Red mud (RM) and coal gangue (CG) are two kinds of industrial solid wastes. The former is produced in alumina production, and the latter is produced in coal mining and processing [17,18]. Generally, these industrial solid wastes can be regarded as raw materials for preparing zeolite [6].
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Introduction of Coal Gangue. Gangue, also called coal gangue, is the solid waste discharged in coal mining process and coal washing process, black rock harder than coal. ... Winnermac gangue powder grinding machine, gangue crusher has many advantages like environmental protection and energy saving, Winnermac gangue grinding mill is applied for ...
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Coal gangue is a solid waste produced during coal production, and it accounts for 10%∼25% of the material produced in coal mining. China alone has accumulated more than 7 billion tons [5], [6], and accordingly, coal gangue is one of the mining solid wastes with the largest emissions in China.
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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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At this time, the activity rate of coal gangue powder reached the highest, which was %. ... grinding tank of the GMB/B ball mill with 3: 1. ratio of materials and steel balls, and the lid of ...
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Waste discharge and surface damage are the unavoidable consequences of coal mining. However, filling waste into goaf can help reuse waste materials and protect the surface environment. In this paper, it is proposed to fill coal mine goaf with ganguebased cemented backfill material (GCBM), while the rheological and mechanical performances of GCBM influence the filling effect. A method that ...
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Properties of coal gangue feed, especially its particle size distribution (PSD) and variable hardness, result in considerable impacts on both the efficiencies of the circulating fluidized bed (CFB) boiler and wastage of crushers. These two aspects are addressed in this study. First, the Aspen Plus software was used to optimize the coal gangue crushing system for the CFB boiler; it facilitated ...
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The mechanical activation of coal gangue in this study was carried out using a ball mill, and the mass ratio of steel balls to coal gangue was 5:1. After ball milling, the coal gangue powder passing through the mm square hole sieve was thermally activated using a muffle furnace. ... At 322~618 °C, the weight loss of coal gangue powder in ...
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At this time, the activity rate of coal gangue powder reached the highest, which was %. ... The ground powder was placed into the grinding tank of the GMB/B ball mill with 3 : 1 ratio of materials and steel balls, and the lid of the tank was sealed. The grinding tank was placed on the corresponding rubber shaft, the time was set to 30 min ...
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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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Coal ganguebased green cemented filling is to mix cement, CGP, coal gangue aggregate and water in mine filling according to a certain proportion, which can not only effectively solve the pollution problem caused by coal gangue discharge, but also improve the comprehensive utilization rate of coal gangue, but also effectively control mining site...
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In this paper, the coal gangue samples were activated at first, and then the coal gangue powder was modified by adding coal gangue powder to road asphalt with the ratio of and, and the ...
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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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The clay brick and powder recycled from construction and industrial waste may be utilized as recycled construction materials. To alleviate the negative environmental impact of the cement industry's CO 2 emission, waste clay brick was used as fine aggregate, clay brick powder (CBP), and coal gangue powder (CGP) were utilized as supplementary materials to partly substitute the cement.
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The coal gangue powder was calcined in a muff furnac e at a . ... crusher, ground by a small ball mill and calcined in a muffle furnace at 700 °C fo r 2 h (Figure 1). Figure 1.
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The coal gangue powder and aggregate were calcined with constant temperature in muffle furnace 700 °C for 2 h. Fig. 2 shows the particle size distribution of calcined coal gangue powder and slag powder. The median particle size d50 values of calcined coal gangue powder and slag powder were μm and μm, respectively.
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Coal gangue, a type of kaolinite clay in coal measures, is one of the largest categories of solid industrial wastes in China. Alumina extraction from coal gangue could offer an alternative to bauxite as a source of alumina. Mechanically modification by grinding is an effective activation method to improve alumina recovery from coal gangue.
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The characteristics of raw materials used in the test, such as cement, CGP and coal gangue, are shown in Table this experiment, the coal gangue produced by Zhang Jiamao coal mine in Shenmu City, Shaanxi Province is selected, and the XRD7000L Xray diffractometer was used to obtain the mineral composition analysis of coal gangue, activated CGP and cement and the gradation of fine ...
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Coal gangue is a mixture of a variety of rock and mineral composition with low carbon content. Normally, its calorific value increases with the increase of carbon mass fraction and volatiles, in contrast, decreases with the increase of ash. Because of the high content of SiO 2 and Al 2 O 3, the ash melting point of coal gangue is quite high ...
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Preparation of coal gangue ceramsites (CGCs) CG was first roughly crushed by a jaw crusher, then finely ground with a ball mill. The powder with a particle size of less than mm (200 mesh) was obtained through standard screening for experimentation.
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Coal gangue is a kind of solid waste produced in the coal mining and preparation. Abundant SiO 2 and Al 2 O 3 are contained in coal gangue, which has potential cementitious activity. Therefore, the preparation of cementitious materials from coal gangue powder has broad application prospects.
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1 Coal gangue is crushed by a jaw crusher and ground by a ball mill. Raw materials are screened using a 100mesh vibrating screen . 2 Mix raw materials (55% coal gangue and 45% iron tailings) to make particles with a diameter of 1020 mm. 3 Put the formed CGC into a dryer, heat to 105°C, and dry for 12 hours.
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The coal gangue is one of the most abundant industrial solid wastes and ... ground them up to 200 meshes in the mill. 3 ... Grouting test specimen preparing Coal gangue powder (600 ~ 700 calcined and fine grinded), cement, aggregate, expansive ℃ agent and additives were blended together after weighing to get the dry mixtures. The water ...
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The environmental and economic problems caused by gangue accumulation continue to worsen. Therefore, the implementation of a costeffective method for utilizing gangue resources is urgent. In this study, different gangue powder (GP) contents (0%, 10%, 20%, 30%, 40%, and 50%) for mechanicalthermal activation were used to modify a fly ashbased geopolymer (FAG). Further, the effect of GP was ...
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1. Recovery of coal and pyrite: Through a simple process, good coal is washed from coal gangue, lowquality coal is selected from it through screening, and pyrite is selected at the same time. Or recover pyrite, mixed coal and middling coal from the jig used for coal preparation ─ ─ plane shaker process.
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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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