The deformation and re-crushing characteristics of different lithological caving crushed gangues in mine goaf directly affect the overburden strata movement, which significantly affects the surface subsidence of mining goaf. The effect of particle size on the re-crushing characteristics of different lithological caving crushed gangues in mine goaf is investigated in …
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 ...
A broken coal rock body is divided into two categories: the stacked-crushed coal rock body, such as the coal and gangue that emerged from the mining area, etc., the structure is looser and forms a natural stacking state [17,18] and the local-crushed coal rock body, such as the crushed structure of the coal column, the crushed structure of the ...
Optimizing aggregate grading and residual mortar coefficient in low-cement concrete by using crushed coal mine waste rock as base layers for low-traffic roads ... it is necessary to emphasize the importance of finding valuable solutions to reuse them. Mining and processing minerals can generate beneficial products but also produce unwanted by ...
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The acoustic emission activity is more frequent when the gangue with large particle size is crushed under compressive force. The loading process of gangue and slurry backfill can be divided into three stages: front, middle and back. The acoustic emission signal of backfill increases in the early and middle stages, and decreases in the later stages.
2.1 Materials. A large number of physical simulation experiments, numerical simulation experiments, on-site monitoring have shown that the particle size of the crushed gangue in the mining area from the caved zone to the curved subsidence zone is a combination of particle size distribution rather than a single particle size, and the overall trend is to increase; the lithology …
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Free particles of mineral and gangue – 6 out of 48 (1/8) ( and not 6 out of 24). ... distance apart of the roll faces at the point of their nearest approach.. Coefficient of friction Ft/Fn. Vertical component of Ft – Ft cos (a/2). ... SCALPING - to remove the coarsest size fractions in the feed material, usually so that they can be crushed ...
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crushed gangue processing coefficients. Gangue Crushing And Grinding Production Process crushed gangue processing coefficients ireactin crushing and grinding of magnesite, Utilization of coal gangue for the production of, More specifically it relates to a process for commercially drying processing gangue .
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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.
The curvature coefficients of gradations 3 and 4 were significantly smaller than those of gradations 1 and 2, which were 1.09 and 0.92, respectively. ... (limestone) can be preferentially broken and decomposed during the compression process to enhance the compaction of crushed stone aggregate. ... ultrasonic and stress of cemented waste rock ...
Experimental Investigation on the Grading Optimization and Storage Effect of Crushed Gangue for Backfill. Kai Sun, Lei Zhu, Jian Li, Shanjun Tian, Zhiqiang Yang, Zhicheng Liu, and 1 more ... the porosity of gangue crushing and the process of gangue crushing are analyzed. It is shown that the gangue material has good load-bearing performance in ...