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 28, Issue 5
Displaying 1-7 of 7 articles from this issue
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  • The Simultaneous Operation of Granulation, Grinding and Separation by a Continuous Rotating Conical Vessel
    The Effect of Operating Conditions on the Granule Shape
    Masunori SUGIMOTO, Masaki SUGIHARA, Naoko YOKOTA, Takeshi HAYASHIDA
    1991 Volume 28 Issue 5 Pages 300-306
    Published: May 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.300
    JOURNAL FREE ACCESS
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    To develop a continuous granulation process for the transformation of fine powder into the smaller and more spherical granules, the operations of granulation, grinding and separation are performed simultaneously in a continuous rotating conical vessel.
    The experiments are carried out by using CaCO3-powder and water. The effect of the operating conditions on the shape of granules is investigated on the basis of a continuous granulation process model of the simultaneous operation. It can be considered, in the present model, that the shape characteristics of the final product are given by two kinds of granules differing in shape. One is more spherical granules which are made to round with the number of total cascading flow passing through the conical vessel, and the other is non-spherical ground granules the amounts of which increase with the feed ratio of the binder to the powder.
    As a result, it is possible to continuously make a fine powder into smaller and more spherical granules by the above simultaneous operation under appropriate conditions of a smaller feed ratio and the larger number of the cascading flow through the conical vessel.
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  • A Reduction in the Pulsating Wall Pressure Near the Transition Point in a Bin
    The Effect of Widening the Bin Cylindrical Section
    Ryuichi MORIYAMA, Tomosada JOTAKI
    1991 Volume 28 Issue 5 Pages 307-311
    Published: May 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.307
    JOURNAL FREE ACCESS
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    This paper outlines an approach to reducing the pulsating wall pressure near the transition point in a bin which is generated during the discharge of a dense bed achieved by peripheral feeding. The authors present a method for controlling the flow of the dense bed by means of installing a device that widens the cylindrical section near the bin transition point, thus changing the flow from a dense bed to a loose bed state. The stress states in the hopper section before and during discharge are explained by Mohr circles.
    In particular, this method can reduce the pulsating wall pressure in the hopper that maintains the dense bed in the cylindrical section of the bin.
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  • Distribution of Void Fraction in a Powder Layer Formed on Filter Paper by Dust Collection
    Yasushige MORI, Takayuki FUJITA
    1991 Volume 28 Issue 5 Pages 312-317
    Published: May 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.312
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    The distribution of the void fraction in the powder layer is one of the most fundamental properties in the estimation of pressure loss through the powder layer formed by filter dust collection. In this report, the void fraction of the fly ash powder layer collected on a filter paper is discussed. It was confirmed that the powder layer formed by air flow loaded dust has a distribution of the void fraction in the direction of air flow. The void fraction was 0.8 at the surface and was 0.6 at the bottom of the powder layer. The relationship between the average void fraction and the thickness of the powder layer could satisfactorily be estimated by using Kawakita's or our experimental correlations as the compression equation, and Carman's equation as the permeation equation. The effect of Knudsen flow on the permeation increased as the void fraction decreased.
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  • [title in Japanese]
    Hiroshi TSUNAKAWA
    1991 Volume 28 Issue 5 Pages 329-330
    Published: May 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.329
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1991 Volume 28 Issue 5 Pages 331-334
    Published: May 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.331
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1991 Volume 28 Issue 5 Pages 335-338
    Published: May 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.335
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  • [title in Japanese]
    Makio NAITO
    1991 Volume 28 Issue 5 Pages 339-341
    Published: May 10, 1991
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.28.339
    JOURNAL FREE ACCESS
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