Coal gangue causes a series of environmental problems due to its low utilization rate and high amount of hoarding. However, the preparation of porous materials with coal gangue is an effective method of resource utilization. Mesoporous silica and mesomicroporous ZSM5 were prepared with alkali melting activationacid leaching and hydrothermal ...
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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 particle size distribution of coal gangue after ball milling is shown in Figure 2. The ground coal gangue can increase the specific surface area of the particles, significantly improve the gel activity, and facilitate the dissolution of the reaction process, which is the basis for the preparation of geopolymers. ... Future research will ...
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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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To reveal how CaF 2 improves the dissolution ratios of aluminum and iron ions in coal gangue, CaF 2 and hydrochloric acid are used to extract Al 3+ and Fe 3+ from the coal gangue calcined powder. The leaching ratios of Al 3+ and Fe 3+ are measured, and the filter residues are analyzed by BET, XRD, and SEM. The results show that adding 3% CaF 2 could increase the extraction ratio of Al 3+ from ...
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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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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 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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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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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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Scanning electron microscope (SEM) analysis was conducted to feature the micromorphology differences of the coal gangue during the fabrication process. As shown in Figure 2a, the crushed coal gangue after simple ball milling delivered the coexisting structure of the bulk and layered particles, ...
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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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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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Crushing, a form of comminution, one of the unit operations of mineral processing. In the field of extractive metallurgy, mineral processing is the process of separating commercially valuable minerals from their ores. [1] Depending on the processes used in each instance, it is often also known as ore dressing or ore milling .
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To study the heterogeneity and local heterogeneity of gangue particle size distribution (PSD) under ball milling, gangue from northern Shaanxi coal mine was taken as a research object. The multifractal pattern of PSD and the variation trend of characteristic parameters of gangue under different balltogangue ratios and grinding times were analyzed by introducing multifractal theory and ...
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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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Afterwards, the underlying mechanisms about the effects of calcined gangue and wet comilling on the hydration process, strength development and microstructure evolution of PESCM were explored and discussed in depth. ... Utilization of solid waste highvolume calcium coal gangue in autoclaved aerated concrete: Physicomechanical properties ...
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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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Abstract The amount of coal gangue, a byproduct of coal mining and washing, is rapidly increasing with the growing trend of energy consumption. The accumulated coal gangue without appropriate utilization has resulted in a squander of resources, waste disposal and environmental pollution issues.
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In order to further verify the generalization ability of MBCNN in coalgangue recognition during the process of top coal caving, according to Fig. 5, the coal and gangue caving as well as various ...
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Coal gangue, a solid waste of coal mining accounts for 1520% of coal production, when directly discharged on the ground surface as waste heaps, it occupies large areas of land and cause environmental pollution. This paper summarizes the existing gangue backfilling methods, their working principles, efficiency, and application status.
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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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It is meaningful to simultaneously convert gangue into inorganic material and gaseous fuel, and the destruction of rigid Al Si network of gangue is needed in this utilization process. It is found that the catalytic gasification of gangue with Na 2 CO 3 can effectively activate the minerals in gangue, and experimental results showed that the highest yield of aluminum extraction,, 92%, can ...
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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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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 (CG), which is mainly generated during coal excavation, mining, and coal washing, is an industrial solid waste that is recognized as an environmental pollutant. The everincreasing amount of CG produced is a serious threat to the ecological environment and property safety, especially in China, which is the largest coal producer and ...
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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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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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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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could activate coal gangue, and the composite activation effect was the best. e fineness of the coal gangue powder was more than 300 mesh, according to the optimal compounding method.
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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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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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