Gypsum & Lime
Online ISSN : 2185-4351
ISSN-L : 0559-331X
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Volume 1994, Issue 248
Displaying 1-10 of 10 articles from this issue
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  • Development of Novel Dissolution Method Using Ion Exchange Resin
    Tadashi NISHINO
    1994 Volume 1994 Issue 248 Pages 3-16
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.3
    JOURNAL FREE ACCESS
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  • Crystal Shape and Size Controls of Xonotlite
    Yasuo ARAI, Tamotsu YASUE, Shigeki AOKI, Atsushi KOKUMAI, Yoshiyuki KO ...
    1994 Volume 1994 Issue 248 Pages 17-25
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.17
    JOURNAL FREE ACCESS
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    In relation to density control in manufacturing fire-proof insulating material of xonotlite, studies were made to investigate crystal shape and size controls of xonotlite producing hydro-thermally at 197°C (15kgf/cm2) for required time after grinding and mixing quick lime (CaO, 97%) and silica stone (SiO2, 98%) with changing from 0.90 to 1.05 in CaO/SiO2 mole ratio and from 8 to 30 in water/solid-material ratio.
    Characterization of xonotlite was carried by X-ray diffraction, scanning electron-microscopic observation, bulk density measurement and so on.
    The most important factor for controlling crystal size and bulk density of spherical secondary particles was water/solid-material ratio in hydrothermal reaction of CaO-SiO2-H2O system. For an example, in the case of CaO/SiO2 mole ratio 0.975, mean size of the particles was about 60 μm (bulk density 0.13g/cm3) with water/solid-material ratio 30 while about 30 μm (0.20g/ cm3) with water/solid-material ratio 8. On the other hand, mean size of the particles could be grown to about 100 μm in size by the coexistence of KOH solution. The trial preparation and characteristics of artificial wood-like material for building using xonotlite of different density were also discussed.
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  • Removal Characteristics of Gyrolite for Heavy Metallic Ions
    Michihiro MIYAKE, Takashi SUZUKI, Takeshi MITSUDA
    1994 Volume 1994 Issue 248 Pages 26-31
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.26
    JOURNAL FREE ACCESS
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    Gyrolite [Ca8Si12O
    30 (OH) 4·6H2O] have been hydrothermally synthesized at 220°C under saturated steam pressure, and its removal characteristics for divalent heavy metallic ions (M2+=Co2+, Ni2+, Zn2+, Cd2+, and Pb2+) have been investigated, using a normal batch method at 25°C.
    The M2+ uptake phenomenon appeared to be a cation-exchange reaction between M2+ ions in aqueous solution and Ca2+ ions in gyrolite. Co2+ of ca. 2.3x 10-3, Ni2+ of ca. 3.4 x10-3, Zn2+ of ca. 1.9×10-3, Cd2+ of ca. 0.9×10-3, and Pb2+ of ca. 1.4×10-3 mol/g were taken up at steady states, respectively. Gyrolites, after the reactions, were consider to maintain the basic layer structure with a basal spacing of ca. 22 A. Gyrolite was found to exhibit selectivity in the following order; Ca2+ < Cd2+ < Pb2+ < Zn2+ < Co2+ < Ni2+ in the low-concentration regions of M2+ ions from the cation-exchange isotherms. These results, therefore, suggest that gyrolite may be useful for separation and waste disposal.
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  • Molecular Orbital Approach to the SiKβ Energy Shifts by the Second-Nearest-Neighbor Phosphorus Atoms
    Toshinori OKURA, Giichi SUDOH, Takafumi KANAZAWA
    1994 Volume 1994 Issue 248 Pages 32-36
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.32
    JOURNAL FREE ACCESS
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    A effect by the second-nearest-neighbor P atoms on the energy shifts of SiKβ in several phosphorus-containing silicates was studied using a high-resolution X-ray fluorescence spectrometer. The SiKβ emissions shifted to the lower energy side corresponding to the increase in the content of P atoms. The energy shifts of SiKβ main peak were discussed using the Xα molecular orbital theory and were attributed to the change in the effective charge on Si atoms due to the existence of the second-nearest-neighbor P atoms.
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  • The Properties of the Expansive Stress of Non-Explosive Demolition Agent In Long Period of Time
    Koichi SOEDA, Kazuyoshi TSUCHIYA, Makoto MATSUHISA, Tetsuo HARADA
    1994 Volume 1994 Issue 248 Pages 37-43
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.37
    JOURNAL FREE ACCESS
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    The properties of the expansive stress of non-explosive demolition agent in long period of time has not been examined up to now, because the agent can demolish rocks or concrete within 24 hours.
    Recently, several researches have been carried out using non-explosive demolition agent for anchoring FRP tendons or chemical jack. So, stability of the agent in long period of time should be recognized for these usages.
    This report examines the expansive stress, degree of quick lime hydration, and pore structure in order to recognize the stability of hydrated agent in long period of time. The results are as follows.
    1) The expansive stress of the agent increased gradually and no reduction was observed in 1 year.
    2) The relationship between the degree of hydration and the expansive stress in long period of time was similar to that in short period.
    3) The pore volume of the hydrate decreased and the structure of the hydrate became compacter as time passed.
    4) From above results, the hydrated agent is considered to be stable in long period of time.
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  • Influence of Vanadium on the Basic Bricks Used in the Lime Kiln
    Toru HONDA, Yoshiharu KAJITA, Yoshiki TSUCHIYA, Shigetoshi OHTA
    1994 Volume 1994 Issue 248 Pages 44-52
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.44
    JOURNAL FREE ACCESS
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  • Novel Hg System High-Tc Superconductor with Ca
    Motohide MATSUDA, Kimihiro YAMASHITA, Takao UMEGAKI
    1994 Volume 1994 Issue 248 Pages 53-57
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.53
    JOURNAL FREE ACCESS
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  • Trade Secret for Researchers
    Yasuo TSURUTA
    1994 Volume 1994 Issue 248 Pages 58-64
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.58
    JOURNAL FREE ACCESS
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  • Recent Technology for the Removal, Recovery and Disposal of Carbon Dioxide
    Yusuke MORIYOSHI
    1994 Volume 1994 Issue 248 Pages 65-70
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.65
    JOURNAL FREE ACCESS
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  • The Air Pollution and Its Countermeasure in Korea
    Yasuji HIMI
    1994 Volume 1994 Issue 248 Pages 71-81
    Published: January 01, 1994
    Released on J-STAGE: March 07, 2011
    DOIhttps://doi.org/10.11451/mukimate1953.1994.71
    JOURNAL FREE ACCESS
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