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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 …
In order to find the influence factors on coal and gangue separation, the article put forward an optimization design based on a support vector machine (SVM) and orthogonal experimental method. The crushing rates of coal and gangue were chosen as investigation target, and a comprehensive analysis was made for the coal gangue …
Based on the separation and backfilling system of coal and gangue, the mineral material impact experiments were conducted utilizing the hardness difference …
With the increase of coal gangue powder, the hardness of coal gangue/Al cermet gradually increases, while the static compression strength first increases and then decreases. When the mass fraction of gangue is 25wt%, the coal gangue/Al cermet material has the best performance. Density is 2.23g/cm3, hardness is 752HV,
characteristics of coal gangue with dierent grain sizes under side‑limit compression ... the gangue exhibits high hardness and resistance . 3 Vol.:(0123456789) Scientic Reports | (2024) 14:4910 ...
The impacting crusher was used to impact crushing test on coal and gangue from three mining with different impact velocity.The distribution function of coal and gangue,the influence of the impact velocity and the hardness of coal and gangue on the distribution function were got from the data fitting of experimental results.The results show …
With the improvement of coal mining depth and mechanization level, the difficulty of coal slime water (CSW) disposal increases. The preparation of cementitious materials with CSW can not only solve the disposal problems, but improve the structural stability and mechanical properties of coal gangue (CG) piles as a cementitious …
Given the differences of hardness between coal and gangue, after selective crushing, the gangue with the higher hardness was crushed less and coal with lower hardness crushed more, which could be separated by a 50 mm sieving plate. The material above the sieving plate was disposed of as gangue and the material below as coal.
Some studies have used pre-enrichment methods, including gravity separation (e.g., density fraction) 17 and flotation 18, 19, 20 to extract REY in coal. These methods can somewhat pre-enrich REY, but the results are relatively low, and the recovery ratio is low. 21 Wet leaching is an effective method of extracting REY from coal and …
Coal gangue is one of the largest industrial residues. It has high ash content, low carbonaceous content, and heating value. Meanwhile, it has some trace elements. Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land. …
The coal gangue dump may introduce heavy metal(oid)s (HMs) into surrounding agricultural soils, posing potential health risks to nearby communities. This study evaluated heavy metal(oid) pollution ...
The thick and hard gangue layer has long been one of the key obstacles affecting the coal recovery rate in the fully mechanized top-coal caving mining of ultra-thick coal seams, and it is also one ...
The results suggested that coal gangue significantly influences soil S, pH and plant species after 8 years of natural recovery. The CK-far plots contained relatively …
Coal gangue, produced during coal mining and processing [1, 2], is one of the most extensively produced solid wastes in China [1, 3], accounting for approximately 10%‒20% of raw coal production [].The accumulation of coal gangue causes serious environmental, social, and economic problems in the coal mining area [].Heavy metals …
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. Recycling of coal and pyrite Coal gangue adopts composite dry coal preparation, cyclone, and heavy medium separation. When the coal …
We developed a new calcination method to convert coal gangue (CG), a common waste generated from coal production process, into a modified form, which could be used as an adsorbent to remove Mn(2+) from aqueous solution. Sodium tetraborate (Na2B4O7·10H2O) was added into the CG calcination process as an additive, and the concentrations of ...
Coal gangue (CG), an industrial solid waste with high contents of Li and Ga, has attracted the attention of researchers. However, the utilization of CG remains an economic challenge. Pre-enrichment of Li and Ga by flotation was carried out with a view to improving the comprehensive utilization of CG. Mineral composition, time-of-flight …
This study was conducted at the Suntuan coal mine in the Huaibei mining area, located at 33°33′49.5072″ N and 116°46′3.3852″ E. The coal gangue used in this study was obtained from the Suntuan coal mine and crushed to a size less than 5 mm, with particles below 2 mm, accounting for approximately 70%.
Overall, to enhance the soil water storage capacity in mining areas, the results suggest that coal gangue mulching with a thickness of 8–16 cm and particle size …
Coal gangue is one of China's main industrial solid wastes, which contains various harmful heavy metal elements, such as lead (Pb). The long-term accumulation of coal gangue causes Pb to migrate to the surrounding environment due to weathering and rain erosion, eventually endangering human life and health with its continuous …
Coal gangue is the main solid waste in coal mining areas, and its annual emissions account for about 10% of coal production. The composition information of coal gangue is the basis of reasonable utilization of coal gangue, and according to the composition information of coal gangue, one can choose the appropriate application …
Among coal mining-related wastes, coal gangue (CG) is the heterogeneous waste generated during the mineral processing or coal washing phase of coal mining. A thorough understanding of environmental concerns associated with the current model of …
Coal hardness had a remarkable influence on the crush-ratio difference of coal and gangue; the gangue hardness and the impact velocity had the least effect. …
Coal gangue slurry backfilling is an important technical means of harmless large-scale disposal of gangue under low disturbance conditions, and is one of the important ways to achieve green coal mining, in line with the national green development concept. ... ③slurry replacement fluidized mining technology for hard-to-mine coal bodies. ...
Coal gangue is one of the largest mine solid wastes in China, and its discharge and stockpiling have caused resource waste, environmental pollution and other problems. Starting from the resource characteristics of coal gangue, this paper systematically discusses the ways and research status of coal gangue resource …
The typical unburned coal gangue in the Heilongjiang region is mainly composed of SiO2, Al2O3, and Fe2O3, which accounts for approximately 91% of the total mass. The unburned coal gangue meets the minimum CBR requirement of 8% after 7 freezing–thawing cycles. This study helps fully and reasonably utilize typical unburned …
The displacement field and velocity field of top coal and gangue particles have significant asymmetry characteristics in an extra-thick seam. Under the excessive drawing condition, when the mixed gangue ratio is about 10%, the pure top coal recovery can be greatly improved. ... large dip angle, soft roof-coal-floor and hard coal-roof, with ...
Currently the main method of mine solid waste disposal and utilization is to apply gangue to underground filling. For the grading characteristics of coal gangue in the hollow zone in underground ...
The results showed that separation of coal and gangue underground can be executed effectively under certain conditions: the greater the hardness difference …
Coal gangue (CG), as a solid waste generated in the process of coal mining, ... HV-1000 automatic transfer micro-hardness tester was adopted to characterize the hardness of artificial aggregates, and the calculation method referred to …