Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
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Volume 55, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • Chloride Stress Corrosion Cracking of Austenitic Stainless Steels in Salt Producing Plant
    SCC Prevention by Residual Stress Control
    Mikio TAKEMOTO
    2001 Volume 55 Issue 2 Pages 69-76
    Published: 2001
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.55.69
    JOURNAL FREE ACCESS
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  • Long-term Performance of Concrete under Marine Environment
    Hidenori HAMADA, Masami ABE, Tarek U.M., Toru YAMAJI, Hiroko WATANABE
    2001 Volume 55 Issue 2 Pages 77-86
    Published: 2001
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.55.77
    JOURNAL FREE ACCESS
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  • Introduction of Salt Science for Users-part 4
    What kind of Salt Do You Select?
    Noboru OGATA
    2001 Volume 55 Issue 2 Pages 87-90
    Published: 2001
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.55.87
    JOURNAL FREE ACCESS
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  • The Antisolvent Crystallization Phenomena of Sodium Chloride under the Existence of Potassium Chloride Impurities
    Shogo KANEKO, Yasuhiro YAMAGAMI, Izumi HIRASAWA
    2001 Volume 55 Issue 2 Pages 91-96
    Published: 2001
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.55.91
    JOURNAL FREE ACCESS
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    The antisolvent crystallization experiment was carried out batchwisely to study the crystallization phenomena of sodium chloride under the influence of potassium chloride impurities. To observe crystallization phenomena, supersaturation was produced by the addition of ethanol into the saturated solution of high ethanol concentration. The sodium chloride crystals obtained were found to be monodispersed under some operational conditions. It was suggested that monodispersed crystals were obtained when the supersaturation was controlled in an adequate range. Obtained crystals had smooth surfaces in the case of NaCl/KCl=6 and 10, but had hollowed surfaces in the case of NaCl/KCl=14 in the starting solution. The difference in crystal surface condition was considered to be influenced by the existence of potassium ion as impurities. The potassium content was increased when the potassium concentration was high in the starting solution. The induction period seemed to decrease when the potassium concentration was high in the starting solution. The average crystal size tended to decrease when the potassium concentration was high in the starting solution. These facts were considered in light of the phenomena, in which nucleation was accelerated by the existence of potassium ion and the average crystal size decreased with an increase in number of produced crystals.
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  • Lithium Adsorptive Properties of a New Type of Ion-sieve Adsorbent Based on Li2Cr(PO4)1.67
    Yoshitaka MIYAI, Hirofumi KANOH, Ramesh CHITRAKAR, Kenta OOI
    2001 Volume 55 Issue 2 Pages 97-102
    Published: 2001
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.55.97
    JOURNAL FREE ACCESS
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    A new selective adsorbent for lithium was prepared by means of extracting Li+ from Li2Cr(PO4)1.67 using acid.
    The fundamental ion exchange properties were investigated for the adsorbent. The selectivity sequence for alkali metal ions was Cs≅K<Na<Li at pH 8.
    The adsorbent showed a selective adsorptivity for lithium in sea water. Concentration factors were above 3.3×104 for lithium, while below 8.0 for the other alkali metal ions.
    The equilibrium lithium uptake reached 9.3 mg/g in sea water. This value corresponds to half of the lithium content of lithium ores such as petalite and lepidolite. Thus, this adsorbent demonstrated good adsorptivity next to that of spine 1-type manganese oxides. The adsorbent showed high acidity and selective adsorptivity for lithium at weak-acidity (pH 3) levels and the highest adsorptive capacity above pH 6.2.
    The recovery of lithium from geothermal water and brine above pH 3 by using the present adsorbent has been proposed on the basis of these results.
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