In this research, the deformation, particle crushing, and morphology evolution of saturated crushed gangue under variable axial stresses (0, 2, 4, 8, 12, 16, and 20 MPa) were …
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Coal gangue power generation Coal gangue grinding adopts fluidized bed technology. When the carbon content is greater than 20%, it can be used as energy and can be used to generate electricity. Recycling of coal and pyrite Coal gangue adopts composite dry coal preparation, cyclone, and heavy medium separation. When the coal content exceeds 20%, …
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dination structure of crushed gangue materials is inuenced and the occlusive eect, intercalation and stress concentra-tion of gangue blocks are signicantly changed during the loading and compression. Furthermore, the overall engineer - ing mechanical properties of crushed gangue materials are affected. At present, scholars at home and abroad ...
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The main reasons for the compression of saturated crushed gangue were as follows: (1) Under the action of the axial loading, gangue particles overcame the frictional resistance between particles. This resulted in sliding and rolling to a more stable position; hence, it led to a reduction in the void volume. (2) Gangue particles were broken.
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Coal mining causes serious ecological and environmental damage. The crushed gangue is backfilled into underground goaf, which not only inhibits mining-induced subsidence but also reduces accumulation of waste on the ground: however, the effects of backfilling with gangue backfill materials in goaf are affected by a combination of multiple factors. To predict …
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The impacting crusher was used to impact crushing test on coal and gangue from three mining with different impact velocity.The distribution function of coal and gangue,the influence of the impact velocity and the hardness of coal and gangue on the distribution function were got from the data fitting of experimental results.The results show that:Weibull distribution can descript …
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The particle size gradation of the two gangue specimens exhibited fractal characteristics after manual crushed, and the fractal dimension of each crushed specimen ranged from 0.352 to 2.654. (2) Regarding sandstone and sandy mudstone, the fractal dimension D of specimens with particle sizes from 20 to 31.5 mm and 31.5 to 50 mm rose quickly at ...
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The surface morphology of compacted and crushed gangue presents self-similarity and other fractal characteristics. This research constructed a fractal model for the particle size of compacted and crushed gangue based on fractal theory and particle size distribution information. To investigate the fractal characteristics of compacted gangue, compaction experiments were …
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The crushed gangue materials which are filled into the goaf in solid-backfilling coal mining become the main body of bearing the overburden after the tamping process. Its …
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mineral processing, art of treating crude ores and mineral products in order to separate the valuable minerals from the waste rock, or gangue. It is the first process that most ores undergo after mining in order to provide a more …
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purposes (Clarence H. Lorig, March 2017) (DRZYMALA, 2007). ... being crushed into intermediate size from its originally huge size. ... agglomeration surrounded by waste and gangue mineral ...
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After stage II, the permeability of crushed gangue decreases to the magnitude of 10 − 15 m 2, while the impermeability increases; 5) the non-Darcy β factor is negative for gangues with size larger than 10 mm, while that gradually becomes positive with porosity decrease for mixed gangues and gangues with size less than 10 mm.
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The main purpose is to stabilize the overlying strata and reduce surface subsidence in the process of recovering coal reserves that are located under buildings, railways, and water bodies, thus reducing piled gangue on the surface and the environmental pollution. ... whose lithology is sandstone. The gangue was first crushed by a crusher and ...
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Crushed gangue can be used as a backfilling material for underground mining goaf backfilling in order to control strata movement and mining subsidence. ... the charge amount on the deformation behaviour of crushed gangue will be further investigated in future work with the purpose of providing the theoretical basis for underground crushed ...
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Coal gangue is a fixed coal mining, washing, and processing product. It is a black-gray rock with lower carbon content and harder than coal associated with coal seams during the coal formation process. And its …
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Coal gangue piles accumulate outside mines and can persist for years, negatively impacting the regional environment. To determine the main cause of soil pollution at coal gangues, several coal ...
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The crushed coal gangue particles are widely used in solid backfilling. However, the non-uniform compaction and internal re-crushing behavior of crushed coal gangue under bearing-stress have not ...
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The gangues in mine goaf have two characteristics: (1) the particle size of the gangue increases from bottom to top, and it is not a single particle size distribution, but a …
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The crushed gangue continues to fill the surrounding small voids, resulting in a further increase in gangue density and a gradual reduction in the magnitude of gangue compression deformation. The ...
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The following conclusions were obtained, (1) the axial displacement increment and fractal dimension of the graded crushed gangue are closely related to the graded structure of the skeletal ...
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DOI: 10.1016/J.POWTEC.2016.09.049 Corpus ID: 99219669; Fractal characteristics of crushed particles of coal gangue under compaction @article{Zhang2017FractalCO, title={Fractal characteristics of crushed particles of coal gangue under compaction}, author={Jixiong Zhang and Meng Li and Zhan Liu and Nan Zhou}, journal={Powder Technology}, year={2017}, …
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In order to solve the problem of the high cost of coal-based solid waste bulk stacking and paste filling in the large-scale coal electrification base in East NingXia, in this study, fly ash is skillfully used to replace the broken coal gangue as the mixed filling material. As using a jaw crusher for crushing large coal gangue is expensive, and its energy consumption is …
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The crushed gangue will be displaced laterally in the process of being compacted, and the wall of the cylinder will be subjected to a certain amount of lateral pressure due to the presence of the ...
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Based on the analysis of the crushed gangue deformation at different water filling stages, the effects of cumulative crushing in the upper layer and concentrated filling in the lower layer can be observed, as shown in Figs. 9 (b) and 11. Due to the decrease in stress exerted by the loading head on the crushed gangue with increasing depth, the ...
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To study the long-term bearing characteristics of crushed gangue in goaf under water immersion conditions, the creep test of the crushed gangue in the water immersion state was performed by using ...
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It is typically in powdered form after the ore is crushed. 2. Role of Flux : - A flux is a substance that is added to the gangue during the metallurgical process. ... Its primary purpose is to react with the gangue to help separate the desired metal from the impurities. 3. Formation of Fusible Material : - When flux is added to the gangue, it ...
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The coal industry is an important pillar industry of economic development in China, with coal mining produced a lot of coal gangue, which is occupied land, and pollution of the environment, and the production and life of coal-producing areas have been seriously affected, coal gangue has become a heavy burden restricting the sustainable development of coal …
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For this purpose, a total of 30 concrete mixtures were designed by the inclusion of 0%, 25%, 50%, 75% and coal gangue as coarse aggregates and 0%, 10% and 20% metakaolin as binder at 0.55 and ...
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In recent years, solid waste backfill mining has developed rapidly and widely used to control surface subsidence and reduce accumulation of solid waste. As crushed materials are used to backfill goafs, the particle size of backfill materials becomes a key factor influencing the control of surface subsidence. To analyse the influences of particle size of backfill materials on …
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The purpose of desliming is to dissociate and disperse the fine slime mixed in and attached to coarse ore grains and the agglomeration of fine slime, so as to remove the slime. ... magnetic dewatering tank is used to remove the fine gangue grains, which is important for improving the technical indicators of production of beneficiation plant ...
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