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Integrated ecological restoration techniques system for waste dumps of typical open-pit coal mine in alpine grassland:A case study of a six-year restoration project in Huolinhe South open-pit mine 认领 引用 被引量：2
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作者 Yu Zhao Chunli Zhao +4 位作者 Lifu Zheng Yujia He Qianqian Sang Zetong Wang Yongjie Liu 《Ecological Frontiers》 CSCD 2025年第3期678-688,共11页
The alpine grasslands of Eastern Inner Mongolia,located in a typical ecologically fragile zone within the“Northern sand prevention belts,”serve as both a crucial open-pit mineral energy base in China and a site of s... The alpine grasslands of Eastern Inner Mongolia,located in a typical ecologically fragile zone within the“Northern sand prevention belts,”serve as both a crucial open-pit mineral energy base in China and a site of significant ecological challenges.Open-pit mining supports the nation's energy needs but poses threats to local environmental security.Integrated ecological restoration,as opposed to traditional single-target strategies that exhibit limited effectiveness,emerges as a viable solution to address environmental issues in open-pit mines and waste dump areas,while ensuring the sustainability of the surrounding alpine grassland ecosystem.Given the unique characteristics of the alpine grassland and the limited access to advanced,integrated restoration concepts,our study has concentrated on the ecological rehabilitation of the Huolinhe South open-pit mine in Eastern Inner Mongolia through an in-depth developed ecological restoration technology system.This system,which includes landform reshaping,soil and water conservation,soil enhancement,vegetation restoration,and monitoring of restoration effects,was applied,and its impacts on soil erosion control,vegetation coverage,and water conservation capacity of the ecological project area and impact area were tracked and evaluated between 2017 and 2023.The quantitative assessments demonstrate significant reductions in soil erosion,increases in vegetation coverage and enhancements in the water conservation capacity.The contribution rate from the ecological project area to the impact area was 36.39%,32.87%,and 27.36%,respectively,attributable to ecological restoration efforts.These results underscore that integrated ecological restoration improves environmental conditions and fosters sustainable,high-quality regional development.The study aims to offer a localized,systematic,and scalable ecological restoration approach for typical open-pit mines and waste dump areas in alpine grasslands. 展开更多
关键词 Open-pit coal mine dump Ecological restoration techniques Effectiveness evaluation Green and high-quality regional development The alpine grassland of eastern Inner Mongolia
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Instability mechanisms of slope in open-pit coal mines:From physical and numerical modeling 认领 引用 被引量：12
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作者 Guanghe Li Zihuan Hu +5 位作者 Dong Wang Laigui Wang Yanting Wang Lichun Zhao Hongjun Jia Kun Fang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第11期1509-1528,共20页
The stability of open-pit mine slopes is crucial for safe and efficient mining operations.However,the presence of weak interlayers poses significant challenges in maintaining the stability of slopes.To explore the imp... The stability of open-pit mine slopes is crucial for safe and efficient mining operations.However,the presence of weak interlayers poses significant challenges in maintaining the stability of slopes.To explore the impact of the rock arching effect on slopes during excavation,understand the deformation zones and evaluation stages in such environments,and analyze the formation and characteristics of cracks,this study investigated the instability mechanism of open-pit mine slopes with weak interlayers through physical and numerical modeling.Focusing on the Zaharnur open-pit coal mine in China as a prototype,a sophisticated physical model test employing particle image velocimetry and Brillouin optical frequency domain analysis was conducted to comprehensively analyze the displacement and strain variation characteristics of open-pit mine slopes.The displacement,strain,stress redistribution,and failure processes of slopes under excavation were comprehensively analyzed through physical and numerical modeling.The results showed that the slope model exhibited a strain pattern in which the strain incrementally increased from its center toward the edges,and the landslide thrust was converted into an internal force along the arch axis and transmitted to the supports.The concept of the rock arching effect specific to soft rocks was proposed,shedding new light on an important phenomenon specific to open-pit slopes with weak interlayers.Based on its deformation characteristics,the slope could be divided into three areas:The excavation influence area,the crack area and the failure area.In addition,the ratios of the height and width of the outermost cracks to the excavation width fluctuated in the ranges of 0.36–0.49 and0.72–1.00,respectively.These findings contribute to a better understanding of the instability mechanisms in open-pit mine slopes with weak interlayers and provide valuable guidelines for safe mining practices. 展开更多
关键词 Open-pit mine slopes Instability mechanisms Rock arching Particle image velocimetry Strain monitoring
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Research and Application of Cable Fault Repair Technology in Open-pit Coal Mine 认领 引用
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作者 ZHANGYagang 《外文科技期刊数据库（文摘版）工程技术》 2022年第1期199-202,共4页
This paper mainly discusses the cable usage of the open coal pit power supply system and main mining equipment of National Energy Group Zhun Energy Co., Ltd., and explores the limiting factors of the fault problem of ... This paper mainly discusses the cable usage of the open coal pit power supply system and main mining equipment of National Energy Group Zhun Energy Co., Ltd., and explores the limiting factors of the fault problem of the mine cable and the original cable repair technology, and the failure rate of the power supply quality can be fully guaranteed. 展开更多
关键词 open-pit coal mine cable fault recovery technology research application exploration and discussion
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Analysis of Control Effect of Blasting Vibration in Open-pit Coal Mine 认领 引用
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作者 XUYuanyuan ZHANGZhijie ZHANGXiaobo 《外文科技期刊数据库（文摘版）工程技术》 2022年第3期056-059,共4页
In recent years, China's overall social and economic system has undergone rapid and effective development under the promotion of personnel in various scientific research aspects. Driven by the economy, many indust... In recent years, China's overall social and economic system has undergone rapid and effective development under the promotion of personnel in various scientific research aspects. Driven by the economy, many industries in China have encountered many challenges with the advantages of such a large economic environment, but not only many challenges appear, but also challenges have also brought a lot of development opportunities. Enterprises to seize these opportunities can greatly promote their own economic rapid and effective development. Driven by the development of the social and economic system, the coal mining industry continues to develop through many measures. However, at present, the open-pit coal mines in China will produce a great vibration during blasting, which has brought a lot of harmful effects to the coal mining land. If these harmful effects are not effectively controlled, then for the coal mining enterprises will not only cause great damage to the machinery and equipment, in many cases, there will even endanger the life safety and property safety of the personnel on the site. 展开更多
关键词 open-pit coal mine blasting vibration harmful effect control measures analysis
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Analysis on Localization of Mine Cables and Localization of Cable Connectors in Open-pit Coal Mine 认领 引用
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作者 GONGYEXiangjian 《外文科技期刊数据库（文摘版）工程技术》 2022年第3期050-054,共5页
The power supply cable of Heidaigou Open-pit Coal Mine uses the coupling connection of cable head. The whole power supply equipment is from Australia's Peyton Cook Company and Canada's UEE Company. As these ac... The power supply cable of Heidaigou Open-pit Coal Mine uses the coupling connection of cable head. The whole power supply equipment is from Australia's Peyton Cook Company and Canada's UEE Company. As these accessories need to be imported, the purchase cost of materials and accessories in Heidaigou Open-pit Coal Mine rises sharply and the purchase cycle is long, which greatly hinders the production in the mine. This paper mainly discusses the domestic transformation of high-voltage heavy-duty mining towing rubber-sheathed power cable and cable connection device, and also analyzes the direction of use and the improvement of economic benefits after the transformation, hoping to play a certain role in promoting the development of relevant enterprises. 展开更多
关键词 open-pit coal mine mine cables cable connector domestic transformation discussion and argument
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Risk Management and Control of Blasting Operation in Large Open-pit Coal Mine 认领 引用
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作者 XUYuanyuan ZHANGXiaobo ZHANGZhijie 《外文科技期刊数据库（文摘版）工程技术》 2022年第1期192-195,共4页
Coal is the most needed energy in the development of China's industrial production. The coal mine industry plays an important role in economic construction. China's coal mine production is an important project... Coal is the most needed energy in the development of China's industrial production. The coal mine industry plays an important role in economic construction. China's coal mine production is an important project in the second industry. However, the safety of coal mine construction needs to attract people's attention. Although the coal mine blasting operation project can bring more convenient coal mine processing, it has huge risks and brings huge hidden dangers to the coal mine production machinery and equipment as well as the personal safety of the staff. The blasting technology required by large open-pit coal mine needs to be improved. Based on the investigation and analysis of the current situation of large open-pit coal mine, this paper puts forward the wind direction management and control measures for the blasting project to reduce the harm brought by the blasting operation of coal mine. 展开更多
关键词 coal mine blasting blasting risk preventive measures risk management and control open-pit coal mine
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How to Improve the Production Efficiency of Mechanical and Electrical Equipment in the Open-pit Coal Mine 认领 引用
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作者 LYUHaibo 《外文科技期刊数据库（文摘版）工程技术》 2022年第1期178-182,共5页
Due to the large demand for coal resources in China, coal mining industry received great attention, compared with underground mine mining, open mine mining work is more simple, the risk factor is not as big as mine mi... Due to the large demand for coal resources in China, coal mining industry received great attention, compared with underground mine mining, open mine mining work is more simple, the risk factor is not as big as mine mining, although open mine can improve the economic benefits of coal production, but the open coal mine maintenance of mechanical and electrical equipment and maintenance is need to be solved in time. According to the current use of mechanical and electrical equipment in open pit coal mines in China, it is not difficult to see that the production efficiency of mechanical and electrical equipment in open pit coal mines will have a very important impact on the overall engineering efficiency of coal mining projects. In view of the problems existing in the use of electromechanical equipment in open-pit coal mine, the measures and improvement methods to improve the production efficiency of electromechanical equipment in open-pit coal mine are proposed to make more contributions to the coal mine industry. 展开更多
关键词 mechanical and electrical equipment production efficiency coal mine industry development open-pit coal mine
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Discussion on Safety Management in Field Construction of Open-Pit Coal Mine 认领 引用
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作者 ZHAO Rong 《外文科技期刊数据库（文摘版）工程技术》 2021年第11期081-084,共4页
In recent years' development, our country's coal production increased, and the number of coal mine engineering is also increasing. But in the process of open-pit coal mine construction, a lot of people did not... In recent years' development, our country's coal production increased, and the number of coal mine engineering is also increasing. But in the process of open-pit coal mine construction, a lot of people did not attach enough importance to coal mine safety problem of the construction site, to a certain extent, increased the risk of coal mine construction work, and the influence on ecological environment. Based on this, it is very important to strengthen the safety management in the construction of open pit coal mine. Only in this way can the safety of construction and production be guaranteed and the hidden dangers of the field construction of open pit coal mine be reduced. 展开更多
关键词 open-pit coal mine site construction the safety management
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Study on the Application of Hydrogeological Disasters in Open-pit Coal Mine 认领 引用
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作者 LIUYan TANGHongyu 《外文科技期刊数据库（文摘版）工程技术》 2022年第8期223-227,共5页
The hydrogeological disasters in open-pit coal mines are of great harmfulness. By analyzing the factors that lead to the hydrogeological disasters in coal mines, we can make full use of the existing technical conditio... The hydrogeological disasters in open-pit coal mines are of great harmfulness. By analyzing the factors that lead to the hydrogeological disasters in coal mines, we can make full use of the existing technical conditions, using the advanced scientific technology such as gamma ray technology, borehole perspective technology, flow logging technology and seismic exploration technology, and taking effective measures to pay attention to the work of hydrological observation in coal mines, doing well the work of coal mine hydrogeological exploration, doing well the measures of underground water prevention, combining the actual situation of open-pit coal mine, doing well the prevention work of coal mine hydrogeological disaster scientifically and reasonably, to ensure the safety of coal mine workers, to enhance the safety of coal mining operations, to promote the sustainable, healthy and stable development of our coal industry. 展开更多
关键词 open-pit coal mine hydrogeological disaster disaster prevention technology
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Study on the Application of Real-Time Drone Monitoring in Ordos Open-Pit Coal Mine 认领 引用 被引量：1
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作者 Junyi Wu Weizheng Wang Xuesong Ni 《Open Journal of Applied Sciences》 2023年第4期483-495,共13页
In the process of intelligent mine construction in open-pit mine, in order to improve the safety monitoring ability of mine transportation system, solve the problems of large human interference and blind Angle detecti... In the process of intelligent mine construction in open-pit mine, in order to improve the safety monitoring ability of mine transportation system, solve the problems of large human interference and blind Angle detection by existing conventional monitoring methods, this paper establishes an open-pit mine monitoring data set, and proposes a real-time intelligent monitoring model based on UAV. The reasoning component with strong computing power and low power consumption is selected, and the lightweight object detection model is selected for the experiment. A quantitative standard of dynamic energy consumption detection by evaluation algorithm is proposed. Through experimental comparison, it is found that YOLOv4-tiny has the highest comprehensive grade in detection accuracy, speed, energy consumption and other aspects, which is suitable for application in the above model. 展开更多
关键词 Open-Pit Mine Safety Monitoring UAV Object Detection
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Development Status and Key Technologies of Unmanned and New Energy Trucks in Open-pit Coal Mines in China 认领 引用
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作者 CUI Yang 《外文科技期刊数据库（文摘版）工程技术》 2021年第12期102-104,共3页
With the in-depth exploration of large open-pit coal mines, the phenomenon of steep slope multi-bend gradually increases, and the mining car is difficult to drive, and there are hidden safety hazards. This paper puts ... With the in-depth exploration of large open-pit coal mines, the phenomenon of steep slope multi-bend gradually increases, and the mining car is difficult to drive, and there are hidden safety hazards. This paper puts forward a design scheme of unmanned truck driving system in opencast coal mine, which can realize safe, efficient, energy saving and environmental protection transportation in opencast coal mine. In order to promote the application of unmanned mining truck technology in open-pit mines, the practical significance of unmanned mining truck technology in open-pit mines is expounded, and the technical difficulties to be overcome in the application of this technology are analyzed. 展开更多
关键词 open-pit mine mining truck unmanned
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Development Trend of Mining Theory and Technological Technology of Open-pit Coal Mine 认领 引用
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作者 WANGShaoyong 《外文科技期刊数据库（文摘版）工程技术》 2022年第2期204-207,共4页
China's economy has been in the stage of rapid development since the reform and opening up, and the coal resources have played an irreplaceable role in the economic development, and China's coal mine industry ... China's economy has been in the stage of rapid development since the reform and opening up, and the coal resources have played an irreplaceable role in the economic development, and China's coal mine industry has achieved unprecedented rapid development in this period. The rapid development of open-pit coal mine has taken the lead in realizing the international integration of open-pit coal mining theory, and established its own mining theory, which has its own advantages in certain aspects. At present, China attaches more and more importance to environmental protection, and the public attaches great importance to the protection of natural ecological environment. The country has put forward new requirements for the mining and processing of high energy consumption and high pollution natural resources, and pay attention to mining in the process of environmental protection, green mining has become a new topic. For China's coal industry, the safety of coal resources mining and recycling is a very important link, advanced open-pit coal mine mining facilities, centralized capacity production slowly become the mainstream way of coal mining, the international open-pit coal mining technology of the most advanced forms in our country are more successful. In this paper is the development trend of open coal mining theory and its technology. 展开更多
关键词 open pit coal mining theory technology development trend
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Characteristics and genomic mechanism of Absidia spinosa in inhibiting coal spontaneous combustion 认领 引用 被引量：1
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作者 Xuanmeng Dong Botao Qin +3 位作者 Fusheng Wang Xiangming Hu Liwen Guo Tiesheng Han 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第1期57-78,共22页
Early prevention and control of coal spontaneous combustion have emerged as a critical research area in coal mine safety.Due to their sustainability and environmental friendliness,microorganisms have gained attention.... Early prevention and control of coal spontaneous combustion have emerged as a critical research area in coal mine safety.Due to their sustainability and environmental friendliness,microorganisms have gained attention.A filamentous fungus was collected in the coal mine and identified as Absidia spinosa.Results indicated that the mycelium effectively covered and repaired many coal pores.The oxygen consumption ratio of A.spinosa was higher in coal-containing environments than in coal-free conditions.The fungus significantly impacted aliphatic functional groups,disrupting bridging bonds and side chains connected to aromatic structures and reducing the relative content of C—O bonds.Additionally,A.spinosa increases the ignition temperature by 25.34℃.The total heat release was decreased by approximately 32.58%,and the activation energies were increased.The genome of Absidia spinosa revealed genes related to oxygen consumption,small molecule degradation,and secretion of metabolic products,such as those annotated under GO ID:0140657,etc.The pathways involved in the degradation of small organic molecules(e.g.,ko00626,etc.),carbon fixation,and nitrogen cycling,all linked to coal decomposition.Through oxygen consumption and the alteration of coal-active structures,A.spinosa effectively inhibits CSC,providing an experimental basis for exploring eco-friendly biological control methods in the goaf. 展开更多
关键词 Coal spontaneous combustion Microorganisms Low-temperature oxidation Aerobic respiration Genomic mechanism
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Toxicity of respirable coal dust:An overview of origin,chemistry,mechanisms,and possible remedies 认领 引用 被引量：2
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作者 Amir Eskanlou Barbara J.Arnold 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2026年第1期1-23,共23页
The prevalence of coal workers'pneumoconiosis(CWP)has been on the rise among U.S.coal miners since the early 2000s and is most pronounced in central Appalachia.Such adverse effects on human health are partly linke... The prevalence of coal workers'pneumoconiosis(CWP)has been on the rise among U.S.coal miners since the early 2000s and is most pronounced in central Appalachia.Such adverse effects on human health are partly linked to the toxicity of respirable coal mine dust particles.In this review,we present an overview of the characteristics and health effects of the coal dust components,as well as the origin,chemistry,and mechanisms for their potential toxicity.Toxicity of coal mine dust is linked to the surface chemistry and bioactivity of the composing particles,such as coal,crystalline silica(quartz),pyrite,and sometimes diesel particulate matter.Formation of reactive oxygen species,such as·OH on the surface of these particles,contributes to the toxicity of coal dust.Various mechanisms including the metal-micelle coating,polymer-coating,chelation of the surface metal ions,and surface silanization,have been proposed in previous studies for the reduction or inhibition of the toxicity of coal dust particles.However,due to the complexity in surface chemistry of the various minerals and coal,there is no single universal detoxification mechanism for coal dust.One feasible remedy to address the proposed mechanisms of toxicity is the use of chemical additives as wetting agents.Important considerations for this approach include particle size and aging,mineralogy,morphology,chemical composition,solubility,surface charge,and synergistic effects of the composing phases.Additional factors to consider are the solution quality and composition,coal rank,and the potential hazards and costs associated with the chosen chemical agents. 展开更多
关键词 Quartz Pyrite Coal Clay Toxicity Respirable dust
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Nonlinear mechanical analysis of load-bearing characteristics of coal-support-backfill system crossing abandoned roadways 认领 引用 被引量：1
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作者 Jun Guo Zi Wang +8 位作者 Guorui Feng Jinwen Bai Xiaoze Wen Wenbo Huang Jie Zhang Wenming Feng Quan Liu Jiahao Zhang Longlong Yang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期246-264,共19页
Roof pre-fracture poses a considerable risk during the re-mining of residual coal above abandoned roadways,threatening the safety of the mining faces.This study employs a Winkler foundation beam model for mechanical a... Roof pre-fracture poses a considerable risk during the re-mining of residual coal above abandoned roadways,threatening the safety of the mining faces.This study employs a Winkler foundation beam model for mechanical analysis of roof structures and adopts a multivariate nonlinear analysis approach to explore the synergistic load-bearing effects within the'coal pillar-support-backfill body'system during the fill and re-mining processes above these roadways.The findings demonstrate that backfill mining significantly reduces stress concentrations in coal pillars and reduces excessive bending moments in roofs near abandoned roadways.The roof deflection equation incorporates three critical factors affecting stability during backfill mining:the width of the coal pillar(L3),the working resistance of the support(qz),and the elastic foundation coefficient of the backfill material(kcÞ.Under single-factor conditions,the impact sequence on roof stability in the coal pillar zone is·kc>L3>qz.Further,multivariate nonlinear analysis reveals the interactions within the'coal-support-backfill'structure,indicating that in terms of roof control,the interaction terms are ordered as L3·kc>qz·kc>L3qz.Therefore,priority should be given to adjusting the coal pillar width and backfill strength,followed by modifications to the support resistance and backfill strength during the recovery of abandoned roadways.An improved understanding of these interactions will help optimize strategies for the recovery of residual coal through abandoned roadways,thereby enhancing the stability and safety of mining operations under complex geological conditions. 展开更多
关键词 Filling re-mining Coal pillar instability Abandoned roadway crossing Similar simulation Synergistic load-bearing
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Global coal-rock gas resource potential and distribution 认领 引用 被引量：1
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作者 LI Guoxin CHEN Ruiyin +7 位作者 WEN Zhixin ZHANG Junfeng HE Zhengjun FENG Jiarui KANG Hailiang MENG Qingyang MA Chao SU Ling 《Petroleum Exploration and Development》 SCIE 2026年第1期16-30,共15页
Based on the data of regional geology,seismic,drilling,logging and production performance obtained from 94 major petroliferous basins worldwide,the global coal resources were screened and statistically analyzed.Then,u... Based on the data of regional geology,seismic,drilling,logging and production performance obtained from 94 major petroliferous basins worldwide,the global coal resources were screened and statistically analyzed.Then,using established definition methods and evaluation criteria for coal-rock gas in China,and by analogy with the tectono-sedimentary and burial-thermal evolution conditions of coal rocks in sedimentary basins within China,the geological resource potential of global coal-rock gas was estimated mainly by the volume method,partly by the volumetric method in selected regions.According to the evaluation indicator system comprising 14 parameters under 5 categories and the associated scoring criteria,the target basins were ranked,and the future research targets for these basins were proposed.The results reveal that,globally,coal rocks are primarily formed in four types of swamp environments within four categories of prototype basins,and distributed across five major coal-forming periods and eight coal-accumulation belts.The total geological coal resources are estimated at approximately 42×1012t,including 22×1012t in the strata deeper than 1500 m.The global geological coal-rock gas resources in deep strata are roughly 232×1012m3,of which over 90%are endowed in Russia,Canada,the United States,China and Australia,with China contributing 24%.The top 10 basins by coal-rock gas resource endowment,i.e.Alberta,Kuznetsk,Ordos,East Siberian,Bowen,West Siberian,Sichuan,South Turgay,Lena-Vilyuy and Tarim,collectively hold 75%of the global total.The Permian,Cretaceous,Carboniferous,Jurassic,and Paleogene-Neogene account for 32%,30%,18%,10%,and 7%of total coal-rock gas resources,respectively.The 10 most practical basins for future coal-rock gas exploration and development are identified as Alberta,Ordos,Kuznetsk,San Juan,Sichuan,East Siberian,Rocky Mountain,Bowen,Junggar and Qinshui.Propelled by successful development practices in China,coal-rock gas is now entering a phase of theoretical breakthrough,technological innovation,and rapid production growth,positioning it to spearhead the next wave of the global unconventional oil and gas revolution. 展开更多
关键词 coal coal-rock gas geological resources resource potential basin type resource distribution gas content
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Classification of coal-forming environments and the formation and evolution of coal 认领 引用 被引量：1
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作者 LI Yong ZOU Caineng +5 位作者 LIANG Tianqi LI Yujie LIU Hanlin LIU Le GAO Shuang XU Weikai 《Petroleum Exploration and Development》 SCIE 2026年第1期125-137,共13页
There is a lack of systematic understanding of coal-forming environment classification and its influences on coal petrological characteristics,a coal-forming mire classification scheme applicable to the petroleum indu... There is a lack of systematic understanding of coal-forming environment classification and its influences on coal petrological characteristics,a coal-forming mire classification scheme applicable to the petroleum industry is proposed based on modern ecological peatland frameworks.The formation,evolutionary processes,and diagnostic criteria of coal-forming environments are systematically clarified.The results show that:(1)modern peatlands can be classified according to hydrological conditions,vegetation types,and geomorphic settings,and coal-forming mires can be divided into low moor,transitional,and high moor peat mires based on geomorphology;(2)the development of coal-forming environments includes three modes:subaqueous peat infilling,autochthonous peat accumulation in wetlands,and mire development in arid regions;(3)peat accumulation is jointly controlled by plant production and decomposition,hydrological disturbances,and sediment input,and the peat-to-coal thickness ratio varies with coalification;(4)diagnostic criteria for low moor,transitional,and high moor peat mires are established based on ash yield,gamma-ray log responses,and vitrinite-to-inertinite ratios;and(5)transgression-regression processes exert a key control on peat mire evolution,directly influencing peat thickness and continuity,while the evolution of low moor,transitional,and high moor mires governs coal maceral assemblages and thereby affects hydrocarbon generation potential and reservoir properties of coals.The coal-forming environment classification and identification system developed in this study effectively reveals the vertical heterogeneity of coals in the Ordos Basin,providing theoretical and practical guidance for efficient exploration and development of coal-rock gas. 展开更多
关键词 coal-forming effect peat mire coal facies sedimentary microfacies coal rock sedimentary environment coalbed methane coal-rock gas Late Paleozoic Ordos Basin
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The melting transformation mechanism of corundum and mullite in coal ash under reducing atmosphere 认领 引用
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作者 Baoliang Xia Facun Jiao +3 位作者 Yi Cheng Lirui Mao Jian Wang Hanxu Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第5期203-214,共12页
Si/Al-rich coal ash tends to generate refractory minerals during gasification,leading to elevated ash fusion temperatures(AFTs)and viscosity.This increases the risk of slagging in entrained-flow gasifiers.Previous stu... Si/Al-rich coal ash tends to generate refractory minerals during gasification,leading to elevated ash fusion temperatures(AFTs)and viscosity.This increases the risk of slagging in entrained-flow gasifiers.Previous studies have reported that the regulation mechanism of high-alumina coal(HAC)by low-AFT coal and transformation of corundum and mullite into eutectic are key factors in improving ash fusibility.However,coal ash has a complex composition,and other components of HAC may affect the melting transformation paths of minerals.In this study,high-purity corundum and mullite were introduced into ash,and the changes during the heating process of coal ash with minerals were investigated.The melting behaviour of two minerals and their impact on the melt structure at high temperature were examined to explain the effect of the two minerals on ash fusibility.The results indicate that increasing the corundum residue in the coal ash,leading to elevated AFTs.Variations in the corundum residue were closely related to the transformation paths of the two minerals during melting.Mullite decomposed into the planar laminar structure(Q3)of Si-O network structures during instantaneous heating.The Q3 species migrated into the coal ash melt,increasing the Al concentration gradient between the liquid phase and corundum derived from mullite;by contrast,the added corundum developed a boundary layer upon corrosion by the molten phase,reducing the Al concentration gradient in solid—liquid phases and increasing the decomposition time of corundum.The interaction between the mineral and liquid phases in coal ash formed a corundum-containing suspension during the melting process,thereby increasing the AFT of ash.Therefore,promoting mullite formation instead of corundum in HAC helps lower AFT for gasification. 展开更多
关键词 Refractory mineral Coal ash Fusibility Diffusion Crystallization Reaction
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Coal creep deformation and pore-fracture evolution under cyclic loading-unloading using NMRI and fractal analysis 认领 引用
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作者 Wenhao Jia Hongwei Zhou +5 位作者 Fangwei Li Eryi Hu Senlin Xie Lei Zhang Zelin Liu Shukai Jin 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第7期1329-1344,共16页
Understanding the creep deformation behavior and the evolution of pore-fracture structures(FPSs)in coal under cyclic loading-unloading is crucial for safe extraction and efficient methane utilization.Coal samples were... Understanding the creep deformation behavior and the evolution of pore-fracture structures(FPSs)in coal under cyclic loading-unloading is crucial for safe extraction and efficient methane utilization.Coal samples were subjected to cyclic loading-unloading creep experiments using online Nuclear Magnetic Resonance(NMR)and Nuclear Magnetic Resonance Imaging(NMRI)techniques.The results revealed the significance of instantaneous plastic and viscoplastic strains during creep,with creep failure modes analyzed using NMRI data and macroscopic fracture distribution.Viscoplastic strain was identified as a key indicator of accelerated failure,and NMRI revealed a transition from splitting-shear to V-shaped shear failure under increasing confining pressure.From a microscopic perspective,real-time T2 spectra monitoring tracked the evolution of FPS at different loading levels,and the geometric mean of the pore structure(T2g)quantitatively described the co-evolution of various pore types.A generalized model was developed to describe coal creep under cyclic loading-unloading,integrating microscopic and macroscopic deformation features and refined using fractal theory.These findings provide theoretical insights and practical guidance for coal extraction and methane management under cyclic loading-unloading creep. 展开更多
关键词 Online test Cyclicloading-unloading Pore-fracture structure Creep deformation Coal
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Mineral transformation behavior in coal ash slag during plasma underground coal gasification 认领 引用
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作者 Chuan Qi Weibin Wang +3 位作者 Jiahong Cao Xiongchao Lin Yueming Liu Shuqin Liu 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2026年第2期281-302,共22页
Plasma underground coal gasification(PUCG)facilitates targeted carbon reduction reactions,tackling CO2 emissions and effectively generating syngas that is rich in H2 and CO.The mineralogical properties are essen... Plasma underground coal gasification(PUCG)facilitates targeted carbon reduction reactions,tackling CO2 emissions and effectively generating syngas that is rich in H2 and CO.The mineralogical properties are essential for determining gasification parameters,managing production,and assessing environmental stability.PUCG operates under high temperatures and a strong reducing atmosphere,which significantly affects mineral transformation,yet this field is still not extensively studied.In this work,PUCG ash slag from various coal types and ash compositions was created.The study investigated mineral transformation,melting behavior,and crystallization characteristics using X-ray diffraction,scanning electron microscopy with energy-dispersive spectroscopy,and FactSage software.Findings reveal that the syngas concentration during PUCG can reach to 88%(volume fraction),with peak temperatures ranging from 3806 to 6569 K and average temperatures between 1391 and 1935 K.In high-silica-alumina coal ash slag,the predominant mineral is mullite,while high-calcium/iron coal ash slag contains gehlenite,hedenbergite,and wüstite.The strong reducing atmosphere results in a Fe+Fe2+/ΣFe ratio to~1.0,compared to<0.5 under weak reducing conditions,causing a 103 K difference between the complete melting temperature(CMT)of high-iron coal and the flow temperature(FT)under weak reducing conditions.An excess of SiO2 in high-silica-alumina coal hinders the melting of mullite,resulting in a deviation of up to 340 K between CMT and FT.The minerals in high-calcium/iron coal undergo decomposition,transformation,complete melting,and recrystallization.Elemental iron serves as a stable nucleation site,while high energy density provides the necessary temperature and duration for molten minerals recrystallization. 展开更多
关键词 Plasma Underground coal gasification Slag Strong reducing atmosphere Crystallization
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