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 concentrated material for the procedures of extractive metallurgy.
The change rules of crushing ratio and newly added fine particle content with the cyclic loading times were similar. This is due to that the crushing forms of the gangue block in CGPM samples are mainly edges fracture and corners fracture. In this two crushing forms, gangue blocks in CGPM are mostly crushed into fine particles (0–10 mm).
the topic is original and it addresses the possibility of using crushed gangue in road engineering (via the study of water conditions influence on the crushed gangue). The obtained curves showing the influence of water content on crushed gangue under confining pressure are interesting for use as well was the relationship curves between …
The crushed coal gangue particles are widely used in solid backfilling. However, the nonuniform compaction and internal re-crushing behavior of crushed coal gangue under bearing stress have not yet been revealed in current research. But this is particularly significant for improving the filling effect and quality. In this article, with the aid of the …
Consequently, gangue waste piles have become one of the main sources of environmental pollution [8], [9]. To improve the mining environment and safety, gangue backfilling is widely applied [10], [11]. As a primary type of backfilling material, broken coal gangue is gradually compacted by overlying strata when backfilled into the mining goaf.
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 interaction model of the crushed gangue and the rock pillar in the gob during the bearing process was established, yielding the relationship between the deformation modulus of the two. This has ...
An interaction model of the crushed gangue and the rock pillar in the gob during the bearing process was established, yielding the relationship between the …
To analyse the influences of particle size of backfill materials on surface subsidence, the compaction properties of crushed gangue backfill materials (CGBM) with different particle sizes were tested by using the YAS5000 testing machine and a self-made compacting device. Moreover, based on the strain hardening behaviour of CGBM in the …
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 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 …
Crushed gangue models were made by gangue block containing single shape blocks or mixed-shape blocks. The influence of block shape on the macro deformation response and meso-fabric evolution of crushed gangue under triaxial compression was studied. The main conclusions are as follows: Li et al. (2020a) [1] the …
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 ...
J Li et al. [19] extracted the real shape of crushed gangue by CT scanning and analyzed the effect of particle gradation and shape on the natural accumulation voidage based on DEM; the results showed that the more irregular the shape of crushed gangue, the higher the voidage, and the continuous gradation could significantly decrease the ...
The permeability of crushed coal gangue follows a hierarchical distribution law and the permeability changes in the magnitude range of 10–11 ~ 10–9 m2. The fractal dimension is inversely related to the permeability of crushed coal gangue. The experimental results show that the coal gangue will be further crushed and that adding …
Crushed gangue models were made by gangue block containing single shape blocks or mixed-shape blocks. The influence of block shape on the macro deformation response and meso-fabric evolution of ...
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 …
The testing system (Fig. 1) comprises primarily a self-designed steel cylinder, an AE monitoring system (PCI-2 model, Physical Acoustic Corporation), and a microcomputer-controlled electro–hydraulic servo testing press.Crushed coal is enclosed in a self-designed steel cylinder. The charging height and internal diameters of the cylinder …
The explosion scene in gob was simplified and the position of the crushed gangue from the ignition source was set to 0.5 m, the actual setup is shown in Fig. 3.The gangue used in the experiments ...
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 the self-developed large-scale deformation-seepage test system of crushed rock. The effects of the rock lithology, axial stress, and …
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 ...
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 ...
The compaction and re-crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry.
Three stages of compressive deformation for crushed gangue is found. • The energy density of crushed gangue increases nonlinearly as the strain increases. • …
Appl. Sci. 2023, 13, 4538 3 of 15 This study conducted confined compaction tests on crushed gangue under different water conditions, analyzed the compaction deformation characteristics of the ...
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 ...
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 ...
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, …
This study reveals the internal mechanism of macro deformation of crushed gangue under the triaxial compression from the perspective of the mesoscopic fabric …
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 …