It is proposed to develop clinkers from mixtures of limestone and coal gangue. - Limestone from a cement plant denoted L (lime). - The gangue (sterile) of the coal mine of Jerada denoted G. The ...
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 …
Therefore, this study aimed to promote the hydration and mechanical properties of the calcined coal gangue-limestone blended cements by increasing the curing temperature. In this study, the samples were cured at two different temperatures, namely 20 and 40 °C. Four groups of samples with 15 wt.%, 30 wt.%, 45 wt.% and 60 wt.% cement ...
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 …
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 …
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 ...
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 …
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 ...
The analysis of coal and gangue characteristics throughout the development of separation systems leads to different work implementation directions, some separation systems perform image geometric ...
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 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 ...
To assess the freeze–thaw (F-T) durability of coal gangue pervious concrete (CGPC) in different F-T cycle media (water, 3.5 wt% NaCl solution), experimental studies on 36 groups of cube specimens and 6 groups of prismatic specimens were carried out, with designed porosity, F-T cycling media, and F-T failure times as variables. The changes in …
DOI: 10.1016/J.POWTEC.2021.06.057 Corpus ID: 237665382; Dielectric and geometric feature extraction and recognition method of coal and gangue based on VMD-SVM @article{Wang2021DielectricAG, title={Dielectric and geometric feature extraction and recognition method of coal and gangue based on VMD-SVM}, author={Xinquan Wang …
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 …
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 …
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 …
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 …
To gauge the feasibility of using coal gangue for geotechnical and geoenvironmental applications, comprehensive characterization study was performed …
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 …
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 …
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 ...
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) …
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.
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, …
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 ...
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 ...
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 …
1.2. Source and distribution of CG in China. CG is a kind of black gray shale rock produced in the process of coal production. China is the world's largest coal producer (Munir et al., 2020) and also the largest coal consumer.Coal provides about 62% of China's energy demand (Mita et al., 2015).In the process of sorting and processing, the production of …
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%.
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
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