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·In the process of coal resource mining and consumption utilization a large amount of coal gangue solid waste is accompanied 1 present the western mining area has become the main production
·Coal gangue is a mine waste generated during the mineral processing phase of coal production With the surge in demand for coal in thermal power steel and cement generation industries the rate of coal gangue generation has reached unprecedented heights With the realisation of potential threat posed by coal gangue researchers have made attempts to
The cemented coal gangue backfill CGB in coal mining is normally made of gangue particle size of 0 15 mm fly ash cement and water In this study the effects of the weight content ranging from 20% to 60% of fine gangue 0 5 mm on the microscopic characteristics resistivity and compressive strength of CGB were investigated at 3 d and 28 d curing times respectively
·The coal industry is an important pillar industry of economic development in China with coal mining produced a lot of coal gangue which is occupied land and pollution of the environment and the production and life of coal producing areas have been seriously affected coal gangue has become a heavy burden restricting the sustainable development of coal
·To elucidate the effects of long term 20 years afforestation with different woody plant species on the soil microenvironment in coal gangue polymetallic contaminated areas This study analyzed the soil physicochemical properties soil enzyme activities soil ionophore bacterial community structure soil metabolite and their interaction relationships at different
A coal mine gangue underground sorting collaborative in situ backfilling and mining system to achieve different target levels has been proposed which mainly includes three different levels of underground coal gangue separation technolo gy i e full particle separation coal gangue separation and raw coal gangue discharge and two aspects of
·Possibility of cemented gangue backfill was studied with gangue of Suncun Coal Mine Xinwen Coal Group Shandong and fly ash of nearby thermal power plant in order to treat enormous coal gangue on a large scale and to recovery safety coal pillars The results indicate that coal gangue is not an ideal aggregate for pipeline gravity flow backfill but such
These coal gangue heaps had been stacked for 20 25 years Coal gangue discharge halted following the closure of the mines in 2010 The landform type was mainly hilly and mountainous The predominant land use in the vicinity of coal gangue heaps was agriculture where corn was the main cultivated crop
·Coal mining and washing is accompanied by the production of large amounts of coal gangue which exerts a notable influence on the natural environment However as a form of solid waste coal gangue exhibits a wide range of potential applications in the field of recycling Nowadays the utilization rate and quality of coal gangue are
·In China the lack of Li resources is in stark contrast to a large amount of coal gangue produced by coal mining To determine the distribution patterns and existing status of lithium Li elements in the coal gangue the mineralogical and geochemical analysis were formed on samples of the roof floor and parting of No 02 2 8 and 9 coal seams being mined in
·China s total coal production in 2021 exceeded 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 Expand
·Coal gangue as a solid waste generated during coal mining and washing not only encroaches on a large number of land resources but also poses certain risks to the environment It is reported that the cumulative amount of coal gangue piled up in China has reached 6 billion tons and the annual discharge amount is about 500 800 million tons
·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 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 agricultural land in large areas but triggers
·Top coal caving is a process for the rational extraction of large amounts of coal resources However this process readily causes release of excessive amounts of gangue during the coal release process The conventional technique which involves visual inspection is not only labor intensive but also can introduce inaccuracies Coal and gangue identification methods
·Backfill mining can effectively alleviate the problems of surface collapse and ecological water pollution in which the mechanical properties of backfill materials including coal gangue and coal fly ash have a decisive role in the effect of filling mining In this study we analyze the permeability characteristics of coal gangue filler through a set of homemade
3 ·Using coal gangue as subgrade filler CGSF can address the accumulated issues of coal mine waste but also save the constructing costs which has the important ecological and engineering
·The research above on the recognition of coal and gangue in LTCC mining primarily adopt the principles of image grayscale sound spectrum vibration spectrum natural γ method and various
·Coal mining a major industry inadvertently contributes to environmental pollution with coal gangue identified as a significant source of contamination 1 studies have indicated that
The large scale open air storage of coal gangue often leads to oxidation and decomposition due to natural weathering resulting in decreased strength and instability which limits its wider application in concrete pavement To address these issues this paper proposed a composite consolidation treatment for weathered coal gangue WCG assessing its effectiveness and
·Coal mine paste backfill materials are mainly gangue fly ash and cement most of the gangue comes from the coal waste piles accumulated on the ground for many years and the amount of gangue produced in the process of coal mining and washing is very limited which cannot meet the long term and large scale backfill application
·The application in soil improvement activated by microorganism could realize the large scale use of coal gangue nearby the mine area with low cost and no secondary pollution The key technology of scaling up application lied in the developing of more functional strains and preparation of solid microbial agents due to its convenient
·Among them 16 gangue and 18 coal samples were collected from the Shenfu Dongsheng mine 18 gangue and 27 coal samples from the Yanzhou mine and 16 gangue and 5 coal samples from the Pingshuo mine We utilize an Ocean Insight brand MX2500 spectrometer to collect laser induced breakdown spectral data of the samples which has a spectral range
·Coal gangue has accumulated huge coal gangue piles occupying lots of land as well as having striking influence on the neighboring environmental effects This paper seeks a new way of coal gangue treatment in which the coal gangue blended with shale and sludge was sintered in rotary kiln to form lightweight aggregates
·Research on coal gangue recognition method based on XBS YOLOv5s; The influence of NaOH concentration on the strength and microstructure of ceramic binders prepared from coal gangue through geopolymerization; Research Progress on Vegetation Ecological Restoration of Abandoned Land in Coal Mine Area; Adaptive image enhancement and particle
