coal gangue with different chemical and mineral compositions are not clear. Furthermore, despite that many utilization methods were suggested, the inte-grated characteristics of coal gangue have not been systematically studied. The features of chemistry and minerals of coal gangue and its structure evolution
The chemical composition of coal gangue was analyzed through X-ray fluorescence (XRF) spectrometry (S4 PIONEER, ... The main processes corresponded to Reactions (1) and (2). ... For coal gangue with a high iron content, iron minerals can be recovered through magnetic separation to further purify the calcination products. ...
Download scientific diagram | Chemical composition of calcined coal gangue. from publication: Optimized Preparation of Porous Coal Gangue-Based Geopolymer and Quantitative Analysis of Pore ...
1. Introduction. Coal gangue (CG) is an industrial solid waste produced in the process of coal production. The global coal industry produces about 350 million tons of inactive coal gangue every year. 1.75 billion tons of coal gangue waste has been accumulated in landfills for decades in Europe [1, 2].At present, China's coal gangue has exceeded 7 …
XRF analysis of coal gangue shows that the average content of SiO 2 in the main chemical components of coal gangue is relatively high, with a content of 52.41%, followed by Al 2 O 3 with a …
The occurrence of gallium in gallium-enriched coal gangue and the migration of gallium during thermal treatment were systematically studied. The phase and chemical composition of gallium-enriched coal gangue were determined, and the gallium content was determined by inductively coupled plasma mass spectrometer (ICP-MS). The …
The aim of this work is to study the impacts of Na + and H 2 O on structural and mechanical properties of coal gangue-based geopolymer by experiment and molecular dynamics. Geopolymers were prepared by coal gangue and mixed solution of NaOH and water glass. Then X-ray fluorescence (XRF) and X-ray diffraction (XRD) were utilized to …
The mineral composition of coal gangue mainly includes quartz, clay minerals and carbonaceous materials, among which clay minerals account for …
January 18, 2024. Coal gangue is a fixed coal mining, washing, and processing product. It is a black-gray rock with lower carbon content and harder than coal associated with coal …
The main components of calcinated coal gangue are aluminosilicates, and the difference in the calcium content is the main reason for the different performances of the two concrete materials [20,21,22]. It may be possible to increase the compressive strength of concrete containing coal gangue by increasing the corresponding calcium content ...
The effects of hydrothermal conditions on coal gangue activation were investigated. • The hydrothermal modification generated potassium aluminum silicate, C–S–H and zeolite. • The study revealed the removal, migration and transformation of sulfur and heavy metals. • The modified coal gangue is a highly active and clean silicon-based ...
According to the content of oxide in coal gangue, coal gangue can be divided into clay gangue (SiO 2 (40–70%), Al 2 O 3 (15–30%)), sandstone gangue (SiO 2 > 70%), …
Skip main navigation. Close Drawer Menu Open ... G. Zhang, J. Liang, and M. Tao. 2014. "Synthesis factors affecting mechanical properties, microstructure, and chemical composition of red mud–fly ash based geopolymers." ... "Effects of the variety and content of coal gangue coarse aggregate on the mechanical properties of …
2.1. The mineral and chemical composition of coal gangue. Generally, the main mineral phases of coal gangue are kaolinite, quartz, pyrite, illite, calcite, …
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 …
Coal gangue is the main solid waste generated during the coal mining and washing process, which accounts for 15% to 20% of the coal production [2]. The cumulative …
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%.
The modes of occurrence of Ga and Li in coal gangue were studied using a sequential chemical extraction procedure (SCEP), mineral phase composition, time-of-flight secondary ion mass spectrometry (TOF-SIMS), and elemental content composition. The results indicate that the main mineral components of the coal gangue are mica, …
During the extraction and processing of coal, a large amount of solid waste, collectively known as gangue, is produced. This gangue has a low carbon content but a high ash content, accounting for approximately 15 to 20% of the total coal yield. Before coal is used, coal and gangue must be effectively separated to reduce the gangue …
Fouling and slagging are major challenges that impede the clean and efficient use of high-sodium coals (HC) for power generation. To address these persistent issues, this study examined the impact of sodium (Na) on ash-melting behaviors and assessed the feasibility of mitigating fouling and slagging through the co-combustion of HC with coal …
The chemical composition of CG is influenced by the types and content of minerals. Due to variations in rock types and content, the chemical and mineral composition of various CG types exhibit a certain degree of complexity (Table 3) [2]. Additionally, prolonged infiltration and diffusion effects from coal seams contribute to …
The utilization of coal gangue is usually subjected to calcination to achieve high chemical reactivity and exclude carbon. The correlation between the composition and properties of coal gangue during calcination is essential for its applications. In this paper, the effect of chemistry and minerals of coal gangues on the thermal behavior, …
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 …
The main chemical components are shown in Table 2. It can be seen from the table that n(SiO 2)/n(Al 2 O 3) = 5.5 is suitable for preparing the zeolite. The coal gangue was crushed, ball-milled, and then passed through 100 …
Coal gangue (CG), a residue with lower carbon content than coal discharged during mining, washing, and the processing of coal tunnelling, accounts for approximately 10-15% of unprocessed coal ...
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 …
These large stocks require urgent use for both environmental and economic reasons. Coal gangue is a heterogeneous material, it consists of a varied mixture of mineralogical components, such as quartz, kaolinite, illite, pyrite and others [4]. The main chemical compounds are SiO 2 and Al 2 O 3, with traces of CaO, P 2 O 5, and MnO 2 …
Coal gangue power generation Coal gangue grinding adopts fluidized bed technology. When the carbon content is greater than 20%, it can be used as energy and can be used to generate electricity. Recycling of coal and pyrite Coal gangue adopts composite dry coal preparation, cyclone, and heavy medium separation. When the coal …
Coal gangue (CG) is a type of industrial solid waste produced by the process of coal excavation and separation 1–3. Generally, one ton of CG is discarded for every 10 tons of produced coal 4,5 ...
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 .
Coal gangue is a complex industrial solid waste discharged during excavation and washing of coal in the course of production. The amount of coal gangue accumulated in China has exceeded 5 billion tons [1,2,3]; moreover, the stockpile of gangue is still increasing at the rate of approximately 0.3 billion tons per year [4, 5].The …
Table 3 shows the chemical composition of coal gangue in different areas of China. Although the SiO 2, Al 2 O 3, ... that the chloride ion permeability resistance of concrete gradually decreases with the increase of coal gangue content. The capillary pore gap is the main reason for the poor chloride ion permeability resistance of concrete ...
The main chemical composition varies greatly, for example, the carbon content of gasification fine slag is the highest, followed by coal gangue and gasification coarse slag, then fly ash, furnace bottom slag and desulfurization gypsum.
Coal gangue piles accumulate outside mines and can persist for years, negatively impacting the regional environment. To determine the main cause of soil pollution at coal gangues, several coal ...
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, and montmorillonite [36, 37].The coal gangue samples are usually dominated by silicon dioxide and aluminum oxide, followed by ferric oxide and potassium oxide accompanied …
The primary chemical composition content and micro-morphology of coal gangue, fly ash, and cement were determined using a Zetium series X-ray fluorescence spectrometer (XRF) and an Apreo Hivac high-resolution scanning electron microscope (SEM). ... The contents of main chemical components in coal gangue are 57.17%, …
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.
