Gypsum & Lime
Online ISSN : 2185-4351
ISSN-L : 0559-331X
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Volume 1955, Issue 19
Displaying 1-8 of 8 articles from this issue
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  • Studies on By produced Gypsum from Salt Making (Part 1)
    On Manufacturing Methods of Gypsum by Treatment of Bittern with Calcium Chloride
    Shoichi NISHIDA, Mituo WAKIMOTO, Teruhisa CHUMAN, Tomonari MAEDA
    1955 Volume 1955 Issue 19 Pages 1014-1022
    Published: November 01, 1955
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1955.1014
    JOURNAL FREE ACCESS
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    We investigated the conditions under which granular, dense and colorless crystal of gypsum. could be obtained without adding extraneous anions nor using recrystallization method of hemihydrate in the treatment of bittern with calcium chloride.
    The results are summarized as follows : Granular and colorless gypsum can easily be produced by controlling the following physical, chemical conditions, irrespective of concentration of the raw materials :
    1) Pouring simultaneouly both reaction solutions into the reaction vessel in order to reduce [Ca″] × [SO4″] ion product and reaction velocity.
    2) Maintaining the reaction temperature as high as possible, but in the range of CaSO4·2H2O formation.
    3) Maintaining suspension density of crystals as dense as possible, to delay crystal growth.
    4) Using faint colored or debromided bittern, the latter having been previously treated with chlorine.
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  • Studies on Chemical Composition of Dolomites in Japan Proper
    Yoshiaki SANADA, Kiyoshi MIYAZAWA
    1955 Volume 1955 Issue 19 Pages 1023-1026
    Published: November 01, 1955
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1955.1023
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    On calculating of dolomites in Japan proper, thinking of calcite (CaCO3) being mixed in pure dolomite (CaCO3. MgCO3), which included little impure components, it was recognized that chemically analyzed CaO value agreed with almost theoretically calculated data. By X-ray test, it was found in dolomites in Japan that the ground mass was pure dolomite in the form of CaCO3·MgCO3 or consisted of this and solid solution of a little other components, and adding thus, intermixed calcite. On limestones from Kuzuu, having 0.8% of MgO, it was confirmed that MgCO3 took the form of dolomite.
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  • Studies on Gypsum byproduced from Phosphoric Acid Process
    (I) Statistical Analysis on Crystallization
    Tamotsu YAMADA, Yasuhiro TAMAKI
    1955 Volume 1955 Issue 19 Pages 1026-1030
    Published: November 01, 1955
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1955.1026
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    Crystallizing conditions of gross gypsum crystal were discussed statistically, and were concluded as following :
    1) Three temperatures of decomposing the phosphate with 50° Be' H2SO4 were analysed as “highly significant” between 86° and 120° or 180°C.
    2) Three ground phosphate, 80-150, 150-250, and 250-mesh of Tyler sieve, were discussed and was “significant” 80-150 mesh.
    3) Conditions producible hemihydrate gypsum (H2SO4 of 40 % or 30 % was used) were adapted and the hemi-hydrate were recrystallized to dihyrate 1. merely washing with water. 2. with water and temperature, 3. with 1 % Sodium tertarate solution, 4. same as 3. but with temperature, 5. same as 3. but after neutralized. Recrystallizing conditions were analysed as “highly significant” between 1. and 3.
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  • [title in Japanese]
    [in Japanese]
    1955 Volume 1955 Issue 19 Pages 1030-1035
    Published: November 01, 1955
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1955.1030
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  • [title in Japanese]
    [in Japanese]
    1955 Volume 1955 Issue 19 Pages 1036-1038
    Published: November 01, 1955
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1955.1036
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  • [title in Japanese]
    [in Japanese]
    1955 Volume 1955 Issue 19 Pages 1038-1043
    Published: November 01, 1955
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1955.1038
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1955 Volume 1955 Issue 19 Pages 1043-1045
    Published: November 01, 1955
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1955.1043
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1955 Volume 1955 Issue 19 Pages 1046-1050
    Published: November 01, 1955
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1955.1046
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