Journal of the Clay Science Society of Japan (in Japanese)
Online ISSN : 2186-3563
Print ISSN : 0470-6455
ISSN-L : 0470-6455
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Volume 31, Issue 4
Displaying 1-8 of 8 articles from this issue
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  • A Perspective on the Clay Mineral Study
    Application of Molecular Orbital Method
    Naoto MATSUE, Teruo HENMI, Naganori YOSHINAGA
    1992 Volume 31 Issue 4 Pages 190-195
    Published: February 25, 1992
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.31.190
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    Properties of layer silicate minerals are mainly controlled by structure factors, such as position of isomorphous substitution, elemental constituents, and amount of isomorphous substitution. Quantum chemical method allows us to understand the properties of layer silicate minerals on the basis of its electronic states. This method facilitates predictions on changes in the mineral properties due to the difference in a structure factor. A brief perspective on the application of quantum chemical method for layer silicate minerals is described.
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  • Elimination of Impurity in Sepiolite and It's Surface Area
    Yoshie KITAYAMA, Miho HAYAKAWA
    1992 Volume 31 Issue 4 Pages 196-201
    Published: February 25, 1992
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.31.196
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    Sepiolite of Spanish origin contained both calcite and dolomite which were detected by X-ray diffraction, infrared spectroscopy and thermal gravimetry-diffrential thermal analysis. These impurities were eliminated by treating with the dilute hydrochloric acid aqueous solution (0.59mol/1) without the decomposition of sepiolite itself. The specific surface area increased by the elimination of the impurity with dilute hydrochloric acid.
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  • Smectites in Bentonite Deposits, Black Hills, Wyoming
    Yasuaki UNO
    1992 Volume 31 Issue 4 Pages 202-211
    Published: February 25, 1992
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.31.202
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    Six bentonite beds, called bed A-F, are mined in northern and western Black Hills district, Wyoming. Chemical composition and mineralogical properties of smectites from these bentonite beds have been studied by X-ray powder diffraction method, chemical analysis, differential thermal analysis and infrared spectroscopy. Sodium is dominant interlayer cation in the specimens from bentonite beds, C, D, E and F, though calcium is main exchange cation in the specimen from bentonite bed A. The structural formulae calculated from chemical composition show that smectites from the bed D and E are beidellite, and the others are montmorillonite. The temperature of dehydroxylation peak in DTA curves of all specimens are higher than that of Cheto montmorillonite. The strength of 840cm-1 absorption band in infrared spectra increases with the substitution of Mg for Al in the octahedral sheet. Greene-Kelly test and variation of basal spacings of Na-saturated specimens at various relative humidity indicate that these smectites except bed D are the mixture of phases containing various layer charge component.
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  • Smectite in Concrete Aggregate
    in Relation to Evaluating Method of Aggregate
    Yasuaki UNO, Takahiko SASAKI, Hidenobu TATEMATSU
    1992 Volume 31 Issue 4 Pages 212-221
    Published: February 25, 1992
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.31.212
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    Chemical properties of smectites in concrete aggregates and its relation to the evaluation method of aggregate have been studied. Commonly many kind of volcanic rocks are utilized for concrete aggregate. Andesites collected from Kagawa and Saga Prefecture were investigated by polarizing microscope, electron microscope, XRD, DTA, EPMA and chemical analysis. It has been clear that plagioclase phenocrysts in andesites were often altered to smectite which was identified as beidellite by Greene-Kelly test. Alkali reactivity of aggregates was evaluated based on the correlation between dissolved silica (Sc) and reduction in alkalinity (Rc) estimated by conventional chemical method (ASTM C 289). Interlayer calcium and magmesium in smectite were completely exchanged for sodium in the sodium hydroxyde solution during this chemical test. Rc increases linearly in course of reaction time from 12 to 48 hours. We can obtain Rc0 value by extrapolating the temporal change curve of Rc to reaction time “0 hour”. It was found that Rc0 value approximates to total amount of exchangeable calcium and magnesium in samples. The result reveals that Rc0 value does not participate in alkali silica reactions, but is caused by cation exchange reactions of smectite, and that Rc0 in addition to Sc and Rc is important index for the evaluation of aggregates.
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  • Recent Bentonite Production Process at Kunimine Industries
    Kouji KOBAYASHI, Masakazu ITO
    1992 Volume 31 Issue 4 Pages 222-230
    Published: February 25, 1992
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.31.222
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  • Formation of Bentonite in South-West District, Gunma Prefecture, Japan
    Haruhiko AMANO
    1992 Volume 31 Issue 4 Pages 231-234
    Published: February 25, 1992
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.31.231
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  • The Trend of Study of Clay Minerals
    Makoto KOGA
    1992 Volume 31 Issue 4 Pages 235-243
    Published: February 25, 1992
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.31.235
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  • Erratum to : Phase Transformations of Fe-sepiolite under Dry and Hydrothermal Conditions
    1992 Volume 31 Issue 4 Pages 246
    Published: 1992
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.31.4_246
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