Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 52, Issue 10
Displaying 1-4 of 4 articles from this issue
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Original Paper
  • Identification of Flow Properties of Fine Powders Based on Dynamic Flow Characteristics Obtained by Stirring and Aerating
    Hiroshi Nagashima, Toshifumi Ishikura
    2015 Volume 52 Issue 10 Pages 576-584
    Published: October 10, 2015
    Released on J-STAGE: October 29, 2015
    DOIhttps://doi.org/10.4164/sptj.52.576
    JOURNAL FREE ACCESS
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    In this study, flow properties of fine powders were characterized using the FT4 Powder Rheometer which can measure the dynamic flow characteristics and the bulk properties of powders. In the dynamic test, the twisted blade descends through the powder bed while rotating, and the total energy required to move the blade through the sample is obtained. The influences of blade speed, consolidation and aeration on the total energy were examined. In the bulk test, the compressibility was measured as volume reduction by applying a given normal stress to the sample powder.
    The results showed that the total energy was due to the resistance of the powder bed to flow and indicated flowability of powders. Change in the total energy according to blade speed, consolidation and aeration showed compaction and adhesive-agglomerative properties of powders. The compaction properties in the dynamic test corresponded to the compressibility in the bulk test.
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Review
  • Simulation for Powder Processing in Iron Making Processes
    Junya Kano, Shingo Ishihara
    2015 Volume 52 Issue 10 Pages 585-594
    Published: October 10, 2015
    Released on J-STAGE: October 29, 2015
    DOIhttps://doi.org/10.4164/sptj.52.585
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    The iron making process by blast furnace method is composed of several powder processing such as powder mixing of calcium carbonate, coke and iron ores, granulation of iron ores, charging granules into sintering process, sintering, crushing and charging to blast furnace. Numerical simulation by Distinct Element Method （DEM） has been applied to granule behavior of iron ore and to charging of granules into sintering process in order to control the powder processing precisely. The new simulation method, which is named Advanced DEM is developed for particle breakage behavior in powder processing. In this article, simulations for granular behavior in the drum mixer, charging behavior of granules to sintering process and particle breakage behavior are introduced.
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Review: Practical Environmental Technology Series
  • Preparation of Composite Vivid Color Particles without Heavy Metal by Organic Yellow Pigment Coating
    Kazuyuki Hayashi
    2015 Volume 52 Issue 10 Pages 595-599
    Published: October 10, 2015
    Released on J-STAGE: October 29, 2015
    DOIhttps://doi.org/10.4164/sptj.52.595
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    Yellow pigments with safe characters, higher chroma with vivid yellowish color, higher tinting strength, and better durability are required especially in color application. We have prepared yellow composite particles consist of titanium dioxide particles coated with organic yellow, assisted by silane compounds as an adhesive agent. TEM photographs of yellow composite particles indicated that organic yellow clusters were adhered onto the titanium dioxide surface, and formed the shell with uneven shape. The performances such as chroma, tinting strength and durability of the yellow composite particles with PY110 were improved to the same or above level of conventional inorganic heavy metal particles.
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Review: Frontier Research Series
  • Particle Design and Mechanical Synthesis of Cathode Materials for Lithium-Ion Batteries
    Takahiro Kozawa
    2015 Volume 52 Issue 10 Pages 600-605
    Published: October 10, 2015
    Released on J-STAGE: October 29, 2015
    DOIhttps://doi.org/10.4164/sptj.52.600
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    Cathode materials for lithium-ion batteries are usually prepared by a high-temperature solid-state reaction and various solution methods such as co-precipitation, sol-gel, and hydrothermal reactions. However, the microstructural control of cathode particles for improving its electrochemical performance requires multi-step processes in these preparation methods. In this paper, we present the mechanical method using an attrition-type mill to produce cathode particles. This method can directly synthesize the typical cathode active materials without external heating and atmosphere control. Moreover, the suitable microstructure as a cathode particle of each active material is obtained by one-step mechanical process. We have demonstrated the one-step mechanical synthesis of the LiCoO2 granule consisting of nanoparticles and the composite granule of LiFePO4/C with porous structure. The spinel-type cathode particle with full concentration gradient was also prepared by using the mechanically preparedcore@shell particle as a precursor. The mechanical method may provide new opportunities for low-cost production of functional materials as well as cathode materials for lithium-ion batteries.
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