首页期刊导航|矿业科学技术学报（英文版）
期刊信息/Journal information
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
收录年代

    Flotation and adsorption of novel Gemini decyl-bishydroxamic acid on bastnaesite:Experiments and density functional theory calculations

    Longhua XuChang LiuJiushuai DengDonghui Wang...
    1193-1202页
    查看更多>>摘要：Rare earth element is an important strategic metal,but the supply of high purity rare earth ores is grow-ing slowly,which is in sharp contradiction with the rapidly growing demand.Froth flotation has been confirmed to be an effective method to separate bastnaesite from its gangue minerls.However,the tra-ditional collectors are facing serious problems in flotation separation of minerals,requiring the addition of excess depressant and regulator in the flotation process.Herein,we proposed and synthesized novel Gemini hydroxamic acids Octyl-bishydroxamic acid(OTBHA),Decyl-bishydroxamic acid(DCBHA)and Dodecyl-bishydroxamic acid(DDBHA)as the collectors in bastnaesite-barite flotation system.The effect of different carbon chain lengths on the molecular properties were explored by density functional theory(DFT)calculations.DCBHA possessed a stronger reactivity compared with OCBHA and DDBHA.The flota-tion results verified the consistency of the computational calculation about the performance prediction of Gemini hydroxamic acids.Compared with OCBHA and DDBHA,DCBHA displayed superior collecting affinity toward bastnaesite,and did not float barite.Zeta potential results showed that the presence of DCBHA increased the potential of bastnaesite,while it had almost no effect on barite,indicating DCBHA had a stronger affinity for bastnaesite.Then,Fourier transform infrared(FTIR)and X-ray photo-electron spectroscopy(XPS)analyses indicated that the adsorption mechanism was due to two hydrox-amate groups of DCBHA co-anchored on bastnaesite surface by forming five-membered hydroxamic-(O-O)—Ce complexes.In addition,atomic force microscopy(AFM)clearly observed that DCBHA uni-formly aggregated on bastnaesite surface,which increased surface contact angle and improved the hydrophobicity of bastnaesite.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Microseismic event waveform classification using CNN-based transfer learning models

    Longjun DongHongmei ShuZheng TangXianhang Yan...
    1203-1216页
    查看更多>>摘要：The efficient processing of large amounts of data collected by the microseismic monitoring system(MMS),especially the rapid identification of microseismic events in explosions and noise,is essential for mine disaster prevention.Currently,this work is primarily performed by skilled technicians,which results in severe workloads and inefficiency.In this paper,CNN-based transfer learning combined with computer vision technology was used to achieve automatic recognition and classification of multi-channel microseismic signal waveforms.First,data collected by MMS was generated into 6-channel orig-inal waveforms based on events.After that,sample data sets of microseismic events,blasts,drillings,and noises were established through manual identification.These datasets were split into training sets and test sets according to a certain proportion,and transfer learning was performed on AlexNet,GoogLeNet,and ResNet50 pre-training network models,respectively.After training and tuning,optimal models were retained and compared with support vector machine classification.Results show that trans-fer learning models perform well on different test sets.Overall,GoogLeNet performed best,with a recog-nition accuracy of 99.8％.Finally,the possible effects of the number of training sets and the imbalance of different types of sample data on the accuracy and effectiveness of classification models were discussed.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Mechanical properties and damage characteristics of solidified body-coal combination in continuous driving and gangue backfilling

    Yi TanHao ChengWenbing GuoErhu Bai...
    1217-1228页
    查看更多>>摘要：Recovery of the coal buried under buildings,railways and water bodies and the residual coal in irregularly arranged fully mechanized mining faces is a common engineering problem facing underground coal min-ing.In this study,a mining technology of continuous driving and gangue backfilling(CDGB)was pro-posed.The technology,which can not only alleviate ground subsidence and gangue discharge,but also release the above-mentioned coals,contributes to green and efficient sustainable development of mining.The stability of the system of the solidified body-reserved coal pillar combination(S-C combination)is crucial to the CDGB technology.Therefore,it is of great significance to explore the mechanical and dam-age characteristics of S-C combination in the synergistic bearing process.First,four sets of different-shaped S-C combination specimens were fabricated and a S-C combination bearing structure in CDGB was constructed to explore the differences in mechanical characteristics and damage modes of different-shaped S-C combination specimens during CDGB.Subsequently,their surface strain field evolu-tions and acoustic emission(AE)response characteristics in the load-bearing process were obtained with the aid of the digital image correlation technique and the AE signal monitoring system.Furthermore,a damage evolution model based on AE parameters and mechanical parameters was established to clarify the damage evolution law.The following results were obtained:(1)The free area of S-C combination can serve as a quantitative index to evaluate the stability of the overburden control system;(2)The concept of critical value k of the free area was first proposed.When the free area exceeds the critical value k(free area ratio greater than 1.13),the deformation resistance and the free area changes becomes negatively correlated;(3)As the free area expands,the failure of the S-C combination specimen evolves from tensile failure to shear failure.The distribution characteristics of the axial strain field also verified such a change in the failure mode;(4)When the free area expands,the peak AE count gradually changes from"double peaks"to"a single peak".In this process,the expansion of free area shortens the time for accumulating and releasing energy during loading.Micro cracks generated in the specimen change from a phased steep growth to a continuous increase,and the process in which micro cracks develop,converge,intersect and connect to form macro cracks accelerates.The damage evolution law concluded based on AE parameters and mechanical parameters can well characterize the damage evolution process of S-C combination,pro-viding certain reference for the study on the synergistic bearing of S-C combination during CDGB.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Polysaccharides-based pyrite depressants for green flotation separation:An overview

    A.Asimi NeisianiR.SaneieA.MohammadzadehD.G.Wonyen...
    1229-1241页
    查看更多>>摘要：Froth flotation is an essential processing technique for upgrading low-grade ores.Flotation separation would not be efficient without chemical surfactants(collectors,depressants,frothers,etc.).Depressants play a critical role in the selective separation of minerals in that they deactivate unfavorable mineral sur-faces and hinder them from floating into the flotation concentration zone.Pyrite is the most common and challenging sulfide gangue,and its conventional depressants could be highly harmful to nature and humans.Therefore,using available,affordable,eco-friendly polymers to assist or replace hazardous reagents is mandatory for a green transition.Polysaccharide-based(starch,dextrin,carboxymethyl cellu-lose,guar gum,etc.)polymers are one of the most used biodegradable depressant groups for pyrite depres-sion.Despite the satisfactory flotation results obtained using these eco-friendly depressants,several gaps still need to be addressed,specifically in investigating surface interactions,adsorption mechanisms,and parameters affecting their depression performance.As a unique approach,this review comprehensively discussed previously conducted studies on pyrite depression with polysaccharide-based reagents.Additionally,practical suggestions have been provided for future assessments and developments of polysaccharide-based depressants,which pave the way to green flotation.This robust review also explored the depression efficiency and various adsorption aspects of naturally derived depressants on the pyrite surface to create a possible universal trend for each biodegradable depressant derivative.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Experimental study on instability mechanism and critical intensity of rainfall of high-steep rock slopes under unsaturated conditions

    Xiaoshuang LiQihang LiYunmin WangWei Liu...
    1243-1260页
    查看更多>>摘要：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 rock slopes under unsaturated conditions.The real-time reproduction of the progressive failure process in high-steep rock slopes enabled the determination of the critical rainfall intensity and revealed the mechanism underlying slope instability.Experiment results indicated that rainfall may be the primary factor contributing to rock mass instability,while continuous pillar mining exacerbates the extent of rock mass failure.The critical failure stage of high-steep rock slopes occurs at a rainfall intensity of 40 mm/h,whereas a rainfall exceed-ing 50 mm can induce critical instability and precipitation reaching up to 60 mm will result in slope fail-ure.The improved region growing segmentation method(IRGSM)was subsequently employed for image recognition of rock mass deformation in underground mines.Herein an error comparison with the simple linear iterative cluster(SLIC)superpixel method and the original region growing segmentation method(ORGSM)showed that the average identification error in the X and Y directions by the method was reduced significantly(1.82％and 1.80％in IRGSM;4.70％and 6.26％in SLIC;9.45％and 12.40％in ORGSM).Ultimately,the relationship between rainfall intensity and failure probability was analyzed using the Monte Carlo method.Moreover,the stability assessment criteria of rock slope under unsatu-rated condition were quantitatively and accurately evaluated.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Effect of particle gradation on pore structure and seepage law of solution in weathered crust elution-deposited rare earth ores

    Defeng LiuWenxin YanZhenyue ZhangRuan Chi...
    1261-1272页
    查看更多>>摘要：Both CT and Avizo software were used to explore the effect of particle gradation on the evolution char-acteristics of pore structure and seepage paths in weathered crust elution-deposited rare earth ores dur-ing leaching.The results showed that the pore areas in four kinds of ore samples before leaching were mainly concentrated in 104-107 μm2,whose pore quantities accounted for 96.89％,94.94％,90.48％,and 89.45％,respectively,while the corresponding pore volume only accounted for 30.74％,14.55％,7.58％,and 2.84％of the total pore volume.With the decrease of fractal dimension,the average pore throat length increased,but pore throat quantities,the average pore throat radius and coordination number decreased.Compared with that before leaching,the change degree of pore structure during leaching increased with the fractal dimension decreasing.For example,the reduction rate of the average coordination number of ore samples was 14.36％,21.30％,28.00％,and 32.90％,respectively.Seepage simulation results indicated that seepage paths were uniformly distributed before leaching while the streamline density and seepage velocity increased with the fractal dimension decreasing.Besides,the phenomenon of the streamline interruption gradually reduced during leaching while preferential seepage got more obvious with the decrease of the fractal dimension.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Numerical modeling on strain energy evolution in rock system interaction with energy-absorbing prop and rock bolt

    Yang HaoChunhui LiuYu WuHai Pu...
    1273-1288页
    查看更多>>摘要：The interaction mechanism between coal and rock masses with supporting materials is significant in roadway control,especially in deep underground mining situations where dynamic hazards frequently happened due to high geo-stress and strong disturbed effects.This paper is to investigate the strain energy evolution in the interaction between coal and rock masses with self-designed energy-absorbing props and rock bolts by numerical modeling with the finite difference method.The interaction between rock and rock bolt/prop is accomplished by the cables element and the interface between the inner and outer props.Roadway excavation and coal extraction conditions in deep mining are numerically employed to investigate deformation,plastic zone ranges,strain energy input,accumulation,dissipation,and release.The effect on strain energy input,accumulation,dissipation,and release with rock deforma-tion,and the plastic zone is addressed.A ratio of strain energy accumulation,dissipation,and release with energy input α,β,γ is to assess the dynamic hazards.The effects on roadway excavation and coal extrac-tion steps of α,β,γ are discussed.The results show that:(1)In deep high geo-stress roadways,the energy-absorbing support system plays a dual role in resisting deformation and reducing the scope of plastic zones in surrounding rock,as well as absorbing energy release in the surrounding rock,especially in the coal extraction state to mitigate disturbed effects.(2)The strain energy input,accumulation is depen-dent on roadway deformation,the strain energy dissipation is relied on plastic zone area and disturbed effects,and strain energy release density is the difference among the three.The function of energy-absorbing rock bolts and props play a key role to mitigate strain energy release density and amount,espe-cially in coal extraction condition,with a peak density value from 4×104 to 1×104J/m3,and amount value from 3.57×108 to 1.90×106 J.(3)When mining is advanced in small steps,the strain energy accumulation is dominated.While in a large step,the released energy is dominant,thus a more dynamic hazards prone-ness.The energy-absorbing rock bolt and prop can reduce three times strain energy release amount,thus reducing the dynamic hazards.The results suggest that energy-absorbing props and rock bolts can effec-tively reduce the strain energy in the coal and rock masses,and prevent rock bursts and other hazards.The numerical model developed in this study can also be used to optimize the design of energy-absorbing props and rock bolts for specific mining conditions.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Selective flotation of chalcopyrite from pyrite via seawater oxidation pretreatment

    Wanqing LiYubiao LiZhonghong WangXu Yang...
    1289-1300页
    查看更多>>摘要：The flotation separation of chalcopyrite from pyrite has attracted increasing attention due to the con-sumption of vast water resources and depressants.This study proposed the seawater oxidation pretreat-ment for non-depressant flotation separation of chalcopyrite from pyrite,as an effective and environmentally friendly strategy.Without the addition of depressants,seawater oxidation for 3 d effec-tively depressed pyrite flotation,with the highest recovery difference greater than 70％and a selectivity index greater than 6 between chalcopyrite and pyrite.The surface investigation showed that pyrite sur-face was more readily oxidized to form hydrophilic Fe oxidants/oxyhydroxides,as compared to that of chalcopyrite.Further UV-visible spectrophotometer and Fourier transform infrared spectrum(FTIR)results indicated that xanthate was less adsorbed onto the treated pyrite surface,resulting in un-floatable particles.Chalcopyrite surface was changed slightly due to seawater oxidation,thereby insignif-icantly affecting its flotation.The coordination theory was further used to reveal the combination mech-anisms between xanthate and pyrite or chalcopyrite.This study therefore provides a promising strategy to effectively separate chalcopyrite from pyrite,especially in the freshwater-deficient area.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Shear behaviours and roughness degeneration based on a quantified rock joint surface description

    Shubo ZhangGang WangYujing JiangChangsheng Wang...
    1301-1316页
    查看更多>>摘要：The asperity wear of rock joints significantly affects their shear behaviour.This study discusses the wear damage of the asperities on the joint surface,highlighting the roughness degradation characteristics dur-ing the shear process.The direct shear experiment of artificial specimens containing rock joints was con-ducted under different normal stresses based on three-dimensional scanning technology.These experimental results showed the contribution of joint wear to roughness degeneration,such as the height,zone,and volume of asperity degeneration.The wear coefficient of the rock joint was obtained based on the volume wear of asperities in the laboratory experiment.The functional relationship between the friction coefficient and wear coefficient is subsequently determined.To quantitatively anal-yse the wear damage of a joint surface,a calculation method for determining the wear depth of the rock joint after shearing was proposed based on wear theory.The relationship between the ultimate dilation and wear depth was analysed.A coefficient m,which can describe the damage degree of the joint surface,and a prediction method of joint surface roughness after shearing are established.Good agreement between analytical predictions and measured values demonstrates the capability of the developed model.Lastly,the sensitivity factors on the wear depth are explored.
      原文链接:
    • NETL
    • NSTL
    • 万方数据