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 25, Issue 8
Displaying 1-6 of 6 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • The Effect of Additives on Size Reduction and Modification by Impact Comminution (II)
    Improved Efficiency and Simultaneous Surface Modification
    Masaru KOGANAZAWA, Kenji HAMADA, Takamasa TANAKA, Mamoru SENNA
    1988 Volume 25 Issue 8 Pages 500-506
    Published: August 10, 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.25.500
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Surface modification, size reduction and the improvement of energy efficiency were achieved simultaneously by using organic additives during continuous grinding with a commercial disintegrator (Cosmomizer, Nara Machinery). Triethanol amine(TEA) and toluene solution of stearic acid (SA) in varying concentrations were used as additives. While the organophilization of limestone with SA was detected, the addition of TEA caused the opposite effect. The adhesion of TEA to the limestone was tighter when it was used as a grinding aid than when it was simply added through impregnation. This was suspeted to be the result of a tribochemical reaction.
    View full abstract
    Download PDF (2670K)
  • Observation of the Flow Pattern and Level Control of a Hopper by Using the Image Processing
    Kenzou WADA, Hitoshi OKA, Tsuyoshi SYOUDA, Nobuo HAYANO
    1988 Volume 25 Issue 8 Pages 507-513
    Published: August 10, 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.25.507
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Recently, the technique of image processing has been used for many purposes. This report is concerned with the flow pattern and level control of a hopper by using an image processing apparatus.
    The flow pattern of granules inside the hopper changes at the transitional bed height (Htr). Htr is the bed height at which flow pattern of granules changes from mass flow to core flow or vice versa. The flow pattern of granules is uniform in the upperpart of Htr. In this sense, it is easy to control the level of the hopper, because the surface of granules in the hopper is kept constant.
    The flow pattern was first observed by using a video camera and image processing unit. The position of Htr was measured. Then, the bed height of the hopper was controlled at the upper part of Htr. The time to operate the image and to transmit the image data to a personal computer, and which is necessary for the image processing, was reduced to maintain good response waves. In order to do so, the area used for data processing of the flow pattern decreased, and the method of extracting useful information from the image data is discussed.
    As for the results, we could obtain good response waves in the level control of hopper.
    View full abstract
    Download PDF (964K)
  • Measurements of Flow Rate and Particle Size by the Analysis of Flow Noise Radiated from a Cylindrical Hopper
    Jusuke HIDAKA, Atsuko SHIMOSAKA, Shigeo MIWA
    1988 Volume 25 Issue 8 Pages 514-522
    Published: August 10, 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.25.514
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The acoustic noise generated by flowing particles in a cylindrical hopper was studied to simultaneously measure the flow rate and particle size.
    First, the pressure waveform of flow noise from flowing particles on an inclined plate was estimated on the basis of the generation mechanism of the impact sound when two particles collide on the plate. The frequency spectrum of the calculated pressure waveform agrees well with the measured one. Correlation between the flow rate and the pressure of the flow noise was obtained. The frequency of the flow noise was closely related to the diameter of the particle.
    The frequency spectrum of the flow noise in a cylindrical hopper was similar to that of the flow noise from flowing particles on the inclined plate. From these results, the particle size and flow rate can be measured simultaneously by the frequency spectrum of flow noise from a cylindrical hopper.
    View full abstract
    Download PDF (951K)
  • A Study on Ball Mills in Preparation of a High Concentration Coal Water Mixture
    Hayami ITO, Shuhei TATSUMI, Shoichi TAKAO, Harumi FUJIMOTO, Hironori O ...
    1988 Volume 25 Issue 8 Pages 523-527
    Published: August 10, 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.25.523
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    When a high concentration coal water mixture (CWM) is burned, coarse particles in CWM tend to remain as unburned carbon. To reduce the number of particles larger than 149μm, while simultaneously maintaining low power consumption, grinding tests were performed by using the ball mills in the laboratory and the pilot plant. The test results show that the best selection of ball mills and their grinding system is to increase the length-to-diameter ratio and the number of compartments, as well as to combine two ball mills in series.
    View full abstract
    Download PDF (571K)
  • Advances in Superplasticity and in Superplastic Materials (I)
    Phenomenological Expressions of Superplasticity
    Kenji HIGASHI
    1988 Volume 25 Issue 8 Pages 528-536
    Published: August 10, 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.25.528
    JOURNAL FREE ACCESS
    Download PDF (4213K)
  • [title in Japanese]
    Toshio INOUE
    1988 Volume 25 Issue 8 Pages 551-553
    Published: August 10, 1988
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.25.551
    JOURNAL FREE ACCESS
    Download PDF (336K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top