Mechanistic Analysis Of Rare Earth Element Extraction From Coal Byproducts Using Supercritical Fluid Process: Solubility Studies Of Supercritical Carbon Dioxide With Tbp: Hno3 Complex,
2025
UAlaska System
Mechanistic Analysis Of Rare Earth Element Extraction From Coal Byproducts Using Supercritical Fluid Process: Solubility Studies Of Supercritical Carbon Dioxide With Tbp: Hno3 Complex, Zakiya Konda Nurudeen
Engineering
This thesis introduced the essence of REE application in the modern world, the primary and secondary sources of REEs. It revised the fundamentals of supercritical carbon dioxide (SC- CO2), its application in REE extraction as green technology, the complex formation of tributyl phosphate (TBP)- nitric acid (HNO3), and temperature-pressure effects in REE extraction. The methodology systematically examined the thermodynamic solubility of CO2 in TBP-nitric acid (HNO3) complexes at three molar ratios (2:1, 1:1, and 1:2), temperatures between 40-60 degrees Celsius, and at a maximum pressure of 12 MPa, respectively. Preliminary extraction experimental runs were conducted to validate solubility studies. Data …
Environmental Regulations And The Exploitation Of Deep Seabed Minerals : A New Era For The“Mining Code” Of The International Seabed Authority (Isa)?,
2025
World Maritime University
Environmental Regulations And The Exploitation Of Deep Seabed Minerals : A New Era For The“Mining Code” Of The International Seabed Authority (Isa)?, Mikyla D'Antoinette Frederick-Winter
World Maritime University Dissertations
No abstract provided.
Comparative Fire Hazards Of Lithium-Ion Battery Chemistries: Linking Thermal Behavior, Gas Toxicity, And State-Of-Charge To Composite Risk Profiles,
2025
Missouri University of Science and Technology
Comparative Fire Hazards Of Lithium-Ion Battery Chemistries: Linking Thermal Behavior, Gas Toxicity, And State-Of-Charge To Composite Risk Profiles, Aamir Iqbal, Ashish Kakoria, Syed Talha Riaz, Jingmin Xu, Robert Illango Pushparaj, Guang Xu
Mining Engineering Faculty Research & Creative Works
Lithium-ion batteries (LIB) are widely used in electric vehicles (EVs) for their high energy density. However, their fire safety causes concerns because of the toxic gases emission and the challenge to extinguish. The type and quantity of toxic gases released during battery fires remain among the least studied hazards, with limited data available despite their serious health risks. This study examines the thermal and gaseous emission behavior of LIB cells after thermal runaway (TR). Five cell types, Lithium Iron Phosphate (LFP), Lithium Titanate (LTO), and three Lithium Nickel Manganese Cobalt oxide (NMC). The three NMC variants share the same base …
Energy-Harvesting Concurrent Lora Mesh With Timing Offsets For Underground Mine Emergency Communications,
2025
Missouri University of Science and Technology
Energy-Harvesting Concurrent Lora Mesh With Timing Offsets For Underground Mine Emergency Communications, Hilary Kelechi Anabi, Samuel Frimpong, Sanjay Madria
Mining Engineering Faculty Research & Creative Works
Underground mine emergencies destroy communication infrastructure when situational awareness is most critical. Current systems rely on centralized network infrastructure, which fails during emergencies when miners are trapped and require rescue coordination. This paper proposes an energy-harvesting LoRa mesh network that addresses self-powered operation, interference management, and adaptive physical layer optimization under severe underground propagation conditions. A dual-antenna architecture separates RF energy harvesting (860 MHz) from LoRa communication (915 MHz), enabling continuous operation with supercapacitor storage. The core contribution is a decentralized scheduler that derives optimal timing offsets by modeling concurrent transmissions as a Poisson collision process, exploiting LoRa's capture effect …
Coal Phase-Out In The Silesian Coal Regions – Building Sustainable Scenario On Past Experiences,
2025
University of Economics in Katowice, Poland
Coal Phase-Out In The Silesian Coal Regions – Building Sustainable Scenario On Past Experiences, Adam Drobniak, Jan Bondaruk, Mirosław Skibski
Journal of Sustainable Mining
The dynamics of phasing out of hard coal mining are currently the subject of many debates and policies programming the energy transition. Diversity of opinions on the speed of the hard coal mining transition is evident. This discourse uses a number of technical, environmental, economic and social arguments that are not always supported by evidence-based analyses. As assumed in the European Green Deal, a responsible approach to decarbonisation requires just transition values. Thus, the negative effects of mining phasing out should be well recognized to enable their mitigation. This applies especially to the Silesian Voivodeship, where the concentration of so-called …
Risk Prediction Of Surface-Water Bursting In The Gully-Crossing Mining Section Of Shallow Coal Seams Within Thin Bedrock Zones,
2025
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China
Risk Prediction Of Surface-Water Bursting In The Gully-Crossing Mining Section Of Shallow Coal Seams Within Thin Bedrock Zones, Niu Chao, Luo Yutao, Liu Ning, Xiao Lele, Sun Qiang, Zhang Weiwei, Xue Xicheng, Zeng Dabao, Bai Yang
Coal Geology & Exploration
Background The gully-crossing mining of shallow coal seams within thin bedrock zones is prone to connecting hydraulically conductive fracture zones in the overburden with surface water bodies, significantly increasing the risk of water disasters, such as water inrushes and surface-water bursting in mines. Some mining faces in the Shandong Coal Mine, Shaanxi Province are located beneath the Shajie Gully basin, where storm runoff is highly likely to flow into the underground mine through mining-induced fractures, posing a serious threat to mine safety. Therefore, there is an urgent need to research risk identification and assessment of surface-water bursting. Methods This study …
Influence Patterns Of Nanomaterials On The Properties Of Ultrafine Sulfoaluminate Cement,
2025
College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Influence Patterns Of Nanomaterials On The Properties Of Ultrafine Sulfoaluminate Cement, Li Xiaolin, Wang Pengfei, Gao Yinghui, Zhang Mingxuan, Dong Enyuan, Qu Yue, Zhao Yue
Coal Geology & Exploration
Objective and Methods This study aims to reduce the economic cost of sulfoaluminate cement-based grouting materials while also achieving excellent grouting reinforcement effects. To this end, it investigated the variation patterns of the compressive strength, setting time, and fluidity of the ultrafine fly ash (UFA)-ultrafine sulfoaluminate cement (USC) system by incorporating different dosages of silica fume (SF) and nano-silica (NS). Furthermore, the mechanisms behind the hydration reactions of the system were explored. Using multiple distinct testing techniques such as X-ray diffraction (XRD) mineralogy, Fourier transform infrared spectroscopy (FTIR), thermogravimetric-differential thermal analysis (TG-DTA), and scanning electron microscopy (SEM), this study analyzed …
Structural Characteristics Of The Overburden And Water Yield Property Of Weathered Bedrock Aquifer In A Representative Medium-Deep Coal Seam,
2025
Shaanxi Coal Caojiatan Mining Co., Ltd., Yulin 719001, China
Structural Characteristics Of The Overburden And Water Yield Property Of Weathered Bedrock Aquifer In A Representative Medium-Deep Coal Seam, Wang Lu, Hua Zhaolai, Huang Hao, Li Zenglin, Ren Shuaifeng, Wang Sitong
Coal Geology & Exploration
Background The weathered bedrock aquifer represents a major water-filled aquifer encountered during coal mining in the Jurassic coalfield in northern Shaanxi Province. Therefore, evaluating the water yield property of the weathered bedrock aquifer is the key to the prevention and control of water hazards in coal seam roofs. Methods This study investigated panel 12 of the Caojiatan Coal Mine, Shaanxi Province. Analysis of the stratigraphic and lithological structure types of the overburden of coal seam 2–2 identified the weathered bedrock as the primary overlying water-bearing aquifer of the coal seam. Using net-to-gross (NTG) ratio, sandstone thickness, weathering influence index, …
An Experimental Study On The Breakthrough Pressure Of Different Co2 Phases Against Cap Rocks For Carbon Storage In Saline Aquifers,
2025
Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China；Key Laboratory of Coast Civil Structure Safety of Ministry of Education , School of Civil Engineering, Tianjin University, Tianjin 300350, China
An Experimental Study On The Breakthrough Pressure Of Different Co2 Phases Against Cap Rocks For Carbon Storage In Saline Aquifers, Dan Wendong, Li Yi, Wang Fugang, Hu Zhikai, Diao Yujie, Ma Xin, Liu Ting
Coal Geology & Exploration
Objective CO2 breakthrough pressure, a core parameter for characterizing the sealing performance of saline aquifers as cap rocks, holds important scientific significance and application value for ensuring the safety of CO2 geological storage engineering and assessing its storage potential. However, there is a lack of systematic studies on the variation patterns and mechanisms of breakthrough pressure under different occurrence phases of CO2 (supercritical, liquid, and gaseous) currently. Accordingly, universal and reliable conclusions are yet to be reached. Methods This study conducted experiments on a natural low-permeability unsaturated sandstone core. Using the step-by-step method, 13 groups of breakthrough …
Characteristics And Driving Forces Of The Spatiotemporal Evolution Of Surface Water Bodies In Ecologically Fragile Mining Areas In The Yellow River Basin: A Case Study Of The Yushenfu Mining Area,
2025
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China; Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an 710054, Chinaå
Characteristics And Driving Forces Of The Spatiotemporal Evolution Of Surface Water Bodies In Ecologically Fragile Mining Areas In The Yellow River Basin: A Case Study Of The Yushenfu Mining Area, Chen Chao, Xuan Ang, Hu Zhenqi, Wang Yiming, Zhang Jiachao, Wang Guo, Yang Fuqin
Coal Geology & Exploration
Background This study aims to respond to the strategic demand for ecological protection and high-quality development in the Yellow River basin. To this end, research on the characteristics and driving forces of the spatiotemporal evolution of surface water bodies under the disturbance of intensive coal mining serves as the basis and a prerequisite for mitigating the contradiction between coal mining and water resources in ecologically fragile mining areas of the Yellow River basin. Methods Based on 10 stages of remote sensing image data from 1980 to 2023, information about surface water bodies in the Yushenfu mining area was extracted using …
Compressive Deformations And Energy Dissipation Characteristics Of Broken Rock Masses Under Lateral Confinement,
2025
College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Compressive Deformations And Energy Dissipation Characteristics Of Broken Rock Masses Under Lateral Confinement, Tian Yu, Lin Haifei, Li Shugang, Shuang Haiqing, Xu Peiyun, Liu Sibo, Ji Pengfei, Cui Mingwei
Coal Geology & Exploration
Objective This study aims to investigate the deformation and energy dissipation characteristics of broken rock masses in the caving zones of goafs during compression and to reveal their impacts on the movement and failure of overlying strata and surface subsidence. Using a self-developed experimental system, this study conducted compression experiments on broken rock masses under lateral confinement under different Talbot index values and axial stresses. Then, it analyzed variations in axial displacement, void ratio, relative breakage index, fractal dimension, and strain energy density of the broken rock masses during compression. Accordingly, this study quantified variation patterns of strain energy density …
Mechanisms And Risk Criteria For Water Inrushes Caused By Mining-Induced Propagation Of Concealed Faults In A Coal Seam Floor,
2025
College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Mechanisms And Risk Criteria For Water Inrushes Caused By Mining-Induced Propagation Of Concealed Faults In A Coal Seam Floor, Zhang Wenquan, Shao Jianli, Shi Junwei, Li Liangning
Coal Geology & Exploration
Background Concealed faults in a coal seam floor, characterized by random distribution, are prone to induce water inrushes, which are difficult to prevent and control. Objective and Method This study aims to investigate the mechanisms behind water inrushes induced by concealed faults in a coal seam floor under the influence of coal mining. Through a theoretical analysis, this study established the mechanical models of the initial cracking and wing crack propagation of concealed faults under seepage pressure. By analyzing the maximum propagation height of concealed faults in the floor and the post-propagation safe thickness of aquicludes, this study proposed criteria …
Overview And Prospects Of Plain Reservoir Construction And Utilization In Coal Mining-Induced Subsidence Areas With High Water Tables In The Lower Reaches Of The Yellow River,
2025
College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China; State Key Laboratory of Disaster Prevention and Ecology Protection in Open-pit Coal Mines, Shandong University of Science and Technology, Qingdao 266590, China
Overview And Prospects Of Plain Reservoir Construction And Utilization In Coal Mining-Induced Subsidence Areas With High Water Tables In The Lower Reaches Of The Yellow River, Chen Shaojie, Jiang Ning, Zhang Genwang, Jiang Chunlin, Gao Qun
Coal Geology & Exploration
Background Coal mining-induced subsidence areas with high water tables in the lower reaches of the Yellow River are encountered with pronounced contradictions between large-area water accumulation and issues including urban water scarcity, groundwater contamination, ecological degradation, and low farmland reclamation rates. These contradictions severely restrict the green, low-carbon transformation of cities with coal mines and hinder the high-quality development of the Yellow River basin. This study aims to explore the construction of plain reservoirs in these subsidence areas as a critical approach to the intensive utilization of water and land resources in the subsidence areas, as well as the ecological …
Discussion On Multi-Sphere Responses And Damage Reduction-Oriented Geological Guarantees In Coal Mining,
2025
Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an 710054, China；Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China；College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
Discussion On Multi-Sphere Responses And Damage Reduction-Oriented Geological Guarantees In Coal Mining, Wang Shuangming, Sun Qiang, Li Shibo, Hu Xin, Gu Chao, Geng Jishi, Zhou Shutao, Yuan Shihao, Song Shijie, Niu Chao, Wu Yun, Chen Yang
Coal Geology & Exploration
Objective Coals serve as a cornerstone for ensuring the energy security of China. However, coal mining activities break the original in situ stress equilibrium, triggering multi-sphere damage conduction and coupling responses in the lithosphere, hydrosphere, pedosphere, biosphere, and atmosphere from underground to the surface, involving rock mass structure, groundwater, and surface environment. Consequently, the original structural relationships, occurring elements, and functions of these spheres will be changed. Presently, investigating the multi-sphere structural evolution, conservation, and utilization in coal mining to underpin the role of coals as an energy cornerstone is significant for resolving the contradiction between the high-quality development of …
Table Of Contents,
2025
China Coal Technology and Engineering Group (CCTEG)
Influence Mechanisms Of Soil Layer Reconstruction And Fungal Inoculation On Plant Water Use In Waste Dumps,
2025
Institute of Ecological Environment Restoration in Mine Areas of West China, Xi’an University of Science and Technology, Xi’an710054, China；State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology (Beijing),Beijing 100083. China
Influence Mechanisms Of Soil Layer Reconstruction And Fungal Inoculation On Plant Water Use In Waste Dumps, Bi Yinli, Li Zhongqing, Ke Zengming, Peng Suping
Coal Geology & Exploration
Objective In the mining areas of open-pit coal mines in the arid and semi-arid regions in western China, water scarcity severely restricts ecological restoration. As preliminary ecological effects have been achieved through soil layer reconstruction and bioremediation-based reclamation technologies in waste dumps of the mining areas, there is an urgent need to investigate the effects of both technologies on the water use and growth of representative plants. This will provide a scientific basis for accelerating ecological restoration in the mining areas. Methods In a waste dump of the Heidaigou open-pit coal mine in Inner Mongolia, four experimental program for soil …
Influence Patterns Of Coal Mining-Induced Subsidence On Economic Losses From Soil Erosion Of Loess Slopes In The Middle Reaches Of The Yellow River,
2025
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China; Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an 710054, Chinaå
Influence Patterns Of Coal Mining-Induced Subsidence On Economic Losses From Soil Erosion Of Loess Slopes In The Middle Reaches Of The Yellow River, Song Shijie, Li Yuanhong, Wang Yi, Liu Lu, Tian Yu, Tan Qingyu
Coal Geology & Exploration
Background Quantitative assessment of economic losses from soil erosion on subsidence slopes in coal mining-induced subsidence areas can offer a critical basis for formulating scientific economic compensation standards while also laying a solid foundation for efficient governance.Methods This study investigated the subsidence slopes with different morphologies in the typical loess area subjected to coal mining-induced subsidence in northern Shaanxi Province. Using methods including field sampling, laboratory tests, and environmental economics analysis, this study constructed an index system for the quantitative assessment of economic losses from soil erosion on coal mining-induced subsidence slopes and revealed the variation patterns of such …
Mechanisms Behind Consolidation-Induced Water Release From Effective Impermeable Soil Layers And Mine Water Inflow Prediction In Coal Mining,
2025
School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China
Mechanisms Behind Consolidation-Induced Water Release From Effective Impermeable Soil Layers And Mine Water Inflow Prediction In Coal Mining, Li Tao, Gao Ying, Fan Limin, Yang Junwei
Coal Geology & Exploration
Background In the Yushen mining area, coal mining is gradually shifting toward areas with thick soil layers. This leads to continuous water release from the saturated soils above the hydraulically conductive fracture zones, thereby significantly increasing the burden of mine water drainage. Focusing on the Yushuwan Coal Mine in northern Shaanxi, this study investigated the mechanisms behind mining-induced water release from effective impermeable soil layers and predicted mine water inflow. Methods Using conventional hydrochemistry, isotopic hydrochemistry, and a high-throughput microbial sequencing method, this study conducted qualitative and quantitative identification of the primary water sources of a mine in the Yushuwan …
Numerical Simulations Of The Influence Of Vegetation Configuration On Dust Migration In Open-Pit Coal Mines,
2025
College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Postdoctoral Research Station of Geological Resources and Geological Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Numerical Simulations Of The Influence Of Vegetation Configuration On Dust Migration In Open-Pit Coal Mines, Han Li, Li Renjie, Bi Yinli
Coal Geology & Exploration
Background Dust pollution emerges as a major environmental challenge in the open-pit mining of coal mines. Ecological restoration has found widespread applications in mining areas as a crucial measure. However, there is a lack of systematic studies on the role of vegetation configuration in dust migration. Methods Using the computational fluid dynamics (CFD) method for numerical simulation, this study constructed a comprehensive simulation framework incorporating wind field reconstruction, dust migration, and the dust retention capacity of vegetation. By setting different particle sizes and wind speeds, this study systematically analyzed dust migration patterns. Furthermore, vegetation configuration was introduced into the simulation …
Links Of Intensification Chemical Weathering And Nickel Enrichment With Volcanism In The North China Plate Around The Permian-Triassic Boundary,
2025
School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Links Of Intensification Chemical Weathering And Nickel Enrichment With Volcanism In The North China Plate Around The Permian-Triassic Boundary, Wang Ye, Ye Chengzhuo, Zhang Tong, Yang Minfang, Zhou Kai, Zhang Peixin, Yang Yuzhu, Zhang Chu, Lu Jing
Coal Geology & Exploration
Objective The North China Plate serves as a pivotal region for deciphering the mechanisms underlying the links of volcanism and paleoenvironmental-climatic upheavals around the Permian-Triassic Boundary (PTB). The dramatic environmental perturbations during this period are closely linked to large-scale volcanic eruptions of the Siberian Traps Large Igneous Province (STLIP). These eruptions triggered global warming, extreme chemical weathering events, and mass extinctions, marking a significant turning point in the evolution of the Earth system.Methods This study investigated the Sunjiagou and Liujiagou formations in the WY-U-01H borehole in the Qinshui Basin, North China Plate. Using the chemical index of alteration (CIA), …
