— Coal gangue (CG) is a rock associated with or symbiotic with coal during the formation process of coal resources and discharged as a byproduct by coal mining or separation, which accounts for 10–15% of …
— However, coal gangue can still be used for both electricity and heating. As a partial substitute of coal, it also can ease the shortage of coal resources. Due to the huge production of coal gangue, there are large quantities of coal gangue left every year (Long et al., 2019). The disposal of coal gangue causes serious environmental problems.
— The calorific value of coal gangue refers to the amount of energy that can be released from complete combustion of coal gangue per unit mass under certain conditions, and it usually increases with increasing carbon mass fraction and volatile fraction and decreases with increasing ash fraction [24].The meltability of coal gangue refers to the …
— Abstract Among coal mining-related wastes, coal gangue (CG) is the heterogeneous waste generated during the mineral processing or coal washing phase of coal mining. A thorough understanding of environmental concerns associated with the current model of ...
— LC 3-50 with 15% calcined gangue and 30% limestone was proved to give equivalent 28-day and 90-day compressive strength when compared with reference …
— After calcination, the larger particles of 0–1 mm coal gangue became smaller and there was an increase in smaller particles, the XRD diffraction peak of kaolinite disappeared. Under water-cement ratios of 0.4 and 0.7, the compressive strength of cement mortar with calcined coal gangue was significantly higher than that without calcination at ...
— Hg exhibited different characteristics in its mean concentrations than Cd. The highest mean concentration (0.1 mg/kg) was found in coal gangue, whereas soil and diorite samples had low mean concentrations (0.02 mg/kg and 0.01 mg/kg, respectively). High Hg concentrations (0.3 mg/kg–6.3 mg/kg) in coal gangue were also found by Niu et al. (2017 ...
— The utilization of calcined coal gangue (CCG) and limestone for the preparation of blended cement is an efficient approach to address the issue of coal gangue disposal. However, the compressive strength …
The results state that there is the different optimum temperature for the different coal gangue. For most coal gangues, the optimum activated temperature is 800. The 28days compressive strength of mortar with activated coal gangue can be increased when calcining coal gangue with a certain limestone. The structure of calcining coal gangue and ...
— Liu et al. [26] studied the effect of coal gangue with low kaolinite content on the mechanical properties of cement, and the results showed that for binders with Calcined coal gangue and limestone ...
— Global rise in greenhouse gas emissions (GHG) is triggered mainly due to the consumption of fossil fuels for power generation and domestic usage. Among the fossil fuels, coal is a primary contributor to global GHG with substantial emissions generated during its mining and combustion process. Coal gangue, a residue produced during the …
— Coal gangue with calorific value of 6270 kJ kg −1 - 12550 kJ kg −1 can be directly used as boiler fuel without sorting, and coal gangue with calorific value of 4180 …
We investigated the possibility of recycling and recovery of Moroccan coal gangue (coal mine of Jerada). The analysis of the waste showed that it is formed essentially of silica and clays. We were interested to elaborate a Portland clinker from mixtures composed of limestone and coal gangue. A preliminary study was focused on the optimization of the …
— However, compared to natural aggregate, the strength of coal gangue aggregate (CGA) is much lower, and its interfacial bonding in concrete is weaker. This paper studies the effect of calcination processes at 450 °C and 750 °C on the mineral and chemical compositions, microstructure and suitability of coal gangue as aggregate in …
Coal gangue is one of the largest mine solid wastes in China, and its discharge and stockpiling have caused resource waste, environmental pollution and other problems. Starting from the resource characteristics of coal gangue, this paper systematically discusses the ways and research status of coal gangue resource utilization, mainly …
— Coal gangue occupies large swathes of land resources, resulting in ecological fragility and various environmental problems. ... There was a 35 cm distance from the bottom of the lamp to the ...
— The mineral composition of raw coal gangue and calcined coal gangue is shown in Fig. 2. The main components of raw coal gangue were kaolinite and quartz. There was also a small amount of muscovite in it. The XRD curve of calcined coal gangue indicates quartz became the primary mineral, and the kaolinite peak disappeared clearly.
— Coal gangue (CG) is a rock associated with or symbiotic with coal during the formation process of coal resources and discharged as a byproduct by coal mining or separation, (1) which accounts for …
— 1. Introduction. Coal gangue, a waste produced during coal mining, has been regarded as the largest source of industrial waste in China. It is estimated that the production of 1 t coal generates 0.1–0.25 t coal gangue [1], and the total stockpile of coal gangue exceeds 6 billion tons in China [2], [3].The coal gangue not only occupies …
— Coal gangue (CG) is a type of industrial solid waste produced by the process of coal excavation and separation 1,2,3.Generally, one ton of CG is discarded for every 10 tons of produced coal 4,5. ...
— Influence of kaolinite content in coal-series metakaolin and soft metakaolin on the performance of cement blends with and without limestone. ... However, a significant …
— 1. Introduction. Coal has been the primary energy source in China for decades [1].The annual production of coal in China alone reached 38 billion tons in 2015 [2], accounting for about 47% of global production [3].For one ton of coal produced, about 100–150 kg of coal gangue is generated from coal excavation, mining and washing …
— In mining areas where gangue is used for infill mining, Ordovician limestone karst water is affected by discarded gangue, and the water quality changes significantly. In this study, the effects of gangue on water quality change under different immersion solution conditions were evaluated by Zhai Zhen Coal Mine, Hongqi Coal Mine Ordovician …
— The optimum composition ratio of the coal gangue planting substrate is as follows: coal gangue-to-soil ratio of 1:1 (500 g:500 g), maize straw content of 50 g kg −1, fly ash content of 37 g kg −1, and water retention agent content of 1 g kg −1. The results could provide a theoretical and technical basis for coal gangue ecological ...
— Coal gangue image recognition is a critical technology for achieving automatic separation in coal processing, characterized by its rapid, environmentally friendly, and energy-saving nature. However, the response characteristics of coal and gangue vary greatly under different illuminance conditions, which poses challenges to the stability of …
— To gauge the feasibility of using coal gangue for geotechnical and geoenvironmental applications, comprehensive characterization study was performed …
— The acid pollution produced from coal gangue piles is a global environmental problem. Terminal technologies, such as neutralization, precipitation, adsorption, ion exchange, membrane technology, biological treatment, and electrochemistry, have been developed for acid mine drainage (AMD) treatment. These …
— The different results between FGLU and FGU also showed the minerals of the limestone powder (mainly referring to carbonates) have a good buffer effect on the dissolution of coal gangue in water, …
Keywords: Ordovician limestone karst water; Weathered coal gangue; Water pollution; Filling mining 1. Introduction Coal gangue is harmful solid waste generated during coal production and processing and after the closure of coal mines. According to statistics [1], there are more than 1,500 coal gangue hills in China, which accumulated exceeded
transform to suppress the speckles in the gangue images, to enhance edges, because the coal gangue images were always contaminated with speckles of coal dust [8]. Ma and Zang suggested a novel image processing method for separating gangues from coal with wavelet analysis. The Haar wavelet was used to reduce high fre-quent noises of gangue images.
— Introduction. Coal gangue (CG) is a type of industrial solid waste produced by the process of coal excavation and separation 1, 2, 3. Generally, one ton of CG is …
— A large amount of coal gangue buildup may be a potential fire hazard associated with the heat released by microorganisms accumulating to the point of spontaneous combustion in the presence of unburned coal, pyrite (FeS 2) and oxygen.Coal gangue is likely to cause large-scale fire and blast disasters, and produce a significant …
