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Selection and thermal physical characteristics analysis of in-situ condition preserved coring lunar rock simulant in extreme environment Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-09-23 Haichun Hao, Mingzhong Gao, Cunbao Li, Xuan Wang, Yan Wu, Zheng Gao, Wen Yu, Xuemin Zhou
With the increasing scarcity of Earth’s resources and the development of space science and technology, the exploration, development, and utilization of deep space-specific material resources (minerals, water ice, volatile compounds, etc.) are not only important to supplement the resources and reserves on Earth but also provide a material foundation for establishing extraterrestrial research bases.
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Experimental study on instability mechanism and critical intensity of rainfall of high-steep rock slopes under unsaturated conditions Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-09-19 Xiaoshuang Li, Qihang Li, Yunmin Wang, Wei Liu, Di Hou, Wenbo Zheng, Xiong Zhang
Two critical factors, namely intense precipitation and intricate excavation, can trigger rock mass disasters in mining operations. In this study, an indoor rainfall system was developed to precisely regulate the flow and intensity of precipitation. A large-scale model experiment was conducted on a self-designed physical simulation experiment platform to investigate the failure and instability of high-steep
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A deformation measurement method based on surface texture information of rocks and its application Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-09-10 Yanbo Zhang, Xin Han, Peng Liang, Xulong Yao, Qun Li, Guangyuan Yu, Qi Wang
Users of the digital image correlation method are faced with the problem of poor operability, low repeatability, and lack of standardized specifications for spraying speckles. To solve the problem, the research proposed a rock deformation measurement method that obviates the need to spray speckles. A local binary model was established by using the local binary pattern (LBP) operator based on deep texture
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An image segmentation method of pulverized coal for particle size analysis Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-09-09 Xin Li, Shiyin Li, Liang Dong, Shuxian Su, Xiaojuan Hu, Zhaolin Lu
An important index to evaluate the process efficiency of coal preparation is the mineral liberation degree of pulverized coal, which is greatly influenced by the particle size and shape distribution acquired by image segmentation. However, the agglomeration effect of fine powders and the edge effect of granular images caused by scanning electron microscopy greatly affect the precision of particle image
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Deep-sea rock mechanics and mining technology: State of the art and perspectives Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-09-09 Zenghui Liu, Kai Liu, Xuguang Chen, Zhengkuo Ma, Houquan Zhang, Rui Lv, Changyun Wei, Ke Ma
The review covers the development and the state of the art in deep-sea mining rock mechanics, equipment and challenges. It begins by introducing the significance of deep-sea mining, the types and geographical distribution of deep-sea resources. Section 2 reviews the mechanical properties and fracture mechanism of seabed and related continental rocks, which contributes to the advancement of relevant
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Rock dynamics in deep mining Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-09-01 Manchao He, Qi Wang
Rock mass dynamics disasters caused by excavations and mining occur frequently in deep mines. In order to establish a theoretical system and control technologies for such disasters, we first classify and define dynamic disasters, such as rock bursts, coal bursts, mine pressure bumps, and mine earthquakes. According to the occurrence mechanism of different types of dynamic disasters, we establish a
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Integrated simulation and monitoring to analyze failure mechanism of the anti-dip layered slope with soft and hard rock interbedding Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-09-01 Jinduo Li, Yuan Gao, Tianhong Yang, Penghai Zhang, Yong Zhao, Wenxue Deng, Honglei Liu, Feiyue Liu
The significant difference between the mechanical properties of soft rock and hard rock results in the complexity of the failure mode of the anti-dip layered slope with soft and hard rock interbedding. In order to reveal the landslide mechanism, taking the north slope of Fushun West Open-pit as an example, this paper analyzed the failure mechanism of different landslides with monitoring and field surveys
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Numerical analysis on mechanical difference of sandstone under in-situ stress, pore pressure preserved environment at depth Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-09-01 Hongwei Zhou, Mingyuan Lu, Heping Xie, Wenhao Jia, Ruidong Peng, Yimeng Wang, Bocen Chen, Pengfei Jing
Deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties, differentiating it from traditional rock mechanics. To investigate the effect of in-situ stress, pore pressure preserved environment on the mechanical difference of sandstone, four tests are numerically modeled by COMSOL: conventional triaxial test, conventional pore pressure test, in-situ stress
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Stress-unloading and gas migration improvement mechanism in the soft and hard interbedded coal seam using directional hydraulic flushing technology Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-08-28 Hao Zhang, Yuanping Cheng, Cunbao Deng, Jingyu Jiang, Lei Zhang, Xiaoyu Yan, Junwei Guo, Suifang Wang
To enhance gas drainage in the soft and hard interbedded (SHI) coal seam, it’s necessary to unload the in-situ stress and improve its gas migration performance. In this research, a directional hydraulic flushing (DHF) technology was carried out. The stress-unloading and gas migration improvement mechanism was analyzed though numerical simulation, and systematic engineering tests were conducted to verify
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Dynamic damage evolution of bank slopes with serrated structural planes considering the deteriorated rock mass and frequent reservoir-induced earthquakes Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-08-22 Xinrong Liu, Yan Wang, Bin Xu, Xiaohan Zhou, Xueyan Guo, Luli Miao
To investigate the dynamic damage evolution characteristics of bank slopes with serrated structural planes, the shaking table model test and the numerical simulation were utilized. The main findings indicate that under continuous seismic loads, the deformation of the bank slope increased, particularly around the hydro-fluctuation belt, accompanying by the pore water pressure rising. The soil pressure
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Study of a low-disturbance pressure-preserving corer and its coring performance in deep coal mining conditions Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-08-21 Wei Huang, Jianan Li, Zhiqiang Liu, Mingqing Yang, Zhenxi You, Heping Xie
With the increasing depth of coal mining, the requirements for coring devices that maintain pressure are increasing. To adapt to the special environment in deep coal seams and improve the accuracy of testing gas content, a low-disturbance pressure-preserving corer was developed. The measurement of gas content using this corer was analyzed. The coring test platform was used to complete a coring function
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Drilling-based measuring method for the c-φ parameter of rock and its field application Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-08-08 Bei Jiang, Fenglin Ma, Qi Wang, Hongke Gao, Dahu Zhai, Yusong Deng, Chuanjie Xu, Liangdi Yao
The technology of drilling tests makes it possible to obtain the strength parameter of rock accurately in situ. In this paper, a new rock cutting analysis model that considers the influence of the rock crushing zone (RCZ) is built. The formula for an ultimate cutting force is established based on the limit equilibrium principle. The relationship between digital drilling parameters (DDP) and the c-φ
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Anchorage performance of large-diameter FRP bolts and their application in large deformation roadway Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-08-04 Jun Han, Zuoqing Bi, Bing Liang, Chen Cao, Shuangwen Ma
In underground coal mines, fibre reinforced polymer (FRP) bolt is ideal for mined rib reinforcements as it can prevent gas explosions caused by shearer frictional spark. With increasing mining depth, small diameter FRP bolts used in shallow underground mining cannot fulfil the rib support requirements. Under the engineering background of deep underground shortwall mining in Wudong coal mine, this paper
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Mechanical behavior of sandstone during post-peak cyclic loading and unloading under hydromechanical coupling Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-08-03 Yanlin Zhao, Jinhai Liu, Chunshun Zhang, Houquan Zhang, Jian Liao, Sitao Zhu, Lianyang Zhang
This paper investigates mechanical behaviours of sandstone during post-peak cyclic loading and unloading subjected to hydromechanical coupling effect, confirming the peak and residual strengths reduction laws of sandstone with water pressure, and revealing the influence of water pressure on the upper limit stress and deformation characteristics of sandstone during post-peak cyclic loading and unloading
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First-principles study on the co-adsorption of water and oxygen molecules on chalcopyrite (112)-M surface Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-08-01 Yingchao Liu, Jianhua Chen, Yuqiong Li, Cuihua Zhao
Chalcopyrite is a common copper-bearing mineral with antiferromagnetic properties. However, this property has rarely been considered in previous studies for detailed adsorption behaviors of molecules on chalcopyrite. Based on density functional theory (DFT), new adsorption pathways by H2O and O2 on the chalcopyrite metal terminated (112) surface ((112)-M) is found in this work. First, through simulating
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Effect of surfactant addition on leaching process of weathered crust elution-deposited rare earth ores with magnesium sulfate Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-07-27 Fang Zhou, Lisen Zhang, Zhiwei Wang, Yixin Zhang, Ruan Chi
Surfactants were proposed to be added into magnesium sulfate solution to improve the leaching process of weathered crust elution-deposited rare earth ores (WREOs). Effects of surfactants and their concentration on the seepage of leaching solutions and the leaching efficiency of rare earth (RE) and aluminum (Al) were investigated, and the leaching kinetics, the mass transfer process, the adhesion work
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Uniaxial compressive behaviour of a FRP standing support made of mine wastes Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-07-24 Zhenjun Shan, Ting Ren, Jan Nemcik, Guanzheng Wu, Liang Zhao
Twenty-seven specimens were tested to investigate the uniaxial compression behaviour of an innovative standing support for underground space applications. The innovative standing support consisted of an external fibre reinforced polymer (FRP) jacket and the infill column made of cementitious grout, tailings and coal wash rejects. Effects of the FRP layers number and water to the cementitious grout
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Determination of the load bearing capacity of pre-stressed expandable props for ground support in underground mines Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-07-20 Kunmeng Li, Kaiyuan Jiang, Yuanhui Li, Xin Wang, Kai Liu, Shuai Xu
This paper aims to determine the load bearing capacity of pre-stressed expandable props with different geometries and load eccentricities for flexible support in underground mining or excavation. It is deduced that the expandable device could have much higher strength (>89 MPa) by laboratory tests, and the load bearing capacity of the expandable prop may depend on the stability of the supporting steel
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Correlations between mineral composition and mechanical properties of granite using digital image processing and discrete element method Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-07-20 Changdi He, Brijes Mishra, Qingwen Shi, Yun Zhao, Dajun Lin, Xiao Wang
This study investigated the correlations between mechanical properties and mineralogy of granite using the digital image processing (DIP) and discrete element method (DEM). The results showed that the X-ray diffraction (XRD)-based DIP method effectively analyzed the mineral composition contents and spatial distributions of granite. During the particle flow code (PFC2D) model calibration phase, the
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Two-dimensional face stability analysis in rock masses governed by the Hoek-Brown strength criterion with a new multi-horn mechanism Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-07-20 Junhao Zhong, Xiaoli Yang
The face stability problem is a major concern for tunnels excavated in rock masses governed by the Hoek-Brown strength criterion. To provide an accurate prediction for the theoretical solution of the critical face pressure, this study adopts the piecewise linear method (PLM) to account for the nonlinearity of the strength envelope and proposes a new multi-horn rotational mechanism based on the Hoek-Brown
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Dynamic behavior of outburst two-phase flow in a coal mine T-shaped roadway: The formation of impact airflow and its disaster-causing effect Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-07-18 Liang Cheng, Jiang Xu, Shoujian Peng, Hailin Yang, Feng Jiao, Bin Zhou, Fazhi Yan
The study of the dynamic disaster mechanism of coal and gas outburst two-phase flow is crucial for improving disaster reduction and rescue ability of coal mine outburst accidents. An outburst test in a T-shaped roadway was conducted using a self-developed large-scale outburst dynamic disaster test system. We investigated the release characteristics of main energy sources in coal seam, and obtained
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Stability prediction of hard rock pillar using support vector machine optimized by three metaheuristic algorithms Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-07-18 Chuanqi Li, Jian Zhou, Kun Du, Daniel Dias
Hard rock pillar is one of the important structures in engineering design and excavation in underground mines. Accurate and convenient prediction of pillar stability is of great significance for underground space safety. This paper aims to develop hybrid support vector machine (SVM) models improved by three metaheuristic algorithms known as grey wolf optimizer (GWO), whale optimization algorithm (WOA)
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Ethylenediamine tetramethylenephosphonic acid as a selective collector for the improved separation of chalcopyrite against pyrite at low alkalinity Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-06-14 Jianjun Wang, Gaogui Jing, Renji Zheng, Zijie Huang, Wei Sun, Zhiyong Gao
Chalcopyrite is the main Cu-containing mineral and cannot be separated well from pyrite using traditional xanthate collectors with large amounts of lime depressant, resulting in difficulties of the tailing treatment and associated precious metals recovery. Therefore, in this study, the green and odourless ethylenediamine tetramethylenephosphonic acid (EDTMPA) was introduced as a novel chalcopyrite
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Effect of microwave-assisted acidification on the microstructure of coal: XRD, 1H-NMR, and SEM studies Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-06-14 He Li, Wuche Liu, Jiexin Lu, Yi Lu, Shiliang Shi, Zheng Wang, Qing Ye, Zhenzhen Jia
Microwave heating contributes to coal fracturing and gas desorption. However, problems of low penetration depth, local overheating and fracture closure exist. Coal demineralisation by acids has advantages in coal unblocking and permeability improvement, while it is difficult for acid to enter microcracks. Microwave-asisted acidification may offer an alternative. In this work, XRD, 1H-NMR, and SEM were
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Experimental study on the dispersion behavior of a microemulsion collector and its mechanism for enhancing low-rank coal flotation Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-06-14 Fan Lian, Guosheng Li, Yijun Cao, Baoxun Zhao, Guangli Zhu, Kai Fan
As the poor dispersion of oily collectors and the inferior hydrophobicity of the mineral surface, the low-rank coal has an unsatisfactory flotation performance when using traditional collectors. In this paper, an ionic liquid microemulsion was used as a collector to enhance its floatability. Flotation test results demonstrated the microemulsion collector exhibited a superior collecting ability. A satisfactory
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Ultrasound application in alkaline pretreatment process of spodumene to improve particle floatability Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-06-10 Haoran Chu, Lanlan Chen, Dongfang Lu, Yuhua Wang, Xiayu Zheng, Guangli Zhu
Selective surface dissolution was found to be important in spodumene flotation. In this study, we proposed to introduce ultrasound into the pretreatment process to accelerate particle vibration and cavitation, as well as the migration of mineral surface components to solution. Micro-flotation results showed that the flotation recovery of spodumene can be 86.08% by ultrasound pretreatment, but only
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Rock breaking performance of the newly proposed unsubmerged cavitating abrasive waterjet Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-06-08 Chenxing Fan, Haitao Zhang, Yong Kang, Hanqing Shi, Deng Li
To improve the rock breaking ability, cavitating waterjet and abrasive waterjet are combined by using a coaxial low-speed waterjet generated around the periphery of a high-speed abrasive waterjet, and a new type of waterjet called unsubmerged cavitating abrasive waterjet (UCAWJ) is thus produced. The rock breaking performance of UCAWJ was compared with submerged cavitating abrasive waterjet (SCAWJ)
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Propagation and sealing efficiency of chemical grouting in a two-dimensional fracture network with flowing water Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-06-03 Guosheng Zheng, Wanghua Sui, Gailing Zhang, Jiaxing Chen, Dingyang Zhang
In this study, an orthogonal array experiment is conducted by using a transparent fracture network replica. Image processing and theoretical analysis are performed to investigate the model sealing efficiency (SE), factors influencing SE, and the effect of flowing water on propagation. The results show that grout propagation can be classified into three patterns in the fracture network: sealing off
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On the impact of grinding conditions in the flotation of semi-soluble salt-type mineral-containing ores driven by surface or particle geometry effects? Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-06-02 Lucas Pereira, Nathalie Kupka, Duong Huu Hoang, Bruno Michaux, Sondos Saquran, Doreen Ebert, Martin Rudolph
Grinding and flotation processes are often studied independently, despite the well-established grinding influence on flotation performance, which affects not only particle size and thus liberation but also shape and leads to complex changes in pulp chemistry affecting the particle surface properties relevant for selective bubble attachment. Yet, no study jointly investigated these possible causes and
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Theoretical and numerical studies of rock breaking mechanism by double disc cutters Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-05-29 Yiqiang Kang, Renshu Yang, Liyun Yang, Chengxiao Li, Jun Chen, Haonan Zhu, Ning Liu
A plane mechanical model of rock breaking process by double disc cutter at the center of the cutterhead is established based on contact mechanics to analyze the stress evolution in the rock broken by cutters with different spacings. A continuous-discontinuous coupling numerical method based on zero-thickness cohesive elements is developed to simulate rock breaking using double cutters. The process
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A novel elastoplastic model for Yunnan sandstone under poly-axial loading Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-05-29 Xu Li, Guangyao Si, Joung Oh, Ismet Canbulat, Rui Kong, Jian Zhang
The lack of understanding of plastic hardening (softening) laws, especially under anisotropic stress conditions, results in inappropriate geotechnical management. Most of the yielding envelopes do not consider the effect of intermediate principal stress and the influence of Lode’s angle. In addition, the application of plastic flow rules regarding yielding surfaces compromises the softening of rock
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Mechanical properties and influence mechanism of confined concrete arches in high-stress tunnels Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-05-27 Bei Jiang, Zhongxin Xin, Xiufeng Zhang, Yusong Deng, Mingzi Wang, Shidong Li, Wentao Ren
Deep underground projects (e.g., coal mines), are often faced with complex conditions such as high stress and extremely soft rock. The strength and rigidity of the traditional support system are often insufficient, which makes it difficult to meet the requirements of ground control under complex conditions. As a new support form with high strength and rigidity, the confined concrete arch plays an important
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Removal of dolomite and potassium feldspar from apatite using simultaneous flotation with a mixed cationic-anionic collector Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-05-22 Haoyong Yu, Yangge Zhu, Liang Lu, Xiaoxing Hu, Songqing Li
This study aims to investigate the effect of a cationic-anionic mixed collector (dodecyltrimethyl ammonium bromide/sodium oleate (DTAB/NaOL) on the selective separation of apatite, dolomite, and potassium feldspar. Herein, several experimental methods, including flotation experiments, zeta-potential detection, microcalorimetry detection, XPS analysis and FTIR measurements, were used. The flotation
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Poroelastodynamic responses and elastic moduli of a transversely isotropic porous cylinder under forced deformation test Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-05-20 Chao Liu, Dung T. Phan
Existing transversely isotropic poroelastodynamics solutions are limited to infinite domains and without experimental validation. Furthermore, there is a lack of analytical simulations for the elastic moduli dispersion of fluid-saturated porous cylinders. To address these three limitations and investigate the mechanisms of moduli dispersion, we present the analytical solutions of the poromechanical
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Real-time ore sorting using color and texture analysis Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-04-27 David G. Shatwell, Victor Murray, Augusto Barton
Sensor-based ore sorting is a technology used to classify high-grade mineralized rocks from low-grade waste rocks to reduce operation costs. Many ore-sorting algorithms using color images have been proposed in the past, but only some validate their results using mineral grades or optimize the algorithms to classify rocks in real-time. This paper presents an ore-sorting algorithm based on image processing
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Research on the feasibility of storage and estimation model of storage capacity of CO2 in fissures of coal mine old goaf Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-04-20 Yang Ding, Shugang Li, Bing Zhu, Haifei Lin, Jingfei Zhang, Junhong Tan, Wenbin Chen
The concept of the carbon cycle in the old goaf of a coal mine based on CO2 utilization and storage was put forward adhering to the principle of low-carbon development, utilization of space resources in old goafs, and associated gas resources development. Firstly, the evolution characteristics of overburden fissures in the goaf of the case was studied using a two-dimensional physical similarity simulation
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Application of EDTMPS as a novel calcite depressant in scheelite flotation Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-04-17 Fen Jiao, Wei Li, Xu Wang, Congren Yang, Zhengquan Zhang, Liwen Fu, Wenqing Qin
In this study, the innovative use of ethylenediamine tetramethylene phosphonic sodium (EDTMPS) as a calcite depressant in scheelite flotation was investigated by flotation experiments, and its selective depression mechanism was revealed by contact angle measurement, FTIR analysis, Zeta potential test and XPS analysis. The flotation experiment results showed that scheelite and calcite could be efficiently
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Visualization and early warning analysis of damage degree of surrounding rock mass in underground powerhouse Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-04-15 Yuepeng Sun, Haijian Su, Peiwei Xiao, Peng Li, Biao Li, Xiang Zhou, Kaiqi Bian, Nuwen Xu
Based on the underground powerhouse of Shuangjiangkou hydropower station, Octree theory is adopted to define the indices of the microseismic (MS) spatial aggregation degree and the deviation values of MS count and energy. The relationship between the MS multiple parameters and surrounding rock mass instability is established from three aspects: time, space, and strength. Supplemented by the center
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Gleaning insights from German energy transition and large-scale underground energy storage for China’s carbon neutrality Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-04-13 Yachen Xie, Xuning Wu, Zhengmeng Hou, Zaoyuan Li, Jiashun Luo, Christian Truitt Lüddeke, Liangchao Huang, Lin Wu, Jianxing Liao
The global energy transition is a widespread phenomenon that requires international exchange of experiences and mutual learning. Germany’s success in its first phase of energy transition can be attributed to its adoption of smart energy technology and implementation of electricity futures and spot marketization, which enabled the achievement of multiple energy spatial–temporal complementarities and
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Experimental study of the dynamic mechanical responses and failure characteristics of coal under true triaxial confinements Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-04-13 Zhanguo Ma, Pengfei Yan, Shixing Cheng, Peng Gong, Fuzhou Qi, Jianguo Wang
Investigations on the dynamic mechanical properties and failure mechanisms of coal under in-situ stress is essential for the prevention of dynamic disasters in deep coal mines. Thus, a modified true triaxial Hopkinson bar was employed to explore the dynamic mechanical behaviors of coal at different confining pressures (0–20 MPa) and strain rates (40–220 s−1). The results show that the dynamic peak
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Pore-scale modeling of pore structure properties and wettability effect on permeability of low-rank coal Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-04-12 Xiangjie Qin, Jianchao Cai, Gang Wang
Permeability is a key parameter for coalbed methane development. Although the absolute permeability of coal has been extensively studied, wettability and pore structure properties continue to challenge the microscopic description of water-gas flow in coal. For this purpose, we reconstructed the microstructures of low-rank coal using micro-computed tomography (micro-CT) images. Pore geometry and pore-throat
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Vibration reduction technology and the mechanisms of surrounding rock damage from blasting in neighborhood tunnels with small clearance Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-04-11 Xiaodong Wu, Min Gong, Haojun Wu, Guangfeng Hu, Sijie Wang
Interlaid rock is an important component in the construction of neighborhood tunnels that supports and reinforces the area between two tunnels. However, the blasting load during excavation can sometimes damage the interlaid rock and threaten the stability of a tunnel’s structure. This paper presents a case study of the small clearance section of the Liantang highway tunnel project in Shenzhen, China
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Rock mass structural recognition from drill monitoring technology in underground mining using discontinuity index and machine learning techniques Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-30 Alberto Fernández, José A. Sanchidrián, Pablo Segarra, Santiago Gómez, Enming Li, Rafael Navarro
A procedure to recognize individual discontinuities in rock mass from measurement while drilling (MWD) technology is developed, using the binary pattern of structural rock characteristics obtained from in-hole images for calibration. Data from two underground operations with different drilling technology and different rock mass characteristics are considered, which generalizes the application of the
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Permeability evolution and gas flow in wet coal under non-equilibrium state: Considering both water swelling and process-based gas swelling Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-28 Zhiyong Xiao, Gang Wang, Changsheng Wang, Yujing Jiang, Feng Jiang, Chengcheng Zheng
Accurate knowledge of gas flow within the reservoir and related controlling factors will be important for enhancing the production of coal bed methane. At present, most studies focused on the permeability evolution of dry coal under gas adsorption equilibrium, gas flow and gas diffusion within wet coal under the generally non-equilibrium state are often ignored in the process of gas recovery. In this
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Effect of hydrogen peroxide on selective flotation of chalcocite and enargite Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-28 Gde Pandhe Wisnu Suyantara, Daniyarov Berdakh, Hajime Miki, Tsuyoshi Hirajima, Keiko Sasaki, Daishi Ochi, Yuji Aoki
Enargite is typically associated with chalcocite. Owing to the similarity in the flotation behaviors of these minerals, both minerals are reported to concentrate in the conventional flotation circuit. However, inorganic arsenic in enargite can decrease the copper concentrate quality and increase the operating cost of processing this concentrate. Separating these minerals is important for cleaner copper
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Mechanical properties and damage constitutive model of sandstone after acid corrosion and high temperature treatments Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-27 Qijian Chen, Youliang Chen, Peng Xiao, Xi Du, Yungui Pan, Rafig Azzam
Aiming at the problem of temperature-mechanics-chemical (T-M-C) action encountered by rocks in underground engineering, sandstone was selected as the sample for acid corrosion treatment at pH 1, 3, 5 and 7, the acid corrosion treated samples were then subjected to high-temperature experiments at 25, 300, 600, and 900 °C, and triaxial compression experiments were conducted in the laboratory. The experimental
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Synergistic activation of smithsonite with copper-ammonium species for enhancing surface reactivity and xanthate adsorption Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-27 Wenjuan Zhao, Bin Yang, Yahui Yi, Qicheng Feng, Dianwen Liu
Copper ions (Cu2+) are usually added to activate the sulfidized surface of zinc oxide minerals to enhance xanthate attachment using sulfidization xanthate flotation technology. The adsorption of Cu2+ and xanthate on the sulfidized surface was investigated in various systems, and its effect on the surface hydrophobicity and flotation performance was revealed by multiple analytical methods and experiments
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Estimation of the unfrozen water content of saturated sandstones by ultrasonic velocity Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-27 Shibing Huang, Fei Liu, Gang Liu, Shilin Yu
The unfrozen water content (UWC) of rocks at low temperature is an important index for evaluating the stability of the rock engineering in cold regions and artificial freezing engineering. This study addresses a new method to estimate the UWC of saturated sandstones at low temperature by using the ultrasonic velocity. Ultrasonic velocity variations can be divided into the normal temperature stage (20
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A consecutive joint shear strength model considering the 3D roughness of real contact joint surface Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-23 Liren Ban, Zhigang Tao, Weisheng Du, Yuhang Hou
A consecutive joint shear strength model for soft rock joints is proposed in this paper, which takes into account the degradation law of the actual contact three-dimensional (3D) roughness. The essence of the degradation of the maximum possible dilation angle is the degradation of the 3D average equivalent dip angle of the actual contact joint asperities. Firstly, models for calculating the maximum
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Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental study Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-22 Fen Xu, Shiwei Wang, Rongjie Kong, Chengyong Wang
The utilization of an appropriate collector or surfactant is crucial for the beneficiation of low-rank coal. However, in previous studies, the selection of surfactants was primarily based on flotation procedures, which hinders the understanding of the interaction mechanism between surfactant groups and oxygen-containing functional groups at the surface of low-rank coal. In this study, we investigate
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In-situ observations of damage-fracture evolution in surrounding rock upon unloading in 2400-m-deep tunnels Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-17 Haosen Guo, Qiancheng Sun, Guangliang Feng, Shaojun Li, Yaxun Xiao
The damage-fracture evolution of deep rock mass has obvious particularity, which is revealed in 2400-m-deep tunnels by field tests. The evolution of the excavation damaged zone depth is consistent with that of the fractured zone depth. The ratio of the excavation damaged zone depth to the excavation fractured zone depth is greater than 2.0 in a rock mass with both high strength and good integrity,
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Experimental research and energy analysis of a new type of dry ice powder pneumatic rock breaking technology Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-16 Xiaofei Wang, Shaobin Hu, Enyuan Wang, Qiang Zhang, Bing Liu
When the traditional drill and blast method is applied to rock crushing projects, it has strong vibration, loud noise and dust pollution, so it cannot be used in densely populated areas such as urban public works. We developed a supercritical CO2 true triaxial pneumatic rock-breaking experimental system, and conducted laboratory and field tests of dry ice powder pneumatic rock-breaking. The characteristics
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Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-07 Zhixiang Song, Junwen Zhang, Yang Zhang, Xukai Dong, Shanyong Wang
The quantitative determination and evaluation of rock brittleness are crucial for the estimation of excavation efficiency and the improvement of hydraulic fracturing efficiency. Therefore, a “three-stage” triaxial loading and unloading stress path is designed and proposed. Subsequently, six brittleness indexes are selected. In addition, the evolution characteristics of the six brittleness indexes selected
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Experimental study on unloading induced shear performances of 3D saw-tooth rock fractures Int. J. Min. Sci. Technol. (IF 11.8) Pub Date : 2023-03-04 Qian Yin, Xinxin Nie, Jiangyu Wu, Qi Wang, Kaiqi Bian, Hongwen Jing
A fractal model governing saw-tooth fractures was first introduced to replicate sandstone samples containing an inclined 3D penetrating rough fracture surface with various joint roughness coefficients (JRC). In conventional triaxial compression, the peak strength for fractured samples increased with both confining pressure and JRC. During the unloading confining pressure process, the normal stress