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矿业科学技术学报（英文版）
矿业科学技术学报（英文版）

骆振福

双月刊

2095-2686

journal@cumt.edu.cn

0516-83885569

221008

江苏省徐州市中国矿业大学内

矿业科学技术学报（英文版）/Journal International Journal of Mining Science and TechnologyCSCDCSTPCD北大核心EISCI
正式出版
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    A new scientific explanation to rock fracture-induced electromagnetic radiation process

    Xueqiu HeXianghui TianZhenlei LiMenghan Wei...
    1485-1493页
    查看更多>>摘要：The electromagnetic radiation (EMR) monitoring and early warning technology has experienced decades of successful applications for worldwide coal and rock dynamic disasters,yet a fundamental model uni-fying physical mechanism and generation process for EMR is still lacking.The effective revealing of EMR's mechanism is crucial for dynamic disaster control and management.With this motive,a multi-scale experimental study was conducted in the earlier stage.At the micro-scale,the charge's existence and non-uniform distribution on rock's micro-surface were confirmed by atomic force microscope (AFM),and deduced the relationship with load changes.At the meso-scale,the time sequence synchronization and frequency domain consistency of EMR and micro-vibration (MV) in the rock fracture under load have been confirmed.Therefore,it is inferred that the vibration of the crack surface acts as the power source of rock fracture-induced EMR,and the original charge on the crack surface and the charge generated by the new crack surface are the electrical basis of EMR.Based on the above two experimental findings,this paper proposes a new mechanism of rock fracture-induced EMR defined as the electricity-vibration cou-pling mechanism,stating that,the vibrating charged crack generates the EMR.Subsequently,a generation model was constructed based on vibrating charged crack clusters to elucidate this mechanism.The exper-imental results demonstrated that the EMR waveform calculated by the model and measured by antenna exhibited good correspondence,thereby verifying the effectiveness of the constructed EMR model.The proposal of this new mechanism and the model further clarified the EMR's mechanism induced by rock fracture.Moreover,the inter-relationship among crack propagation,vibration,and EMR was developed by this model,which could be immensely beneficial in EMR-based identification and prediction of dynamic disasters in complex mining environments worldwide.
      原文链接:
    • 万方数据
    • 维普

    Experimental study on permeability evolution of deep high-stressed coal under major horizontal stress unloading paths

    Chao LiuJiahao ZhangSongwei WuJinghua Qi...
    1495-1508页
    查看更多>>摘要：Both bulk stress (σⅱ) and stress path (SP) significantly affect the transportation characteristics of deep gas during reservoir pressure depletion.Therefore,the experimental study of horizontal stress unloading on seepage behavior of gas-bearing coal under constantσⅱ-constraints is performed.The results show that coal permeability is affected by horizontal stress anisotropy (σH≠σh),and the contribution of minor hor-izontal stress to permeability is related to the differential response of horizontal strain.The slippage phe-nomenon is prominent in deep high-stress regime,especially in low reservoir pressure.σⅱ and SP jointly determine the manifestation of slippage effect and the strength of stress sensitivity (γ) of permeability.Deep reservoir implies an incremental percentage of slip-based permeability,and SP weakens the slip-page effect by changing the elastic-plastic state of coal.However,γis negatively correlated with slippage effect.From the Walsh model,narrow (low aspect-ratio) fractures within the coal under unloading SP became the main channel for gas seepage,and bring the effective stress coefficient of permeability (x) less than 1 for both low-stress elastic and high-stress damaged coal.With the raise of the effective stress,the effect of pore-lined clay particles on permeability was enhanced,inducing an increase in x for high-stress elastic coal.
      原文链接:
    • 万方数据
    • 维普

    Instability mechanisms of slope in open-pit coal mines:From physical and numerical modeling

    Guanghe LiZihuan HuDong WangLaigui Wang...
    1509-1528页
    查看更多>>摘要：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 char-acteristics 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 and 0.72-1.00,respectively.These findings contribute to a better understanding of the instability mecha-nisms in open-pit mine slopes with weak interlayers and provide valuable guidelines for safe mining practices.
      原文链接:
    • 万方数据
    • 维普

    Experimental investigation on the macro-mechanical behavior and micromechanical damage model of Xiyu conglomerate with pores and inclusions under triaxial compression

    Yajun CaoXuelei DuanWei WangQizhi Zhu...
    1529-1549页
    查看更多>>摘要：The complex and special mechanical properties of Xiyu conglomerate are of great significance to the con-struction of water conservancy and hydropower engineering.The crack characteristic stress,dilatancy behavior,and failure mechanism of Xiyu conglomerate collected from Momoke Water Control Project,southwestern China,were analyzed and discussed based on the experimental results of triaxial compres-sion test and 3D X-ray computed tomography test.The results show that with increasing confining pres-sure,the deformation characteristics and all characteristic stresses increase monotonically,while the dilation angle and dilatancy index decrease,and exponential function model can accurately describe the evolution rule of dilatancy index with confining pressure.While the porosity is negatively correlated with confining pressure.The failure modes of Xiyu conglomerate include axial tensile cracks,shear cracks,local cross cracks and cracks around gravel.With increasing confining pressure,the failure modes transform from tension cracks to shear cracks.A non-associated micromechanical damage model consid-ering pressure dependent matrix presenting tension-compression asymmetry is proposed and applied to Xiyu conglomerate with pores and a large number of gravels.By comparing numerical calculations and experimental results,the proposed micromechanical plastic damage model is able to describe the mechanical behavior of Xiyu conglomerate.
      原文链接:
    • 万方数据
    • 维普

    Evaluation of the migration and environmental effects of metal elements within cementitious gangue-fly ash backfill in underground coal mines

    Xuejie DengYuan JiaoShicong LiNan Zhou...
    1551-1562页
    查看更多>>摘要：Cementitious gangue-fly ash backfill (CGB) is used as a green mining technology worldwide.However,under the coupled effects of geological stress and groundwater,the metal elements in the CGB tend to migrate into nearby strata,which can consequently result in pollution of the groundwater environment.In this paper,the influence of initial pH and stress damage on the migration behavior of metal elements in CGB is quantitatively studied through the multi-physical field coupling model of stress-permeability-con centration.The enhanced Nemerow index evaluation method is used to comprehensively evaluate the impact of these metal elements migration behaviors on the groundwater environment.The research results show that:(1) When the stress damage of the CGB increases from 0.76 to 0.95,the Darcy velocity at the bottom of the CGB first increases,then decreases,and finally stabilizes at 2.01107 m/s.The long-est time to reach the maximum Darcy velocity is 3 a.(2) When the damage of the CGB is 0.95,the farthest migration distances of Al,Cr,Mn,Fe,Ba,and Pb are 40.5,34.0,29.8,32.9,38.8 and 32.1 m,respectively.(3) The alkaline environment stimulates the migration of Al,Cr,Fe,Mn,and Pb,whereas Ba migrates farther under acidic conditions.The farthest migration distance of Ba is 31.6 m under pH 3.(4) The enhanced Nemerow index indicates that when stress damage increases from 0.76 to 0.95,the areas with poor water quality increase from 0 to 1.71％,and no area is classified as very poor grade.When the initial pH changes from 3 to 11,100％ of the region is classified as fair or above.The initial pH of the CGB has a relatively slight influence on the groundwater environment.This study provides experimental data and theoretical basis for the environmental evaluation of CGB.
      原文链接:
    • 万方数据
    • 维普

    Selective flocculation-flotation of ultrafine hematite from clay minerals under asynchronous flocculation regulation

    Fusheng NiuYuying ChenJinxia ZhangFei Liu...
    1563-1574页
    查看更多>>摘要：The clay mineral flocculation encapsulation poses a major technical challenge in the field of fine mineral separation.Enhancing the ability to separate clay minerals from target mineral surfaces is key to address-ing this issue.In the flotation process of ultrafine hematite,sodium polyacrylate (PAAS) was used as a selective flocculant for hematite,polyaluminum chloride (PAC) as a flocculant for kaolinite and chlorite,and sodium oleate (NaOL) as the collector to achieve asynchronous flocculation flotation.This study examines the flotation separation performance and validates it through experiments on actual mineral samples.The results indicate that with PAAS and PAC dosages of 1.25 and 50 mg L-1,respectively,the iron grade and recovery of the actual mineral samples increased by 9.39％ and 7.97％.Through Zeta poten-tial,XPS analysis,infrared spectroscopy,and total organic carbon (TOC) testing,the study reveals the microscopic interaction mechanisms of different flocculants with minerals,providing insights for the clean and efficient utilization of ultrafine mineral resources.
      原文链接:
    • 万方数据
    • 维普

    Influence mechanism of Fe3+doping on the hydrophobic regulation of kaolinite/water interface:Experiments and MD simulations

    Jun ChenHuanhuan ShangYunjia LingFeifei Jia...
    1575-1586页
    查看更多>>摘要：The surface/interfacial reactivity of clay is a critical factor influencing the sedimentation of coal slurry water.To achieve efficient sedimentation of coal slurry water,this paper introduces a novel approach that regulates the hydrophobicity of defective active sites in clay minerals.Fe3+-doped kaolinite (Fe3+-Kao) was synthesized by hydrothermal methods.Subsequently,tests were conducted on the adsorption capac-ity,surface wettability,and agglomeration sedimentation of alkyl amine/ammonium salts (AAS) on Fe3+-Kao surfaces.Fe3+doping significantly enhances AAS adsorption and alters surface properties from hydro-philic to hydrophobic,promoting kaolinite particle aggregation and sedimentation,thereby improving coal slurry water treatment efficiency.Molecular dynamics (MD) simulations were performed to analyze the statistical adsorption behavior of AAS on Fe3+-Kao surfaces.The simulation results indicate that the mechanism by which Fe3+doping influences the hydrophobic regulation of kaolinite surfaces is due to the enhanced interfacial interactions between the kaolinite surface and AAS,where the interfacial effects are more pronounced on surfaces closer to the dopant sites.The findings of this research offer valuable insights for future studies on other types of lattice defects in clay minerals,as well as for the development of more efficient treatment chemicals for coal slurry water.
      原文链接:
    • 万方数据

    Utilizing spatio-temporal feature fusion in videos for detecting the fluidity of coal water slurry

    Meijie SunZiqi LvZhiqiang XuHaimei Lv...
    1587-1597页
    查看更多>>摘要：The fluidity of coal-water slurry (CWS) is crucial for various industrial applications such as long-distance transportation,gasification,and combustion.However,there is currently a lack of rapid and accurate detection methods for assessing CWS fluidity.This paper proposed a method for analyzing the fluidity using videos of CWS dripping processes.By integrating the temporal and spatial features of each frame in the video,a multi-cascade classifier for CWS fluidity is established.The classifier distinguishes between four levels (A,B,C,and D) based on the quality of fluidity.The preliminary classification of A and D is achieved through feature engineering and the XGBoost algorithm.Subsequently,convolutional neural networks (CNN) and long short-term memory (LSTM) are utilized to further differentiate between the B and C categories which are prone to confusion.Finally,through detailed comparative experiments,the paper demonstrates the step-by-step design process of the proposed method and the superiority of the final solution.The proposed method achieves an accuracy rate of over 90％in determining the fluidity of CWS,serving as a technical reference for future industrial applications.
      原文链接:
    • 万方数据
    • 维普

    Advancing green flotation:Separation of Cu-Pb minerals through the application of eco-friendly organic double reaction group depressant

    Siqi YangXianping LuoRufeng ChenLouyan Shen...
    1599-1611页
    查看更多>>摘要：Achieving efficient flotation separation of chalcopyrite and galena while maintaining environmental friendliness poses a challenge.This study utilized the environmentally friendly copolymer acrylic acid-2-acrylamide-2-methylpropanesulfonic acid (AA/AMPS) as a depressant to separate chalcopyrite and galena.Flotation tests revealed a significant reduction in galena recovery when AA/AMPS was employed,with minimal impact observed on chalcopyrite.In artificial mixed ore flotation,AA/AMPS was found to enhance the efficiency of copper and lead separation,surpassing K2Cr2O7.Furthermore,the effectiveness of AA/AMPS in facilitating copper-lead separation has been validated in practical ore flotation.The pres-ence of AA/AMPS inhibited the adsorption of SBX onto galena,as confirmed by zeta potential and contact angle measurements.However,the adsorption on chalcopyrite remained unaffected.Through analyses using Atomic Force Microscope,X-ray photoelectron spectroscopy,and Density Functional Theory,a robust chemical interaction between the reactive groups in AA/AMPS and Pb sites on galena was uncov-ered,resulting in the formation of a hydrophilic polymer layer.This layer impedes SBX adsorption and reduces galena's floatability.In contrast,no significant chemical adsorption was observed between AA/AMPS and Cu and Fe sites on chalcopyrite,preserving its SBX affinity.Overall,AA/AMPS shows promise in replacing traditional depressants for Cu-Pb sulfide ore separation,enhancing environmental sustainability.
      原文链接:
    • 万方数据
    • 维普

    Enhancement of 2-hydroxy-3-naphthyl hydroxamic acid adsorption on bastnaesite and monazite surfaces using H2O2 pre-oxidation for improved flotation process

    Weiwei WangZhengyao LiAnhua ZouKai Gao...
    1613-1623页
    查看更多>>摘要：Rare earth elements have been widely applied in various sectors.Bastnaesite and monazite are crucial rare earth minerals,and flotation is a vital technique for recovering fine-grained rare earth minerals and separating them from associated gangue minerals such as fluorite and apatite.Flotation collectors play a key role in selectively adsorbing valuable minerals,enhancing their surface hydrophobicity,which has prompted considerable research interest.However,the interaction between minerals and reagents relies on the reactivity and selectivity of the reagent groups,as well as the reactive properties of the sur-face atoms of the minerals.This study proposes the use of H2O2 oxidation to enhance the flotation process of rare earth minerals.The flotation experiments demonstrated that pre-adding H2O2 before introducing the flotation collector significantly improved the grade and recovery of rare earth concentrates.The adsorption mechanisms of 2-hydroxy-3-naphthyl hydroxamic acid collector on rare earth mineral sur-faces before and after H2O2 pre-oxidation were studied.The 2-hydroxy-3-naphthyl hydroxamic acid interacts with Ce3+on the surface of unoxidized rare earth minerals,forming chelate compounds with five-membered ring structures.The H2O2 exhibited potent oxidizing properties and oxidized the Ce3+on the bastnaesite and monazite surfaces to more stable Ce4+,which demonstrated stronger binding capability with hydroxamic acid.
      原文链接:
    • 万方数据