The crushed gangue has a looser structure and more void space between the blocks before it is strained (Fig 9a). (2) The internal block of the crushed gangue produces large deformation during the process of rapid compaction, and this deformation primarily accounts for the overall deformation.
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The stress–strain relationship of crushed gangue in the compaction process increases exponentially and can be divided into void compaction stage, structure adjustment stage and elastoplastic ...
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This process changes the caved zone's physical-mechanical properties and seepage characteristics, further affecting the migration and distribution of water and gas [[13], [14], [15]]. ... and studied the influence of block shape on the macro deformation response and meso-fabric evolution of crushed gangue under triaxial compression.
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The research process includes CT scanning test of the external contour of the randomly selected gangue block, reconstruction of 3D model of real shape of gangue block, acquisition and classification of 3D shape parameters of gangue block, construction of particle flow numerical model of crushed gangue with different block shapes under the triaxial …
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The crushed particle size came from the complete caved zone gangue in the longwall goaf of a mine. The maximum thickness of the caved zone was about 20 m, and the
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Abstract: In solid backfilling coal mining (SBCM), the crushed gangue backfilling material (CGBM) is generally compacted circularly by a compaction machine in order to reduce its compressibility. In this cyclic compaction process, the particles are crushed, which has a significant effect on the deformation resistance of CGBM.
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This study investigates the deformation characteristics and energy consumption patterns of natural and saturated crushed gangue with large particle size during loading-constant load …
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Obviously, as the crushed gangue being compacted constantly, the seepage velocity will reduce and the pressure of the relief valve will increase correspondingly. ... During the compaction process, the crushed gangues experience constant fragmentation, reconstruction and compaction. Those with larger diameter have much wider diameter ...
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The results show that the confined compaction deformation process of crushed gangue can be divided into three stages: the rapid compaction stage, crushing compaction stage, and stable compaction stage. The strain–stress …
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where d is the particle size of the broken coal gangue, mm; D is the largest particle size of the broken gangue, mm; M d is the mass of broken gangue in the rock sample with a particle size smaller than or equal to d, g; M t is the total mass of broken gangue in the sample, g; and n is the Talbol power exponent. 2.2 Test procedure The above crushed rock mass compaction system …
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Particle flow simulation of broken gangue backfill materials can be used to effectively study the bearing-compression characteristics of gangue backfill materials. The 3D reconstruction of the digital model for the real shape of the irregular gangue blocks is crucial for the numerical simulation of particle flow to accurately express the spatial and temporal …
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The coal gangue was taken from Xin'an Coal Mine in Luoyang, Henan Province. The lithology of the gangue was sandstone, and the average density of the gangue was 1.369 × 10 3 kg/m 3, with an average uniaxial compressive strength of 38.03 MPa.To reduce the impact of boundary effects on the results (He et al., 2022), the larger gangue particles were crushed …
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This study reveals the internal mechanism of macro deformation of crushed gangue under the triaxial compression from the perspective of the mesoscopic fabric evolution. The …
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Free particles of mineral and gangue – 6 out of 48 (1/8) ( and not 6 out of 24). Degree of liberation of each constituent- 3 out of 24 (1/8). 6 7. MINERALS OF ... usually so that they can be crushed or removed from the process; (c) GRADING - to prepare a number of products within specified size ranges. This is important in quarrying and iron ...
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CGC production process: 1 Coal gangue is crushed by a jaw crusher and ground by a ball mill. Raw materials are screened using a 100-mesh vibrating screen. ... The crushed gangue is ground into powder and sent to be …
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Iron processing - Ores, Smelting, Refining: Iron ores occur in igneous, metamorphic (transformed), or sedimentary rocks in a variety of geologic environments. Most are sedimentary, but many have been changed by weathering, and so their precise origin is difficult to determine. The most widely distributed iron-bearing minerals are oxides, and iron ores consist mainly of …
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Introduction. In the process of coal mining, the discharge of crushed gangue accounts for 15–20% of coal output. At present, the crushed gangue accumulated on the ground of mining areas in China has exceeded 6 billion tons, becoming the largest industrial solid waste in China 1 – 3.The accumulation of crushed gangue on the ground causes a series of …
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We designed a crushed rock compaction permeation apparatus and a seepage circuit. We test the permeability of crushed gangues with six different particle sizes. We …
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The utility model discloses a crushing device for processing coal gangue matrix, which belongs to the technical field of coal gangue processing and comprises a main body component, wherein an inlet is arranged on one side of the main body component, a cleaning device is arranged at the bottom of the main body component, and a sealing device is arranged on one side of the main …
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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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The sampled large gangue was crushed to a block size of 1–2 cm by a jaw crusher, then a rock crusher was used to further crush the 1–2 cm gangue fragments, and the discharge …
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Schematic Diagram of Creep Compaction Process of Crushed Gangue Samples with Different Lithology. Citations (0) References (27) ...
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To study the deformation characteristics of crushed gangue under different water content conditions, the confined compaction test of crushed gangue was carried out under five different water content conditions by using a …
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Graded crushed gangue, in the compaction process, will be accompanied by the. re-crushing of the particles, and the re-crushing of the particles will, in turn, affect its.
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The effect of particle size on the re-crushing characteristics of different lithological caving crushed gangues in mine goaf is investigated in this study based on an innovative compression–AE (acoustic emission) measuring …
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1. Introduction. After coal mining, many mined-out spaces are formed underground, which causes strata movement, damage, surface subsidence, and collapse [1 – 5].Simultaneously, a large quantity of solid wastes such as gangue is discharged in the coal mining process [6 – 10].Gangue discharge and surface subsidence control are common …
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In the process of coal mining, the discharge of crushed gangue accounts for 15%~20% of coal output. At present, the crushed gangue accumulated on the ground of mining areas in China has exceeded 6 billion tons, becoming the largest industrial solid waste in China 1–3.The accumulation of crushed gangue on the ground causes a series of environmental …
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The stress–strain relationship of crushed gangue in the compaction process increases exponentially and can be divided into void compaction stage, structure adjustment stage and elastoplastic ...
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Crushed gangue, an inhomogeneous and discontinuous medium, is accompanied with the absorption and dissipation of energy under compression. In order to study the compressive deformation and energy dissipation of gangue in the loading process under conditions of different particle sizes, loading rates, and first-time stress loads, a SANS testing …
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In solid backfilling coal mining (SBCM), the crushed gangue backfilling material (CGBM) is generally compacted circularly by a compaction machine in order to reduce its compressibility. In this cyclic compaction process, the particles are crushed, which has a significant effect on the deformation resistance of CGBM. However, the deformation resistance …
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