Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
Search
Advanced search
OR
Browse
Search
Volume 32, Issue 8
Displaying 1-10 of 10 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Scale-up Performance of Dry Classification Cyclones
    Evaluation by Different Particle Size Measurement Instruments
    Tadashi FUYUKI, Yoshiyuki YAMADA, Hideto YOSHIDA, Koichi IINOYA
    1995 Volume 32 Issue 8 Pages 526-532
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.526
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The cyclone performance of separation efficiency has been experimentally studied by using three similar but different cyclone diameters, ∅72, ∅154 and ∅343, with mainly fine calcium carbonate powder(JIS, No. 17) and two types of particle size measurement instruments.
    The pressure loss does not change for similar scale up cyclones, and the collection efficiency declines for larger size cyclones. The classification sharpness of partial separation efficiency also appears to deteriorate for larger cyclones than those with a diameter of about ∅200 to 300.
    Both the instrument types to measure the particle size and the test powder samples have a large effect on the partial separation efficiency values. Therefore the evaluation should be executed by the use of both the same instrument and the same powder sample.
    View full abstract
    Download PDF (663K)
  • The Effects of Agitation on the Properties of a Highly Loaded Coal Water Mixture
    Shoichi TAKAO, Hironori OZAKI
    1995 Volume 32 Issue 8 Pages 533-537
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.533
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The changes in CWM properties due to high speed agitation were investigated through batch agitation tests using a laboratory-scale agitator. It was found that it is possible to decrease the apparent viscosity of CWM and improve the statical stability by agitation. The decrease in apparent viscosity was mainly caused by intensive dispersion of surfactant. The improvement of statical stability was mainly attributable to the increase in structural viscosity caused by clay minerals liberated from the coal surface during agitation.
    View full abstract
    Download PDF (1580K)
  • The Permeabiltiy of a Magnetic Particle Bed Suspended Magnetically
    Akihiro TOUDA, Takuya KAWANISHI, Yoshishige HAYASHI, Nobuaki SHIMIZU
    1995 Volume 32 Issue 8 Pages 538-543
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.538
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    When a reactor or a separation system with packed bed is designed, the estimation of pressure drop is of great concern. In the present work, the pressure drop in the bed in which fine Fe3O4 particles are suspended by magnetic force was studied. The experimental results showed that the magnetically suspended particle bed had a lower pressure drop than that predicted by Ergun's equation and it decreased with the increase in the strength of magnetic the field since the inhomogeneity of voids in the particle bed was enhanced with magnetic flux. The permeabilities in the bed were compared with those predicted by the model in which the inhomogeneous condition of the voids was considered. The results suggested that magnetic force is effective not only for suspending Fe3O4 particles but also for lowering the pressure drop in the bed.
    View full abstract
    Download PDF (728K)
  • Compaction Behavior of Powder at Low Normal Stress
    Mitsuaki HIROTA, Hideki FUJIMURA, Kazuya SUZUOKI, Michitaka SUZUKI, To ...
    1995 Volume 32 Issue 8 Pages 544-549
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.544
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The compaction characteristics of powder in the range of low normal stress under several hundreds Pascal are discussed. The compaction characteristics are compared with the shear properties of the powder. The compaction process consists of two processes even though the normal stress is limited in the low stress region.
    The compaction properties in the first process are affected by the cohesion of the sample powder, and the properties in the second process are affected by the mechanical properties of the powder, such as cohesion and the internal friction coefficient. However the compaction properties cannot be estimated by the mechanical properties obtained by shear tests because of the difference in the void fraction during these tests. The compaction test is very suitable to measure the characteristics of a powder with a high void fraction, such as an aerated powder.
    View full abstract
    Download PDF (693K)
  • A Method for Predicting the Filtration Characteristics of Body Filtration
    Eiichi ABE, Hideharu HIROSUE, Noriyuki YAMADA
    1995 Volume 32 Issue 8 Pages 550-556
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.550
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A method to predict the filtration characteristics of body filtration was investigated. The compression permeability data (c. p. data) of a mixed slurry of filter aid and solid impurity was first calculated from a modified Tokumitsu's equation and from an analytical equation for estimating the local specific filtration resistance on the basis of the c. p. data of each component. Then, the filtration characteristics of the mixed slurry were predicted according to the modern filtration theory by using the predicted c. p. data. The validity of the calculation method was examined by comparing the experimental filtration characteristics with the model predictions. The presented method proved to be useful in the region rich in solid impurity, while a noticeable difference between the calculated and measured values in Ruth's filtration coefficient appeared in the region rich in filter aid.
    View full abstract
    Download PDF (845K)
  • The Effect of Particle Size and Shape on the Possibillity of Plug-phase Conveying
    Mitsushi FUTAMURA
    1995 Volume 32 Issue 8 Pages 557-565
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.557
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    It is desirable to apply plug-phase conveying to many kinds of bulk solids. In this paper, plug-phase conveying tests of irregularly shaped and flaky particles were carried out by making use of a practical scale line 50A pipe the max. length of which was 90m. Then, the permeabilty and blowing-off characteristics of plugs composed of various particle sizes and shapes were also examined in relationship to plug-phase conveyability.
    It was found that plug-phase conveyability is apt to decrease upon exceeding a certain value of the plug's permeability coefficient, C, min. fluidization velocity, Vmf, and blowing-off velocity, VB. It is possibile to judge plug-phase conveying mainly by the blowing-off characteristics of the plug.
    View full abstract
    Download PDF (3926K)
  • Characteristics and the Utilization of Bid-particles, Paramylon, Formed by Protist
    Kazutaka MIYATAKE, Shigeo TAKENAKA, Ryoichi YAMAJI, Yoshihisa NAKANO
    1995 Volume 32 Issue 8 Pages 566-572
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.566
    JOURNAL FREE ACCESS
    Download PDF (3235K)
  • Pressure Swing Fluidigation of Cohesive Fine Powders for Binderless Granulation
    Kazuo NISHII
    1995 Volume 32 Issue 8 Pages 579-581
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.579
    JOURNAL FREE ACCESS
    Download PDF (321K)
  • [title in Japanese]
    Shigeru SANO
    1995 Volume 32 Issue 8 Pages 582
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.582
    JOURNAL FREE ACCESS
    Download PDF (134K)
  • [title in Japanese]
    1995 Volume 32 Issue 8 Pages 583
    Published: August 10, 1995
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.32.583
    JOURNAL FREE ACCESS
    Download PDF (90K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top