The main mineral components of the raw coal gangue are kaolinite (52.2%), mica (16.9%) and quartz (16.1%), and the main chemical components of the low-heat and low-carbon coal gangue are SiO 2, Al 2 O 3 and Fe 2 O 3. ② Slag: S75 slag was collected from Handan Jinyu Taihang Cement Company (Hebei, China). ③ Fly ash: Grade Ⅱ fly …
Recognition of coal and gangue (roof rock) is a key technology to realize fully mechanized top coal caving automated mining. This paper proposes to detect the …
Wet-grinding was used to increase the pozzolanic reactivity of coal gangue. • No aggregation phenomenon was noticed during the wet-grinding. • Using wet-ground coal gangue as SCMs significantly increased the compressive strength of cement composites. • All the cement composites present good immobilization capacity of heavy …
2.2. Sampling. As shown in Fig. 1 B, 26 sampling sites were selected across the coal gangue-filled reclamation area at Xinzhuangzi mine, Huainan city, Anhui province, China. Surface (0–20 cm depth) soil samples (each of approximately 1 kg) were systematically collected from agricultural land, orchard, forest land and culture pond of …
2.2 Mix Proportion. According to JGJ51-2019 "Technical Specification for Light Aggregate Concrete," the water–cement ratio of coal gangue mixed aggregate concrete is a fixed value of 0.43, and coarse aggregate of coal gangue replaces coarse aggregate of pumice with equal volume, with substitution rates of 0%, 20%, 40%, 60%, …
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 …
Abstract. Seriously environmental pollution has been induced by discarding of coal gangue (CG) that produced during coal mining and washing processes. Using …
Coal gangue (CG) is generated during coal mining activities. ... CG was collected from Datong region, Shanxi province, China. The received CG was first calcinated at 900 °C for 6 h in an incinerator, followed by grinding the particles using a crusher and sifting with sieves to a particle size of 0.075 mm, 0.5–1.0 mm and 5.0–20.0 mm. CG a ...
Study on modes of occurrence and selective leaching of lithium in coal gangue via grinding-thermal activation. Hangchao Chen Lei Zhang +6 authors Changchun Zhou. Chemistry, Engineering. ... Distribution and Enrichment of Al-Li-Ga-REEs in the High-Alumina Coal of the Datong Coalfield, Shanxi Province, China. P. Shao Hongjiang Hou …
The coal gangue was ground into fine powder (CG) [20], [21] and its surface area is 400 m 2 /kg; the industrial analysis is shown in Table 1 and the chemical composition is shown in Table 2.The GBFS used in the experiment is the S95 granulated blast furnace slag powder which conforms to the Chinese standard GB/T 1806-2008 and …
The recognition technology of coal and gangue is one of the key technologies of intelligent mine construction. Aiming at the problems of the low accuracy of coal and gangue recognition models and the difficult recognition of small-target coal and gangue caused by low-illumination and high-dust environments in the coal mine …
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 …
Coal gangue (CG) is a solid waste discharged in process of coal mining and washing, which accounts for 8–20 % by weight of the total coal output. ... Mechanical grinding, thermal treatment and chemical activation are generally used to destroy crystal structure of kaolinite in CG particles and further improve its activation.
Coal gangue is a kind of industrial solid waste with serious ecological and environmental implications. ... Tan X.J., Cheng J., Li L. Concept and Practice of Open-pit Mining Area Restoration and Reuse—Taking an Open-pit Coal Mining Area in Datong, Shanxi as an Example. ... Wang J. Study on activity of calcined grinding high/Low calcium coal ...
for their nearly mono-mineralic composition with low impurity content [1–4]. At Datong, coal-measure kaolinite is commonly developed in the roof, floor and coal gangue of the No.4 coal seam of the Shanxi Formation, as well as in the No.2, No.3, No.5, No.8 and No.9 coal seams of the Taiyuan formation [2].
Carbon dioxide emissions are the primary and most direct contributor to global warming, posing a significant hazard to both the environment and human health. In response to this challenge, there has been a growing interest in the development of effective carbon capture technologies. This study involved the synthesis of 13-X …
On the basis of analyzing coal gangue's chemical and mineral compositions, the structure change of coal gangue during the mechanical activation was investigated by XRD, FTIR, NMR, and the mechanical strength of the cement doped coal gangue with various specific surface area was tested. The experimental results indicate that, the …
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. ... GUO YX, YAN KZ, CUI L, et al. Improved extraction of alumina from coal gangue by surface mechanically grinding modification[J]. Powder Technology, 2016, …
Three coal gangue dumps in the Datong region subjected to a range of reclamation conditions were investigated to assess the influence on coal fires. Coal, coal …
Based on laboratory analysis of soil samples collected from abandoned coal mine in Datong area, content of heavy metals in the soils was monitored and the soils were evaluated for heavy metal ...
The coal gangue in China is the core field of bulk solid waste comprehensive utilization due to its massive stock and emission, high concentration of output, small proportion of high-value-added utilization, and outstanding environmental impact. Hence, the prospect of resource utilization of coal gangue is broad. The existing disposal …
Possibility of cemented gangue backfill was studied with gangue of Suncun Coal Mine, Xinwen Coal Group, Shandong, and fly ash of nearby thermal power plant, in order to treat enormous coal gangue on a large scale and to recovery safety coal pillars. The results indicate that coal gangue is not an ideal aggregate for pipeline gravity flow …
This paper provides new geochemical data focusing on valuable elements in the coal, parting, and floor samples in the No. 5 coal seam of the Taiyuan Formation from the Wujiawan mine, Datong coalfield, northern China. The minerals mainly consist of kaolinite, calcite, and pyrite, as well as trace amounts of quartz and illite. The No. 5 coal …
Pyrite is common in coal gangue formed in a reduced environment and has a significant influence on the recycling utilization of coal gangue. Four types of pyrite with different structures and morphologies, namely octahedral pyrite framboid, pentagonal dodecahedral pyrite framboid, irregular grain pyrite, and euhedral octahedral crystalline …
On March 12, 2008, the China National Development and Reform Commission approved the coal-electricity integration project to build 2×135MW coal …
This research takes Panel 8222 of Datong Coal Mine Group Co., Ltd. as the research object. The layout of Panel 8222 is shown in Fig. 2, where the width is 230.5 m, the length is 2644.5 m and the average dip angle is 2°. Coal 3–5 is mainly mined in Panel 8222, the seam thickness is in the range of 8.17–29.21 m, and the variation coefficient ...
In Tangshan Mine, there are four engineering problems, including the layout of multiple seam mining system, serious environmental damages caused by gangue accumulation and surface collapse, nearly 100 million tons of three under coal (coal trapped under buildings, water bodies, and railways) to be released, and the control …
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 …
Grinding tests of coal gangue samples were conducted to explore the effect of selective grinding on the pre-enrichment of REY in coal gangue. The effect of selective grinding on the enrichment and distribution characteristics of REY was investigated by changing the grinding time (0, 2, 4, 6, 8, and 10 min).
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 …
Upon grinding and calcination, the reactivity of coal gangue is found to be on par with the traditional precursors such as fly ash and ground granulated blast furnace slag. This indicates the possibility of coal gangue-based geopolymers in replacing traditional binders for various applications such as bricks, tiles, precast concrete …
Sorting gangue from raw coal is an essential concern in coal mining engineering. Prior to separation, the location and shape of the gangue should be extracted from the raw coal image. Several approaches regarding automatic detection of gangue have been proposed to date; however, none of them is satisfying. Therefore, this paper …
Dianbin Liu & Jiarong Li. 86 Accesses. 6 Citations. Explore all metrics. Abstract. Experimental studies were carried out to find the difference of preheating …
The finely ground sl ag produced by rapid air cooling and flue ga s grinding is an environmentally . ... In this study, geopolymers synthesized from coal gangue (waste generated during coal mining ...
Most of the coal gangue in the Late Paleozoic strata of North China is rich in kaolinite [12]. Kaolinite is a naturally occurring clay mineral with a layer structure comprised of siloxane and ...
Experimental studies were carried out to find the difference of preheating characteristics of Datong coal in O2/CO2 and air atmospheres by a circulating fluidized bed. It is found that pulverized coal could be both steadily preheated to above 800°C in the two different atmospheres, but the temperature distribution was more uniform along the …
Project-level coal details. Permit(s): April 29, 2015; Background. Datong Coal Mining Group has proposed a power station of two units of 350 MW each. The environmental …
9 coal gangue sourced from Antaibao and Donglutian open pits, respectively. The Datong coaleld is located in the northern part of China's Shanxi Province. The coaleld is a synclinal structural basin with an axis of NE–SW. NYP-1, NYP-2, and NYP-3 are the No. 3–5 coal gangue from the Nanyangpo mining area of the Datong coaleld. Samples