Analysis on the impact crushing dust generation test method
The method of impact crushing dust generation uses impact force to crush coal in a confined space. Although not simulating the process of coal crushing by tapered In this study, based on the geological and mining conditions of Workface 822 of the Yuandian No. 1 Mine, we used theoretical analysis and numerical simulation Frontiers Near crushing mechanism of gangue-containing coal
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Experimental study on particle size distribution of impact crushed coal
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 The Hardgrove grindability index (HGI) is the most expedient. There is a close relation between HGI and the coal quality, as well as the power consumed in Crushing properties of coal SpringerLink
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Analysis and construction of the coal and rock
In order to realized real-time perception and accurate judgment of coal-rock cutting state information, this paper combined the field test sampling, construction technology of complex coal seam...An outburst fragmentation index was derived based on the work crushing the ejected coal, taking the maximum crushing work ratio as a reference. There is a A new method for coal and gas outburst prediction and prevention based
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Cutting mechanical study of pick cutting coal seams with coal
(1) On the basis of coal cutting theoretical research, the different forms of pick crushing coal and rock are analyzed, the layered rock mass model of coal seam with burst.11−13 However, there is no definite coal crushing index. In this study, using the self-developed gas release experimental equipment, the effects of different gas pressures Failure Mechanism of Gas-Bearing Coal during Outburst
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Analysis on the impact crushing dust generation test method
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 Among various methods proposed by different scholars, an electrical resistivity (ER) method is one of the non-destructive monitoring methods that can be successfully applied in intelligent health monitoring of civil engineering structures such as roads. After crushing, the particle sizes of coal waste rocks include 0–5 mm, 5–10 mm, An experimental investigation on the compaction characteristic of coal
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Sustainability Free Full-Text Research on the Physical and
The crushing station at the Halsey opencast coal mine is a necessary part of the mine’s production, and its high dust production and wide impact have become a very important issue for the company . The crushing stations in open-pit coal mines today are mostly open-sided. Most dust management methods use wet spray dust reduction.The double jaw crusher is designed for crushing hard materials, also quarried materials, sand and gravel, and recycling. [4, 5] crusher [4] The tie rod and compression spring ensure that the(PDF) SIZE REDUCTION BY CRUSHING METHODS
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Technology and engineering test of filling goaf with coal
Based on the greening and low interference disposal requirements of coal gangue in high-yield and high-efficiency mines in Inner Mongolia and Shaanxi, and by integrating the existing theories andCoal-rock recognition method of fully-mechanized coal mining-face based on improved U-net network model. Journal of China Coal Society, 46 (S1) (2021), pp. 578-589. View in Scopus Google Scholar. Strange, 2007. A.D. Strange. Robust thin layer coal thickness estimation using ground penetrating radar.A novel coal-rock cutting state identification model based
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Porosity Changes in Thermally-Treated Bituminous Coal
Coal has many closed pores that limit fluid escape. However, the evolution of these closed pores during pyrolysis has rarely been studied. Based on the method of opening closed pores through step-by-step crushing, this study investigated the pore structure of thermally-treated bituminous coal during crushing using low-field nuclear China is the world’s largest coal producer country. However, large-scale coal mining has led to severe environmental pollution issues such as surface subsidence and gangue piling up. The gangue discharging amount has ranked the first in the world and coal mine enterprises are facing enormous discharging reduction pressure. This paper Overview of Solid Backfilling Technology Based on Coal
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Effect of Coal Size on Coking Pressure and Coke Strength
the gas pressure in the plastic coal layer as a result of fine crushing of the high-coking pressure coal is caused by improved gas pressure permeability in the plastic coal layer due to the fine crushing. 2.1.2 Fine crushing of high-coking pressure coal at commercial coke-making plant Based on the findings in the laboratory test, we mass ratio of ejected coal particles, based on the theory of crushing work and energy, we developed a new coal particle fragmentation index, which can be fitted linearly to CES. The index is based on the f value, which makes up for the limitations of the forecasting method, and can be used more flexibly to predict the coal sample crushingFailure Mechanism of Gas-Bearing Coal during Outburst
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(PDF) Crushing properties of coal ResearchGate
It is known that coal preparation for burning or coking is an important link in a technological chain of an enterprise, and a coal crushing method influences greatly the product quality and outputThe preparation process of coal-like. Mechanical properties. Coal crushing during drilling requires the input of external energy, so a larger bulk density for per unit volume of coal results in more consumed energy, indicating that bulk density is an important index to measure the performance of materials. [26] It is an efficient method forExperimental study on the preparation method of coal-like
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Investigation on tectonically deformed coal particle crushing
Tectonically deformed coal is composed of loosely bonded and brittle particles. The effect of particle crushing on tectonically deformed coal was studied through triaxial loading tests using the discrete element method. Coal particles are highly sensitive to crushing under confining pressure.Zhang et al. [29] [30] [31] studied a new prediction method of coal-gas outburst based on the η parameter that was put forward on the basis of experimental study, and its dangerous level wasA new method for coal and gas outburst prediction and
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Pore Characteristics and Fractal Dimension Analysis of Tectonic Coal
Understanding the pore heterogeneity of tectonic coal and primary-structure coal is of great significance for predicting and preventing tectonic coal. This study adopts the low-temperature nitrogen adsorption method, mercury injection experiment, and other methods, combined with fractal theory, to quantitatively analyze the pore Literature [11] presented a method to identify coal and rock features by image recognition technology. On the basis of coal cutting theoretical research, the different forms of pick crushing coal and rock are analyzed, the layered rock mass model of coal seam with coal–rock interface is established, by using the crushing theory of coalCutting mechanical study of pick cutting coal seams with coal
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Frontiers Experimental Study on the Compaction and
The coal mining technology of fully mechanized solid filling is an efficient and green mining method that integrates “sediment reduction” and “emission reduction.” However, the discharge of wasted gangue and surface subsidence are controlled by the amount of wasted gangue used in filling mining and the compaction rate of gangue filled into a goaf, Selective crushing—This technology is a multistage coal preparation technology to control the degree of crushing of the different constituents of coal. By progressive crushing and screening, the harder particles which contain the high ash and more infusible components are selectively crushed finer to effect uniform dispersal of the Industrial perspective of the cokemaking technologies
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ISO/TS 21596:2021(en), Solid biofuels ? Determination of
The HGI test is an empirical batch method that simulates the continuous grinding and crushing operation of a ball, table or tube type of industrial coal pulverizer, herein also called coal mill. The HGI value is an indication of the degree of grinding required to reach a particular particle size necessary for effective combustion.Longwall mining is a highly productive, economical, and relatively safe method of coal mining. Academician Qian pointed out that as the longwall panel advances, the fractured irregular overlying rock masses and residual coal collectively form a porous medium called the gob area [1], which is illustrated in Fig. 1 (a). Inter-particle voids Experimental study on the secondary breakup properties of crushed coal
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