnace and iron is removed through a magnetic separator, the coal gangue with the iron removal reacts with an acid to obtain an aluminum chloride solution without silicon impurities, the solution containing the aluminum is

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  • Bacterially induced CaCO3 precipitation for the ...

    On the basis of analyzing coal gangue’s chemical and mineral compositions, the structure change of coal gangue during the mechanical activation was investigated by

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  • The structural and surface properties of natural and ...

    Apr 01, 2017 · The results suggest that the coal gangue studied here could be used as inexpensive adsorbent in industrial wastewater pretreatment. A novel application of coal gangue as inexpensive adsorbents is considered in this study. The structural and surface properties of natural and modified gangue were studied via nitrogen adsorption. Four types of samples

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  • Bacterially induced CaCO3 precipitation for the ...

    The two types of coal gangue used in this study were from the same mining area, with various colors (white and black). The chemical composition of each type of coal gangue was tested by use of X-ray Fluorescence (Bruker S8 Tiger, XRF) and can be seen in Table 1.The apparent density and bulk density of white gangue (WG) and black gangue (BG) are shown in Table 2,

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  • CN102180491B - Method for extracting aluminum oxide from ...

    The invention discloses a method for extracting aluminum oxide from coal gangue, which comprises the following steps of: mixing and grinding the broken coal gangue and sodium carbonate in a certain ratio, roasting, performing circular extraction, precipitating, filtering, decomposing carbon, recycling carbon dioxide and an auxiliary agent, washing, calcining and

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  • Investigation of phosphate removal from aqueous solution ...

    Apr 25, 2017 · The maximum phosphate adsorption capacity of new discharged coal gangue is over 2.504 mg/g (as P), while the maximum phosphate adsorption capacity of spontaneous combustion coal gangue is over 7.076 mg/g (as P), which indicated that the spontaneous combustion coal gangue is more suitable for use as an adsorbent.

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  • Study on capillary water absorption properties of ...

    Portland cement. Coal gangue ceramsite: made of coal gangue produced in a coal mine in Shenmu, Shaanxi, with the particle size of 4–6 mm, the apparent density of 1923 kg/m3, the water absorption rate of 6.68% and the crushing index of 20.8%. The X-ray diffraction (XRD) pattern of coal gangue is shown in Fig. 1 and the relative chemical ...

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  • Ziqi LV | China University of Mining & Technology Beijing ...

    Online detection of coal and gangue is the key to intelligent separation of coal and gangue which is significant for improving coal mining efficiency and deducing environmental pollution.

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  • Reliability-Based Design Optimization of Chemically ...

    Mineralogical and chemical characteristics of coal gangue are comparable to coal-combustion residues like coal ash and fly ash which are widely used in

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  • Physical and chemical properties and distribution ...

    Mar 01, 2014 · The substrate made of coal gangue has more inferior physical-chemical properties. Considering the indicators, the conclusion is that several indicators of B test plot are better than the others, so a soil depth of 70-80 cm is a more economical and rational top-soil depth for reclaimed land when using coal gangue as a filler.

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  • Research on Compressive and Flexural Properties of Coal ...

    Abstract: Coal gangue-slag geopolymer is a kind of environment-friendly material with excellent engineering performance and is formed from coal gangue and slag after excitation by an alkaline activator. In this study, three kinds of coal gangue-slag geopolymer were activated by different

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  • Review of Coal Gangue Characteristics and Ecological ...

    May 01, 2021 · Coal gangue has become one of the industrial wastes with the largest annual discharge and accumulated stock in China. The disorderly accumulation of coal gangue not only occupies a large amount of land resources and causes natural disasters, but also pollutes the surrounding ecological environment, which in turn affects human health and normal production

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  • Mechanism on Activation of Coal Gangue Admixture,Advances ...

    Sep 28, 2021 · Coal gangue, an industrial waste, is rich in silicon and aluminum phase and may be used as a mineral admixture in concrete after moderately stimulating activity, allowing for efficient solid waste utilization. This study used a mortar strength and activity evaluation method to investigate single or compound activation methods to find the optimum activation method of

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  • Efficient Extraction of SiO2 and Al2O3 from Coal Gangue by ...

    Coal gangue is mainly composed of SiO2, Al2O3 and other components. It is a huge reserve of aluminum and silicon resources. The coal gangue stockpiles in China is more than 5 billion tons at present, of which contain Al2O3 more than 1 billion tons, SiO2 more than 2.5 billion tons. It will make supplement for the lack of bauxite resources in China to some extent by extracting

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  • How a Roller Crusher Crush Coal Gangue | Fote Machinery

    Jul 12, 2021 · Coal gangue contains various elements, especially rare elements, and the highest content of chemical components is SiO 2 and Al 2 O 3. There are three main types of coal gangue for chemical use: the first is to extract a rare element in coal gangue by various methods, such as Ga, Se, Ti, Co, etc.

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  • Bacterially induced CaCO3 precipitation for the ...

    On the basis of analyzing coal gangue’s chemical and mineral compositions, the structure change of coal gangue during the mechanical activation was investigated by

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  • China Coal Gangue Industry Market Research and Investment ...

    May 23, 2014 · However, the coal gangue can be the rich natural resources and with a broad application prospect in industry, agriculture, and building industry. Presently, the coal gangue in China is mainly used in power generation, brickmaking, cement-making, production of chemical products, and fertilizer-making.

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  • Bacterially induced CaCO3 precipitation for the ...

    The two types of coal gangue used in this study were from the same mining area, with various colors (white and black). The chemical composition of each type of coal gangue was tested by use of X-ray Fluorescence (Bruker S8 Tiger, XRF) and can be seen in Table 1.The apparent density and bulk density of white gangue (WG) and black gangue (BG) are shown in Table 2,

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  • Micro‐pore structure characteristics and macro‐mechanical ...

    Coal gangue ceramsite is processed from coal gangue produced in a coal mine in the Shenmu area (Shaanxi province, China), with a particle size of 4–8 mm, the apparent density of 1650 kg m−3, the water absorption rate of 6.68%, and crushing index of 20.8%. The chemical composition of coal gangue

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  • 1. Introduction

    Coal gangue was dredged from the northern part of China, with a maximum particle size of 25 mm, bulk density of 1191.3 kg/m 3, and water absorption rate of 8.23% (Figure 2). The chemical composition of coal gangue and other mature admixtures (such as slag and fly ash) were analyzed by XRF. Table 2 illustrates the results. The three admixtures ...

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  • The Microstructure and Adsorption Property of Improved ...

    Since coal gangue can destroy the environment, we aim at improving coal gangue to absorbing material by changing it in different temperature and chemical liquor. Base on the microstructure and the adsorption experiment, we detect microstructure and absorption property of improved coal gangue. The microstructure experiment shows that the average pore size and specific

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  • Excess sulfur and Fe elements drive changes in soil and ...

    Jun 26, 2020 · Coal mining is indispensable due to the widespread use of coal, and gangue is the accumulated solid waste byproduct that persists in mined lands, even after the mines have been abandoned 1.In the ...

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