Introduction In recent years, with the largescale mining of coal resources, a large amount of coal gangue is produced and accumulated on the surface. Gangue has become a serious scientific and engineering issue in the current environment of green mining.
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Resource utilization of coal gangue Coal gangue sintered bricks Building materials Environmental restoration materials Power generation Ecological restoration of abandoned mine land Summary 13. Recent practices in mine tailings' recycling and reuse Introduction
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To realize the recycling of coal gangue and obtain high valueadded products, highly porous mullite whisker ceramic microfiltration membranes for the treatment of emulsified oily wastewater were prepared using Al(OH) 3 and coal gangue as primary materials and MoO 3 as the additive. By a comparative study on the ceramic membranes with and without MoO 3 addition, the sintering reaction process ...
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Zeolite derived from coalbased solid wastes (coal gangue and coal fly ash) can overcome the environmental problems caused by coalbased solid wastes and achieve valuable utilization. In this paper, the physicochemical properties of coal gangue and coal fly ash are introduced. The mechanism and application characteristics of the pretreatment processes for zeolite synthesis from coalbased ...
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However, few reports are documented that explain the crushing of coal gangue under the action of the crushing device. ... In the process of ball milling, gangue particle size is continuously reduced by the three interaction effects of impact, extrusion and friction with the grinding medium [46, 47]. While in ball milling, as the particle size ...
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Sustainability 2023, 15, 6353 3 of 14 Test Apparatus and Procedure The model of the ball mill used in the test was a SM'500 500 mm test mill (Figure2), the power of the equipment was kW ...
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Introduction Coal mining waste has become a primary environmental concern around the world especially for those countries using coal as their main energy source. Coal gangue is the main industrial solid waste that is physically separated from bulk coal during coal preparation.
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1. Introduction. Coal gangue is a type of solid waste produced in the coal mining and washing processes. The global coal mining industry produces approximately 350 million tons of inactive gangue each year, and the accumulated coal gangue in China alone amounts to billion tons [1], [2], [3].In Spain, about 2 million tons of coal mine waste were produced in 2009.
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The invention relates to asuperwet coal gangue and loess combined pretreatment facility and a superwet coal gangue and loess combined pretreatment facility process, belongsto pretreatment facilities and pretreatment processes of paste filling raw materials. The facility is structurally characterized in that a loess metering feeder is arranged below a loess raw material cabin; a coal ...
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Introduction As the main fossil energy and the main driving force of economic and social development, largescale mining and utilization of coal resources are accompanied by the continuous production of coal gangue with an output of 800 million to 1 billion t/a.
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Activation of coal gangue is necessary as kaolinite, the major aluminumcontaining component, is chemically inert. Thermal activation is a common method by which coal gangue has been activated that is simple to implement but relatively inefficient. The percentage recovery of alumina after thermal activation typically fails to reach 70% [8].
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In the process of ball milling, gangue particle size is continuously reduced by the three interaction effects of impact, ... Coal gangue (including bulk gangue and specific lithologies, such as ...
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Filling of gangue formed in coal mining is an effective means to realize green mining in coal mine. The key of gangue filling mining is to accurately understand the breaking mechanism and pore evolution of gangue under load. Therefore, in this paper, firstly, the yield criterion of granular materials based on radius of curvature and contact stress is built, which concluded that the change of ...
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Glassceramics with high strength and lightweight were developed by comprehensively utilizing coal gangue and clay. This work optimized the many processing parameters including the rate of using coal gangue, coal gangue to clay ratio, mineralizers, and process of forming and sintering. ... ballmilling and drying parameters of the mixtures, the ...
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Coal gangue, a solid waste generated during coal mining and washing, accounts for approximately 10%15% of the total coal production.
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Lanthanumcontaining magnetic zeolite (LMZ) was fabricated from coal gangue by an energetic ballmilling method followed by hydrothermal process. Careful morphological, structural, and magnetic investigations show that the LMZ sample has a typical NaA zeolite structure with an diameter of 150800 nm.
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Xueyang,, Add to Mendeley https://// Get rights and content • Facile onestep synthesis of coal ganguemodified biochar for the removal of phosphate. • Coal gangue modified oilseed rape straw biochar show the best adsorption performance. •
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The breakage and liberation of minerals are the key to fluidized mining for minerals. In the ball milling process, steel balls function as not only a grinding action implementer but also energy carrier to determine the breakage behavior of ores and the production capacity of the mill. When ground products present a much coarse or much fine particle size distribution, the separation process ...
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Coal gangue is one of the industrial solid wastes that may harm the human body through the ecosystem for a long time. Using coal gangue in geopolymer preparation can effectively reduce cement output and meet the sustainability requirements. In this paper, the physical and chemical characteristics, including the heavy metal content, of coal gangue from different producing areas are described.
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The activation process of coal gangue was optimized through orthogonal tests, and the BackPropagation (BP) neural network model was improved using a genetic algorithm. ... After ball milling, the coal gangue powder passing through the mm square hole sieve was thermally activated using a muffle furnace. After the activation, the coal ...
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In mining, gangue ( / ɡæŋ /) [1] is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit. It is thus distinct from overburden, which is the waste rock or materials overlying an ore or mineral body that are displaced during mining without being processed, and from tailings, which is ...
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Based on the problems of high carbon emission and high cost of traditional mining methods and filling materials, the tailings powder modified Coal Ganguebased Cementitious Backfill Material (CGCBM) was used for paste filling mining. In this study, the samples were prepared with different tailings powder content and different curing ages. The compressive strength test, XRD, SEM test, and NMR ...
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Published 28 Sept 2021 Abstract Coal gangue, an industrial waste, is rich in silicon and aluminum phase and may be used as a mineral admixture in concrete after moderately stimulating activity, allowing for efficient solid waste utilization.
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In the process of ball milling, gangue particle size is continuously reduced by the three interaction effects of impact, ... Zhang Y, Ling T C. Reactivity activation of waste coal gangue and its impact on the properties of cementbased materialsa review[J]. Construction and Building Materials, 2020, 234: 117424.
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The precise identification of damp, sticky coal gangue; efficient jet nozzle separation; and process layout in a narrow, restricted space are essential technologies for gangue source reduction based on underground gangue photoelectric separation, which is critical for the longterm growth of coal mines.
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Analysis of Influencing Factors of Gangue Ball Milling Based on Multifractal Theory Lei Zhu 1, Wenzhe Gu 2,*, Fengqi Qiu 1 and Peng Zhang 1 1 China Coal Energy Research Institute, Xi'an 710054 ...
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1. Introduction. Coal gangue is an industrial solid waste produced by coal mining and processing [13].The average production of gangue accounts for 1015% of raw coal production [4,5], making coal gangue one of the biggest solid wastes in present, utilization ratio of coal gangue can reach about 60% in some countries.
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The mineral of coal gangue is mainly kaolinite, which can be used as mineral admixture after activation. In order to study the effect of coal gangue on the hydration process of concrete, 20% coal gangue powder was used to replace cement to prepare concrete. The phase composition, microstructure morphology and pore structure of concrete hydration products at different ages were observed by X ...
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Design and implementation of coal gangue detection and recognition device. This study proposes an method for coal gangue detection and recognition on the basis of the DCNYOLOv3 algorithm. Firstly, the method collects realtime video images of a conveyor belt operation through an industrial camera erected perpendicular to the conveyor belt.
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In the process of coal resource mining and consumption utilization, a large amount of coal gangue solid waste is accompanied 1, present, the western mining area has become the main production ...
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