the proportion of s broken coal gangue

Study on Proportioning Test of Coal Solid Waste Paste ...

In order to excavate coal resourses which is under buildings, water bodies, railways and above confined water, a complete technology of new pumping paste comprehensive mechanization mining technique which is safety, high efficiency, high mining rate and environmental protection has been formed, the study on filling material is very important.Properties and Hydration Mechanism of Autoclaved …A new type of autoclaved aerated concrete (ACC) was prepared using coal waste as the main raw materials. The calcination temperatures of coal cangue (CG), effect of calcined coal gangue (CCG) content on properties of AAC, and the variation of hydration products and microstructure of ACC under curing conditions were analyzed using X-ray diffraction (XRD), and scanning …

(PDF) Compression characteristics of filling gangue and ...

large gangue i s broken, the filling effect ca n be improved if the Talbot distribution of n =0.5 is ensured for the gradation of filling gangue after crushing in engineering applic ation.Pozzolanic behaviour of compound-activated red mud …The total accumulative stockpiles of coal gangue in China have already reached 4.5 billion tons, and the disposal of such a large amount of coal gangue occupies a …

Arch structure effect of the coal gangue flow of the fully ...

Based on the characteristics of the top coal thickness of the fully mechanized caving in special thick coal seam, the long distance of coal gangue caving, as well as the different sizes of the coal gangue broken fragment dimension and spatial variation of drop flow, this paper uses laboratory dispersion simulation experiment and theoretical analysis to study the arch structure effect and …Emission characteristics of volatile organic compounds ...2016-10-1 · Coal-, coal gangue- and biomass-fired power plant, were chosen to survey the source profile and emission factor of VOCs. • B/T ratios (0.8–2.6) during thermal power generation could be consider as the characteristics of coal and biomass burning.

TheEffectofAcidMineDrainageCorrosionontheCreep ...

2020-10-20 · Table 2: Mineralogical composition of coal gangue. Minerals Proportion (%) Siltite 8.5 Medium-grained sandstone 42.7 Fine-grained sandstone 13.6 Sandy mudstone 19.5 Coal 2.1 Carbonaceous mudstone 4.7 Arenaceous shale 3.0 Table 3: Main parameters of coal gangue. Parameters Value Mt 0.5% Mad 0.21% Aad 88.12% Vad 76.64% Fixed carbon 2.78% Total ...Microstructure of Coal Gangue and Precipitation of Heavy ...2017-1-1 · The gangue mined out from the well was used as the fresh coal gangue and that on the surface of the gangue hill was used as the weathered coal gangue. The "snake sampling method" was used to determine 20 sampling points, after mixing the samples of each sample point, sampling through the "cone quartering" method, and then repeating these steps ...

Strain softening and brittleness characteristics of gangue ...

The results show that coal gangue powder reduces the crack area ratio of expansive soil by 48.9%, and the crack initiation time is delayed by at least 60 …The Impact Behavior between Coal Gangue Particles and …2021-11-23 · In top coal caving mining, common impact occurs between coal gangue particles and tail beam. Little attention has been paid to the effects of coal gangue particles failure on impact force and tail beam response theoretically, numerically, and experimentally. This paper aims to reveal the influence of coal gangue particles failure on the impact effect of tail beam.

Impact-Crush Separation Characteristics of Coal and …

2022-1-22 · Utilizing the difference in hardness, coal and gangue can be separated by the impact-crush technology for utilization underground. The influence of …Evaluation for the Leaching of Cr from Coal Gangue Using ...2019-7-24 · Coal gangue can cause significant heavy metal pollution in mining areas, which would have a negative impact on the environment and human health. The objective of this research is to investigate the relationship between expansive soil amount and the leaching behavior of Chromium from coal gangue and the engineering properties of coal gangue used as building …

Pore pressure evolution and mass loss of broken gangue

2018-11-20 · The gangue was taken from about 2325 m strata, in Xiaojiawa coal mine in Shanxi province of People''s Republic of China. Table 1. Nomenclature. list of symbols d diameter of broken gangue h 0 initial height of the broken gangue sample H height of the broken gangue sample H 1 cylinder tube height (H 1) HPore pressure evolution and mass loss of broken gangue .. oken gangue consists of different particles, and it has more complicated seepage characteristics than intact rock sample. Using the self-designed instrument, the permeability, mass loss and pore pressure of crushed gangue during the seepage are tested. The result shows that permeability parameter …

Pore pressure evolution and mass loss of broken gangue ...

2018-10-10 · where m, ρ s and h 0 are the mass, mass density and the initial height of the broken gangue sample, respectively, Q is the cross-section area of the cylinder tube, and S is an axial displacement. The testing fluid was water with density ρ w = 1.0 × 10 3 kg m −3 and kinetic viscosity μ = 1.01 × 10 −3 Pa s at the standard state.Effects of particle sizes on compressive deformation and ...2020-1-15 · Broken gangue from the collapsing roof of a longwall coal panel can be used as the backfilling material for goaf backfilling. The particle size gradation has important influence on the compressive deformation of the gangue backfilling material and particle breakage.

Pore pressure evolution and mass loss of broken gangue ...

2018-10-10 · where m, ρ s and h 0 are the mass, mass density and the initial height of the broken gangue sample, respectively, Q is the cross-section area of the cylinder tube, and S is an axial displacement. The testing fluid was water with density ρ w = 1.0 × 10 3 kg m −3 and kinetic viscosity μ = 1.01 × 10 −3 Pa s at the standard state.Pore pressure evolution and mass loss of broken gangue ...2018-10-10 · where m, ρ s and h 0 are the mass, mass density and the initial height of the broken gangue sample, respectively, Q is the cross-section area of the cylinder tube, and S is an axial displacement. The testing fluid was water with …

Assessment of heavy metal in coal gangue: distribution ...

2018-9-18 · Dang Z, Fowler M, Watts S et al (1998) Geochemical behavior of heavy metal in coal gangue natural weathering process. Prog Nat Sci 8:314–318. Google Scholar Deng J, Li B, Xiao Y, Ma L, Wang CP, Lai-wang B, Shu CM (2017) Combustion properties of coal gangue using thermogravimetry-Fourier transform infrared spectroscopy eakage law and fractal characteristics of broken coal ...2019-3-25 · Broken coal and rock masses are the major part of the goaf. The compaction characteristics of coal and rock masses and the breakage law of whose particles during compaction exert an important influence on various aspects including control of strata motion, prediction of surface subsidence, and backfill mining.

Pore pressure evolution and mass loss of broken gangue ...

2018-10-10 · where m, ρ s and h 0 are the mass, mass density and the initial height of the broken gangue sample, respectively, Q is the cross-section area of the cylinder tube, and S is an axial displacement. The testing fluid was water with …Microstructure of Coal Gangue and Precipitation of Heavy ...2017-1-1 · The gangue mined out from the well was used as the fresh coal gangue and that on the surface of the gangue hill was used as the weathered coal gangue. The "snake sampling method" was used to determine 20 sampling points, after mixing the samples of each sample point, sampling through the "cone quartering" method, and then repeating these steps ...

Influence of lignin on coal gangue pyrolysis and gas ...

The influence mechanism of lignin on coal gangue pyrolysis has not been studied in the literature, so this article is helpful to clarify the influence mechanism of biomass components on coal gangue. The research of coal gangue pyrolysis technology has a positive effect on reducing the amount of solid waste and reducing the harm to the environment.The Impact Behavior between Coal Gangue Particles and …2021-11-23 · In top coal caving mining, common impact occurs between coal gangue particles and tail beam. Little attention has been paid to the effects of coal gangue particles failure on impact force and tail beam response theoretically, numerically, and experimentally. This paper aims to reveal the influence of coal gangue particles failure on the impact effect of tail beam.

Study on dynamic adsorption characteristics of broken …

2021-12-20 · It is found that the broken gangue with a particle size of less than 15 mm can adsorb heavy metal ions in mine water of an underground reservoir in the coal mine . Therefore, when the influence of gradation was considered, four kinds of gangue gradation were set, including the single gradation of 1–5 mm, 5–10 mm, 10–15 mm and the equal .. eld study on the improvement of coal gangue filling ...2021-5-5 · The coal gangue contains fine particles with a particle size less than 4.75mm, coarse particles larger than 4.75mm. k w is the coal gangue fine-rough grain ratio. The coal gangue fine-rough ratios after DC are 0.4032, 0.4616, and 0.5038 for tamping energies of 2000, 2500, and 3000kN.m, respectively.

Evaluation of Mechanical Properties and Microscopic ...

2019-9-30 · 1. Introduction. The large-scale development of coal resources in China has produced a large amount of solid waste such as coal gangue in the process of coal production, which resulted in fearful detriment to coal mining and the surrounding areas [1,2,3] was reported that the amount of coal gangue accumulated in China has reached 4.5 billion tons, occupying more …Field study on the improvement of coal gangue filling ...2021-5-5 · Europe PMC is an archive of life sciences journal literature.

Impact-Crush Separation Characteristics of Coal and …

2022-1-22 · Utilizing the difference in hardness, coal and gangue can be separated by the impact-crush technology for utilization underground. The influence of …Evaluating the distribution and potential ecological risks ...2020-10-15 · Coal plays a dominant role (70%) in energy consumption of China (Huang et al. 2017).A large amount of solid waste-coal gangue would be produced in processing and accounts for 10–15% of the raw coal, approximately (Li and Wang 2019).Currently, the cumulative amount of coal gangue is estimated to be more than 5.0 billion tons given the large production of coal …

(PDF) Compression characteristics of filling gangue and ...

large gangue i s broken, the filling effect ca n be improved if the Talbot distribution of n =0.5 is ensured for the gradation of filling gangue after crushing in engineering applic ation.Sludge amendment accelerating ... - Scientific Reports2021-2-3 · Coal gangue and fly ash hardly contained water, and the water content of sludge was 60%. The characteristics of the reconstructed substrates can be found in Qian et al. 15 .

Breakage law and fractal characteristics of broken coal ...

2019-3-25 · Broken coal and rock masses are the major part of the goaf. The compaction characteristics of coal and rock masses and the breakage law of whose particles during compaction exert an important influence on various aspects including control of strata motion, prediction of surface subsidence, and backfill mining.Assessment of heavy metal in coal gangue: distribution ...2018-9-18 · Dang Z, Fowler M, Watts S et al (1998) Geochemical behavior of heavy metal in coal gangue natural weathering process. Prog Nat Sci 8:314–318. Google Scholar Deng J, Li B, Xiao Y, Ma L, Wang CP, Lai-wang B, Shu CM (2017) Combustion properties of coal gangue using thermogravimetry-Fourier transform infrared spectroscopy.

Assessment of heavy metal in coal gangue: distribution ...

2018-9-18 · Dang Z, Fowler M, Watts S et al (1998) Geochemical behavior of heavy metal in coal gangue natural weathering process. Prog Nat Sci 8:314–318. Google Scholar Deng J, Li B, Xiao Y, Ma L, Wang CP, Lai-wang B, Shu CM (2017) Combustion properties of coal gangue using thermogravimetry-Fourier transform infrared spectroscopy.(PDF) Compression characteristics of filling gangue and ...large gangue i s broken, the filling effect ca n be improved if the Talbot distribution of n =0.5 is ensured for the gradation of filling gangue after crushing in engineering applic ation.

Sludge amendment accelerating ...

2021-2-3 · Coal gangue and fly ash hardly contained water, and the water content of sludge was 60%. The characteristics of the reconstructed substrates can be found in Qian et al. 15 .Improvement of Low‐Rank Coal Flotation Based on the ...2021-1-10 · However, in the raw coal, the surfactants could be removed from gangue surface under ultrasonic and Ca 2+ because of the low proportion of gangue in raw coal and weaker adsorption strength of Ca 2+ on gangue, as indicated by the ash reduction. Wetting heat results suggested that wettability difference between organic matter and gangue was ...

Pore pressure evolution and mass loss of broken gangue

2018-11-20 · The gangue was taken from about 2325 m strata, in Xiaojiawa coal mine in Shanxi province of People''s Republic of China. Table 1. Nomenclature. list of symbols d diameter of broken gangue h 0 initial height of the broken gangue sample H height of the broken gangue sample H 1 cylinder tube height (H 1) HMechanism on Activation of Coal Gangue Admixture2021-9-28 · Coal gangue, an industrial waste, is rich in silicon and aluminum phase and may be used as a mineral admixture in concrete after moderately stimulating activity, allowing for efficient solid waste utilization. This study used a mortar strength and activity evaluation method to investigate single or compound activation methods to find the optimum activation method of …

Pore pressure evolution and mass loss of broken gangue ...

2018-10-10 · where m, ρ s and h 0 are the mass, mass density and the initial height of the broken gangue sample, respectively, Q is the cross-section area of the cylinder tube, and S is an axial displacement. The testing fluid was water with density ρ w = 1.0 × 10 3 kg m −3 and kinetic viscosity μ = 1.01 × 10 −3 Pa s at the standard state.Pore pressure evolution and mass loss of broken gangue .. oken gangue consists of different particles, and it has more complicated seepage characteristics than intact rock sample. Using the self-designed instrument, the permeability, mass loss and pore pressure of crushed gangue during the seepage are tested. The result shows that permeability parameter …

Experimental Study on Compression Characteristics of ...

2020-4-18 · When gangue is used for downhole filling, the gangue is first processed into broken gangue with different particle sizes. According to the actual situation on site, This paper uses five kinds of particles ranges of 0–20 mm, 0–30 mm, 0–40 mm, 0–50 mm and 0–60 mm, respectively pression characteristics of local filling gangue in …2022-2-2 · Coal gangue is widely used as a filling material in coal seam mining. During the gangue filling in steeply dipping coal seam, the loading rate, gangue gradation, and filling speed have an important impact on the deformation and failure of gangue, and further affect the bearing of gangue on overlying strata and the control of surrounding rock movement and deformation.

Influence of Coal Gangue Volume Mixing Ratio on the …

2020-5-29 · Abstract: In order to clearly grasp the influence rules of the coal gangue volume mixture ratio on the system contact response, and finally realize the coal gangue mixing ratio recognition according to the contact response differences, on the basis of the Hertz contact theory and Flores nonlinear spring-damping contact theory, this paper proposed and established the …Evaluating the distribution and potential ... - PubMedThe heavy metals, which derived from accumulated coal gangue, are important source of environmental pollution. In this study, coal gangue dumps, collected in Shaanxi Province, China, were used to evaluate the potential ecological risks and release characteristics of heavy metals, including the chemical forms, release characteristics, and potential ecological risks by using …