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 47, Issue 6
Displaying 1-4 of 4 articles from this issue
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  • Recovery of Uranium from Seawater by Use of a Horizontally-Transferring Fluidized-Bed System
    Takahiro HIROTSU, Norio TAKAGI, Shunsaku KATOH, Kazuhiko SUGASAKA, Nob ...
    1993 Volume 47 Issue 6 Pages 359-368
    Published: 1993
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.47.359
    JOURNAL FREE ACCESS
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    From a viewpoint of adsorption of uranium on adsorbent particles from seawater, we have designed a horizontally-transferring fluidized-bed system with 15 fluidized-bed units where the fluidized particles can transfer in sequence. This system makes possible addition and collection of the adsorbent without interruption of running the apparatus. An average time of contact of the adsorbent with seawater can be determined by an addition rate of the adsorbent and a retention volume of the fluidized bed units. The pressure-loss is very low because of no utilization of filters in the system. Adsorption of uranium on fluidized ainidoxime-resin particles from seawater was successfully explored by use of the apparatus over approximately one year, the extent of uranium recovery being 49% in the winter season and 80% in the summer season.
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  • Bi-Ionic Potential across Poly (4-Vinylpyridine-co-Styrene) Membranes
    Ryotaro KIYONO, Akihiro KUWASHITA, Tadahiro NISHIZAWA, Masayoshi YAMAG ...
    1993 Volume 47 Issue 6 Pages 369-374
    Published: 1993
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.47.369
    JOURNAL FREE ACCESS
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    Measurements of bi-ionic potential across anion-exchange membranes were carried out for KCl/mem-brane/KIO3 systems. Anion-exchange membranes used were prepared by copolymerization of 4-vinyl-pyridine and styrene with 2, 2'-azobisisobutyronitrile as initiator, and then quaternized with methyl iodide or 1,6-dibromo-n-hexane. The absolute values of bi-ionic potential increased with an increase in the external electrolyte molality even though the transport number of counterions in the membrane was nearly unity. The magnitude of bi-ionic potential was discussed in connection with the properties of membranes. The value of bi-ionic potential was larger if the membrane has the lower water content and the higher weight fraction of hydrophobic membrane matrix. The dependence of bi-ionic potential on the molality of the external solution was assigned to the decrease in free water in the membrane with varying the swelling pressure by the change in the external molality.
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  • Salt Deposit in Concentrating Process of Refined Brine
    Masayoshi MURAKAMI
    1993 Volume 47 Issue 6 Pages 375-378
    Published: 1993
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.47.375
    JOURNAL FREE ACCESS
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  • The Material Flow of Salt
    Dennis S. KOSTICK, Toshio HASHIMOTO
    1993 Volume 47 Issue 6 Pages 379-405
    Published: 1993
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.47.379
    JOURNAL FREE ACCESS
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    [in Japanese]
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