Experimental study on the mechanical characteristics of grouted coal ...
2023.5.20 To study the mechanical and damage characteristics of crushed coal after grouting, self-developed grouting equipment was used to reinforce coal with different
Charlar en LíneaExperimental study on the permeability of crushed coal medium
2021.11.29 Using the physical test method to determine the permeability of crushed coal grains, the permeability characteristics of the crushed coal medium can be studied,
Charlar en LíneaExperimental study on the secondary breakup properties of crushed coal ...
2022.2.1 The crushed coal was gradually compacted as a whole, and the secondary breakup phenomenon was relatively weak. Therefore, the aforementioned characteristics
Charlar en LíneaMicro-structure of crushed coal with different ... - ScienceDirect
2020.8.1 1. Introduction In China, spontaneous combustion coal seams account for more than 60% of the country’s mineable coal seams. Fires caused by coal spontaneous
Charlar en LíneaEffect of particle size on re-crushing characteristics of crushed coal ...
2022.7.1 A larger particle deforms more easily and results in more AE counts and energy under the same compression; 2) crushed coal exhibits layered re-crushing
Charlar en LíneaInvestigation on tectonically deformed coal particle crushing
2023.10.1 Crushed particles decrease porosity by filling the gaps between larger particles. After compaction, crushed particles form a crushing and compaction belt, which
Charlar en LíneaQuantitative analysis of layered re-crushing of crushed coal
2023.8.1 The crushed coal rock mass is compacted and re-crushed during the collapse and sinking of the overburden strata. This process changes the caved zone's
Charlar en LíneaMicro-structure of crushed coal with different ... - ScienceDirect
2020.8.1 Mechanical external forces (for example coal cutting by a shearer) lead to the crushing of coal, which causes the covalent bond rupture in the coal molecular
Charlar en LíneaStudy on mechanical properties of coal gangue and fly ash
2023.10.11 The permeability of crushed coal gangue follows a hierarchical distribution law and the permeability changes in the magnitude range of 10–11 ~ 10–9
Charlar en LíneaStudy on the distribution pattern of particle re
2022.1.18 The test results show that: the crushing of coal rock particles exists in almost the whole compaction process of the crushed coal rock body, and the crushing of coal rock particles has a non-negligible
Charlar en LíneaStudy on the distribution pattern of particle re-crushing
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
Charlar en LíneaContinuous method of cleaning a slurry of crushed raw coal
The fine clean coal line 110 which leaves with its contents from the coarse clean coal dryer 21 completes the first circuit of the fresh clean coal fines which is a continuous feed of fines charged to the fine clean coal slurry tank 23. ... This raw crushed coal is a separated refuse from an earlier washing operation and was regarded as having ...
Charlar en LíneaPhysico-chemical characteristics of pulverized coals and their ...
2021.11.26 Characteristics of pulverized coals have significant influence on the spontaneous combustion and explosion processes. This paper presents an experimental and theoretical framework on physico-chemical characteristics of coal and their interrelations from spontaneous combustion and explosion perspectives. The chemical properties,
Charlar en Línea(PDF) Study on the distribution pattern of particle re
2022.1.18 The test results show that: the crushing of coal rock particles exists in almost the whole compaction process of the crushed coal rock body, and the crushing of coal rock particles has a non ...
Charlar en LíneaSecondary oxidation of crushed coal based on free radicals
2021.4.15 Then, four straight lines perpendicular to the roof and floor were drawn from the top to the bottom of the coal seam surface of each sampling point. The distance between the straight lines is 0.1 m and the depth of the lines is 0.05 m. The fresh coal samples between the third and fourth straight-line areas were taken for analysis.
Charlar en LíneaContinuous method of cleaning a slurry of crushed raw coal
An inlet line deflector and equalizer means for a cyclone for washing crushed and sized coal with water wherein low density (1.6 or less) washed coal particles escape through the outlet pipe above the bottom collector through the box of the cyclone while higher density (1.7 or higher) siliceous impurities drain out of the cyclone bottom.
Charlar en LíneaInvestigating the effects of effective stress on pore
2021.12.23 The crushed coal particles used in this test were taken from Yanjiahe coal mine in Shaanxi province, and each block taken back was crushed, and four particle sizes were screened out using a vibrating sieve. 2) Preparation of gradation structure specimens. The crushed coal particles of different particle sizes were prepared according to the ...
Charlar en LíneaMicro-structure of crushed coal with different ... - ScienceDirect
2020.8.1 To explore the microstructure and oxidation reactivity of crushed coal, the free radicals and functional groups of coals with different ranks in the crushing process were analyzed based on electron paramagnetic resonance (EPR) and Fourier transform infrared (FTIR) spectrometry. The low-temperature oxidation of different-sized crushed coals was
Charlar en LíneaCompaction characteristics and energy dissipation of crushed
2023.6.5 The high-intensity development and utilization of coal resources have caused surface subsidence, roof hazards and solid waste accumulation, which has seriously influenced the high-quality coordinated development of the ecological environment and resource recovery in the mining area (Yang et al. 2021; Han et al. 2021).Backfill mining is
Charlar en LíneaExperimental Study on Confined Compaction Deformation of Crushed
2023.4.3 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 universal material testing machine and a compaction device. The strain–stress relationship in the compaction process of
Charlar en LíneaGases Free Full-Text Adsorption Factors in
2022.1.14 Line Spacing: Column Width: ... The crushed coal used for adsorption analyses is typically in the size range of 100–60 mesh [38,40,41,42] while bulk coal specimen are usually approximately 2 cm
Charlar en Línea(PDF) The correlation between crushed coal
2018.1.19 The correlation between crushed coal porosity and permeability under various methane pressure gradients: A case study using Jincheng anthracite ... Blue label lines ar e temperature-control pipelines.
Charlar en LíneaExperimental study on the mechanical characteristics of grouted coal ...
2023.5.20 To study the mechanical and damage characteristics of crushed coal after grouting, self-developed grouting equipment was used to reinforce coal with different particle sizes. A uniaxial compression test was carried out on the grouted specimens, and the acoustic emission (AE) and digital image correlation (DIC) techniques were used to
Charlar en LíneaMeasurement of the coefficient of seepage ... - ScienceDirect
2022.9.1 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
Charlar en LíneaExperimental Study on Spontaneous Combustion
2022.4.4 The spontaneous combustion of coal is affected by many factors, among which the influence of water is significant and complicated. To explore the influence of water on the spontaneous combustion characteristics of goaf residual coal, coal samples with similar particle size distributions to those of goaf residual coal were prepared. After the
Charlar en LíneaExperimental study on the secondary breakup properties of crushed coal ...
2022.2.1 The coal samples collected in the Yima coal field are of in-situ origin. The Yima coalfield is located on the axis of the Mianchi syncline. The structure is a simple monoclinic, and the formation is gentle. The coal is regarded as long-flame coal with low metamorphism and a high spontaneous combustion tendency. It facilitates. Results and
Charlar en LíneaSeepage properties of crushed coal particles - ScienceDirect
2016.10.1 The gas seepage properties of crushed coal specimens with five particle sizes of a (2.5–5 mm), b (5–10 mm), c (10–15 mm), d (15–20 mm) and e (mixed sizes) under the variable axial displacement of 10, 15, 20, 25, 30, 35, and 40 mm, respectively are measured by the revised MTS815.02 system. The results of test show that: The porosity ...
Charlar en LíneaEffect of Comminution Methods on Low-Rank Coal
2019.7.21 The floatability of fine low-rank coal particles can be greatly influenced by their morphological characteristics, such as shape and surface roughness. In this study, the attachment efficiency and detachment amplitude of fine low-rank coal particles produced by various comminution methods onto/from the bubble surface were investigated using
Charlar en LíneaOccurrence of Minerals in Coal and Its Geological
The precombustion washing and washability of coal are increasingly gaining attention as a clean coal technology in China. In this study, the raw coal was collected from different coal seams in the south of Qinshui Coalfield, and flotation experiments were carried out in the laboratory after simple crushing. X-ray diffraction was used for qualitative analysis of the
Charlar en LíneaSecondary oxidation of crushed coal based on free
2021.4.1 The secondary oxidation of active structures on the coal surface was studied by combining the theories of free radicals and functional groups. The coal oxidation reactivity was stronger in ...
Charlar en Línea