Limestone-gangue mixture that comes closest to the reference one considered in our study contains 18.5% of coal gangue. The oxide composition for this mixture: C = 63.2, S = 21.0, A = 7.97, F = 2.06, which are close to the values used in the manufacture of cement. It is therefore possible to recycle and valorize coal gangue in the development ...
The coal gangue used in this study was obtained from Shuozhou, Shanxi province, China. The chemical composition of the raw coal gangue as well as the residue ash were quantified by an inductively coupled plasma optical emission spectrometer (ICP-OES, Pekin-Elmer, Optima 5300DV) and X-ray fluorescence spectrometry (XRF, …
Coal gangue is the main solid waste in coal mining areas, and its annual emissions account for about 10% of coal production. The composition information of coal gangue is the basis of reasonable utilization of coal gangue, and according to the composition information of coal gangue, one can choose the appropriate application …
The composition of coal gangue is more complex, and its main minerals include clay minerals, carbonate minerals, bauxite, pyrite, quartz, mica, feldspar, carbonaceous and …
In addition to quartz, the diffraction peaks of Al 2 SiO 5, CaSO 4 and Fe 2 O 3 also exist in CG, so the main mineral composition of coal gangue also includes kaolinite and pyrite. The large amount of anorthite is also one of the reasons why coal gangue is …
The composition of coal gangue and clay is roughly the same [19], with outstanding pore structure and good adsorption performance, etc. However, the adsorption ability of gangue powder on phase change materials still needs to improve, and the thermal storage performance of the formed gangue-based composite phase change materials …
2.1. The mineral and chemical composition of coal gangue. Generally, the main mineral phases of coal gangue are kaolinite, quartz, pyrite, illite, calcite, ankerite, …
Main chemical components of calcined coal gangue was analyzed by X-ray fluorescence spectroscopy (XRF), as shown in Table 1.The mineral components of original coal gangue and coal gangue calcined at 700 °C by X-ray diffraction (XRD) and demonstrated the results in Fig. 2.The main mineral components of coal gangue …
With the continual advancement of coal resource development, the comprehensive utilization of coal gangue as a by-product encounters certain constraints. A substantial amount of untreated coal gangue is openly stored, particularly acidic gangue exposed to rainfall. The leaching effect of acidic solutions, containing heavy metal ions …
The elemental content of nitrogen in coal gangue is lower than that in coal, while sulfur in coal gangue is relatively higher than that in coal. The analyses of the ash composition show that coal gangue and coal have similar ash compositions. The XRD patterns of coal gangue and coal are shown in Fig. 1. It can be seen that the diffraction …
In this study, the microstructure, mineral composition, and precipitation of heavy metal elements of coal gangue with different weathering degrees were analyzed through electron microscopy, X-ray ...
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 …
The mineral composition of coal gangue from different mining areas, formed in different sedimentary environments, determined its chemical elemental concentration characteristics. The Nanyangpo samples exhibited high SiO 2 (53–68%) and low Fe 2 O 3 contents (0.61–2.25%), which attributed to the enrichment of quartz and …
In this paper, coal gangue powder (CGP) was used to replace 30% of the cement weight. The dosage of steel slag powder (SSP) was 5%, 10%, 15%, 20%, and 25% of the coal gangue weight. The CGP-SSP-cement mortars and pastes were prepared. The compressive and flexural strengths, hydration heat, X-ray diffraction (XRD), …
The uniaxial compressive strength, phase composition, microstructure, and pore structure of the MCG-based LC 3 cements were analyzed. The results indicate that the maximum volcanic ash activity index is achieved when the material is microwave-activated at 800°C with a holding time of 20 minutes. ... Coal gangue: The coal gangue (CG) …
The composition information of coal gangue is the basis of reasonable utilization of coal gangue, and according to the composition information of coal gangue, one can choose the appropriate ...
The coal gangue activity primarily arises from the conversion of well-crystallized kaolinite into disordered metakaolin [117, 118]. Through the utilization of microwave activation, Guan modified the mineral composition of coal gangue powder, effectively isolating the active compounds and enhancing the roundness and fineness of …
Identification of Clay Minerals and Chemical Composition in Coal Gangue. The clay minerals in the coal gangue were identified using X-ray diffraction (XRD) analysis. The coal gangue samples were initially crushed and subsequently placed in an oven for drying at a constant temperature of 105 °C. After drying, the samples were finely ground …
The thermal behavior of two mineral-type coal gangues under different temperature conditions was investigated by heating treatment of kaolinite-type coal gangue and illite-type coal gangue based on thermal analysis, X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM). Thermogravimetric, …
In addition, the composition of coal gangue is closely associated with coal mining process. At present, the comprehensive utilization of coal gangue is mainly …
The chemical composition of coal gangue is listed in Table 2, and its main components are 47.32 % SiO 2, 22.99 % Al 2 O 3, and 28.20 % Loss on ignition (LOI). Additionally, other components such as TiO 2, SO 3, Fe 2 O 3, K 2 O, and CaO are also detected.
During mining, processing and utilization of coal, the environment is exposed to piles of coal, coal gangue and coal ash, which have human health concerns. Coal and coal gangue samples were obtained from a coal mining company located in Southern Province, Sinazongwe District, Zambia. The main objective of this research was to …
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 .
In the composition of coal gangue, SiO 2 is the main component, followed by Al 2 O 3. The content of SiO 2, Al 2 O 3, and S in the weathered coal gangue was …
1. Introduction. Coal gangue is an undesired but inevitable by-product emitted during coal mining and processing, accounting for approximately 10 %–15 % of the raw coal output [1].In 2020, China's coal gangue output exceeded 400 million tons [2].Currently, the accumulated coal-gangue stockpile in China is 6 billion tons [3].Coal …
DOI: 10.1016/J.FUEL.2012.02.027 Corpus ID: 93714613; Transformation behavior of mineral composition and trace elements during coal gangue combustion @article{Zhou2012TransformationBO, title={Transformation behavior of mineral composition and trace elements during coal gangue combustion}, author={Chuncai …
The rock composition of coal gangue is related to the geological condition of the coal field and the mining technology. The composition of the rocks varies widely and is complex, mainly composed of shale (carbonaceous shale, argillaceous shale, silty shale), mudstone (mudstone, carbonaceous mudstone, silty mudstone), it is composed of …
Coal gangue is one of China's main industrial solid wastes, which contains various harmful heavy metal elements, such as lead (Pb). The long-term accumulation of coal gangue causes Pb to migrate to the surrounding environment due to weathering and rain erosion, eventually endangering human life and health with its continuous …
The composition and structure of the coal gangue and the as-prepared sodalite were characterized by XRD, TG-DTG, FTIR, XPS, N 2 adsorption–desorption technique, laser particle analyzer, SEM–EDS, …
Coal gangue is the main solid waste in coal mining areas, and its annual emissions account for about 10% of coal production. The composition information of coal gangue is the basis of reasonable ...
Coal gangue, produced during coal mining and processing [1, 2], is one of the most extensively produced solid wastes in China [1, 3], accounting for approximately 10%‒20% of raw coal production [].The accumulation of coal gangue causes serious environmental, social, and economic problems in the coal mining area [].Heavy metals …
The morphology of coal gangue and combustion ash were analyzed by scanning electron microscope (FEI Sirion 200). The mineral composition of coal gangue and combustion ash were determined by X-ray powder diffraction techniques (XRD), each of samples was analyzed using a PHILIPS X' Pert PRO X-ray diffractometer with Cu K …
The changes in composition and structure of coal gangue during heat and mechanical activation were investigated by means of XRD, IR and nuclear magnetic resonance (NMR). The results show that during calcining process of coal gangue, coal in the coal gangue burned, kaolinite gradually transformed into metakaolin when calcining temperature …