Gypsum & Lime
Online ISSN : 2185-4351
ISSN-L : 0559-331X
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Volume 1969, Issue 100
Displaying 1-7 of 7 articles from this issue
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  • Properties of Quick Lime obtalined under Different Conditions of Calcination
    Osao SAKAEDA, Masamichi FUJIHARA
    1969 Volume 1969 Issue 100 Pages 106-114
    Published: May 01, 1969
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1969.106
    JOURNAL FREE ACCESS
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    The effect of conditions of calcination on the crystal configuration and specific surface area and the hydration reactivity of quick lime has been investigated and the following rasults were obtained.
    With the increase of calcining temperature, the crystals of quick lime grew in size and the specific surface area of each crystal became small and hence the hydration reactivity dropped.
    This tendency was strong in simply calcined quick lime (these quick lime obtained by the calcination without the addition of salts will be called “simply calcined quick lime”) obtained under oxidizing atmosphere especially at higher temperature than 1200°C.
    In the case of salt calcined quick lime (these quick lime obtained by the calcination with the addition of salts will be called “salt calcined quick lime”) obtained under reducing atmosphere, the crystals, even under the short time and low temperature calcination, grew very large in size.
    As the cause for this, it was supposed that the vapor of salts might promote some of the decomposed products of lime stone to diffusion into crystals.
    The crystals of simply calcined quick lime and of salt calcined quick lime which were obtained at low temperature had rugged surfaces whereas, the crystals of simply calcined, quick lime obtained at high temperature developed their crystalization and the dislocation figure appeared clearly and the crystals gathered closely.
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  • Chemical Composition and Heating Changes of Indian Dolomite and Magnesite Ores
    Chiaki SAKAMOTO, Masakazu ADACHI, Takako YOSHIDA
    1969 Volume 1969 Issue 100 Pages 115-126
    Published: May 01, 1969
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1969.115
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    In a part of the study for the purpose of the effective utilization of Indian dolomite and magnesite ores, some characteristic features of their heated samples weres examined. In addition, some other properties of the samples and their effects on the heating changes were investigated by means of chemical analysis of desired components and the microscopic observation of crystalline textures, etc., using also some samples of Japanese dolomite in comparison.
    The Indian samples are of typical dolomite composition, while the Japanese ores contain some amount of calcite, and show some characteristic behavior in the heating examination as compared with the normal ores. Iron, manganese, etc. in each sample were also determined, and their contents were compared with each other. Dolomites from Madras State, India resemble to those from Kuzu, Japan in their crystalline texture and heating changes, but the former contain some amount of siljca to which their tendency of faster dissociation on heating than any other sample is probably owing. Dolomites from Rajasthan State are high in crystallinity, and some retardation of the heat-dissociation was observed as compared with those from the above two districts.
    Next, magnesite from Madras State, India is of high purity, and contains a tiny amount of silica, and its characteristics for heat treatment was examined by the same method as in the above cases.
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  • Lime for Steel Manufacturing
    Kaichi FUKURO, Shunsuke MATUMURA
    1969 Volume 1969 Issue 100 Pages 127-138
    Published: May 01, 1969
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1969.127
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  • Calcination of Lime by Rotary Kiln
    Hajime NAKANISHI
    1969 Volume 1969 Issue 100 Pages 139-141
    Published: May 01, 1969
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1969.139
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  • Heat Balance of Calcimatic Kiln
    Koichi FUKURO, Shunsuke MATUMURA
    1969 Volume 1969 Issue 100 Pages 142-147
    Published: May 01, 1969
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1969.142
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    [in Japanese]
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  • Cross Flow Kiln
    Minoru HIRAI
    1969 Volume 1969 Issue 100 Pages 148-150
    Published: May 01, 1969
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1969.148
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  • Lime kiln of Beckenbach type
    Yukio MOTOJIMA, Yukio KITADA
    1969 Volume 1969 Issue 100 Pages 151-159
    Published: May 01, 1969
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1969.151
    JOURNAL FREE ACCESS
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