the existing lling technology of coal gangue underground, the grouting technology of mine yellow mud and the evolution law of mining-induced overburden cracks 19–27 . e principle and process ow ...
اقرأ أكثرIntelligent coal gangue separation equipment has the advantages of fast speed, high precision, strong modularity, and integration scalability. It also has the …
اقرأ أكثرUsing infrared detection technology to establish a coal gangue recognition model, coal gangue sorting can be achieved based on the difference in …
اقرأ أكثر1. Introduction. Conventional coal mining industries are associated with significant environmental issues including ground collapse and subsidence, water pollution and loss, and mining waste disposal [[1], [2], [3]].For example, the coal mining, processing and burning generate 795 million tons of coal gangue and 650 million tons of fly ash in …
اقرأ أكثرCoal gangue was collected from Haerwusu open-pit mine, Jungar coalfield, Inner Mongolia, China. The samples were crushed and ground to less than 0.075 mm and dried in a 105 ℃ oven for 8 h for subsequent leaching tests. ... Standard solutions of REY (NCS141015) and Al (NCS141018) were purchased from NCS Testing Technology Co., Ltd. 2.2 ...
اقرأ أكثرThe coal-washing process produces a large amount of coal gangue that needs to be used. CFB combustion technology, ... Therefore, emission control at coal-fired power plants has played an important role in clean coal technologies in China, as with efficiency promotion. 4.1. Current status
اقرأ أكثرPossibility 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 …
اقرأ أكثرCoal gangue image recognition is a critical technology for achieving automatic separation in coal processing, characterized by its rapid, environmentally …
اقرأ أكثرCoal gangue is one of the largest industrial residues. It has high ash content, low carbonaceous content, and heating value. Meanwhile, it has some trace elements. Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land. …
اقرأ أكثرCoal 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 …
اقرأ أكثرCoal gangue gypsum pumping filling technology. The filling aggregate used in this technology is coal gangue (Heng 2022) which is crushed to qualified particle size (less than 5 mm), the cementitious material is common Portland cement, and the pipeline transportation performance improver is fly ash and high-efficiency water-reducing agent. …
اقرأ أكثرLow-energy and efficient coal gangue sorting is crucial for environmental protection. Multispectral imaging (MSI) has emerged as a promising technology in this domain. This work addresses the ...
اقرأ أكثرCoal gangue: The coal gangue (CG) used in this study is untreated raw coal gangue, sourced from Lingshou County, Hebei Province, China. Its appearance mostly presents as flakes or blocks of black-gray rocks, and the shape and size of CG vary. The main chemical components of the CG are shown in Table 1, measured by X-ray …
اقرأ أكثرCoal 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 …
اقرأ أكثرThis paper presents a deep learning-based coal gangue sorting system for practical applications, enabling automatic and precise detection of gangue during the …
اقرأ أكثرBy establishing a coal-gangue separation system based on the difference between coal and gangue in their surface texture and grayscale feature, this paper …
اقرأ أكثر1. Introduction. Gangue minerals accounts for between 15% and 20% of raw coal in China (Qian et al., 2007).Indeed, as coal production has increased, so has gangue generation; by the end of 2009, the total amount of gangue produced added up to 5.0 × 10 9 t, encompassing 40% of the total Chinese solid waste (Miao and Qian, …
اقرأ أكثرStarting from the resource characteristics of coal gangue, this paper systematically discusses the ways and research status of coal gangue resource utilization, mainly including: extracting and recovering …
اقرأ أكثرThe technical framework of filling goaf with coal gangue slurry. The technology of filling goaf with coal gangue slurry is to make gangue into granular aggregate with a specific particle size ...
اقرأ أكثرAlthough 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. ... This research was funded by the "Anhui Provincial Science and Technology Major Project, grant number ...
اقرأ أكثرtechnology to establish a coal gangue recognition model, coal gangue sorting can be achieved based on the differencein infrared images between coal and gangue.17,18 However, this method needs high-temperature control requirements and is greatly affectedby temperature. Machine learning algorithms
اقرأ أكثرThe technical framework of filling goaf with coal gangue slurry. The technology of filling goaf with coal gangue slurry is to make gangue into granular aggregate with a specific particle size gradation by crushing, screening, and other technical means, mixing and stirring it with water in proportion to make gangue slurry with a …
اقرأ أكثرTechnology 2 is that surface loess cover is used to reduce the airflow of spontaneous combustion area of coal gangue. Technology 3 is that grouting slurry technology can reduce heat quantity of spontaneous combustion area by the way of drilling and fracture. These technologies can effectively control spontaneous combustion area …
اقرأ أكثرAddressing these research gaps is crucial for advancing the use of coal gangue in LC 3 production and promoting the sustainable development of low-carbon cement technologies. By leveraging coal gangue, China can not only mitigate the raw material constraints for LC 3 cement but also pave the way for innovative solutions in the …
اقرأ أكثرThe hydration products of coal gangue cementitious material were a large number of C-S-H gel with fibrous shape and ettringite (AFt) with compact block structure. The theoretical reference was provided for the preparation of low cost gangue cemented filling materials in coal mines. ... Materials Science & Technology, 2016, 24(3): 80–84 ...
اقرأ أكثرIt is found that the diffusion radius of coal gangue slurry increases with the increase of grouting speeds, void ratios, and particle sizes. The diffusion law of coal gangue slurry is the key and foundation for the smooth implementation and good filling effect of coal gangue fluidization filling technology in caving areas 26. The above research ...
اقرأ أكثرIndustrial wastes such as steel slag and coal gangue etc. were chosen as raw materials for preparing ceramic via the conventional solid-state reaction method. With steel slag and coal gangue mixed in various mass ratios, from steel slag to coal gangue at 10% intervals, microstructure and possible phase evolution of the coal …
اقرأ أكثرThis study was conducted at the Suntuan coal mine in the Huaibei mining area, located at 33°33′49.5072″ N and 116°46′3.3852″ E. The coal gangue used in this study was obtained from the Suntuan coal mine and crushed to a size less than 5 mm, with particles below 2 mm, accounting for approximately 70%.
اقرأ أكثرThe elimination of SO 2 pollutants from coal fired flue gas through using industrial solid waste as absorbent has received widespread attention. Herein, a novel process on SO 2 purification by employing coal gangue slurry is proposed for the first time. The effects of different operating variables on SO 2 absorption efficiency were studied, …
اقرأ أكثرIn recent years, many scholars have done a lot of research on intelligent separation of coal gangue. Literature [6], [7] analyzes the single characteristic quantity of gray scale and texture of coal gangue and obtains relatively objective sorting results, but the sorting characteristics are relatively single and the accuracy is not high enough. Wu …
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