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 24, Issue 10
Displaying 1-6 of 6 articles from this issue
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  • Measurement of Size and Shape Index of Unfractured Particle after Impact Crushing
    Yoshiteru KANDA, Takashi YAMASHITA, Hisato SASAKI, Shinobu NIIYAMA
    1987 Volume 24 Issue 10 Pages 635-639
    Published: October 10, 1987
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.24.635
    JOURNAL FREE ACCESS
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    In order to study the relationship between grindability and particle shape, eight kinds of particle sizes and the seven kinds of shape indices of feed particles and unfractured particles were measured after impact crushing. The samples used were quartz and limestone. The size of particles ranged from 4 to 6 meshes.
    As a result, the shape indices defined by (N/T), (L/T) and (F/T) are useful to characterize the grindability of particles.
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  • Some Research on the Removal of Unburned Carbon from Fly Ash
    Eiichi ABE, Hideharu HIROSUE, Noriyuki YAMADA
    1987 Volume 24 Issue 10 Pages 640-646
    Published: October 10, 1987
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.24.640
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    Fly ash from coal-fired electric power plants contains much unburned carbon recently. This causes problems in its utilization as a raw material for fly ash cement and as a cement admixture because of the need to lower the combustion temperature to reduce air pollution.
    This study on the basic properties of fly ash suggests that it is possible to remove unburned carbon from fly ash on the basis of both the variation in carbon content with particle size and the difference in shape between unburned carbon particles and ash.
    Classifying raw fly ash at a certain cut size by means of a sifter without the fracture of particles of a larger size rich in unburned carbon, the fly ash with low unburned carbon content was undersized. Subsequently, by processing most of the oversize fly ash on an inclined vibrating plate, the relatively round fly ash having a low unburned carbon content was separated from unburned carbon particles having an irregular shape.
    Thus, it is concluded that fly ash with low unburned carbon content can be recovered using both of the above-mentioned methods.
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  • The Continuous Measurement of the Flow and Mixing Characteristics of Solid Particles in a Mixer Using an Optical Method
    Munetake SATOH, Yuichiro DEGUCHI, Kei MIYANAMI
    1987 Volume 24 Issue 10 Pages 647-654
    Published: 1987
    Released on J-STAGE: February 22, 2013
    DOIhttps://doi.org/10.4164/sptj.24.10_647
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    A fundamental study of solid mixing was carried out using a newly developed measuring system which employs an optical method. The reflective properties of light for the particle bed and the magnitude of output fluctuation have been measured under static and vibrating conditions to evaluate their degree of mixing in a state of motion. The influence of a number of probes inserted into the particle bed on the mixing index was also examined.
    The concentration change with time measured at the six local positions in a high speed agitator-type mixer and the mixing curves based on these concentration variations showed different patterns according to the operating conditions and the combination of the physical properties of the particles.
    Eight typical cases of mixing were introduced, and the mechanisms of mixing and/or demixing, segregation, phenomena, the coating process and the electrostatics effect on the mixing were discussed.
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  • The Effects of the particle Properties on the Parameters of Impact Sound between Two Particles
    Jusuke HIDAKA, Atsuko SHIMOSAKA, Shigeo MIWA
    1987 Volume 24 Issue 10 Pages 655-663
    Published: October 10, 1987
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.24.655
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    The parameters of impact sound between two particles are discussed to measure the particle size and velocity of colliding particles by the analysis of that impact sound. The radiation mechanism of the impact sound is considered theoretically, and the pressure waveform of the sound is estimated on the basis of the radiation mechanism. The calculation of pressure waveform takes account of the reflection of the impact sound from the surface of the colliding spherical particle. The estimated waveform agrees well with the measured one.
    The parameters of impact sound related closely to the particle size and impact velocity between two particles.
    These results show that it is possible to measure the particle size and velocity of flowing particles by the analysis of flow noise.
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  • [title in Japanese]
    Hiroyuki TASHIRO
    1987 Volume 24 Issue 10 Pages 670-672
    Published: October 10, 1987
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.24.670
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  • [title in Japanese]
    Minoru SUGITA
    1987 Volume 24 Issue 10 Pages 673-674
    Published: October 10, 1987
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.24.673
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