·There have been several industry operations about co firing of coal gangue and coal in actual power plants and found that blending coal was favorable to firing of coal gangue in CFB [15 16] More studies of the combustion of coal gangue and coal blends in air atmosphere were investigated using thermogravimetric analysis TGA in the literature [[17] [18] [19]]
Therefore addressing the water atmospheric and soil environmental pollution caused by coal mining and coal gangue accumulation this paper summarizes the relevant research progress on the resource utilization of coal gangue in the production of energy recovery of valuable metals production of building materials and other directions and
·Coal gangue is one of the largest industrial residues in China that is discharged during the processing and utilization of coal Gu 1997 Liu and Liu 2010 With continuous growth of coal mining and coal cleaning a large amount of coal gangue are produced which contain sulfide minerals alumino silicates minerals other inorganic minerals and organic matter
·Global rise in greenhouse gas emissions GHG is triggered mainly due to the consumption of fossil fuels for power generation and domestic usage Among the fossil fuels coal is a primary contributor to global GHG with substantial emissions generated during its mining and combustion process Coal gangue a residue produced during the coal mining process has
·Coal gangue as an associated product of coal mining can cause a large number of piles to undergo slow oxidation and spontaneous combustion resulting in the production of toxic and harmful gases leading to casualties environmental damage and economic losses Gel foam has been extensively employed as a fire retardant material in coal
·This study explores the potential of municipal solid waste incineration bottom ash MSWI BA and coal gangue as precursors for alkali activated cementitious materials CG MBA An examination of the impact of MSWI BA content NaOH/Na2SiO3 ratio liquid solid ratio and NaOH concentration on strength and reaction through the application of diverse analytical
·Bioremediation of heavy metals pollution from acidic coal gangue with sulfate reducing bacteria Daozhi Ma 1 2 3 4 5 Xinyu Liu 4 Mingjiang was enhanced in comparation to R M and R S The results demonstrated that SRB significantly inhibit acidic coal gangue contamination and the biostimulation is also a potential solution due to
The current research on toxic elemental pollution from coal gangue primarily focuses on the leaching and migration of heavy metals during gangue accumulation on the surface Chilikwazi et al 2023 When gangue is deposited on the ground or backfilled into collapse pits elements such as Cd Cu Pb and Zn enriched in coal gangue will migrate to the soil surface water and
·After the oxidation of harmful elements in coal gangue due to water air and microorganisms the surrounding soil surface and groundwater will be polluted He et al 2016 At the same time atmospheric pollutants emitted from spontaneous combustion of coal gangue will also pollute the environment Querol et al 2008 Coal gangue has mainly
·Findings indicated that the addition of bactericide effectively inhibited the oxidation of Fe2 preventing pH decreases and oxidation reduction potential increases Oxidation of pyrite in the coal gangue dumps usually results in acidification and spontaneous combustion causing many environmental problems such as air soil and water pollution The
·In this paper the physical chemical and pollution characteristics of coal gangue are summarized and the ecological restoration mode is divided into two modes traditional "end treatment" and "treatment while piling" The action mechanism advantages and disadvantages and application scope of various ecological restoration technologies
·Coal gangue is divided into weathered gangue and newly produced gangue The pH of newly produced gangue is 6 ∼ 9 For newly produced gangue the governance objective is to prevent gangue autoxidation in air and reduce the concentration of
·Coal gangue is the main pollution source of mining areas When coal gangue is stacked and recycled the heavy metal elements contained in it are released by natural weathering and leaching which causes damage to the surrounding ecological environment In this study the leaching and precipitation characteristics of heavy metals in low sulfur coal gangue
·Coal gangue CG is a complex solid waste generated from coal mining and coal washing whose major chemical composition is SiO 2 and Al 2 O 3 with carbon content of 15% 30% Li et al 2010; Wu et al 2021; Zhang et al 2022 The accumulation of coal gangue not only occupies land resources but also results in serious environmental pollution Sun et al 2009
·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 Furthermore substantial CG accumulation has given rise to severe pollution and degradation of air land water resources and ecosystems Fig 3 [3] In regions exposed to direct sunlight
·Aiming at the pollution problem of dye wastewater the preparation conditions of calcium based coal gangue were optimized by using coal gangue and CaCl2 as materials
·Coal plays a crucial role as a mineral resource worldwide However approximately 10 % 15 % of mined coal remains as commercially worthless coal gangue after the mining and purification process is completed Li and Wang 2019 The utilization of coal gangue inevitably leads to secondary environmental pollution through processes such as combustion
·Coal gangue is a byproduct of coal mining and processing and according to incomplete statistics China has amassed a substantial coal gangue stockpile exceeding 2600 large mountains which poses a serious threat to the ecological environment Utilizing gangue as a coarse aggregate to produce gangue concrete GC presents a promising avenue for
·in a coal gangue dump of the Gequan Coal Mine China FAN Jingsen1 2 SUN Yuzhuang1 LI Xinyu3 In this paper in order to understand pollution speed of harmful organic substances and heavy metals from coal gangue dumps the Gequan Coal Mine Dump is selected as the sampling site The Gequan Coal Mine is located in the Xingtai
·Traditional technologies for coal gangue identification and sorting are characterized by high labor intensity complex processes environmental pollution resource wastage low sorting efficiency
·The backfilling mining method that fills gobs with coal gangue can prevent water inrush hazards protect groundwater resources and protect the ecological environment of the mining area However initial conditions including the particle size distribution of gangue and the stress environment may affect the seepage characteristics of gangue backfill and inrush
·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
