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·The disposal and utilization of solid waste of coal gangue is one of the main problems in coal mining in China Xie et al 36 used COMSOL Multiphysics finite element analysis software to
of heavy metal elements of coal gangue with different kaolinite between which the proportion of kaolinite was the largest that is 33% and 42% respectively The components
·The distribution characteristics of trace elements during combustion of coal gangue soybean stalk and their blends Download Download high res image 387KB Download Download full size image; Fig 6 The distribution characteristics of trace elements during combustion of coal gangue sawdust and their blends
·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
·To evaluate the release and transformation characteristics of different forms of Cl in coal gangue during combustion the effect factors of combustion temperature combustion time and air flux were investigated using a small tubular furnace; the modes of occurrence of Cl in coal gangue and its combustion residues under different temperatures were extracted with
·The Environmental Geochemistry of Trace Elements and Naturally Radionuclides in a Coal Gangue Brick Making Plant Chuncai Zhou1 2 3 Guijian Liu1 2 Siwei Cheng 1 Ting Fang & Paul K S Lam3 1CAS
·Coal gangue has dual attributes of waste residue and resources Clarifying the release characteristics of harmful trace elements from the coal gangue can provide a theoretical basis for environmental impact and resource utilization In this study the characteristics of harmful trace elements released from coal gangue in Xinjiang during dynamic leaching and static
·Coal gangue releases heavy metals and toxic and harmful substances in the weathering process which affects environmental health Ouyang et al 2022; Wang et al 2016 Since the 1990s in China
Taking Daizhuang Coal Mine coal gangue paste backfilling as example phy chemical properties and optimized proportion experiment of gangue fly ash and other materials are study result shows that the particle distribution of second class crushing gangue is met the requirements basically the particle of fly ash is more coarse and something like sphere glass pearl is
·Some studies have used pre enrichment methods including gravity separation density fraction 17 and flotation 18 19 20 to extract REY in coal These methods can somewhat pre enrich REY but the results are relatively low and the recovery ratio is low 21 Wet leaching is an effective method of extracting REY from coal and coal gangue Pan et al 22
·During coal and coal gangue combustion many heavy metal pollutants are emitted and cause serious environmental problems In this paper the environmental effect values of As and Pb emission during coal gangue and coal combustion in the 330 MW pulverized coal boiler 50 kW circulated fluidized bed boiler and laboratory were calculated by ReCiPe2016
The total amount of trace elements in coal gangue may not provide enough information for evaluating its environmental effects [12] Therefore it is of Quantify the trace elements fraction in coal gangue and determine the proportion of each fraction in different elements; 3 Assess the contamination degree by geo
·1 Introduction China is the largest coal producing and consuming country in the world A large amount of coal gangue including the coal roof floor and gangue approximately 10 15% of coal production is produced in the process of coal production and preparation Liu and Liu 2010; Jabłońska et al 2016 At present the stock of China s coal gangue is
· article{Wang2024CharacterizationAA title={Characterization and acid leaching of rare earth elements in coal gangue using pretreatment of selective grinding tailings discarding and alkali roasting} author={Xiaorui Wang and Wei Cheng and Ruidong Yang and Jingkun Zang} journal={Journal of Rare Earths} year={2024} url={https //api
·Energy recovery is a promising method for coal gangue utilization during which the prevention of secondary pollution especially toxic metal emission is a significant issue in the development of coal gangue utilization In the present study investigation into trace element partitioning behavior from a coal gangue fired power plant in Shanxi province China has been
Sequential extraction procedure and correlation analysis were employed to analyze the occurrence of trace elements in coal gangue Meanwhile the environmental effect of trace elements was studied by Risk Assessment Code RAC The results showed that trace elements Ba Co Cr Mn Ni Pb and V were enriched in coal gangue compared with Huaibei
·Coal gangue is one of the largest industrial residues It has high ash content low carbonaceous content and heating value Meanwhile it has some trace elements Large quantities of coal gangue cause serious environmental problems by polluting the air water and soil as well as occupying a tremendous amount of land Now coal gangue utilization is a
·Coal gangue is a mixed sedimentary rock composed of various minerals formed or trapped in coal seams during coal formation which are discharged during coal mining and washing Hua et al 2018
·Coal gangue of a certain particle size was subjected to calcination treatment and the characteristics of coal gangue before and after calcination were analyzed Mixture proportions In order to compare the effect of coal gangue before and after calcination on the properties of cement paste mix designs were carried out with water cement
·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
·The contents of 16 US Environmental Protection Agency EPA polycyclic aromatic hydrocarbons PAHs in coal gangue samples with different metamorphic degrees R 0 max=% % % %
·Therefore the extraction of Li from secondary resources has received great attention [7] [8] Coal gangue CG belongs to the bulk of industrial solid waste and the enrichment Li element of CG has been widely reported in numerous literature [9] [10] [11] Extracting Li from CG can alleviate the shortage of lithium resources
·Similar conclusions have also been obtained from coal gangue samples that is a higher number and content of heavy metal elements have been found to be released from weathered coal gangue than
