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The addition of geogrid significantly improved the shear stress and interfacial quasi cohesion of geogrid coal gangue whereas the interfacial quasi friction angle remained almost unaffected When normal stress was greater than 25 kPa the shear stress gradually increased as the shear rate was increased from 1 to 5 mm/s
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It is found that when coal and gangue fall the characteristics of vibration signals generated by coal and gangue shocking the tail boom are different First EEMD algorithm is used to decompose the original vibration signals into intrinsic mode functions IMFs Each IMF represents the distribution of energy from high to low
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Formation of mesoporous materials of coal fly ash CFA 40 g was placed in a 2 000 ml flask containing 800 ml of NaOH 5% solution and stirred with a magnetic stirrer at 40°C for 4 h The solution was then cooled down to room temperature and 80 ml HCl 10% was added into the alkali CFA solution
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Coal gangue a by product of coal mining and washing is a major solid waste [ 6 7 8 9 10] that not only occupies plenty of land but also results in a series of environmental problems such as the water soil and atmospheric pollution [ 11 12 13 14 15 ]
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The preparation of underground backfill material from CSW can be used for large scale disposal of solid waste The proportion of backfill material plays an important role in transportation and backfilling effect and the mix proportion optimization of backfill material is essentially a multi factor and multi objective optimization problem In this paper to obtain the mix proportion of
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According to differences in the composition and properties of coal gangue especially differences in Hardgrove grindability index HGI the present disclosure performs hierarchical crushing and screening to separate coal gangue into coal sand stone and soil The coal can be used as a fuel for a coal gangue power plant or as an ordinary fuel
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There are large areas of spontaneous coal combustion in northern and northwestern China The quantification of greenhouse gas GHG emissions resulting from spontaneous coal combustion is an important step toward determining proper management practices to reduce such emissions in the future The present study investigated the GHG emission characteristics of the spontaneous combustion of 10
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COALIA comprend 7 laboratoires distincts caractérisation des matériaux chimie transformation préparation de formulations petite et moyenne échelle traitement du chrysotile traitement de minerais et micronisation Il dispose d un parc d équipements à la fine pointe de la technologie qui compte plus de 200 appareils et instruments De plus
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Gangue Crystals of cassiterite a commercially valuable ore mineral in a matrix of quartz the gangue Banded Zn Pb ore sample with sphalerite brown and galena as main ore minerals and calcite as main gangue mineral old Bad Grund mine Germany
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Coal gangue contains a small amount of Mn Cu Zn Ti Ba Cl and other elements After weathering the contents of each element were reduced 3 Under the same conditions a higher number of heavy metal elements precipitated from the weathered coal gangue than from the fresh coal gangue
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As shown in Table 4 the chemical composition of coal gangue is mainly % SiO 2 and % Al 2 O 3 and % Fe 2 O 3 with a small quantity of K 2 O % Fig 2 shows the crystalline structure of coal gangue We can deduce that the major crystalline components of the coal gangue were quartz 01 085 0794 chamosite #01 085
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A large amount of the low melting point dendrites effectively backfill the cracks between the grains and then increase the grain growth rate Thus two neighboring grains can bond together at a fast rate decreasing the solidification crack tendency
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The thermal behavior of two mineral type coal gangues under different temperature conditions was investigated by heating treatment of kaolinite type coal gangue and illite type coal gangue based on thermal analysis X ray diffraction XRD infrared spectroscopy IR and scanning electron microscopy SEM Thermogravimetric differential thermogravimetric and differential scanning calorimetry
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The Bruker M4 Tornado X ray fluorescence device was used to determine the oxide composition of the cement CM and QKS The A Performance of Coal Gangue Based Cemented Backfill Material Modified by Water Reducing Agents Adv Mater Sci Eng 2024 2024 2302895 DOI /2024/2302895
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The main mineral components of coal gangue include quartz kaolinite and muscovite In addition high temperature calcination weakens the diffraction peak of kaolinite and enhances the diffraction peak of quartz
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Table 1 reveals that the main chemical compositions of CGA raw are SiO 2 % and Al 2 O 3 % In addition CGA raw contains a small amount of Fe 2 O 3 % CaO % carbon and organic matter and its loss of ignition is %
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Based on the oxide content of CG CG can be divided into clay gangue SiO 2 40 70% Al 2 O 3 15 30% sandstone gangue SiO 2 > 70% aluminum gangue Al 2 O 3 > 40% and calcareous gangue CaO > 30% [ 40 ] CG is mostly composed of silicon and aluminum Table 1 shows the chemical components of CG in different regions
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The coal gangue was crushed by using a steel hammer after which it was mixed fully then four particle size groups were divided by using stainless steel sieves cm P1 1 cm P2
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Iron impurities mainly existed in pyrite with a content of % Calcination test of coal gangue shows that Pyrite began to be oxidized at 850 ℃ to form hematite When calcined at 1 000 ℃ for 2 hours the carbon content in coal gangue was reduced to below % and the sulfur content was also reduced to %
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The chemical composition and changes of coal gangue before and after leaching were determined by XRD technology Through the continuous static soaking and dynamic leaching experiments of simulated precipitation the coal gangue was investigated under different solid liquid ratio particle size pH and soil medium conditions
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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/m 3 the water absorption rate of % and the crushing index of %
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With the aim of solving the problem of coal congestion caused by big coal blocks in underground mine scraper conveyors in this paper we proposed the use of a YOLO BS YOLO Big Size algorithm to detect the abnormal phenomenon of coal blocks on scraper conveyors Given the scale of the big coal block targets the YOLO BS algorithm replaces the last layer of the YOLOv4 algorithm feature
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Affiliations 1 School of Civil Engineering and Communication North China University of Water Resources and Electric Power Zhengzhou 450045 China 2 State Key Laboratory of Eco Hydraulics in Northwest Arid Region Xi an University of Technology Xi an 710048 China PMID 35806620 PMCID PMC9267344 DOI /ma15134495
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Generally the main mineral phases of coal gangue are kaolinite quartz pyrite illite calcite ankerite and montmorillonite [ 36 37 ] The coal gangue samples are usually dominated by silicon dioxide and aluminum oxide followed by ferric oxide and potassium oxide accompanied with some trace elements [ 37 ]
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Coal gangue is a loose deposit with unique particle structure and composition The physical and mechanical properties of coal gangue compaction are significantly different from other loose materials The theoretical research on DC method is in development stage and is primarily carried out on soil with varying traits
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Coal gangue is a mixture of various mineral rocks that is co occurred with the coal seam during the production process of coal preparation plant Generally speaking carbon clay rocks sandstone carbonate and aluminous rocks are the main components of coal gangue
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Download scientific diagram Chemical composition of coal gangue from publication Experimental Study of the Mechanical and Microstructure Characteristics of Coal Gangue Road Stabilization
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However coal gangue also has resource properties and its inorganic components are mainly silicon aluminum oxides and some rare metals which are similar to fly ash and slag [3 4] Nonetheless coal gangue has low self activity it must be treated to stimulate its potential activity
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It is deposited from solution often along with calcite and halite as gangue in sulfide mineral deposits How does anhydrite turn into gypsum It has a chemical composition of iron sulfide FeS 2 and is the most common sulfide mineral It forms at high and low temperatures and occurs usually in small quantities in igneous metamorphic
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The main chemical components of raw coal gangue are SiO 2 and Al 2 O 3 while its main mineral components include kaolinite illite and quartz Kaolinite minerals can be used as an excellent auxiliary cementitious material after activation treatment [ [4] [5] [6] [7] [8] ]
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