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 …

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 …

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.

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 resistance to deformation is … Expand

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

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 …

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 …

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 …

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 …

Yang Ke et al. 7 conducted compression tests on crushed gangue material with varying ... gangue in the gob and the evolution law of slip and rupture in the compaction process of crushed gangue. It ...

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 …

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 …

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 ...

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 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.

Figure 8 shows that the crushed gangue in the compression process is mainly manifested as a continuous reduction in the percentage content of large particles and the percentage content of small particles increasing. …

To study the long-term bearing characteristics of crushed gangue in goaf under water immersion conditions, ... To make the stress process of crushed rock more similar to that of caving gangue in the goaf, the loading rate is 0.5 kN/s and the test loads are 1.5 MPa, 3.5 MPa, 5.5 MPa, and 7.5 MPa, respectively. 2.5. Calculation Method of the ...

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 ...

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 …

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 ...

By observing the gangue compression process, we found that the crushed gangue shows a more uniform internal force chain distribution in the saturated state, with a higher number of cracks, crack growth rate and secondary crushing rate than those in the natural state. Under natural and saturated conditions, when the top void ratio of crushed ...

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.

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 …

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 …

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 …

This study investigates the deformation characteristics and energy consumption patterns of natural and saturated crushed gangue with large particle size during loading-constant load …

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.

In SBCM, the solid backfilling material, such as crushed gangue particle material (CGPM), loess, aeolian sand and coal ash are backfilled into the underground goaf to bear the overburden load and control the overburden movement. ... During the cyclic loading process of the compaction machine, particle crushing occurs in CGPM [2]. Particle ...

Under the action of axial load, the deformation of crushed gangue in the mining area mainly experiences the following three stages: The first stage is the initial compaction stage.