It is crushed into gangue particles with a maximum particle size of less than mm by the secondary jaw crusher. The crushed coal gangue is screened and analyzed, as shown in Figure 2, and it is found that the content of particles larger than mm in the crushed coal gangue is only %. After further sieving analysis of particles ...
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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 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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Consequently, the coalgangue recognition, i. e, detect the instantaneous refuse content of drawn coal and gangue mixture during top coal caving process, should be researched to realize the ...
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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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The calorific value of the coal gangue was increased from about 1500kcal/kg to 4800 kcal/kg by the separation process. And about 30% product yield was obtained by the separation process. The product was used as steam coal which increased the revenue of the coal preparation plant and improved resource utilization. Conclusions
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Large pieces of coal gangue were selected to fill the pond until the fill height was at the surface of the water. Ordinary coal gangue was used to fill the pond with a bulldozer until the height reached the design elevation + m ( m for the expected settlement). The coal gangue was rolling compacted during the filling process .
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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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Using coal gangue (CG) as supplementary cementitious materials (SCMs) is believed to be one of the effective strategies for CG disposal. ... 60, and 120 min, respectively. This evidences directly the effect of the wetmilling process that the pozzolanic reactivity of CG was enhanced after wetgrinding. Download : Download highres image (573KB ...
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1. Coal gangue replaces clay to make cement The chemical composition of gangue mineral is similar to that of clay, and it can partially or completely replace clay to produce cement. The selected coal gangue is mainly muddy rock, with as little sandstone content as possible.
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This study aims to discover an effective method for implementing an autoclaved process for the preparation of environmentally friendly and lightweight building materials, such as autoclaved aerated concrete (AAC), with the goal of reusing solid waste and reducing the environmental hazard associated with highcalcium coal gangue (HCCG).
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Under normal circumstances, the coal gangue is massive, so coal gangue must be pretreated before in the preparation of porous ceramics. Including crushing, ball milling, sieving, acid leaching and other processes. This is to remove impurities from coal gangue and to improve the efficiency of the reaction.
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Contribute to dinglei2022/en development by creating an account on GitHub.
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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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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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Coal gangue crushing production line process and equipment configuration. Coal gangue crushing production line process and equipment configuration. Skip to content. ; info; gongyi city, henan province, China; Search. Search. Close this search box. Jaw Crusher; Cone Crusher; Sand Making Machine; Hammer Crusher;
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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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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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After the ballmill grinding and calcination, CG powder particles are dense and smooth at the surface, with pores and prismatic shape. After heating, calcined CG powder becomes an irregular and porous structure, which may be caused by kaolinite hydroxylation and the phase change of the metakaolin. ... Preparation Process of Coal Gangue Powder ...
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The results of the proximate analysis of coal gangue and the ash composition are listed in Table amounts of SiO 2, Al 2 O 3, and Fe 2 O 3 account for %, %, and % in the ash of coal gangue. Moreover, other impurities, such as TiO 2, MgO, and CaO, are also observed in small sum of the percentages of SiO 2 and Al 2 O 3 accounts for % of the total ash ...
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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. La 3+ ions and Fe 3 O 4 evenly distribute ...
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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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Coal gangue; glassceramics; forming process; sintering process; property 1. Introduction Glassceramics are widely used as machinable cera ... further wetmilling for 12 min, the slurry was sifted with 80 mesh sieve (Aperture: mm, ASTM), leaving the residue of ~% over the sieve. The fine pow
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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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Coal gangue, as a byproduct of coal mining, selection, and excavation, can cause severe air pollution by spontaneous combustion. At present, ... To observe whether the wet comilling process could effectively refine particles and improve particle size gradation, the particle size including raw materials and fresh pastes was measured using ...
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Taking kaolinite as an example, A novel process to prepare aluminumsulfuric acid coagulant is examined by the highenergy ball milling activation of Coal gangue, followed by cogrinding with concentrated sulfuric acid, instead of the traditional hightemperature activated acidalkali process. The prepared coagulant is characterized by Xray diffraction (XRD), transmission electron microscope ...
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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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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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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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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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The results indicate that in the process of "jaw crushingball milling", gangue's particle size and shape fractal dimension values changed periodically. During the jaw crushing stage, the particle size fractal dimension increases with the width of the discharge opening, ranging from to
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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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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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Herein, gangue is the waste in the coal mining and washing process. In this study, the gangue was crushed to 0 ~ 15 mm. Fly ash is the waste that remains after coal combustion. Its particle size was 550 µm, and the particle size was mostly concentrated in the range of 1020 µm.
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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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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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