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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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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When. alkaline dry powder or sodium hydroxide solution wa s used as an activator, the compressive. strength and flexural strength of coal gangue concrete we re % and % higher, 171. 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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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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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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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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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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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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1. Introduction. In coal mining, gangues which are piled up on the surface after discharge pose a threat to the environment around mining areas [1], [2], [3], [4].Coal mining by solid backfill mining technology, as a green mining method was proposed to solve problems such as pressed coal and gangue deposition presented by traditional mining technologies [5], [6], [7].
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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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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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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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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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Along with the excavation and washing of coal in the production process, large amounts of rocklike coal gangue (CG) accompanying the carboniferous beds are discharged as industrial residues, accounting for around 1020% of the coal production [2,3,4].In the largest coal production country, namely China, more than 700 million tons of coal gangue was expected in 2020, with the annual rate of ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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