آخرین محصولات
How to Recycle and Process Coal Gangue: 7 Effective Ways
4. Preparation of calcined kaolin from coal gangue The preparation of calcined kaolin from coal gangue is an important direction for high value-added utilization of coal gangue. The finished product is ultra-white kaolin, a key component in ceramics, paper, and coatings. Not all coal gangue can be calcined to produce kaolin.
Utilization of coal gangue and copper tailings as clay for …
In order to avoid environmental pollution from Coal gangue (CG) and copper tailings (CT), the utilization as cement clinker calcinations was experimentally investigated. Low-calcium limestone was also selected as another raw material. The clinker component and microstructure were analyzed by XRD and SEM. The experimental …
Underground Disposal of Coal Gangue Backfill in China
China's total coal production in 2021 exceeded 4.13 billion tons, 52% of the world's total. Coal gangue, a solid waste of coal mining accounts for 15–20% 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 …
Comprehensive utilization and environmental risks of coal …
The amount of coal gangue, a by-product of coal mining and washing, is rapidly increasing with the growing trend of energy consumption. The accumulated coal …
Study on the influence law of gangue filling structure on the …
The extensive accumulation of coal gangue not only consumes vast tracts of land but also poses severe environmental challenges, including soil contamination, air pollution, and geological hazards (Li and Wang, 2019). Gangue filling mining is one of the effective ways to promote sustainable green production and prevent coal mine gas …
Sustainability Benefits of Utilizing Coal Gangue as Fill …
Recent research has established coal gangue (CG) utilization (a mining waste generated during the mineral processing stage of coal mining) as a fill material in earthworks. Further, the earlier researchers have also identified the environmental benefits of reduced carbon emissions attainable through its utilization in earthworks.
Multiscale experimental analysis of marine clay …
Request PDF | Multiscale experimental analysis of marine clay stabilized with coal gangue–calcium carbide residue geopolymer | An eco-friendly way to improve the engineering properties of lower ...
Road Performance Evaluation of Unburned Coal Gangue in …
At present, the cumulative storage of coal gangue in China exceeds 7 billion tons, covering an area of approximately 70 km2. The engineering application of unburned coal gangue is mainly utilized as concrete aggregate or cement production after the overfire process. However, it is prone to environmental pollution and has limited …
Carbon Footprint Analysis of Coal Gangue in …
coal gangue, the naturally occurring soil meeting the turf- ... Further, low permeable clay layer is provided at the bottom of embankment to arrest possible leaching of trace elements from coal gangue [33]. For the construction of a 1 million m3 of embankment, 125,000 m3 of clay and 56,000 m3 of turfing material are procured to meet the design ...
Hydration mechanism of limestone calcined clay cement …
2.2. Experiment procedures2.2.1. Thermal treatment. The treatment process for the original coal gangue involves three sequential steps: (1) the raw coal gangues were crushed to achieve a size of no more than 20 mm; (2) the crushed coal gangue powder underwent a 24-hour high-temperature drying phase at 80°C until it reached a constant …
Identification and Activation of Coal Gangue and …
Coal gangue is a rock mixed with organic and inorganic compounds co-deposited with coal during coal formation. Usually in a thin layer and in the coal seam or in the top and bottom of the coal seam, gangue is typical solid waste discharged when coal is excavated and washed in the production. ... The clay is a typical kaolin clay with around …
Processes | Free Full-Text | Activation of Low-Quality Coal Gangue
Although the calcination-based activation of coal gangue is important for its valorization in the form of cementitious materials, the related works mainly focus on high-quality coal gangue, neglecting its low-quality counterpart. To bridge this gap, we herein conducted the pilot-scale suspension calcination of low-quality coal gangue; explored …
Occurrence of Iron in the Minerals of Carboniferous Coal Gangue …
In coal gangue, the Fe was found to occur in ferruginous minerals, in crystal-lattice substitutions, or in a colloidal state. The ferruginous minerals in the coal gangue are pyrite and marcasite, and the pyrite morphologies are framboidal, euhedral octahedral crystals, subhedral granular crystals, and irregular crystals.
Utilization of Coal Gangue and Copper Tailings as Clay …
Coal gangue (CG) is an industrial residue when coal is excavated and washed in the production course of coal mine, and it has become the largest solid waste in China[1-4]. Metal tailing is an industrial waste for metal mine after mining, crushing, flotation. China is abundant in copper tailings (CT) and other metal tailings[5,6]. However, most ...
Excess sulfur and Fe elements drive changes in soil and
Coal mining is indispensable due to the widespread use of coal, and gangue is the accumulated solid waste byproduct that persists in mined lands, even after the mines have been abandoned 1.In the ...
Analysis of coal gangue recognition capability based on …
Meanwhile, coal gangue recognition capability is summarized, which provides theoretical support for the vibration characteristics-based coal gangue recognition. Secondly, through analysis of fully mechanized caving environment, a single coal drawing experimental platform and vibration information acquisition system are designed and built in the ...
Recycling of Moroccan coal gangue in the elaboration …
from the combustion of coal residues contained in the gangue. Keywords: coal gangue, recovery, clinker, hydration. Introduction The total world production of coal, including past and future production, is estimated at about 680 Gt [1]. Unfortunately coal production is accompanied by large amounts of solid waste estimated between 15 and 20% [2].
[PDF] Analyzing the identification mechanism of graphite and clay …
DOI: 10.37190/ppmp/143815 Corpus ID: 243948910; Analyzing the identification mechanism of graphite and clay minerals in coal and gangue using X-rays @article{Yin2021AnalyzingTI, title={Analyzing the identification mechanism of graphite and clay minerals in coal and gangue using X-rays}, author={g Yin and Hongzheng …
Analysis of characteristics of diffusion tortuosity of fine …
The diffusion characteristics of fine-grained gangue slurry are significant for gangue consumption and ecological environment protection, especially in underground mines. Therefore, based on the theory of porous medium transportation, this paper establishes a 3D caving zone model, proposes methods for reconstructing, statistical, …
Hydraulic conductivity and multi-scale pore structure of …
Hydraulic conductivity of polymer-enhanced bentonite geosynthetic clay liners to coal gangue leachate. ... Environmental Technology & Innovation. 2024; 1. Save. Hydraulic conductivity of bentonite-polymer geosynthetic clay liners to aggressive solid waste leachates. Dong Li Hanrui Zhao Kuo Tian. Environmental Science, Materials …
Environmental hazards and comprehensive utilization of …
By advancing comprehensive methods for coal gangue utilization, we not only transform coal gangue from solid waste into a valuable resource, maximizing its …
Excess sulfur and Fe elements drive changes in soil and
The results suggested that coal gangue significantly influences soil S, pH and plant species after 8 years of natural recovery. The CK-far plots contained relatively …
Multiscale experimental analysis of marine clay …
clay was classified as lean clay with sand. The surface morphologies of marine clay are shown in Fig. 2. The marine clay exhibited a rough and clustered structure with irregular shapes and porosities. The chemical composition of marine clay analyzed using X-ray fluorescence is pre-sented in Table 2. SiO 2 and Al 2O 3 were the two dominant
Mechanical Properties of Coal Gangue Used as Subgrade …
The results show that the addition of clay to the coal gangue in certain proportion can increase the content of fine particles as well as intensify the discontinuous distribution of particle ...
Thermal effect on fluorine emission in coal and clay minerals …
Fluorine in coal is important because of not only its association with indicators of mineralization, but also environmental concerns relevant to the health of plants, animals and humans. In order to analyze the fluorine emission characteristics, this paper summarizes the laboratory data from a number of Chinese literatures of fluorine …
Multiscale experimental analysis of marine clay stabilized with coal …
An eco-friendly way to improve the engineering properties of lower-strength soils becomes attractive. This study investigates the feasibility of two industrial by-products, i.e., coal gangue (CG) and calcium carbide residue (CCR), as a sustainable CG–CCR geopolymer binder for soil stabilization. The geomechanical properties, compressibility, …
Study on mechanism and kinetics of iron removal by …
Utilizing the abundant kaolin resources within coal gangue is economically beneficial, although the iron-containing phase in the minerals hampers the value of its utilization. In the present study, CaCl2 served as the chlorination agent for iron removal from coal gangue through chlorination roasting. The study revealed that when the roasting temperature is …
Preparation and characterization of coal gangue geopolymers
DOI: 10.1016/J.CONBUILDMAT.2018.07.220 Corpus ID: 139677340; Preparation and characterization of coal gangue geopolymers @article{Cheng2018PreparationAC, title={Preparation and characterization of coal gangue geopolymers}, author={Yi Cheng and Ma Hongqiang and Chen Hongyu and …
Utilization of coal gangue and copper tailings as clay for …
Qiu et al. (2011) investigated the utilization of coal gangue (CG) and copper tailings (CT) as clay for cement clinker calcinations and found that the calcination time was shortened and the ...
Using Chinese Coal Gangue as an Ecological Aggregate and …
Clay coal gangue is one of the most commonly used coal gangue aggregate concretes. It has high SiO 2 and Al 2 O 3 content, layered structure, and can produce activity under certain conditions. Figure 4 shows the X-ray diffraction (XRD) patterns of coal gangue calcined at different temperatures. It can be seen that kaolinite …
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