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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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. 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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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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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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Methods and Mechanical and thermal activation. Coal gangue samples were initially crushed using Jaw crusher (PE60X100), then ground using a planetary mill (QM3SP2) and sieved to 60100 mesh ( mm) to obtain Asreceived samples then ground using a planetary mill (QM3SP2) continually for 2 to 20 h at a 35 Hz rotational speed to obtain ...
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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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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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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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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.
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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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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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Traditional Coal Gangue Separation Process and Equipment. Water washing and dry coal preparation are the main parts of coal preparation. Spiral separation, jigging, heavy medium separation, and other processes are water washing processes, which have the advantages of mature technology, high separation accuracy, and large processing capacity (Majumder, Barnwal, and Ramakrishnan Citation 2004).
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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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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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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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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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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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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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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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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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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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