Coal gangue CG which accounts for about 10 20 % of coal output is a kind of solid waste generated during the coal mining and washing processes Its Mohs hardness is around 3 lower than the Mohs hardness of crushed stone typically employed in construction
Furthermore it is evident that variations in carbon content and distribution directly impact the levels and distribution patterns of silicon aluminum elements within the coal gangue Hence a strong correlation exists between the macroscopic properties such as crushing value and hardness of coal gangue and the carbon content and distribution
The acid pollution produced from coal gangue piles is a global environmental problem Terminal technologies such as neutralization precipitation adsorption ion exchange membrane technology biological treatment and electrochemistry have been developed for acid mine drainage AMD treatment These technologies for treating pollutants with low
Reflected light microscopy is an essential method in earth and materials sciences for the observation of opaque minerals in rocks metallic ores coals and of synthetic phases in slags cements
The persistent reliance on coal has resulted in the accumulation of substantial coal gangue a globally recognized problematic solid waste with environmental risks Given the coal gangue properties and global land degradation severity the resourceful utilization of coal gangue as soil conditioners is believed to be a universally applicable cost effective high
Vickers hardness of coal gangue increased from GPa to GPa and the fracture toughness increased significantly to MPa m 1/2 Under K feldspar and blast furnace slag treatment the approximate thickness of micro crystalline glaze was about 32 μm
attention mechanism module to improve the recognition accuracy of coal gangue Guo et al [15] proposed a coal gangue recognition method based on a TW RN optimized CNN which improves recognition accuracy while reducing recognition time Li et al [16] pro posed to solve the problem of coal gangue recognition in visible near infrared spectroscopy
Coal is used as a major source of energy throughout the world In 2015 coal supplied 29% of energy world wide; despite increases in use of renewables the share of coal is expected to still be 24% by 2035 Since global energy consumption is expected to increase by 30% by 2035 the actual amount of coal consumed per year will increase from 3840
CG1 is Hebei coal gangue which comes from a coal gangue processing plant in Xingtai Hebei Province It is brownish black powder after drying and grinding CG2 is Shanxi coal gangue from Shanxi Geology Group Co Ltd After treatment the color is black and gray CG3 is Chongqing coal gangue sampled from Chongqing coal gangue mountain after
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 utilization mainly including extracting and recovering
Utilizing the difference in hardness coal and gangue can be separated by the impact crush technology for utilization underground The influence of hardness and impact velocity on the crush ratio difference of coal and gangue was studied using an
The hammer crushers are the choice of most coal plants because they can handle medium to bituminous coals of varying hardness A single hammermill crusher can break coal into shape at one time integrating coarse and medium crushing saving process and investment costs The coal gangue can be recycled The coal ash can be collected by a
According to the regression analysis of the results there was a close linear relationship between the lost coal rate mixed gangue rate hardness of coal and gangue and the rotor speed The lost coal rate increased as the hardness of coal increased and decreased as the rotor speed increased The mixed gangue rate decreased as the hardness of
According to incomplete statistics the amount of coal mining under buildings railways and water bodies of production mines is up to × 10 10 t [1] and the cumulative amount of gangue piled
Moreover coal gangue was a byproduct of the coal mining and washing processes accounting for approximately 10 % 25 % of the total raw coal production [[9] [10] [11]] Its carbon content was relatively low and its hardness was higher than that of coal [12] According to the data of China Resources Comprehensive Utilization the production amount of coal gangue in 2021 was
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 Now coal gangue utilization is a
Coal gangue Fig 1 is a type of rock formed during the coal formation process resulting from The hardness of coal gangue varies depending on the mineral composition and sediment characteristics but it is generally soft and prone to cracking The surface of coal gangue is often covered with coal mud and fine particles making it loose
To reveal how CaF2 improves the dissolution ratios of aluminum and iron ions in coal gangue CaF2 and hydrochloric acid are used to extract Al3 and Fe3 from the coal gangue calcined powder The leaching ratios of Al3 and Fe3 are measured and the filter residues are analyzed by BET XRD and SEM The results show that adding 3% CaF2 could increase the
Coal gangue the primary solid waste generated during the coal mining process is typically disposed of on the surface where it gradually accumulates to form gangue piles that significantly Expand PDF Save Safe and environmentally friendly use
Coal gangue powder—mineral powder 1 1 as filler % polyester fiber dosage The hardness of spontaneous combustion coal gangue is lower than that of unspontaneous combustion coal gangue Therefore if the coarse aggregate of cement stabilized coal gangue mixture is replaced by spontaneous combustion coal gangue instead of unspontaneous
Further the hardness value of ITZ of coal gangue is higher than that of crushed stone; therefore coal gangue can effectively improve the performance of concrete ITZ which provides a favorable direction for the use of coal gangue as coarse instead of crushed stone Download Download high res image 718KB Download Download full size image
The crushing rates of coal and gangue were chosen as investigation target and a comprehensive analysis was made for the coal gangue hardness relative difference value crushing velocity and crush frequency According to the theory of selective crushing of coal and gangue an impact crusher was used in crushing
attention mechanism module to improve the recognition accuracy of coal gangue Guo et al [15] proposed a coal gangue recognition method based on a TW RN optimized CNN which improves recognition accuracy while reducing recognition time Li et al [16] pro posed to solve the problem of coal gangue recognition in visible near infrared spectroscopy
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