Study on Solidification Characteristics of Granular Coal Gangue…
Three groups of filling materials with different mix proportions were prepared. PO42.5 grade cement was selected as the binding material, mechanized granular coal gangue and fine sand were used as the filling aggregate, and then the specimens were curing at room temperature and 95% moisture. Through the uniaxial compression …
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The influence of fly ash content on ITZ microstructure of coal gangue
It is gradually applied that coal gangue concrete (CGC) prepared by replacing crushed stone with coal gangue in a certain proportion. Further, adding fly ash (FA) to CGC improves not only the ...
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Preparation of high closed porosity ed ceramics …
This study proposes a new strategy to prepare high closed porosity ed ceramic with coal gangue waste as the major material. The chemical composition and …
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Radiation characteristics of natural gamma-ray from coal and gangue …
Coal-gangue recognition is a bottleneck technology to realize the automation of fully mechanized top coal caving. At present, a large number of scholars have studied it in different ways, but the real-time performance and the veracity of recognition are still to be further ascension. ... grit stone, medium sand, fine sandstone, siltstone, silty ...
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Study of Mechanical Properties and Durability of Alkali-Activated Coal
Coal gangue, which has a similar composition to clay, ... Figure 11 a,b presents the failure modes of coal gangue aggregates concrete and crushed stone aggregates concrete, respectively, (ITZ is the interface transition zone). As per the analysis of the damage mode, the damage in coal gangue concrete was similar to OPC. ...
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Influence of coal gangue mulching with various thicknesses …
Coal gangue, as a type of solid waste discharged during coal mining and coal washing, ... Guo TL, Wang QJ, Li DQ, Zhuang J. Effect of surface stone cover on sediment and solute transport on the slope of fallow land in the semi-arid loess region of northwestern China. J. Soils Sediments. 2010; 10 (6):1200–1208. doi: 10.1007/s11368-010 …
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Residual deformation of coal gangue subgrade filler …
This test focuses on the residual deformation of coal gangue subgrade filling under dynamic conditions. At the same time, as a subgrade filler, considering dynamic …
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Field study on the improvement of coal gangue …
The coal gangue filling bearing capacity and anti-deformation ability increase with increasing tamping energy. The coal gangue filling bearing capacity reached at …
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Pyrolysis behavior of corncob and coal gangue with modified medical
In China, the coal gangue reserves are about 6 billion tons, and it is increasing at a rate of 300 to 700 million tons every year. In addition, more than 1600 gangue hills have spontaneously ...
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Experimental study of microorganism-induced calcium …
The treatment of coal gangue solid waste and microbially induced calcium carbonate precipitation (MICP) consolidate technology is a focus of research at home and abroad. MICP technology was used to solidify and cement coal gangue particles and endows them with a certain strength. The process does not use the traditional …
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Comprehensive Extraction of Silica and Alumina from High-Alumina Coal
The International Energy Agency reported that the energy used in the world for electricity generation is still mainly from coal fuel [].Coal gangue, which is generated during coal mining and washing, is one of the largest industrial waste products with an output of 10 − 15% of the total coal production [2, 3].The coal production worldwide in …
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Effect and mechanism of coal gangue concrete
Obviously, coal gangue concrete (CGC) made by using coal gangue as coarse aggregate to replace a part of gravel is simpler and more economical, with stronger feasibility and practicability [7]. However, a coal gangue aggregate has a looser structure than ordinary crushed stone, with more flake particles and pores; consequently, its …
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On-Site Measurement on Compaction Characteristics of Coal Gangue …
Gangue is the main backfilling material in solid backfilling mining, and its compaction characteristics determine the overburden control effect and surface subsidence. Under the action of compaction force and overburden pressure, the gangue will be broken, rotated and occluded, resulting in different compaction characteristics of gangue in the …
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Study on compressive strength and durability of alkali-activated coal
In this paper, the coal gangue is a black-gray clay rock coal gangue, the mineral crystal phase in the coal gangue is largely decomposed into SiO 2 and Al 2 O 3 components with pozzolanic activity after calcining at 700 °C high temperature [27]. The slag is S95 grade granulated blast furnace slag of Hebei Iron and Steel Company.
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Deformation and Fracture Characteristics of Coal Gangue
The dynamic sedation of the coal mine production is alternate or superimposed in coal rocks, which causes crack unevenness due to the presence of jacquards, causing unregistered coal blocks. By observing the deformation and fracture characteristics of coal-rock interbedding specimens with different gangue ratio under …
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The Sustainable Utilization of Coal Gangue in
Among the coal mining-related wastes, coal gangue (CG) is the heterogeneous waste generated during the mineral processing or coal washing phase of …
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Field study on the improvement of coal gangue filling using …
Large pieces of coal gangue were selected to fill the pond until the fill height was at the surface of the water. Ordinary coal gangue was used to fill the pond with a bulldozer until the height reached the design elevation + 1.0 m (1.0 m for the expected settlement). The coal gangue was rolling compacted during the filling process (Fig 2).
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Heavy Metal Concentrations of Soil, Rock, and Coal …
Limestone ranked second when considering the sum value (3.84), followed by mudstone (2.86) > shale (2.56) > coal gangue (2.19) > sandstone (1.86) > granite (1.61) > diorite (1.21). The normalized values …
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The Sustainable Utilization of Coal Gangue in
The results show that (1) it is feasible that employing coal gangue to replace natural coarse and fine aggregates in concrete can prepare C30 and C40 concrete; (2) the addition of coal gangue fine ...
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(PDF) Field study on the improvement of coal gangue filling …
paction grouting in completely decomposed granite of Hong Kong, Construction and Building Materials. 23(3), 1249–1264. ... Coal gangue is one of the largest industrial solid waste all over the ...
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Sustainability | Free Full-Text | Coal Mine Solid Waste Backfill …
Coal mine solid waste backfill is a coal mining method employed to safeguard subterranean and surface geological formations, as well as water resources, against impairment. It stands as a pivotal technical approach for realizing ecologically sustainable mining endeavors, aiming to address China's predicament of 'three down' coal pressure, …
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Coal and Gangue Classification Based on Laser-Induced …
During the extraction and processing of coal, a large amount of solid waste, collectively known as gangue, is produced. This gangue has a low carbon content but a high ash content, accounting for approximately 15 to 20% of the total coal yield. Before coal is used, coal and gangue must be effectively separated to reduce the gangue content in …
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(PDF) Mechanical Properties of Gangue Cement Stabilized
In this study, coal gangue was used to replace the four single-graded natural gravels of 0~5 mm, 5~10 mm, 10~20 mm, and 20~26.5 mm to design the mix ratio and to study the influence in particle ...
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Image feature extraction and recognition model construction of coal …
The five different illuminance involved in this experiment were 3790, 11,310, 17,130, 23,500 and 31,070 Lux, respectively. A total of 1800 coal and gangue images after graying were obtained in the ...
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(PDF) Preparation of a Gangue-Based X-type Zeolite
The coal gangue was crushed, ball-milled, and then passed through 100 mesh sieves to obtain coal gangue powder (CG). After heating at 850 ° C for 4 h in a mu ffl e furnace, roasted coal
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(PDF) Axial Compression of Glass Fiber Tube-Gangue
Cement Water Coal gangue Stone Sand Water reducing agent Fly ash. Gangue concrete 320 175 820 ...
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Research on Coal and Rock Type Recognition Based on Mechanical Vision
In order to identify different kinds of coal, rock, and gangue, the FPV integrated image transmission camera is used to collect images of 6 types of coal, 8 types of rocks, and 2 types of coal ...
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Thermal decomposition and oxidation of pyrite with different
Coal gangue is a mixture of rocks discharged during coal mining and processing in all coal-producing countries and is considered as a solid waste that is harmful to the environment. Data from the National Development and Reform Commission of China show that China's current cumulative stock of industrial solid waste is approximately 60 …
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Microstructure of Coal Gangue and Precipitation of Heavy
The microstructure and mineral composition of the gangue play a decisive role in the precipitation of heavy metal elements. In this study, the microstructure, mineral composition, and precipitation of heavy metal elements of coal gangue with different weathering degrees were analyzed through electron microscopy, X-ray diffraction, and …
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Experimental study on cement stabilized macadam-gangue …
To effectively utilize coal gangue and reduce the damage to... | Find, read and cite all the research you need on ResearchGate. Article. ... 43%-47% coal gangue, and 2# crushed stone. Based on ...
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