Characterization studies on coal gangue for sustainable …
— 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 …
Characterization studies on coal gangue for sustainable …
— To gauge the feasibility of using coal gangue for geotechnical and geoenvironmental applications, comprehensive characterization study was performed …
Synergic performance of low-kaolinite calcined coal gangue blended …
— 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 ...
Mechanism and In Situ Prevention of Oxidation in Coal Gangue …
— 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 …
Using Chinese Coal Gangue as an Ecological Aggregate and …
— Coal gangue is a kind of industrial solid waste with serious ecological and environmental implications. Producing concrete with coal gangue aggregate is one of the green sustainable development requirements. This paper reviews the properties and preparation methods of Chinese gangue aggregate, studies the influence of gangue …
Synergistic performance of microwave-activated coal gangue …
Consequently, there is a pressing need to identify alternative sources of clay that can be utilized in LC 3 production to ensure its viability and scalability. ... LS = 2, the synergistic reaction between limestone and coal gangue with high kaolinite content is optimal. Its hydration products promote the stability of monocalcium carbonate phase ...
Environmental hazards and comprehensive utilization of solid waste coal
— 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 …
Preparation of coal gangue ceramsite high-strength …
— 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. ...
Identification and Activation of Coal Gangue and …
— Influence of kaolinite content in coal-series metakaolin and soft metakaolin on the performance of cement blends with and without limestone. ... However, a significant …
JRM | Free Full-Text | Properties and Hydration Mechanism of
— 1 Introduction. Coal gangue is a solid waste produced in coal mining and production, due to the lack of effective comprehensive utilization technology coal gangue is mainly disposed of in stockpiles, not only occupying extensive land but also leading to serious environmental pollution [1–5].Coal gangue with kaolinite as the main component, …
Recycling of Moroccan coal gangue in the elaboration …
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 ...
Effects of Coal Gangue on the Hydrochemical …
— 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, …
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 …
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 …
Geochemical effects of different types of mine water on …
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
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 ...
Influence of Curing Temperature on the Performance of Calcined Coal
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 ...
Influence of coal gangue mulching with various thicknesses …
— 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 ...
Synergistic performance of microwave-activated coal …
This study aims to apply microwave-activated coal gangue (MCG) to develop limestone calcined clay cement (LC 3). The impact of microwave activation schemes (microwave temperature and holding time) on the pozzolanic activity of coal gangue were explored.
Feasibility study on the preparation of ternary blended …
The academic concept of limestone calcined clay cement (LC 3) [22] has promoted some researchers to begin introducing limestone into the binary system of calcined coal …
Synergic performance of low-kaolinite calcined coal gangue …
— 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 …
Preparation of coal gangue ceramsite high-strength …
— 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 …
Co-combustion and emission characteristics of coal gangue …
— 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 gangue, low-quality …
Properties and Microstructure of an Interfacial …
— 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 …
Hydration mechanism of limestone calcined clay cement …
— DOI: 10.1016/j.conbuildmat.2024.136906 Corpus ID: 270750763; Hydration mechanism of limestone calcined clay cement containing calcined coal gangue @article{Shao2024HydrationMO, title={Hydration mechanism of limestone calcined clay cement containing calcined coal gangue}, author={Zhiyuan Shao and Mingli Cao}, …
Activation of Low-Quality Coal Gangue Using …
— 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 …
(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 ...
Properties and Microstructure of an Interfacial …
— 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 …
Research Progress on Comprehensive Utilization of Coal Gangue
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 …
The Sustainable Utilization of Coal Gangue in Geotechnical …
— 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 ...
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 images.
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 ...
(PDF) Recycling of Moroccan coal gangue in the elaboration …
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) of the coal mine of Jerada denoted G. The mixtures limestone-gangue, with a certain percentage % of gangue, are denoted LG%.
Influence of Curing Temperature on the …
— 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 …
Research on Recognition of Coal and Gangue Based on …
— 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 …