It is well known that the transporting and crushing of outburst coal is the main pathway of energy dissipation during the coal and gas outburst process.A scientific method for evaluating the dust generation capacities of coal samples with varying properties and moisture contents is of great significance for the Analysis on the impact crushing dust generation test method
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Coal and gas outburst is a coal-rock dynamic disaster caused by the combined action of multiple factors, accompanying by the impact crushing on coal In view of the depletion of high-quality coal resources and the urgent need for green utilization of difficult washability coal resources in China, research on the geological Occurrence of Minerals in Coal and Its Geological
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In this study, the crushing of coals due to action of rigid conical indenters and formation of small coal particles is investigated. The studies are based on the coal-forming environment on the occurrence of minerals in coal, which led to the removal of minerals in the coal washing procedure. The process is controlled by the occurrence Occurrence of Minerals in Coal and Its Geological
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Abstract. A scientific method for evaluating the dust generation capacities of coal samples with varying properties and moisture contents is of great significance for In this study, the raw coal was collected from different coal seams in the south of Qinshui Coalfield, and flotation experiments were carried out in the laboratory Occurrence of Minerals in Coal and Its Geological
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crushing ability of stone (waste rock) and coal. Therefore, the decision on its use, in the case of using the dry method of stone re- moval, should be preceded by The impact crushing dust generation method, which attributes coal dust generation to a single variable, i.e. energy, avoids the interference terms such as the conical pick angle, depth andAnalysis on the impact crushing dust generation test method
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Coal structure, including primary coal, cataclastic coal, granulated coal, and mylonitized coal, is one of the key factors controlling coal and gas outburst, and it also determines the efficiency of coalbed methane (CBM) extraction. Therefore, it is significant to identify the characteristics of coal structures and to predict them in advance. In this work, the spatial Abstract The correlations of the composition, structure, and properties of coal from Ukraine, Russia, Canada, Australia, the Czech Republic, Poland, and Indonesia with its Hardgrove grindability index are investigated. It is found that the Hardgrove grindability increases with increase in total carbon content Cdaf and aromatic carbon Hardgrove Grindability of Coal. Part 1. Correlations with
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To study the particle size distribution and energy variation law of hard coal under a load, an impact compression test of hard coal specimens under different impact loading conditions was carried out using a Φ50 mm diameter Separate Hopkinson Press Bar (SHPB) test system. We implemented the theory of dynamic impact energy of rock to Therefore, part of the outburst energy was consumed in the coal impact crushing [4], and the study of coal impact crushing is of great significance to explore the occurring mechanism and development process of coal and gas outburst. Scholars hold different views on the energy sources that lead to the coal crushing [5], [6], [7], [8].Experimental study on particle size distribution of impact crushed coal
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The assumptions for coal drying are the following: target moisture of 5% from current coal moisture of 14.5% at P1 and P2, and 20% at P3; drying energy requirement of 2.56 MJ/kg water removed based on an average of seven coal drying technologies presented by Karthikeyan et al. (2009); and drying is done at the crushing The large-scale coal industry laid the foundation for rapid economic development in China.1−3 Nearly 80% of the energy required for power generation, 70% of raw chemical materials, and 60% of energy consumed in commerce are provided by coal.4,5 This energy structure determines the characteristics of coal Occurrence of Minerals in Coal and Its Geological
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The precondition for the sustainable development of outburst is crushing and transport of coal mass. As for the coal crushing, the original lump coal is crushed into outburst coal mass in the form of small particles, which is of great significance to rapid desorption of adsorbed gas. The coal crushing needs energy consumption in order to1. Introduction. Rockbursts and coal-gas outbursts are common impact dynamic disasters in coal mining (He et al., 2021; Jiang et al., 2017; Kong et al., 2021; Li et al., 2021; Mark, 2016; Wang and Cheng, 2023; Wang et al., 2022b).In the process of underground coal mining, the roof rock is a common location for the occurrence of Research on infrared radiation response and energy
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RESEARCH ARTICLE Study on the distribution pattern of particle re-crushing in the coal and rock mass crushing process under pressure Shuang Song ID 1*, Shugang Li1, Tianjun Zhang,Hongyu Pan1, Nan Liu2, Lei Zhang1 1 College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an, China, 2 College of Science, Xi’an To study the particle size distribution and energy variation law of hard coal under a load, an impact compression test of hard coal specimens under different impact loading conditions was carried out Research on Particle Size and Energy
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2.2 Coal resources mining characteristics. With the active promotion of China's carbon peaking and carbon neutralization work, China's energy supply has achieved remarkable results and production has grown steadily (Zhang et al 2022; Li 2021).As shown in Fig. 2, the raw coal production of China was 4.13 billion tons in 2021, up 5.7% year-on Clean utilization of coal depends on the quality of raw coal, which depends on the coal-forming parent materials (petrology and chemical composition of coal), the multiple media of the coal-forming environment, and some epigenetic conditions, such as thermal evolution (coalification), magmatic hydrothermal fluid, groundwater. Based on the Research progress and prospects of coal petrology and coal quality
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Adsorption, desorption, and gas flow in coal are closely related to pore distribution, thus the variations of porosity in coal are of great significance. To study the evolution of coal porosity, measuring balls with a radius of 15 mm were arranged at the center of the specimen.Comparative results of testing the susceptibility to crushing for the 33, 34, and 35 coal types-stone grains (waste rock) [43]. +3 The economic effect of selective crushing for different(PDF) Selective Crushing of Run-of-Mine as an Important
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mudstone and coal are aII regarded as highly brittle materials' At Aberdare East Colliery, down-dip development to obtain access to deeper coal reserves at the 400-500 m (i219-1524 ft)Selective Crushing of Run-of-Mine as an Important Part of the Hard Coal Beneficiation Process Piotr Matusiak 1,Daniel Kowol 1, *, Tomasz Suponik 2,Dawid M. Franke 2,Paweł M. Nuckowski 3Selective Crushing of Run-of-Mine as an Important Part
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As the National Mining Association reports, the coal industry is a vital source of jobs that create positive ripple effects throughout society and our economy. These include the direct employment of nearly 150,000 people and the creation of 3.3 jobs for every job in coal mining, for a total of more than 500,000 jobs.The compaction and re-crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry.(PDF) Experimental Investigation of the Compaction-Crushing
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the relative speed and average temperature of the coal layer. Therefore, an attempt was made in this paper to create a static crushing process on a laboratory scale, including a total abrasive interaction between the coal layer and the crushing elements, as well as mutual attrition of coal particles leading to its crushing [17–19].
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