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  • 1.
    Fan, Y.
    et al.
    Institute of Material Science and Engineering, South China University of Technology, Guangzhou.
    Yanmin, Wang
    Xie, P.
    Institute of Material Science and Engineering, South China University of Technology, Guangzhou.
    Li, X.
    Institute of Material Science and Engineering, South China University of Technology, Guangzhou.
    Pan, Z.
    Institute of Material Science and Engineering, South China University of Technology, Guangzhou.
    Mechanical preparation of nano titanium dioxide powder and its optical properties2007In: Journal of the Chinese Ceramic Society, ISSN 0454-5648, Vol. 35, no 7, p. 832-837Article in journal (Refereed)
    Abstract [en]

    mechanical preparation of the nano-sized particles of TiO2 powder by a stirred bead mill was investigated. The particle sizes of the ground products were determined by the acoustic particle sizer, the nitrogen gas adsorption method and a scanning electron microscopy. The diameter of the nano-sized particles, which were obtained after milling for 7 h, is about 50 nm and the specific surface area is up to 70 m2/g. The surface and structure of the samples have been investigated with X-ray diffraction. It is indicated that an intense comminution in the mill leads to a progressive loss in crystallinity of TiO2. The catalytic degradation of methyl orange in water was also studied by a photometer. The results show that the nano-sized particles of TiO2 powder prepared by milling possess photocatalysis effect and are capable of absorption of ultraviolet radiation

  • 2.
    Forssberg, Eric
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Wang, Yanmin
    Recovery of hematite and chromite fines and ultrafines by wet magnetic methods1994In: Minerals & metallurgical processing, ISSN 0747-9182, Vol. 11, no 2, p. 87-96Article in journal (Refereed)
    Abstract [en]

    Wet magnetic separation methods for the recovery of hematite and chromite fines and ultrafines were investigated. These methods included wet high-intensity and high-gradient magnetic separation, carrier or 'piggy-back' magnetic separation, magnetic field-induced aggregation and magnetic seeding. This investigation indicated that wet magnetic separation is more efficient for fines and ultrafines. This investigation also indicated that other methods can be used to enhance the particle aggregation and/or the magnetic response. The magnetic behavior of these minerals with respect to the magnetizing field, temperature and particle size is also presented.

  • 3.
    Forssberg, Eric
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Wang, Yanmin
    Persson, H.
    Luleå tekniska universitet.
    Trockene Feinstmahlung von Dolomit mit der rührwerkskugelmühle SAM 7.5.: Einfluss von Mahlkörper und Mahlhilfsmittel1995In: Aufbereitungstechnik - Mineral processing, ISSN 0004-783X, Vol. 36, no 5, p. 211-Article in journal (Other academic)
  • 4.
    Forssberg, Eric
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Yanmin, Wang
    International overview and outlook on comminution technology2003Report (Other academic)
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  • 5. He, Mingzhao
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Yanmin, Wang
    Han, Yuexin
    School of Resources and Civil Engineering, Northeastern University.
    Ultrasonication-assisted synthesis of calcium carbonate nanoparticles2005In: Chemical Engineering Communications, ISSN 0098-6445, E-ISSN 1563-5201, Vol. 192, no 11, p. 1468-1481Article in journal (Refereed)
    Abstract [en]

    This article presents a batch carbonation method with ultrasonication to synthesize monodispersed nanoparticles of calcium carbonate (CaCO3). The synthesis processes with and without ultrasonication were compared. The results showed that the application of ultrasonication into the synthesis caused a supersaturation of Ca2+ ions in the synthesis, leading to a rapid nucleation of calcium carbonate and improved the solute transfer as well as. It was also found that the effect of ultrasonication on the grain size of the nanoparticles synthesized was related to other synthesis conditions, such as initial temperature for carbonation, mass fraction of Ca(OH)2 suspension, and CO2 flow rate. The initial temperature applied for the carbonation was increased by at least 5°C when ultrasonication was applied. The nanoparticles formed in the presence of ultrasonication became smaller with a narrower particle size distribution at 6–12 wt.% of Ca(OH)2 suspension or at 1.28 l/h of CO2 consumed by per gram of Ca(OH)2 or more.

  • 6. He, Mingzhao
    et al.
    Wang, Yanmin
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Parameter effects on wet ultrafine grinding of limestone through slurry rheology in a stirred media mill2006In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 161, no 1, p. 10-21Article in journal (Refereed)
    Abstract [en]

    Wet ultra-fine grinding of a limestone powder ( less than or equal 100 μm) has been investigated in a stirred media mill with respect to the effect of slurry rheology. The grinding results obtained by various parameters (i.e., molecular weight of a dispersant, solids concentration, additive dosage, addition method and beads load) are evaluated in terms of energy efficiency and the fineness of a product. A polymeric dispersant called Dispersant S40 with a molecular weight of 5500 gives the best grinding results. For a certain level of beads load, an optimal solids concentration exists. In the case of the additive dosage of Dispersant S40 at 0.1 wt.% or more, a smaller additive amount of Dispersant S40 gives a higher energy efficiency and a smaller median size at a lower level of specific energy input. However, the excessive amount of the dispersant could cause a cushion layer formed on milling beads and thus lowers stress intensities from the collisions of milling beads, leading to an inefficient milling operation. This can be avoided by either the multi-point addition of the dispersant or a higher beads load ( greater than or equal 83 vol.%). In addition, it was found that the higher the beads load, the better the cumulative energy efficiency, and the smaller the product size at the same specific energy consumption. For a given solids concentration, the relationships between the specific surface area and the particle size of an FP product and the additive amount of Dispersant S40 are explored, respectively. Furthermore, an empirical particle size-energy model provides a good fit (R2 > 0.991) to the grinding results under the experimental conditions investigated.

  • 7. He, Mingzhao
    et al.
    Wang, Yanmin
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Parameter studies on the rheology of limestone slurries2006In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 78, no 2, p. 63-77Article in journal (Refereed)
    Abstract [en]

    The influences of solids concentration, molecular weight of dispersant, particle size and distribution, and temperature on the rheological behaviour of limestone slurries have been investigated. The results reveal that when the solids concentration of a limestone slurry (< 100 μm) is increased from 60 wt.% (35.71 vol.%) to 78.5 wt.% (57.49 vol.%), the rheological behaviour of the slurry is transformed from a weakly dilatant characteristic to a pseudoplastic one with a yield stress, which is in combination with a thixotropic property at a higher solids concentration (i.e., ≥ 75 wt.% or 52.63 vol.%). At a certain shear rate, the apparent viscosity and the relative viscosity of the slurry increase exponentially with solids concentration. The extrapolated Bingham yield stress increases rather sharply in a power-law form with increasing solids concentration when the solids concentration of the slurry is larger than 70 wt.% (i.e., 46.36 vol.%)...

  • 8. He, Mingzhao
    et al.
    Yanmin, Wang
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Slurry rheology in wet ultrafine grinding of industrial minerals2004In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 147, no 1-3, p. 94-112Article in journal (Refereed)
    Abstract [en]

    Wet ultrafine grinding has been increasingly used for production of ultrafine powders in various industries. It has been known that slurry rheology significantly influences the grindability of industrial minerals in wet ultrafine grinding. This review represents some previous work with respect to slurry rheology in ultrafine grinding. In this review, some methods for the characterization of the slurry rheology and some empirical equations modelling rheological behaviours of slurries were presented. The semiempirical model incorporating slurry rheology, solids concentration, particle size and slurry temperature was described. In addition, on-line measurement for the slurry rheology control was also discussed. In the case of ultrafine grinding, various parameters (such as solid concentration, particle size and distribution, particle shape, temperature, rotation and pH, use of dispersants), which affect the slurry rheology, have been described. It was revealed that the optimization of the rheological behaviours of slurry in ultrafine grinding could increase throughput, energy efficiency and product fineness as well. It is suggested to further study the mechanisms of slurry rheology in the presence of chemical dispersants in wet ultrafine grinding. It is desired to develop a model, which can represent a relation among slurry rheology, comminution parameters, amount of dispersant, energy efficiency and particle size characterization.

  • 9.
    Liang, G-B
    et al.
    College of Material Science and Engineering, South China University of Technology, Guangzhou.
    Yanmin, Wang
    Li, X-H
    College of Material Science and Engineering, South China University of Technology, Guangzhou.
    Wang, Y-Q
    Dandong Bettersize Instruments, Ltd.
    Modified regularization method applied to the inversion of particle size distribution from light scattering data2006In: Guangdian Gongcheng, ISSN 1003-501X, Vol. 33, no 12, p. 44-49Article in journal (Refereed)
    Abstract [en]

    Laser particle size analyzer is one of the instruments for particle size analysis. Recent developments focus on various algorithms for particle size analysis via light energy distribution based on the Mie scattering theory in the laser analyzer. The determination of the particle size distribution (PSD) from the analyzer requires the inversion of the Fredholm integral equation of the first kind. This equation is an ill-posed one, which can be analyzed by effective algorithms. This paper presents a modified regularization method applied to the inversion of the PSD with the independent models. The Generalized Cross-Validation (GCV) method was used for the selection of a regularization parameter. The Successive Over-Relaxation (SOR) iterative method was applied to improve the exactness and stability of the convergent result. The simulation with the models was carried out. The simulated results are in a good agreement with the data measured from nine standard particulate samples as well as their mixtures. It is indicated that this method can be feasible and effective for the simulation of the PSD from the corresponding light scattering data.

  • 10.
    Ouchterlony, Finn
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Olsson, Mats
    Kou, S.
    Evertsson, M.
    Yanmin, Wang
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    A survey of rock fragmentation research in Sweden and the world2004Report (Other academic)
  • 11.
    Pan, Zhidong
    et al.
    College of Material Science and Engineering, South China University of Technology.
    Yanmin, Wang
    Li, Xinheng
    College of Material Science and Engineering, South China University of Technology.
    Mechanically activated slag cement2005In: Journal of the Chinese Ceramic Society, ISSN 0454-5648, Vol. 33, no 10, p. 1248-1254Article in journal (Refereed)
    Abstract [en]

    Mechanical activation of cement blended with metallurgical wastes (blast furnace slag and silica fume) in a high energy vibrating mill was investigated. The results show that the mechanical activation of the solids led to a reduction of the ground product fineness and an effective dispersion/interaction of ultra-fine silica particles within cement particles, resulting in an increased rate of the hydration reactions of the slag cement. The hardened paste samples after activation possess higher bending and compressive strengths. Fourier transform infrared spectroscopy and nuclear magnetic resonance studies indicate the mechanism of the mechanical activation on the slag cement.

  • 12. Pugh, R.J.
    et al.
    Wang, Yanmin
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Influence of magnetic and surface forces on the coagulation of hematite and chromite1994In: Minerals & metallurgical processing, ISSN 0747-9182, Vol. 11, no 3, p. 133-140Article in journal (Refereed)
    Abstract [en]

    The coagulation of dispersed ultrafine weakly magnetic oxide mineral particles (e.g., natural hematite and chromite) in an external magnetic field can be described by interparticle forces. Essentially, coagulation occurs when the short-range London-van der Waals interactions and the long-range magnetic forces outweigh the stabilizing electrical double-layer repulsion. Using the classical colloid chemistry theory, the various components of the potential energy for different-sized particles at a series of ionic strengths and magnetic field intensities were calculated.

  • 13. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Aggregation between magnetite and hematite ultrafines utilizing remanent magnetization1992In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 5, no 8, p. 895-905Article in journal (Refereed)
    Abstract [en]

    It is indicated that hematite ultrafines (<10 μm) in a well-dispersed surry are selectively aggregated with magnetite ultrafines in the absence of aggregating agents, high shear rates or an external magnetic field. The formation of the aggregates is attributed to the presence of their remanent magnetizations, mainly to that of magnetite. The mechanism of an aggregation of this type is discussed.

  • 14. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Dry comminution and liberation with microwave assistance2005In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 34, no 1, p. 57-63Article in journal (Refereed)
    Abstract [en]

    This paper presents the experimental results obtained from microwave-assisted comminution/liberation tests on various minerals. The effects of microwave energy intensity and exposure time on microwave heating behaviour and grind-ability of materials are discussed. The experimental results indicated that particle size has a significant effect. The coarser particles (−9.50 + 4.75 mm) of some minerals (limestone and quartz) were affected by microwave heating to varying degrees, resulting in an increased fineness of the ground product in a subsequent dry ball milling. It was observed that the silicate and carbonate minerals are difficult to heat at lower microwave energy intensities (

  • 15. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Particle size dependence on the performance of HGMS for treatment of chromite slimes1992In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 21, no 3, p. 121-126Article in journal (Refereed)
    Abstract [en]

    An experimental study of particle size dependence on the performance of a high gradient magnetic separator for the treatment of the fine fractions of chromite ores is described. A high quality concentrate can be obtained with high recovery of chromite particles above 10 μm. Particles below 10 μm cannot be recovered efficiently. The determination of the lower size limit of the recoverable particle by experiment and by theoretical models is also discussed.

  • 16. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Production of carbonate and silica nano-particles in stirred bead milling2006In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 81, no 1, p. 1-14Article in journal (Refereed)
    Abstract [en]

    This paper presents the experimental results of the mechanical production of silica and carbonate colloidal particles below 100 nm using two types of stirred bead mills (i.e., DCP Superflow 12 and PML H/V). It is shown that the stirred bead mill with very small beads can be used as an efficient equipment for the production of the colloidal particles in nanoscale from the feed materials of several microns in sizes at high energy consumptions. The DCP Superflow mill with high power densities is superior for the effective size reduction and production rate, compared to the conventional PML H/V mill with lower power densities. The smaller particles could be produced by the DCP Superflow mill at the same level of high energy inputs as from the PML H/V mill. The "grinding limit" for the processes in the mills has been discussed. The nanoparticle sizes of the ground products obtained in the mills were determined by a scanning mobility particle sizer (SMPS), an acoustic particle sizer (APS-100), a nitrogen gas adsorption method (BET), and transmission electron microscopy (TEM). The surface mean particle diameters on the same sample obtained with the different methods for the nanoparticle size analysis are varying due to the different characterisation techniques. The TEM micrographs show a large amount of the primary nanoparticles below 100 nm produced after milling. In addition, the surface and structure of the original and the ground colloidal products have been investigated with some particle/surface characterisation techniques such as X-ray diffraction (XRD), nuclear magnetic resonance (29Si NMR) and Fourier transform infrared spectroscopy (FTIR). It is indicated that an intense comminution of carbonate minerals in the stirred bead mills leads to a progressive loss in crystallinity of the basal planes of the crystal structure. An intensive mechanical treatment of silica gives the structural changes and the amorphisation.

  • 17. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Recent activities in magnetic separation in Sweden1995In: Magnetic and Electrical Separation, ISSN 1055-6915, E-ISSN 1029-0303, Vol. 7, no 1, p. 1-18Article in journal (Refereed)
    Abstract [en]

    This paper describes some industrial applications of magnetic separation in Swedish mineral industry. Recent studies on magnetic treatment of minerals in Sweden are also presented. These studies involve selectivity of wet magnetic separation, wet magnetic recovery of mineral fines and ultrafines, sulphide processing by magnetic means, as well as dry magnetic purification of industrial minerals.

  • 18. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Klymowsky, R.
    Feinzerkleinerung von Kalkstein in Gutbettwalzenmühlen und Rührwerkskugelmühlen1998In: Aufbereitungstechnik - Mineral processing, ISSN 0004-783X, Vol. 39, no 6, p. 267-278Article in journal (Refereed)
    Abstract [en]

    In this paper, the High Pressure Roller Mill has been used as a pre-crusher or pre-grinder for the treatment of a filter cake limestone material. The different comminution systems with or without the High Pressure Roller Mill have been investigated. Experimental results indicated that pretreatment of the material favors the subsequent wet ultrafine grinding for energy efficiency and throughput. The fineness of the ground product is significantly influenced by various pass numbers of pre-grinding with the High Pressure Roller Mill. The formation of the micro-cracks in the particles under the compressive loads was also discussed in order to elucidate the role of the High Pressure Roller Mill as a pre-grinder before the attrition mill.

  • 19. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Peng, Lin
    Department of Hydraulic Engineering, Tsinghua University, Beijing.
    Hybrid comminution with high-pressure roller and stirred bead milling2006In: Particle & particle systems characterization, ISSN 0934-0866, E-ISSN 1521-4117, Vol. 22, no 5, p. 336-344Article in journal (Refereed)
    Abstract [en]

    This paper presents the experimental results on the wet grinding of a moist calcium carbonate material in a hybrid comminution system, which consists of a high pressure roller mill (HPRM) and a subsequent stirred bead mill. The results show that the pre-treatment of the material with the HPRM could result in energy saving and efficient size reduction during the subsequent wet ultra-fine grinding in the stirred bead mill. It was found that the level of fineness of the ground product is dramatically influenced by the number of repeat passes of pre-grinding in the HRPM. The formation of micro-cracks in the particles under compressive loads was discussed in order to elucidate the role of the HRPM as a pre-grinder in the hybrid comminution system. The simulated breakage behaviors of various irregular shaped particles indicate that the tortuous micro-crack propagation paths and the crack branching behavior are related to the heterogeneity of the particle and the stress distributions.

  • 20. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Pugh, R.J.
    Influence of pH on the high gradient magnetic separation of1992In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 36, no 1, p. 93-105Article in journal (Refereed)
    Abstract [en]

    This paper presents the influence of surface interaction on wet high gradient magnetic separation (WHGMS) for hematite and quartz particles (<10 μm), by controlling the pH value of the slurry flow. This influence is discussed by computing the net interaction energies for the particle-particle and particle-matrix element systems at various pH values. Such an approach leads to an improvement in the efficiency of separating the mineral ultrafines by WHGMS.

  • 21. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Pugh, Robert
    Hydrophobic magnetite seeding of hematite ultrafines in high gradient magnetic separation1993In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 6, no 5, p. 537-546Article in journal (Refereed)
    Abstract [en]

    The application of hydrophobic magnetite seeding to concentrate hematite ultrafines (< 10 μm) in slimes using a high gradient magnetic separator (HGMS) with coarse expanded metal matrices was investigated. It was shown that the selective aggregation at high shear rate of the seeded hematite particles (produced by surface treatment with sodium oleate and colloidal magnetite) could significantly enhance the HGMS capture of hematite ultrafines. The mechanism of selective aggregation was discussed in terms of the combination of hydrophobic and magnetic interactions.

  • 22. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Pugh, Robert
    Elming, Sten-åke
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Magnetic aggregation in dispersions of mineral ultrafines1995In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 16, no 2, p. 137-154Article in journal (Refereed)
    Abstract [en]

    Particle aggregation can be enhanced in two ways; (a) field-induced magnetic moment and (b) magnetic moment due to the remanent magnetisation. Investigation of the magnetic field-induced aggregation of hematite and chromite in aqueous suspension with the use of a laboratory scale electromagnetic solenoid related the aggregation process to particle size and external magnetic field in the natural pH value of the dispersions. This study have shown that hematite ultrafines in a well-dispersed slurry are selectively aggregated with sized magnetite in the absence of aggregating reagents, high shear rates or an external magnetic field.

  • 23. Wang, Yanmin
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Sachweh, Jens
    Maschinenfabrik Gustav Eirich, Eirich Machines Inc..
    Dry fine comminution in a stirred media mill - MaxxMill®2004In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 74, no Suppl. Comminution 2002, p. S65-S74Article in journal (Refereed)
    Abstract [en]

    A large-scale continuous stirred media mill called the MaxxMill [registered trademark] system in dry mode was used to investigate the comminution characteristics. A limestone powder below 2 mm was used as a feed material. A statistical experimental design was prepared with the major influencing parameters of the MaxxMill [registered trademark] , such as rotational speed of stirrer, feed rate and bead size. The fineness of the ground products obtained under various conditions of the MaxxMill [registered trademark] and the corresponding energy utilisation have been evaluated and analysed. The results have been empirically correlated with the operating parameters. In addition, product size-energy input relations can be described empirically, independent of the parameters used.

  • 24. Wang, Yanmin
    et al.
    Johansson, Ann-Cathrine
    Luleå tekniska universitet.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Chan, Billy
    ML Systems.
    Purification of fine powders by a superconducting HGMS with vibration assistance2000In: Magnetic and Electrical Separation, ISSN 1055-6915, E-ISSN 1029-0303, Vol. 10, no 3, p. 161-178Article in journal (Refereed)
    Abstract [en]

    In this study, a superconducting high gradient magnetic separator (HGMS) with a matrix vibration system in dry mode was utilized to purify fine calcite and quartz powders smaller than 38 μm. The effects of the operating parameters (particle size, magnetic field/average air velocity (B0/V0), the amplitude of vibration as well as the aperture size of the expanded metal matrix) have been presented. The mechanically-based matrix vibration with the air blowing was recognized to be effective for dry purification of fine powdered materials at high magnetic fields. The function of the matrix vibration has been discussed. In addition, the results have been empirically correlated with the operating parameters used for the purification in the separator.

  • 25. Wang, Yanmin
    et al.
    Li, Jingxian
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Computer simulation for particle packing phenomena2003In: Journal of the Chinese Ceramic Society, ISSN 0454-5648, Vol. 31, no 2, p. 169-178Article in journal (Refereed)
    Abstract [en]

    Computer simulation of particle packing in various material engineering areas (mainly in ceramics, cement, pharmaceuticals, powder metallurgy, polymer, etc.) provides very useful engineering tools in order to economically and efficiently analyse/optimise the properties of material and design the advanced materials as well. Recent major developments is represented on this aspect for the past 15 years. Computer simulation of particle packing processes has been advanced, especially for the packing dynamics. Some developed computer softwares have been applied to simulate the particle packing processes of various materials like ceramics and concrete. A new concept for simulation of packing phenomena based on the discrete element method (DEM) has been recently proposed. Also, in order to simplify the simulation process, a new type of Monte Carlo one-dimensional algorithm has been developed instead of the complex three-dimensional strategy in the existing computer systems. In addition, the limitations/problems of developed simulation algorithms and the possible future developments are discussed

  • 26. Wang, Yanmin
    et al.
    Pan, Zhidong
    College of Material Science and Engineering, South China University of Technology.
    Xie, Pingbo
    Institute of Material Science and Engineering, South China University of Technology, Guangzhou.
    Li, Xinheng
    College of Material Science and Engineering, South China University of Technology.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Centrifugal classification of ultrafine calcium carbonate2006In: Journal of the Chinese Ceramic Society, ISSN 0454-5648, Vol. 34, no 8, p. 927-931Article in journal (Refereed)
    Abstract [en]

    The experimental results on wet classification of ultra-fine calcium carbonate below 8 μm using an industrial scale disc-stack nozzle centrifuge system are presented. The parameters such as G-force, disc geometry, nozzle size, split, feed rate have been analysed by a statistical approach. The results show that the centrifuge is capable to efficiently classify the micron-sized material at 40% in mass. The product size distribution becomes finer and steeper after removing the undesired coarser particles from the feed. In addition, the centrifugal classification performance is empirically correlated to the parameters used.

  • 27. Wang, Yanmin
    et al.
    Pugh, R.J.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Carrier coagulation of chromite fines in wet magnetic separation1993In: Magnetic and Electrical Separation, ISSN 1055-6915, E-ISSN 1029-0303, Vol. 5, no 1, p. 33-52Article in journal (Refereed)
    Abstract [en]

    A 'carrier' or 'piggy-back' coagulation process was applied to improve the separation efficiency of chromite slimes in wet high-gradient magnetic separation. This was achieved by the addition of a coarse chromite fraction to the slime fraction (< 10 mm). Three coarse chromite fractions were investigated in the present study with size ranges <106>75, <75>53 and <53>38 μm. The results suggested that the <53>38 μm coarse fraction was the most effective in improving the process efficiency. Superior performance was also found to occur between pH 5 and 6. The results were discussed by computing the various components for potential energy of interaction between the slime particles and the 'carrier' or 'piggy-back' particles at a range of surface potentials in the absence or presence of the magnetic field.

  • 28. Wang, Yanmin
    et al.
    Pugh, R.J.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Influence of interparticle surface forces on the coagulation of weakly magnetic mineral ultrafines in a magnetic field1994In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 90, no 2, p. 117-133Article in journal (Refereed)
    Abstract [en]

    The paper demonstrates that the coagulation of dispersions of weakly magnetic mineral ultrafines in an external magnetic field can be described theoretically by invoking interparticle forces. This was done with the use of experimental results that relate the coagulation process to particle size, slurry pH and the external magnetic field. Coagulation were seen to occur either on the primary minimum or secondary minimum depending on the exerted magnetic force.

  • 29. Yanmin, Wang
    Developments on optimisation of grinding in Australia: a survey study2004Report (Other academic)
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  • 30. Yanmin, Wang
    Magnetic concentration of hematite and chromite fines and ultrafines1991Licentiate thesis, comprehensive summary (Other academic)
  • 31. Yanmin, Wang
    Some practical problems on application of high gradient magnetic separation [Chinese]1993In: Kuangye Gongcheng, ISSN 0253-6099, Vol. 13, no 1, p. 21-23, 62Article in journal (Refereed)
    Abstract [en]

    Theories and tests of high gradient magnetic separation are mostly suitable only for watery slurry with constant components. However, it is difficult for them to describe the real situation of magnetic separation of complex minerals. Some practical problems such as magnetic force, matrix matching, selectivity, lower size limit, magnetic separator, and matrix binding are discussed. High gradient magnetic separation can be used in recovery and separation of hematite, ilmenite, and Cr--Fe and Pb--Zn ores.

  • 32. Yanmin, Wang
    Wet magnetic concentration for weakly magnetic mineral fines and ultrafines1993Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The first objective of the thesis was to reveal the characteristic magnetic behaviour of natural weakly magnetic minerals (such as hematite and chromite), and the size limits of the particles recoverable by the existing modem high intensity and high gradient magnetic separators. The second objective was to enhance the particle aggregation andlor the magnetic response for wet magnetic concentration of the ultrafines which escaped from the separators. It was observed that weakly magnetic natural minerals (hematite and chromite) exhibited variations in the magnetic behaviour with respect to magnetizing field, temperature and even particle size, It was indicated that high gradient magnetic separation with industrial matrices was efficient for weakly magnetic minerals as small as 10 um, but below this size, poor separation efficiency was obtained. In this thesis, modifications to the existing magnetic technology or alternative methods were investigated for the efficient recovery of particles below 10 gm. The technology or methods included "carrier" or "piggy-back" method, aggregation with magnetic bonding (with permanent or fieldinduced magnetic moment), and hydrophobic magnetite seeding. The thesis discusses the theoretical aspects of the problem and the experimental work. It was clearly demonstrated that wet magnetic concentration was more efficient for the ultrafine fractions whereas other methods could be used to increase the effective particle size dimensions andlor the magnetic susceptibilities.

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  • 33. Yanmin, Wang
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Enhancement of energy efficiency for mechanical production of fine and ultra-fine particles in comminution2007In: China Particuology, ISSN 1672-2515, Vol. 5, no 3, p. 193-201Article in journal (Other academic)
    Abstract [en]

    This paper presents the energy requirements for mechanical production of fine and ultra-fine particles in comminution. Recent approaches for effective size reduction and energy saving in comminution are described, viz., (a) development and application of new mills/classifiers, (b) adjustment of the bead characterization in stirred bead mills, (c) hybrid comminution systems with roller-press and media mill, (d) assisted methods, and (e) simulation.

  • 34. Yanmin, Wang
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Product size distribution in stirred media mills: Technical note2000In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 13, no 4, p. 459-465Article in journal (Refereed)
    Abstract [en]

    A study on the control of particle size distribution (PSD) of the ground carbonate product in stirred media mills (wet Drais stirred bead mill and dry Sala Agitated Mill) is presented in this paper. The results indicated that the slope of product size distribution can be controlled by altering some operating parameters, such as size of grinding media and tip or peripheral speed. The profile of product size distribution from the stirred media mills was found to follow most closely the Rosin-Rammler-Bennett (RRB) model.

  • 35. Yanmin, Wang
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Axelsson, H.
    Wet centrifugal classification of calcite fines: Effect of feed size2001In: Advanced Powder Technology, ISSN 0921-8831, E-ISSN 1568-5527, Vol. 12, no 3, p. 393-412Article in journal (Refereed)
    Abstract [en]

    The wet classification of various fine calcite materials ( less than or equal 8, less than or equal 12 and less than or equal 45 μm) by a disk-stack nozzle centrifuge is presented and the results are discussed with respect to feed size. It has been found that the influences of disk-geometry, G-force and feed rate on the classification performance are not related to feed size. However, the selection of a split suitable for an efficient separation depends on the particle size distribution of the feed material. Feed size has an impact on the residence time of particle separation. The results showed that an optimum efficiency can be achieved when a calcite material with a particle size below 12 μm is treated. An excessive amount of fine or coarse calcite particles in the feed affects the efficiency of the classification in the centrifuge. It is also indicated that an effective classification of calcite fines requires a moderate G-force and high flow rates through a disk section bound by stud spacers in the centrifuge.

  • 36. Yanmin, Wang
    et al.
    Forssberg, Eric
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Sunnebo, Lars
    Nordkalk AB.
    Sköld, Anneli
    Nordkalk AB.
    Prediction of performance of a commercial scale high pressure roler mill (Poittemill) in production of limestone powders2005Report (Other academic)
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    FULLTEXT01
  • 37. Yanmin, Wang
    et al.
    Pan, Z.
    Institute of Material Science and Engineering, South China University of Technology, Guangzhou.
    Mechano-chemical effects on synthesis of ceramic materials and its compositions2005In: Journal of the Chinese Ceramic Society, ISSN 0454-5648, Vol. 33, no 4, p. 506-515Article in journal (Refereed)
    Abstract [en]

    This paper reviews recent developments on mechano-chemical synthesis of various ceramic materials and compositions (such as oxide ceramics, biomaterial ceramics, electronic and electric intermetallics, microwave dielectric composite, battery compounds, and sialon ceramic composites). The method of soft mechano-chemical synthesis has a considerable potential for low cost, large scale production of various ceramic materials. The technique can be extended to the synthesis of a very wide range of various powders of advanced inorganic materials by the suitable selection of starting materials and milling conditions. The method accelerates and simplifies the process of the synthesis, decreases the energy expenses and the cost of the materials, thus being more economically efficient and ecologically clean. The mechano-chemical procedure permits an unique preparative flexibility allowing for rapid solid-phase crystallisation of nano-structured ceramic materials. Further studies in this aspect are also proposed

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