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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
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    Experimental study on the deformation behaviour,energy evolution law and failure mechanism of tectonic coal subjected to cyclic loads

    Deyi GaoShuxun SangShiqi LiuJian Wu...
    1301-1313页
    查看更多>>摘要：Compared to intact coal,tectonic coal exhibits unique characteristics.The deformation behaviours under cyclic loading with different confining pressures and loading rates are monitored by MTS815 test system,and the mechanical and energy properties are analysed using experimental data.The results show that the stress-strain curve could be divided into four stages in a single cycle.The elastic strain and elastic energy density increase linearly with deviatoric stress and are proportional to the confining pressure and loading rate;irreversible strain and dissipated energy density increase exponentially with deviatoric stress,inversely proportional to the confining pressure and loading rate.The internal structure of tectonic coal is divided into three types,all of which are damaged under different deviatoric stress levels,thereby explaining the segmentation phenomenon of stress-strain curve of tectonic coal in the cyclic loading pro-cess.Tectonic coal exhibits nonlinear energy storage characteristics,which verifies why the tectonic coal is prone to coal and gas outburst from the principle of energy dissipation.In addition,the damage mech-anism of tectonic coal is described from the point of energy distribution by introducing the concepts of crushing energy and friction energy.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Evaluation and intelligent deployment of coal and coalbed methane coupling coordinated exploitation based on Bayesian network and cuckoo search

    Quanle ZouZihan ChenZhiheng ChengYunpei Liang...
    1315-1328页
    查看更多>>摘要：Coal and coalbed methane(CBM)coordinated exploitation is a key technology for the safe exploitation of both resources.However,existing studies lack the quantification and evaluation of the degree of coordi-nation between coal mining and coalbed methane extraction.In this study,the concept of coal and coalbed methane coupling coordinated exploitation was proposed,and the corresponding evaluation model was established using the Bayesian principle.On this basis,the objective function of coal and coalbed methane coordinated exploitation deployment was established,and the optimal deployment was determined through a cuckoo search.The results show that clarifying the coupling coordinated level of coal and coalbed methane resource exploitation in coal mines is conducive to adjusting the deploy-ment plan in advance.The case study results show that the evaluation and intelligent deployment method proposed in this paper can effectively evaluate the coupling coordinated level of coal and coalbed methane resource exploitation and intelligently optimize the deployment of coal mine operations.The optimization results demonstrate that the safe and efficient exploitation of coal and CBM resources is promoted,and coal mining and coalbed methane extraction processes show greater cooperation.The observations and findings of this study provide a critical reference for coal mine resource exploitation in the future.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Insights into the floatability between spodumene and albite from crystal chemistry standpoint

    Hepeng ZhouFanxin XieYongbing ZhangBoyuan Zhang...
    1329-1339页
    查看更多>>摘要：Spodumene is a silicate mineral rich in lithium.However,the gangue mineral,albite has similar crystal chemical structure and composition to spodumene.In this work,the density functional theory(DFT)cal-culation was taken to research the floatability from the perspective of crystal chemistry.And contact angle test and reagent adsorption test were used to support the simulation results.In addition,the weighted total density of broken bonds is proposed for the first time to judge the generation probability of cleavage surface.The DFT calculation results display that the Na and Al sites on the albite surface are the adsorption sites of water molecules.While the water molecules only bond with Al atom on the sur-face of spodumene and each Al site can adsorb only one water molecule.Thus,the wetting effect of water molecules on the albite surface is stronger than that of spodumene.This is consistent with the result of contact angle.In sodium oleate system,the oleic acid anion is adsorbed on the spodumene surface in form of a multicomponent ring while the albite is a single ring.Theoretically,oleic acid anion can be strongly adsorbed on the surface of spodumene and albite under vacuum.The adsorption strength of spo-dumene is higher than that of albite.However,on hydrated surface,the adsorption strength of oleic acid anion on mineral surface is greatly reduced due to the interaction between water molecules and metal site on mineral surface.Thus,spodumene and albite are hard to float without external activated ions in sodium oleate system.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Interaction of magnetic spheres in magnetic fields from the view of magnetic energy density:A 3D finite element analysis(FEA)

    Jiangang KuZhongyun LeiHua LinQuanxiang Yan...
    1341-1350页
    查看更多>>摘要：Magnetic interaction between magnetic particles is of great significance in the fields of magnetic separa-tion and functional materials.A good understanding of interaction mechanism of magnetic particles would further boost its promising industrial applications.We hereby present our work which visualizes the movement behavior of magnetic spheres in magnetic fields employing high-speed imaging and sim-ulates the dynamic behavior of spheres using an Arbitrary Lagrangian-Eulerian(ALE)based on finite ele-ment method.In this paper,we investigated the stress tensor,magnetic force,and dynamic behavior of magnetic spheres in magnetic fields,especially magnetic energy density in different domains.Results show that there are four relatively independent regions of magnetic energy density distribution in exter-nal spatial domains of a single sphere system.Attractive force will generate when the energy density in the spatial region between two spheres is relatively high,while a repulsive force will generate when the energy density in the spatial region between two spheres is relatively low.Every magnetic sphere spon-taneously moves towards the region with high energy density and stays away from the region with low energy density.The total magnetic energy in magnetic spheres'domains(V1)and external spatial domains(V2)increases,but the magnetic energy in the external spatial domain decreases over time dur-ing the aggregation process.The magnetic spheres ultimately arrange in chain-like structures oriented along magnetic field direction.We hereby proposed a novel and efficient approach to predict the move-ment trends and final state of magnetic particle swarm from the view of energy density.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Flotation of copper oxide minerals:A review

    Qicheng FengWenhang YangShuming WenHan Wang...
    1351-1364页
    查看更多>>摘要：Copper oxide minerals are important copper resources,which include malachite,azurite,chrysocolla,cuprite,etc.Flotation is the most widely used method for the enrichment of copper oxide minerals in the mineral processing industry.In this paper,the surface properties of copper oxide minerals and their effects on the mineral flotation behavior are systematically summarized.The flotation methods of copper oxide minerals and the interaction mechanism with reagents are reviewed in detail.Flotation methods include direct flotation(using chelating reagents or a fatty acid as collector),sulfidization flotation(using xanthate as collector),and activation flotation(using chelating reagents,ammonium/amine salts,metal ions,and oxidant for activation).An effective way to realize efficient flotation of copper oxide minerals is to increase active sites on the surface of copper oxide minerals to enhance the interaction of collector with the mineral surface.Besides,various perspectives for further investigation on the efficient recovery of copper oxide minerals are proposed.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Dynamic pore wetting and its effects on porous particle flotation:A review

    Yuqiang MaoWencheng XiaYaoli PengGuangyuan Xie...
    1365-1378页
    查看更多>>摘要：The dynamic pore wetting plays an important role in the flotation of porous particle,such as coal,fly ash,gasification slag,etc.Water phase get into the pores and crevices on the surface and inside of the parti-cles,creating a dense water layer that covers their surface and decreases their floatability.It is important to reduce the adverse impact of dynamic pore wetting on the flotation performance of porous particles.Thus,this review is to highlight the dynamic pore wetting behavior,and its role in the porous particle flotation as well as the proposed regulation methods to weaken the pore wetting.The characterization approaches of the dynamic pore wetting are discussed including the optical method for the capillary and the nuclear magnetic resonance(NMR)method for porous particles.The surface tension and viscosity of liquid significantly affect the pore wetting degree of porous particles during the 60 min wetting pro-cess.Pre-wetting time adjustment,pore compression,pore filling,and hydrophobic modifications are introduced to decrease the wetting percentage of pores in porous particles and further improve their flotation performance.This critical review will provide some guidance for studying the dynamic wetting behavior of pores and enhancing the floatability of porous particles.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Rheological investigations of the improved fine scheelite flotation spiked with agitation medium

    Wei ChenGuofan ZhangYangge Zhu
    1379-1388页
    查看更多>>摘要：The fine scheelite flotation using garnet and glass beads as agitation medium was investigated through slurry rheology and froth property analysis.The apparent viscosity of fine scheelite,calcite and quartz(-20 μm)slurry were measured and the corresponding scheelite flotation behaviours,froth water recov-ery and froth height were studied.It was found that calcite slurry could aggregate into network structures and exhibit much higher apparent viscosity at the vicinity of pH 8.5-9.0 than scheelite and quartz(scheelite,calcite,and quartz slurry at 20.34,38.66,and 14.58 mPa·s,respectively).Agitation medium containing garnet and glass beads could reduce the slurry apparent viscosity by effectively dispersing the calcite network structures in flotation slurry,and improve the fine scheelite flotation selectivity.As the apparent viscosity was reduced,the froth water recovery decreased from 24.33％to 6.37％and initial froth height of the flotation froth decreased from 69.6 to 8.7 mm,and finally results in increase in sep-aration efficiency from 23.10％to 31.96％.The results could be potentially used in flotation of fine miner-als by applying agitation medium to improve the process selectivity.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Effect of roughness on wettability and floatability:Based on wetting film drainage between bubbles and solid surfaces

    Ming LiYaowen XingChunyun ZhuQinshan Liu...
    1389-1396页
    查看更多>>摘要：Wetting film thinning measurement was introduced to clarify the wettability and floatability of solid sur-faces with varying roughness.The wettability was quantified using the contact angle measurement com-bined with the dynamic force microbalance test between solid surfaces and water droplets,while the floatability was investigated by the bubble-solid surface dynamic attachment observation and the induc-tion time measurement.The results show that the water contact angles reduce(14.53°,12.74°,and 6.71°)with the increase of glass surface roughness,while the water droplet-glass adhesion forces intensify(11.1,19.1 and 19.2 μN)owing to the stable wetting film.The distortion of the contact surface and the Wenzel state are the causes.In contrast,the hydrophobized surfaces have the growing apparent contact angles(38.08°,69.81°,and 81.01°),declining adhesion strength and shortening induction time(863,352 and 12 ms)along with the increasing surface roughness.The weak wettability and fine floatability on the rough hydrophobized surface is reflected in the fast wetting film drainage dynamics and three-phase con-tact formation,which may be attributed to the wetting film with short diameter on tiny rough nubs and the entrapped air in the grooves as a bridge between the bulk bubble and the solid surface.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Insight into the microstructural evolution of anthracite during carbonization-graphitization process from the perspective of materialization

    Huihui ZengBaolin XingYijun CaoBing Xu...
    1397-1406页
    查看更多>>摘要：Materialization of coal is one of effective and clean pathways for its utilization.The microstructures of coal-based carbon materials have an important influence on their functional applications.Herein,the microstructural evolution of anthracite in the temperature range of 1000-2800℃was systematically investigated to provide a guidance for the microstructural regulation of coal-based carbon materials.The results indicate that the microstructure of anthracite undergoes an important change during carbonization-graphitization process.As the temperature increases,aromatic layers in anthracite gradu-ally transform into disordered graphite microcrystals and further grow into ordered graphite microcrys-tals,and then ordered graphite microcrystals are laterally linked to form pseudo-graphite phase and eventually transformed into highly ordered graphite-like sheets.In particular,2000-2200℃is a critical temperature region for the qualitative change of ordered graphite crystallites to pseudo-graphite phase,in which the relevant structural parameters including stacking height,crystallite lateral size and graphi-tization degree show a rapid increase.Moreover,both aromaticity and graphitization degree have a linear positive correlation with carbonization-graphitization temperature in a specific temperature range.Besides,after initial carbonization,some defect structures in anthracite such as aliphatic carbon and oxygen-containing functional groups are released in the form of gaseous low-molecular volatiles along with an increased pore structure,and the intermediates derived from minerals could facilitate the con-version of sp3 amorphous carbon to sp2 graphitic carbon.This work provides a valuable reference for the rational design of microstructure of coal-based carbon materials.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Influence of colloidal nanosilica on hydration kinetics and properties of CaO/CaSO4-activated slag binder

    Qing LiuQingming HeRuoyun LiYanfei Feng...
    1407-1418页
    查看更多>>摘要：To solve the energy consumption and CO2 emission during cement production,the new binders must be developed as an alternative to cement.CaO/CaSO4-activated slag binder is an eco-friendly and safe cementitious material;however,its low strength during initial stages limits its applications.In this study,colloidal nanosilica(CNS)was employed as an additive to improve the strength of CaO/CaSO4-activated slag binder,and the effects of CNS on the workability,hydration kinetics,hydration products(type,quan-tity,and polymerization degree),and binder microstructure were thoroughly investigated.A moderate CNS content,through its nucleation effect,significantly increased the hydration rate of the nucleation and crystal growth(NG),phase boundary interaction(I)and diffusion(D)processes,which generated large quantities of calcium aluminosilicate hydrate(C-A-S-H)gel in the initial hydration stage.Meanwhile,the addition of CNS improved the polymerization degree of C-A-S-H gel.This amorphous reactant well-filled the pore space between slag particles and yielded a compact microstructure,conse-quently enhancing the binder strength.Considering the reduction in fluidity and the increase in produc-tion cost,the CNS mass fraction was controlled as～3％,and the binder reached the satisfactory strengths of 3.87,24.47,31.43,and 41.78 MPa at 1,3,7,and 28 d,respectively.
      原文链接:
    • NETL
    • NSTL
    • 万方数据