In this research, the micro-structural characterization of the hydration products of red mud-coal gangue based cementitious materials has been investigated through SEM-EDS, (27)Al MAS NMR and (29)Si MAS NMR techniques, in which the used red mud was derived from the …
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In the process of the coal gangue hill explosion, a lot of harmful gases can be released, which seriously pollutes the atmospheric environment and is harmful to people’s health; meanwhile, equipments and the surrounding buildings can also be destroyed, which brings huge economic losses and casualties. In addition, social problems caused by coal gangue hills will become a thorny problem for ...
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Aug 23, 2017 Coal-gangue is generated from the process of mining and beneficiation of coal, which accounts for approximately 10–15 mass% of coal production [].Coal-gangue, as one of the largest sources of industrial solid waste in china, causes damage to environment, including acid drainage, heavy metals leaching as well as atmospheric pollution [2, 3].Coal-gangue usually could be used as an …
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Coal gangue, which has a similar composition to clay [], is a solid waste produced during coal mining and processing [6,7,8,9,10], and its annual production accounts for about 10% to 15% of the coal output in that year [6,7,11].Fresh undisturbed coal gangue does not have pozzolanic activity [], which in general leads to the low strength of coal gangue aggregate concrete and severely limits its ...
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This coal gangue company list contains a wide range of coal gangue factories serving all industries. This trusted vertical directory contains premier China suppliers/vendors, trading companies, custom manufacturers (OEM/ODM) and plants. They are experienced China exporting manufacturers offering tens of thousands of high-quality, competitive ...
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Mar 01, 2021 On this basis, the coal gangue was used as coarse aggregate instead of some natural stones, and the influence of different temperatures on the compressive properties of coal gangue aggregate concrete was studied. The results show that the compressive strength of gangue concrete is lower than that of ordinary concrete at room temperature.
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Study on Mechanical Properties of PET Fiber-Reinforced Coal Gangue Fine Aggregate Concrete Yanlin Huang, An Zhou; Affiliations Yanlin Huang College of Civil Construction and Environment, Hubei University of Technology, Wuhan 430068, China An Zhou College of Civil Construction and Environment, Hubei University of Technology, Wuhan 430068, China ...
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Feb 02, 2020 Coal gangue from Changzhi is named coal gangue III. Coal gangue from Yulin is named coal gangue IV. The mineral analysis [25,26] on coal gangue and fly ash were done by the same authors from this article. It can be demonstrated that coal gangue has quartz (SiO 2), mullite (3Al 2 O 3 2SiO 2), hematite (FeCO 3), calcite (CaCO 3), feldspar ...
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The invention discloses a coal gangue pyrolysis gasification crude gas purified combustion recycling device which comprises a coal gangue pyrolysis device of a gangue pyrolysis gasification device, a water gas reaction device, a crude gas guiding device and an activity coke drying method recycling device; the coal gangue pyrolysis device comprises a pyrolysis vaporizing chamber, an …
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Mar 08, 2021 Coal gangue is an abandoned rock discharged during coal mining and processing. When mining coal, the rock layers or bottom plates from the roof of the coal seam, as well as the various types of rock excavated and blasted from around the coal seam during the excavation are all called coal gangue. Generally, the comprehensive discharge of coal ...
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The influence of the wind coefficient distribution on coal reservoirs for coal gangue is very important to its wind-resistance design. Take a real coal reservoir in Ordos for example, the wind pressure is numerically simulated with the help of Fluent Software. Because of the coal gangue piples, the average wind coefficient absolute obviously reduced under most of the wind directions, but the ...
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Coal gangue is a heterogeneous material, and the total concentrations of heavy metals (Cd, Pb, Cu, Cr and Zn) in the surface (i.e., weathered) of the coal gangue dump were higher than deeper portions. In order to make the gangue samples to be representative, four samples from different depths (depth=2, 3, 4 and 5m) of the coal gangue dump were ...
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May 20, 2016 I. INTRODUCTION Coal gangue (CG) produced from coal mining and coal processing is one of the largest amounts of industrial solid wastes in China (Liu and Liu, Reference Liu and Liu 2010).More than 700 million tons of CG is generated annually in China and its resource utilization attracts many researchers’ attention (Bian et al., Reference Bian, Dong, Lei, Leng, Mu and Wang 2009; …
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Jan 20, 2020 Coal gangue is the largest solid waste produced by coal mines, accounting for about 10% of coal production. The annual emissions of coal gangue in China is about 150–200 million tons. Coal gangue causes solid, liquid and gas pollution, which not only wastes resources, energy and occupies a large amount of land, but also pollutes the ...
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Calcined coal gangue powder was used to partially replace Portland cement (PC) at 10%, 20%, 30%, and 40% by weight. The water to binder ratio (w/b) of 0.5 was used for all the blended cement paste mixes. The reaction degree of calcined coal gangue powder in calcined coal gangue powder/cement (AC) was determined using a selective dissolution method.
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In order to investigate the chloride ion penetration resistance of coal gangue concrete under multi-factor comprehensive action, the non-steady-state accelerated chloride ion migration test was used to test the chloride diffusion law of coal gangue concrete specimens by crack width, curing temperature and water-cement ratio. Three groups of crack width (0 mm, 0.05 - 0.12 mm, 0.12 - 0.2 mm ...
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The charcoal briquettes extruder machine is widely used for the molding of charcoal powder, coal foam, coal gangue, lignite, anthracite, iron powder, aluminum powder, and other raw materials. And it is often used with the wheel grinder mixer and briquettes cutting machine, and it is the common equipment in charcoal briquettes production line.
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Main Fuel Extraction of SiO2 and Al2O3 from coal gangue activated by supercritical water Fuel 2019 / 10 Vol. 253 Extraction of SiO2 and Al2O3 from coal gangue activated by supercritical water
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coal gangue soil greening gangue hill inert Prior art date 2007-02-02 Application number CNA2007100634755A Other languages Chinese (zh) Other versions CN100499992C (en Inventor 胡振琪 陈胜华 Original Assignee 中国矿业大学(北京) Priority date (The priority date is an assumption and is not a legal conclusion.
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Mar 27, 2020 Coal is one of the main sources of human energy. In the process of coal mining, separating gangue from coal has great significance for environmental protection and energy conservation. The core problem in the separation of gangue is the recognition of coal and gangue. In this study, multispectral technology was used to identify gangue. First, set up a data acquisition …
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Apr 04, 2019 For comprehensive utilization of the coal gangue from different locations, coal gangues were calcined at temperatures of 800 C, 900 C, and 1,000 C for 2 h, respectively, and then blended in cement with a replacement level of 10%, 20%, 30%, and 40% by weight to …
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Jan 09, 2018 Recognition of coal and gangue (roof rock) is a key technology to realize fully mechanized top coal caving automated mining. This paper proposes to detect the instantaneous refuse content of drawn ...
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The ratios of coal gangue to corncob were 20% and 40%, the temperature was over 200 C, and the co-pyrolysis of corncob and coal gangue had a certain synergistic effect. There is yet to be sufficient research on the synergistic effect of biomass and coal gangue combustion. In this paper, the co-combustion of biomass and coal gangue in ...
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Coal gangue is one of the major solid wastes produced as a result of coal mining and its washing. Generally, the total discharge capacity of coal gangue can reach up to 10–15% of the total raw coal extraction [10]. In China, approximately 315 million tons of coal gangue is produced on annual basis, with a total piling of about 4.5 billion ...
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Jun 14, 2021 The coal gangue is produced by Pingdingshan mine with a particle size of 5～20 mm, in which the moisture content is 5.50% and crushing index is 18%. The water reducing agent (SP) is polycarboxylic acid with reducing the rate of 18%. The cubic compressive strength of …
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The results show that with the increase in alkali equivalent from 1% to 7%, the unconfined compressive strength of the alkali-activated coal gangue road stabilization material initially increases and then decreases, with 3% being the optimal group in terms of stabilization, the aggregate ratio of coal gangue increases from 70% to 85%, and the 7-day unconfined compressive strength of the stabilized material …
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Mar 01, 2021 Coal gangue, as a solid waste generated during coal mining and washing, not only encroaches on a large number of land resources but also poses certain risks to the environment. It is reported that the cumulative amount of coal gangue piled up in China has reached 6 billion tons, and the annual discharge amount is about 500–800 million tons.
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Jan 25, 2021 The coal gangue was crushed and sieved according to GB/T 14685-2011 for the preparation of ordinary concrete. The particle size of the sieved coal gangue coarse aggregates was in the range of 5 mm–35 mm. The basic physical properties of natural gravel and coal gangue were tested as listed in Table 1
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Coalgangueisthesolidwasteproducedintheprocessof coal mining and processing, and it is one of the largest industrial solid wastes in China [6, 7]. After crushing, cleaning, and screening, coal gangue can replace natural aggregatetoproduceconcrete,whichcannotonlyreduce the stacking amount of solid waste …
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