— The main reason for the size of the coal gangue is the power required for crushing coal gangue As shown in Figure 1 the raw gangue had a large particle size approximately 300 mm The power required for crushing the coal gangue from a particle size of 300 mm to 25 mm was much lower than that required for crushing the coal gangue to a
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The lowest apparent density is similar to that of natural gravel but the water absorption rate of coal gangue is higher and the crushing value is % The physical properties of coal gangue from different locations in China are shown as Table 1 Table 1
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— The bricks employed are coal gangue bricks from Taiyuan Brick Factory given their market availability and the study s exclusion of residual mortar influence in demolition bricks B100 are minimal ranging from % to % Crushing can be considered the reverse process of accumulation According to Francois s Apollonian
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— The ARD method which requires crushing and sieving the coal samples to below 13 mm and conducting wax coating measurements is not suitable for large sized coal or gangue Some studies have crushed the raw coal material below 25 mm and categorized it based on density levels rather than distinguishing between coal and gangue Liu et al
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The crushed coal gangue particles are widely used in solid backfilling However the nonuniform compaction and internal re crushing behavior of crushed coal gangue under bearing stress have not yet been revealed in current research But this is particularly significant for improving the filling effect and quality In this article with the aid of the
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— The hydraulic properties and deformation behavior of granular gangues are the main factors affecting the GBM performance As shown in Fig 1 b when the granular gangue wastes are filled into the goaf coal pillars and filling gangues are separated from each other and the gangue filling body is in a confined compression state The
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— In solid backfilling coal mining SBCM the deformation resistance of crushed gangue particle material CGPM is critical for controlling overburden strata movement and ground surface engineering practice CGPM is generally circularly compacted first by the compaction machine to reduce its
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— 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
— The gangue used in the experiment is from Jiaozuo Jiaoxi coal mine According to the Chinese classification standard for coal gangue GB/T 29162 2012 combined with the content of the book [36] the gangue used should belong to sandstone underwent a crushing process using a jaw crusher PE125X150
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— However it is difficult to rupture the gangue in the roof; owing to the gangue containing coal seams the area where the damage coefficient of the roof coal at the upper end of the support is
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— Coal gangue is a kind of solid waste with a low calorific value produced in the process of coal mining and washing According to statistics by the end of 2019 China s accumulated amount of
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— In solid backfilling coal mining SBCM the crushed gangue backfilling material CGBM is generally compacted circularly by a compaction machine in order to reduce its compressibility In this cyclic compaction process the particles are crushed which has a significant effect on the deformation resistance of CGBM However the deformation
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The consumption of coal gangue is limited when it is incorporated into the cement as active powder because of the relatively lower reactivity compared to other supplementary cementitious materials [19] Directly crushing and recycling coal gangue as aggregates is an effective way for its large scale utilization [20]
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