The chemical composition of coal gangue was shown in Table 2 Table 2 Main chemical composition and content of coal gangue Composition SiO 2 Al 2 O 3 Fe 2 O 3 CaO MgO K 2 O Na 2 O TiO 2 SO 3; Content % River sand RS and coal gangue CG with maximum size of mm were selected as
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— Currently the amount of accumulated coal gangue is approximately billion tons and there are more than 1600 coal gangue mounds that occupy approximately 15 000 ha of land; moreover the quantity of gangue accumulation is increasing at a rate of 200 million tons per year [1] [2] With the rapid development of infrastructure
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— Table 1 summarizes coal fly ash chemical composition ranges worldwide It appears that the SiO 2 content of India s fly ash 50 60% is substantially higher than that of China and the US 36 38% up to 57 58%
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— The partition behaviors of trace elements during coal gangue firing are dominated by certain factors including the content and modes of occurrence of trace elements in coal gangue physic chemical
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— The effects of coal gangue and fly ash on the hydraulic properties and water content distribution in reconstructed soil profiles of coal mined land with a high groundwater table Hydrol Process
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— This study aims to investigate the effect of silicon content on chemical structure of coal gangue derived PAFSiC as well as the coagulation performance and floc properties during bio treated coking wastewater treatment The PAFSiCs with different Al Fe /Si molar ratios from 5 1 to 15 1 were synthesized from coal gangue
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— CG used in this paper was obtained in Huaibei mining area Anhui Province China NA was selected as an experimental comparison The particle sizes of both raw coal gangue aggregate CGA raw and NA were in range of mm Type Portland cement was provided by Onoda Co Ltd Nanjing Table 1 reveals that the main
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— 1 Introduction The coal gangue accounts for about 10 20% of coal production and it is one of the largest industrial solid wastes emitted in China [1 2] It occupies land and pollutes the atmosphere and water [3 4] so carrying out comprehensive utilization of coal gangue is one of the important ways to solve these
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— The carbon content of coal gangue should be considered in the energy utilization mode; the combustion of low carbon coal gangue causes low calorific value and thermal efficiency By comparing coal gangue and soil properties chemical composition nutrient elements etc Wang et al pointed out that coal gangue can potentially be used
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— 1 Introduction The flotation process is a separation technique primarily used in mineral processing for the recovery of minerals Wills and Finch 2016 that also finds application in other industrial processes such as wastewater treatment and paper recycling Saththasivam et al 2016 Vashisth et al 2011 Separation of mineral particles
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— During the extraction and processing of coal a large amount of solid waste collectively known as gangue is produced This gangue has a low carbon content but a high ash content accounting for approximately 15 to 20% of the total coal yield Before coal is used coal and gangue must be effectively separated to reduce the gangue content in the
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— 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
— The XRD patterns of bulk rocks of some samples Fig 2 showed that the mineral composition of the coal gangue was primarily kaolinite quartz and pyrite with small amounts of calcite illite and orthoclase except the pyrite nodule sample The mineral content of coal gangue considerably varies across different areas
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