Gypsum & Lime
Online ISSN : 2185-4351
ISSN-L : 0559-331X
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Volume 1989, Issue 223
Displaying 1-5 of 5 articles from this issue
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  • Synthesis and Dehydration of Cobalt Hydrogenphosphate Hydrate
    Yoshitomo TODA, Takayori SATO, Sadao MURATA, Koshiro HASHIMOTO, Yasuo ...
    1989 Volume 1989 Issue 223 Pages 355-362
    Published: November 01, 1989
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1989.355
    JOURNAL FREE ACCESS
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    The formation process and thermal change of cobalt hydrogenphosphate were investigated by means of X-ray diffraction, thermal analyses (TG-DTA) and chemical analysis. Four hydrates of the phosphates were prepared by aging for about 30 days at 96°C of suspension which formed by dropping KOH/H3PO4 solutions (mol ratio 2) into 0.5mol/l CoCl2 solution. The composition of the four hydrate was influenced considerably by aging time and changed in CoHPO4·nH2O (spherical crystal with about 30μm, violet) at the early stage of the reaction, CoHPO4.2H2O (platy crystal with about 8×0.5μm, pale purplish pink) after 2 days, CoHPO4·3/2H2O (platy crystal with about 80×10μm, light purplish pink) after 10 days and new phase of CoHPO4·3/4 H2O (platy crystal with about 10×2μm, strong reddish purple) after 30 days.
    The dehydration and condensation of four hydrates on heating were summarized as follows;1) CoHPO4·nH2O 256°C-Amorphous phase 600°C-α-Co7P2O7 2) CoHPO4·2H2O about 130°C (first step) -CoHPO4 250°C (second step) -Amorphous phase 594°C-α-Co7P2O7 3) CoHPO4·3/2 H2O 253°C-CoHPO4·1/2H2O (new phase) 308°C-α-Co7P2O7 4) CoHPO4·3/4H2O 363°C-α-Co7P2O7
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  • Reaction Characteristics of Calcium Carbonates with Manganese Ions
    Michihiro MIYAKE, Shinji IMAGAWA, Hiroshi NAGASAWA, Hiroichi TANAKA, T ...
    1989 Volume 1989 Issue 223 Pages 363-367
    Published: November 01, 1989
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1989.363
    JOURNAL FREE ACCESS
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    Reaction characteristics of calcium carbonates (calcite, aragonite and vaterite) with Mn2+ ions in aqueous solutions containing various counter-anions (CL-, NO3- and CH3COO-) have been investigated using a normal batch method at 25°C.
    The reaction characteristics are independent of the kind of counter-anions, and the order of the reaction rates was found to be as follows; vaterite > aragonite >> calcite. About 80% of Ca2+ions were released from aragonite and vaterite during long time reactions. Although Mn2+ ions were fixed as Ca-substituted manganese carbonates by aragonite and vaterite, the ions scarcely reacted with calcite. The amount of Ca in Ca-substituted manganese carbonates, whose morphologies were different from those of starting materials, increased with increasing reaction time. From the curious results, it was concluded that the immobilization of Mn2+ ions in aqueous solution using aragonite and vaterite proceeds by a complexed ion-exchange mechanism with a reverse ion-exchange reaction of Mn2+ ions in manganese carbonate for Ca2+ in aqueous solution.
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  • Yearly Variation of Air Pollution
    Yoshio SAIKI
    1989 Volume 1989 Issue 223 Pages 368-374
    Published: November 01, 1989
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1989.368
    JOURNAL FREE ACCESS
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  • Solid-State High-Resolution Nucleare Magnetic Resonance
    Yoshihiko OKADA
    1989 Volume 1989 Issue 223 Pages 375-389
    Published: November 01, 1989
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1989.375
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  • Composition of Film and Anodizing for Magnesium Alloys
    Matsufumi TAKAYA
    1989 Volume 1989 Issue 223 Pages 390-397
    Published: November 01, 1989
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1989.390
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