Low-carbon utilization of coal gangue under the carbon …
The treatment and utilization of coal gangue, one of the main solid wastes produced during coal mining, are of great significance in environmental protection and resource development. In the contemporary context of the carbon neutralization strategy, due to the property of the carbon in coal gangue, it is necessary to be cautious of the …
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Kinetics of alumina extraction from coal gangue by …
The leaching kinetics of alumina extraction from coal gangue with hydrochloric acid was investigated. ... at a calcination temperature of 700 °C [24]. The dissolution rate of alumina can be greatly improved by adding limestone during calcination; furthermore, sodium carbonate can react with coal gangue to form nepheline during …
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Influence of Lime and Coal Gangue on the CBR Behavior of
The TM and SM values increased with coal gangue addition in both control and lime treated case and increase is proportional to the CBR values. The MR values of …
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Influence of coal gangue mulching with various thicknesses …
Overall, to enhance the soil water storage capacity in mining areas, the results suggest that coal gangue mulching with a thickness of 8–16 cm and particle size …
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Thermal Activation of High-Alumina Coal Gangue Auxiliary …
In this paper, a new preparation technology is developed to make high-alumina coal gangue (HACG) auxiliary cementitious admixture by calcining HACG–Ca(OH)2 (CH) mixture. HACG powders mixed with 20 wt.% CH were calcined within a temperature range of 600–900 °C, and the thermal transformation and mineral phase …
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Identification and Activation of Coal Gangue and …
Gangue, a typical waste associated with the coal mining process in northern China, was characterized before and after thermal treatment by XRF, XRD, TGA-DSC, and SEM. The pozzolanic reactivity of calcined gangue with different calcined temperature was tested by standard mortar strength and R3 calorimetry test. The performance of blended cement …
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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 …
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Separation of gangue from coal based on supplementary texture …
The separation of coal and gangue is an important aspect of coal production, which can improve coal quality, save energy, reduce consumption, and enable the rational use of resources. At present, manual selection remains widely implemented, but the working environment is harsh, labour intensity is high, and efficiency is low.
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2019 Minerals Yearbook
2019 Minerals Yearbook. OMAN [ADVANCE RELEASE] U.S. Department of the Interior U.S. Geological Survey. February 2023. The Mineral Industry of Oman. By Philip a. …
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Minerals | Free Full-Text | Experimental Investigation into the
It is expected that cemented aeolian sand-coal gangue-fly ash backfill (CACFB) will play a role in boosting the green development of urban agglomeration along the Yellow River, Yulin City, northern Shaanxi [1,2,3,4,5,6].Yulin City is located at the southern edge of the Maowusu Sandy Land and is one of the national land …
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Optimizing the formulation of coal gangue planting …
Semantic Scholar extracted view of "Optimizing the formulation of coal gangue planting substrate using wastes: The sustainability of coal mine ecological restoration" by T. Du et al. ... Over the past few decades there has been avid interest in developing the strategies for the utilization of Fly ash (FA). Major foci have been on its ...
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Novel Methods for Separation of Gangue from Limestone …
Results showed that the accuracy for separation of gangue from limestone, a joint color-texture method was 98 % and for separation of gangue from coal, …
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Water | Free Full-Text | Effects of Coal Gangue on the …
At present, many scholars have conducted much work on water pollution caused by wastewater discharged from the mining area [20,21], but there is less research on the water pollution caused by backing mining, especially the impact of coal gangue on the quality of Ordovician limestone karst water . The main purpose of this research was …
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Heavy Metal Concentrations of Soil, Rock, and …
Limestone ranked second when considering the sum value (3.84), followed by mudstone (2.86) > shale (2.56) > coal gangue (2.19) > sandstone (1.86) > granite (1.61) > diorite (1.21). The normalized values …
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(PDF) Recycling of Moroccan coal gangue in the elaboration …
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 composition of the mixture ...
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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 …
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(PDF) Recycling of Moroccan coal gangue in the …
2. Materials and methods 2.1. Raw materials and mixtures It is proposed to develop clinkers from mixtures of limestone and coal gangue. - Limestone from a cement plant denoted L (lime). - The gangue (sterile) …
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Comprehensive utilization and environmental risks of coal …
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 kJ kg −1 - 6270 kJ kg −1 should be sorted first and then desulfurized with limestone (Li et …
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Assessment of heavy metal in coal gangue: distribution, …
Suncun coal mine (35° 52′ N, 117° 40′ 46″ E) is located in Tai'an city in Shandong Province of China. The coal mine has a long history of mining of more than 100 years; many huge gangue hills have been left there. A coal gangue hill about 60 years old has been excavated to reuse gangue in bricks making, road paving, and cement …
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The Properties and Hydration of a Calcined Coal Gangue-Limestone …
Results show that the optimum thermal-activation temperature of coal gangue is 800°C: the coal gangues in Yangquan, Huozhou, and Xinzhi, China, had higher activity and the replacement level of ...
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Comprehensive Extraction of Silica and Alumina from High-Alumina Coal
The International Energy Agency reported that the energy used in the world for electricity generation is still mainly from coal fuel [].Coal gangue, which is generated during coal mining and washing, is one of the largest industrial waste products with an output of 10 − 15% of the total coal production [2, 3].The coal production worldwide in …
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Sustainable and clean utilization of coal gangue: …
coal-gangue-based silicon fertilizer, and its reliability veri-ed, thereby providing a theoretical basis for use of coal-gangue-based silicon fertilizer in agriculture. Materials and methods Materials Coal gangue The coal gangue used in the experiment comes from the Shendong mining area in Inner Mongolia, China, with an ash content of~ 85.60%.
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Novel Methods for Separation of Gangue from Limestone and Coal …
The associated gangue minerals from limestone and coal mines were identified using three different approaches. All the methods were based on extensions of the co-occurrence matrix method. In the first method, the color features were extracted from RGB color planes and texture features were extracted using a multispectral extension, in …
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Life cycle energy use efficiency and greenhouse gas …
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.
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Novel Methods for Separation of Gangue from Limestone and Coal …
The associated gangue minerals from limestone and coal mines were identified using three different approaches. All the methods were based on extensions of the co-occurrence matrix method. In the first method, the color features were extracted from RGB color planes and texture features were extracted using a multispectral extension, in which co ...
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Properties and Microstructure of an Interfacial Transition …
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 total raw coal production. At present, the accumulation of CG in China alone exceeds more than 7 billion tons, with 300–350 …
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Optimizing the formulation of coal gangue planting …
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 ...
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Minerals | Free Full-Text | Preparation and Properties of
The coal gangue was sampled from the Lu Gou Coal Mine in Henan Province, China, and it was composed of sandstone and limestone, the sandstone …
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Influence of kaolinite content in coal-series metakaolin and …
Cement blend with calcined clay and limestone is a promising approach to achieve sustainability. Besides conventional soft clay, coal-series gangue (a major solid waste in the coal mining industry) can also be calcined to substitute cement. This study aims to study and compare the influence of the coal-series metakaolin (CMK) and soft …
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Novel Methods for Separation of Gangue from …
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 …
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