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·The persistent reliance on coal has resulted in the accumulation of substantial coal gangue a globally recognized problematic solid waste with environmental risks Given the coal gangue properties and global land degradation severity the resourceful utilization of coal gangue as soil conditioners is believed to be a universally applicable cost effective high
·This study encapsulated coal gangue aggregates CGAs with a fly ash cement slurry varying the content of fly ash 0 % 10 % 20 % and 30 % and maintaining a water to cement ratio of These aggregates were subjected to a curing process within an environment containing a CO 2 concentration of 20 % MPa pressure 70 % humidity and a
·To enable effective raw coal gangue use the effects of various alkali activators on coal gangue slag fly ash geopolymer grouting material CSFGM were investigated Results showed that for sodium silicate modulus at sodium silicate content at 12% and Na 2 O content at 6% CSFGM showed the highest compressive The compressive strength of
·Therefore the main objective of this paper is to provide a comprehensive literature review of coal gangue utilization in building material production energy generation soil improvement and other high added applications analyze the worldwide dynamics of the studies on coal gangue utilization and identify the potential environmental risks in
·Backfill mining can effectively alleviate the problems of surface collapse and ecological water pollution in which the mechanical properties of backfill materials including coal gangue and coal fly ash have a decisive role in the effect of filling mining In this study we analyze the permeability characteristics of coal gangue filler through a set of homemade
·To realize the large scale utilization of municipal solid waste incineration MSWI fly ash in the field of building materials and to reduce the cost of coal mine backfill mining the effects of the mixing ratio of cementitious materials the particle size distribution of aggregates and the amount and mass concentration of cementitious materials on the properties of backfill
DOI / Corpus ID 271738526; Co melting mechanisms for municipal solid waste incineration fly ash with fine slag from coal gasification and coal gangue
·From the perspective of resource recovery and environmental protection coal gangue fly ash cemented backfill coal mining has become an important direction for the green development of coal mines in recent years Analysis of the rheological parameters of backfill slurry is the basic principle to design a backfill pipeline system Coal gangue fly ash backfill slurry
·Due to rapid development and urbanization electricity demand is increasing daily Coal based thermal power plants are one of the major sources of electricity A by product of thermal power plants is fly ash; every year huge amounts of fly ash are generated globally Disposal of fly ash in landfills needs a vast area and poses various environmental problems
·Flux agents such as B 2 O 3 and SiO 2 were added to decrease the melting temperature of fly ash thereby reducing energy consumption Gao et al 2020 2021 used B 2 O 3 as a flux agent to reduce the melting temperature of MSW incineration fly ash MSWI FA The ash flow temperature FT decreased from 1211 °C to 986 °C upon adding 15% B 2 O 3 to
·Coal fly ash is primarily produced in power plants as a byproduct of coal combustion As shown in Fig 1 the by products of coal ash combustion include fly and bottom ash boiler slag and flue gas FA particles the main
·Coal gangue an industrial solid waste discarded from coal mining and processing was used as the sole raw material to prepare brick The coal gangue was crushed homogenized milled and then pressed into green compacts The dried compacts were sintered at different temperatures for 2 h The obtained brick samples were characterized with X ray
·In the context of urban low carbon renewal the application scenarios for bulk solid wastes are diverse Low carbon prefabricated buildings represent an innovative way to use solid wastes in the production of modular construction components offering numerous advantages 10 These buildings require less energy and provide higher construction precision
Coal gangue as one of the largest industrial solid wastes in China brings about very serious environmental social and economic problems Comprehensive utilization of coal gangue is of importance to sustainable development of society and economy China has made great progress in comprehensive utilization of coal gangue in the latest 40 years since the 1960—1970 s
·This paper proposes a fundamental investigation of coal gangue and fly ash impact on B pasteurii to enhance the properties of backfill materials The goal is to obtain effective microbial mineralization and potential mechanical properties of coal gangue and fly ash as backfill materials and to mitigate the impact of the most common binders used in the backfill
·Abstract Among coal mining related wastes coal gangue CG is the heterogeneous waste generated during the mineral processing or coal washing phase of coal mining A thorough understanding of environmental concerns associated with the current model of
·For high added value utilization of alumina rich coal gangue ARCG a mild hydro chemical process was investigated to extract alumina The quantity of coal fly ash and coal gangue is very
Static segregation of coal gangue fly ash backfill CGFB material presents a significant impact on its mechanical performance for underground support To resolve a novel formulation was addressed using sodium silicate SS and CO 2 as co activator Its setting behaviors and mechanical properties were investigated with respect to the coal gangue content CO 2 influx
Semantic Scholar extracted view of "Utilization of coal gangue power generation industry by product CFA in cement Workability rheological behavior and microstructure of blended cement paste" by Jihui Zhao et al Study on the cementation and engineering properties of ternary eco binder mortar containing pulverized coal fly ash mixed with
·In this investigation six groups of cemented coal gangue fly ash backfill CGFB samples with varying amounts of kaolin 0 10 20 30 40 and 50% instead of cement are prepared and their
·DOI / Corpus ID 237680757; Physico mechanical and microstructure properties of cemented coal Gangue Fly ash backfill Effects of curing temperature
·Fig 1 shows the technological process of cemented coal gangue fly ash backfill using Xinyang coal mine in China as an example Considering the narrow underground space and the dust pollution caused by dry transportation approach the hydraulic pipeline conveying is usually utilized to transport slurry from the ground to the goaf [12] Long distance pipeline
·Abstract Solid wastes from coal industry such as coal gangue CG coal bottom ash CBA and fly ash FA from coal fired power plants pose a significant impact on the environment
