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 ...
The results show that a cement content of 4% is optimal for the cement stabilized coal gangue, which can be used for the light traffic base and heavy traffic subbase of class II and below highways ...
Semantic Scholar extracted view of "Safe and environmentally friendly use of coal gangue in C30 concrete" by Chao-qiang Wang et al.
Coal gangue, a by-product produced during the coal processing, has a serious impact on the environment. Using coal gangue as a fertilizer has been proven helpful in potentially reducing its environmental impact and improving its value. In this study, the formation mechanism and influencing factors of coal-gangue-based silicon fertilizer …
Top coal caving is a process for the rational extraction of large amounts of coal resources. However, this process readily causes release of excessive amounts of gangue during the coal release process. The conventional technique, which involves visual inspection, is not only labor-intensive but also can introduce inaccuracies. Coal and …
The feasibility and performance of using calcined coal gangue (CCG) to substitute metakaolin (MK) as the precursor to prepare alkali-activated materials (AAMs) were thoroughly evaluated by conducting combined experiments of flowability test, mechanical measurement, calorimetry and microstructure analysis, etc. It was found that …
Starting from the resource characteristics of coal gangue, this paper systematically discusses the ways and research status of coal gangue resource utilization, mainly including: extracting and recovering useful …
Using coal gangue as a fertilizer has been proven helpful in potentially reducing its environmental impact and improving its value. In this study, the formation …
The impact of coal gangue may stem from its higher carbon content, although the carbon content of the gangue used in this study was lower than that of ordinary gangue, reaching 4%. This value far exceeded the local soil background level and reached the index level of high-fertility soil, which affected the determination of organic …
Industrial solid waste coal gangue (CG) is used as the research object, and the mechanical activation-water washing pretreatment method was used to explore the feasibility of carbon removal by water washing and the improvement and microscopic mechanism of the treatment process on the cementitious activity of CG. The mechanism …
Gangue refers to waste rock discharged during coal mine construction, coal mining, etc 1.Excessive accumulation of coal gangue will cause serious environmental problems 2,3,4.At present, the coal ...
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 …
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 …
Coal gangue has accumulated huge coal gangue piles, occupying lots of land as well as having striking influence on the neighboring environmental effects. This paper seeks a new way of coal gangue treatment in which the coal gangue blended with shale and sludge was sintered in rotary kiln to form lightweight aggregates.
This paper provided a comprehensive review of various modification methods (including mechanical, chemical, microbiological, thermal, hydrothermal and composite …
Coal gangue is one of the largest discharged industrial solid wastes, which is generated in the processes of coal mining and washing. To accelerate the in-situ utilization of coal gangue, this paper explored coal gangue aggregates (CGA) as the single aggregate source to prepare shotcrete used for coal mine tunnel underground in local.
The reuse of coal gangue for energy recovery is developing rapidly in China, due to its advantage in achieving both economic and environmental benefits. Low-quality coal is often added to elevate the calorific value of the fuel. In this paper, the combustion characteristics as well as pollutant emissions (SO2 and NO) of coal …
Coal gangue, a solid waste generated during coal mining and washing, accounts for approximately 10%–15% of the total coal production. The accumulative …
ABSTRACT. A greenhouse pot experiment was conducted to investigate the effect of application of coal gangue (CG) at different rates (0, 5, 10, 20, and 50%) and inoculation with two arbuscular mycorrhizal (AM) fungi Glomus intraradices and Glomus mosseae, as mediating plant adaptation to soil amended with CG, on the nutrient content of forage …
After physical activation, coal gangue is used in geopolymer preparation with a chemical activator (alkali excitation agent), which effectively forms a three-dimensional silicon aluminate polymer network. The pore structure is dense, the physical fixation and chemical bonding are strengthened, and the solidification and adsorption of …
The MSI system for coal and gangue recognition is illustrated in Fig. 2, which consists of a light source and a spectrometer.The light source device is LS-LHA produced by SUMITA OPTICAL GLASS, Inc ...
The persistent reliance on coal has resulted in the accumulation of substantial coal gangue, a globally recognized problematic solid waste with environmental risks. Given the coal gangue properties and global land degradation severity, the resourceful utilization of coal gangue as soil conditioners is believed to be a universally applicable, cost …
With the development of China's coal industry, coal gangue has become one of the most extensive solid wastes.The collection of soil from other places for land reclamation has become a commonly used technology for ecological restoration of coal-mining areas in China. The purpose of this study was to use coal gangue as a new type …
In the construction field, coal gangue has also been used to make bricks, concrete blocks, mosaics, fired-glazed floor tiles, lightweight aggregate and other low value-added building materials [8], [16], [17].At present, coal gangue can partly or completely replace clay for aluminum adjustment in cement clinker production [18], [19]. In fact, the …
Using coal gangue (CG) as raw material, a new type of all solid-waste-based 13-X molecular sieve material was controllably prepared by alkali fusion-hydrothermal method. The synthetic molecular sieve was used as a solid adsorbent to treat Cd2+-containing wastewater, and its adsorption behavior on Cd2+ in aqueous solution …
CGRPC-G uniformly used the cleaned coal gangue in coarse and fine aggregate, CGRPC-S used the 0–4.75 mm river sand as the fine aggregate, and CGRPC-D used the dried coal gangue in both aggregates. The dried coal gangue's internal natural water had been removed by the sun because, at the job site, the prepared coal gangue …
In the coal mining stage, diesel, heat and electricity are consumed, and raw coal, CO 2, CH 4 and solid waste are produced and discharged. The inputs of the washing stage mainly include raw coal from coal mining, diesel and electricity, and the outputs mainly include coal, coal gangue, CO 2 and solid waste. The power generation stage is …
The coal gangue was crushed and processed into three particle-size ranges: fine gangue (0–5 mm), medium gangue (5–10 mm), and coarse gangue (10–15 mm). The. Radon concentration. The cumulative radon concentrations in the raw materials are shown in Figure 7. Figures 7 (a), (b), (c), and (d) show that there is little difference in the peak ...
In most of the studies on coal gangue concrete from the aspect of material, 50% coarse aggregate replacement ratio was commonly used as the maximum replacement ratio whilst coarse aggregate replacement ratio was also investigated by some researchers [8].Since the aim of this study is to maximize the application efficiency …
Coal gangue has become one of the industrial wastes with the largest annual discharge and accumulated stock in China. The disorderly accumulation of coal gangue not only occupies a large amount of land resources and causes natural disasters, but also pollutes the surrounding ecological environment, which in turn affects human …