Crushing characteristics of coal and gangue under impact load were expressed by crushing ratio and crushing probability. Experimental results showed that crushing ratios of coal and gangue decreased with an increase of particle size and impact velocity. As the impact velocity was between 5–8 m/s and the initial particle size was …
To ensure slurry stability and reduce the cost of gangue crushing, gangue powder with an upper limit particle size of 3 mm was used in the slurry preparation. ... the proportion of coarse and fine ...
To study the heterogeneity and local heterogeneity of gangue particle size distribution (PSD) under ball milling, gangue from northern Shaanxi coal mine was taken as a research object. The multifractal pattern of PSD and the variation trend of characteristic parameters of gangue under different ball-to-gangue ratios and grinding times were …
Lateral movement evolution law of block of crushed gangue under triaxial compression. The lateral movement of the blocks in the crushed gangue are obtained considering various strain states at σ ...
At present, the cumulative storage of coal gangue in China exceeds 7 billion tons, covering an area of approximately 70 km2. The engineering application of unburned coal gangue is mainly utilized as …
M and S, respectively, signify that coal gangue replaces coarse aggregate and fine aggregate, and 0, 3, 6, and 10 indicate volume replacement ratios of coal gangue is 0, 30%, 60%, and . R ca and R fa refer to the ratio of coal gangue replacing coarse aggregate and fine aggregate, respectively.
Process of filling goaf with coal gangue slurry. The process of filling goaf with coal gangue slurry is shown in Fig. 2.Specifically: the coal gangue is crushed by a multi-stage crusher and enters ...
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, a waste produced during coal mining, has been regarded as the largest source of industrial waste in China. It is estimated that the production of 1 t coal generates 0.1–0.25 t coal gangue [1], and the total stockpile of coal gangue exceeds 6 billion tons in China [2], [3].The coal gangue not only occupies …
This paper provided a comprehensive review of various modification methods (including mechanical, chemical, microbiological, thermal, hydrothermal and composite modifications) employed to enhance the soil improvement performance and reduce the …
Soil-rock mixtures (SRM) are extensively utilized as filling materials in engineering slopes and roadbeds. A comprehensive understanding of the crushing characteristics of SRM during compaction is ...
Underground coal mining leads to environmental problems such as gangue pollution, surface subsidence and soil erosion, etc. Solid backfilling coal mining (SBCM) can control the strata movement ...
Mixed grain size gangue reduces crushing cost and fills the overhead area between large grain size gangue, making the gangue in close contact with each other, …
Coal gangue sand barrier plays a significant role in sandy soils improvement, and it promotes the great increase of soil organic matter, nutrient elements such as N, P, …
Dang et al. 28 studied the inuence of dierent thicknesses and positions of coal gangue on the soil water inltra-tion. Studies on water inltration under dierent mulching conditions are few compared ...
Coal gangue is a by-product generated from coal mining and washing. Using coal gangue as aggregate is an effective approach of valorization this high-volume industrial waste, not only solving the ...
Coal gangue, as a subgrade filler, is of great significance for the sustainable development of the economy, society, and environment. Particle crushing tests were conducted on coal gangue coarse-grained subgrade filler (CGSF) under uniaxial compression conditions, and the relationships between load and displacement, …
In solid backfill coal mining (SBCM), loose gangue backfill material (LGBM) is used to backfill the goaf after coal resources are exploited from the underground mines. Under certain geological conditions, LGBM with a certain height may be soaked in the water, and then becomes saturated, significantly altering its mechanical properties. The …
The diffusion characteristics of fine-grained gangue slurry are significant for gangue consumption and ecological environment protection, especially in underground mines.
Fine-grained calcareous silt interlayers with a non-uniform thickness are distributed discontinuously in the hydraulically reclaimed foundation of island-reefs in the South China Sea. Because of their high compressibility and low strength, these interlayers commonly cause differential foundation settlement and result in the cracking of …
Coal gangue slurry backfilling technology utilizes the voids formed by the caving and fragmentation of overlying rocks as storage space for gangue, achieving in …
Coal gangue calcined kaolin process is crushing (200-325 mesh) → calcining (remove carbon) → crushing → magnetic separation (remove iron impurities to strengthen whiteness) → grinding (improve fineness) → finished product (0-325 mesh, over 97% of kaolin content). Please note that coal gangue is tough and easy to corrode.
The gangue backfill material used in this experiment is from the gangue field of Fuxin City in Fig. 1, and the samples are prepared in the laboratory (crushing, screening, etc.) to obtain single ...
Crushed gangue backfilling material (CGBM) is most commonly used as a kind of solid backfill material for SBCM. When it is filled into the goaf, the phenomenon of particle crushing occurs in the …
The fine aggregate used in the test was river sand from Jiaozuo City, Henan Province, China, with a fineness modulus of 2.8. ... which was the main reason for the high crushing value of coal gangue. For coal gangue formed by natural extrusion, there were natural cracks between internal phases, and the discrete data obtained by …
Coal gangue power generation Coal gangue grinding adopts fluidized bed technology. When the carbon content is greater than 20%, it can be used as energy and can be used to generate electricity. …
In order to increase the crushing rate of coal gangue coarse particles during tamping, improve the fine-rough ratio, and improve the physical and mechanical properties of coal gangue filling, the single …
We hypothesized that the coal gangue mulching on the surface of soil columns can change the movement of water on the soil surface, thereby affecting the …
In this study, the use of coal gangue aggregate for sequestrating CO 2 can not only reduce the emission of CO 2, but also strengthen the modification of coal …
Coal gangue, a byproduct of coal mining with massive generation, presents a major challenge for resource utilization. In this study, SiO2 aerogel was successfully fabricated from coal gangue, via a facile and cost-effective approach. The aerogel boasts an intricate network framework structure internally and functions as a mesoporous …