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Consequently the disposal and utilization of coal gangue has become an urgent problem Recently the use of coal gangue as raw materials for the preparation of cement refractory materials and ceramics has already made certain progress [5 8] Despite much attention being focused on the recycling and reusing of coal gangue there are only a
·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 The apparent density of natural limestone aggregates was 2695 kg/m 3 while for the coarse and fine aggregates of CGBA it was 2239 kg/m 3 and 2410 kg/m 3
·A large amount of coal gangue buildup may be a potential fire hazard associated with the heat released by microorganisms accumulating to the point of spontaneous combustion in the presence of unburned coal pyrite FeS 2 and gangue is likely to cause large scale fire and blast disasters and produce a significant amount of toxic emissions
·1 Introduction Recognition of the density range can be used for determining the proportions of clean coal middlings and gangue in coal samples sorting coal and gangue [1] and evaluating the separation performance of equipment and regulating present density composition detection in Chinese coal preparation plants is primarily conducted
·The changes in bulk density of coal gangue particles with grinding time Fig 4 paralleled the changes in volume mean diameter D 4 3 Bulk density decreased with grinding time between 8 h and 10 h increased between 10 h and 14 h and decreased between 14 h
·Studies have shown that the apparent density of coal gangue ceramsite concrete CGCC is lower than that of normal concrete NC In terms of reducing the brittleness of CGCC adding steel fiber to CGCC can reduce the brittleness When the volume fraction of steel fiber is not more than % increasing the volume fraction of steel fiber can
·This ensures that low density material is incorporated into the refined coal product Regardless of density the coal tended to tilt more toward the bottom layer as the particle size decreased This results in a poor density stratification effect with refined coal products mixed with gangue and an increase in the mismatch content
·Compared with other methods for coal and gangue identification such as those based on visible light [5] multispectral imaging [6] and liquid based intervention [7] X ray separation of coal exhibits remarkable environmental adaptability and remains impervious to the influence of light dust moisture or surface adhesion [8] [9] [10] Guo [11] proposed a new
·The coal and gangue in the same sample group were placed into a heavy liquid with a density of kg/L; to separate coal and gangue dry and weigh them respectively The quality of the coal divided by the total mass is the coal content in gangue
·A new method is proposed in this paper to separate gangue from coal on the basis of density calculated from volume using three dimensional 3D laser scanning technology This approach is based on the laser triangulation method and weight Taking into account the weigh in motion technology that is currently widely applied the main objective
·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 scene The reasonable utilization
·Therefore coal gangue can be used as a substitute for the soil currently used The optimum composition ratio of the coal gangue planting substrate is as follows coal gangue to soil ratio of 1 1 500 g 500 g maize straw content of 50 g kg −1 fly ash content of 37 g kg −1 and water retention agent content of 1 g kg −1 The results
·modification of coal gangue CG was performed with titanate coupling agent 201 isopropyl tri and the effects of surface modifier on mechanical properties and thermal stability of high‐density polyethylene filled with CG HDPE/CG and high‐density
·Abstract Low density ceramic proppants were prepared from calcined flint clay and solid waste coal gangue by pelleting drying screening and sintering namely solid state sintering method The density and breakage ratio of the proppants were systematically investigated as a function of sintering temperature
·This paper first studied the occurrence modes of critical metals lithium Li niobium Nb and rare earth elements REY in coal gangue CG by sequential chemical extraction and the distribution and enrichment degree of critical metals in different density and size fractions were also studied and then CG was pretreated with intercalation and calcination
Calcined flint clay wt % Al2O3 and solid waste coal gangue were used to prepare low density ceramic proppant by solid state sintering method The density and breakage ratio of the ceramic proppant were systematically investigated as a function of sintering temperature
·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 and harmful organic substances in
·The coal gangue/Ti3C2 MXene hybrid has a tailored amorphous/crystalline heterostructure enhanced active TiO2 termination and a stable SiCx protective layer; thereby it achieved an excellent rate stability V when the conducted current density returns to 100 mA g −1 Coal gangue with an amorphous SiC X protective layer as the
Efficient disposal of coal gangue is a worldwide problem owing to its massive accumulation and harmful effects on the environment [10] Statistics show that approximately 3000 hills of coal gangue exist in China the stockpile of coal gangue has reached billion tons and billion tons of coal gangue is produced annually [11]
·The effect of the coal gangue aggregates to sand ratio G/S PVA fibre %wt to cement ratio F/C and the coal gangue aggregates CGA particle size on the working and mechanical properties such as compressive strength CS splitting strength SS and density of lightweight coal gangue shotcrete LCGS were studied
·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
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
