Mixing coal gangue with soil to reconstruct degraded soil can inuence soil in˚ltration ... were crushed using a rubber hammer before sieving. e coal gangue was crushed by using a steel hammer ...

The amount of coal gangue, a by-product of coal mining and washing, is rapidly increasing with the growing trend of energy consumption. The accumulated coal gangue without appropriate utilization has resulted in a squander of resources, waste disposal and environmental pollution issues. Over the past few decades, there has been …

1. Introduction. Soil Cd pollution is a common ecological problem in gangue pile areas (Li et al., 2014).Owing to global industrial development, numerous coal reserves have been mined, causing accumulation of large amounts of Cd-containing coal gangue (Li et al., 2019; Zhou et al., 2022).The Cd in coal gangue migrates into the surrounding …

This review article also provides insights into CG's potential applications including its use as a subgrade and subbase material in pavements, landfill liner material, and filter material for hydraulic structures. The sustainability benefits attainable through CG utilization in geotechnical and geoenvironmental applications are also highlighted.

Mixing coal gangue with soil to reconstruct degraded soil can inuence soil in˚ltration ... were crushed using a rubber hammer before sieving. e coal gangue was crushed by …

gangue belongs to coarse-grained soil, and its compaction characteristics are important for ensuring its effectiveness in engineering applications. The physical and mechanical proper-

Yang Ke et al. 7 conducted compression tests on crushed gangue ... Figure 8 shows that the cumulative energy-time curve of gangue sample can be divided into three stages in ... Rock Soil Mech . 5 ...

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.

Global rise in greenhouse gas emissions (GHG) is triggered mainly due to the consumption of fossil fuels for power generation and domestic usage. Among the fossil fuels, coal is a primary contributor to global GHG with substantial emissions generated during its mining and combustion process. Coal gangue, a residue produced during the …

Particle flow simulation of broken gangue backfill materials can be used to effectively study the bearing-compression characteristics of gangue backfill materials. The 3D reconstruction of the digital model for the real shape of the irregular gangue blocks is crucial for the numerical simulation of particle flow to accurately express the spatial and …

Heavy-metal polluted soil is regarded as a major threat to human and environmental health 13,14,15, and heavy metals are quite common in the soil around …

Most ores, however, are made up of hard, tough rock masses that must be crushed before the valuable minerals can be released. In order to produce a crushed material suitable for use as mill feed (100 percent of the …

Coal gangue is a solid waste emitted during coal production. Coal gangue is deployed adjacent to mining land and has characteristics similar to those of the soils of these areas. Coal gangue–soil ecosystems provide habitats for a rich and active bacterial community. However, co-existence networks and the functionality of soil and coal …

China's total coal production in 2021 exceeded 4.13 billion tons, 52% of the world's total. Coal gangue, a solid waste of coal mining accounts for 15–20% of coal production, when directly discharged on the ground surface as waste heaps, it occupies large areas of land and cause environmental pollution. This paper summarizes the …

1. Introduction. Coal gangue is a solid waste produced during coal mining, washing, and processing, accounting for about 10–20% of raw coal output [].According to incomplete statistics, China's coal gangue accumulates 40 billion tons, accounting for 120 km 2 or more, and continues to increase at speeds of 0.37–0.55 Gt per year and …

Select crushed and screened gangue from Bulianta, sieving them to a particle size range of 1.0–3.0 mm. ... The practical application of biomimetic soil in engineering involves injecting a slurry-form soil into the gaps between coal gangue, creating an integrated biomimetic soil-gangue soil reconstruction layer (Fig. 9). In …

Coal gangue is a kind of industrial solid waste with serious ecological and environmental implications. Producing concrete with coal gangue aggregate is one of the green sustainable development requirements. This paper reviews the properties and preparation methods of Chinese gangue aggregate, studies the influence of gangue …

Components of the planting substrate include coal gangue, sandy loam soil, fly ash, maize straw and water retention agents. The coal gangue was collected from Shangxinfang in the Mentougou District in Beijing. The particle size of the coal gangue was 1 cm–8 cm, and it was crushed to 50–100 mesh in the laboratory.

Gangue filling in the goaf is an effective measure to control the surface subsidence. However, due to the obvious deformation of gangue compression, the filling effect deserves to be further studied.

This practice entails utilizing materials like gangue, sand, and crushed stone to fill the goaf, with the primary objective of minimizing subsidence associated with the mining process ... with less than 15% infiltrating into the rock and soil layers. Moreover, the area experiences a high average annual evaporation of 1611 mm, ...

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 ...

Coal mining causes serious ecological and environmental damage. The crushed gangue is backfilled into underground goaf, which not only inhibits mining …

The changes in soil urease activity in the coal gangue accumulation area are shown in Fig. 1 A. The urease activity in the Pa and Pt + Pa restoration areas was significantly increased by 1.54–3.39 fold in the shallow soil, and was reduced by 74.2% in the Pt + Pa restoration area in the middle depth soil, compared to the unremediated …

These wastes usually include coal gangue (without valuable crushed coal and gangue), rocks, soil, and other minerals. ... 20%, coal can be recovered through coal preparation. This way, the GKLM vertical mill must be used to grind the coal gangue into coal gangue powder. Coal gangue grinding powder is used for building materials After …

The compressive characteristics of crushed gangue under different axial stresses as shown in Fig. 6. Based on the stress–strain curves, the compaction process of crushed gangue could be divided into three stages. ① Void compaction. The gangue sample is in the state of free accumulation with high porosity before applying axial …

Before the experiment begins, engineering slurry in its natural state is collected, dried, crushed, and sifted through a 0.075 mm mesh to be stored for later use. For each calcination, 1 kg of coal gangue is placed in a muffle furnace and heated at a consistent rate of 5 °C/min to predetermined temperatures (specifically: 615°C, 650°C, 700 ...

Figure 10a shows the in situ state of the soil foundation. Next, the coal gangue gravel was sieved to remove particles greater than 6 cm. The removed particles were amassed, crushed into smaller ones, and sieved again until they were able to be used. This sieved coal gangue gravel was mixed homogeneously before being …

The coal fly ash concentration has a positive relationship with the acceleration factor. 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.

According to the scanning electron microscope test results, coal gangue contains a large number of clay minerals (in sheet form), mainly kaolin, hematite, and other minerals, with a large number ...

The crushed gangue in the sample will come into local mutual touch when the amount of hard crushed gangue grows to a specific point. The formation of a stable …