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 38, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • Corrosion and Protection in Saline Water
    Hideo TOGANO
    1984 Volume 38 Issue 4 Pages 191-204
    Published: 1984
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.38.191
    JOURNAL FREE ACCESS
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  • Desorption of Uranium from Hydrous Titanium Oxide
    Studies on the Extraction of Rare Elements from Sea Water (Part 3)
    Saburo SENOH, Yasuyoshi ODA, Hideo KONISHI
    1984 Volume 38 Issue 4 Pages 205-211
    Published: 1984
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.38.205
    JOURNAL FREE ACCESS
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    The investigation of various methods for desorbing uranium from hydrous titanium oxide revealed the desirability of using as eluant the aqueous solution of alkali carbonate with the carbonic ion concentration of 0.4 mol/liter and the volume factor of M1/ (W2/222) ≥1
    The eluting efficiency, which was expressed as F=klogt+F0, was found to be unaffected by the adsorbent particle size, and the desorption rate was found not to be controlled by diffusion
    .It was also found possible in multistage desorption, where the eluting solution came into contact with the successive stages of hydrous titanium oxide containing adsorbed uranium, to obtain eluatecontaining the high concentration of uranium by supplying additional eluant sufficient to maintain an appropriate eluant concentration in the eluting solution and an appropriate volume factor
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  • Electrodialytic Recovery of Desorbing Agent from Eluate Containing Sea-Water Uranium
    Studies on the Extraction of Rare Elements from Sea Water (Part 4)
    Saburo SENOH, Yasuyoshi ODA, Hideo KONISHI
    1984 Volume 38 Issue 4 Pages 212-217
    Published: 1984
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.38.212
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    Uranium was adsorbed from sea water, and then desorbed by the aqueous solution of alkali carbonate. The resulting solution was treated by electrodialysis with a combi nation of univalent selective anion exchange membrane and either selective or non -selective cation exchange membrane.With this process, it was found possible to selectively remove the alkali carbonate fr om the system by retaining the uranium in the solution.
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  • Hydrous Titanium Oxides as Adsorbent for Uranium
    Studies on the Extraction of Rare Elements from SeaWater (Part 5)
    Saburo SENOH, Yasuyoshi ODA, Hideo KONISHI
    1984 Volume 38 Issue 4 Pages 218-226
    Published: 1984
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.38.218
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    Hydrous titanium oxides produced in stainless steel reactors were found to exhibit better adsorption of uranium than those obtained in glass reactors. Hydrous titanium oxide manufactured from titanic solution containing Fe ion was also found to exhibit relatively high uranium adsortivity.
    Observation by electron microscope revealed that hydrous titanium oxide particles from glass reactors were similar in form to glass fragments, while those from stainless steel reactors and commercial titanium oxide manufacturing processes were found to be spherical in form.
    X-ray diffraction showed all of these hydrous titanium oxides to be of the anatase type. Diffraction charts of amorphous hydrous titanium oxides after their use in the uranium adsorption-desorption process showed some difference from charts obtained before use, while such difference was not observed in charts of crystalline hydrous titanium oxides. This suggested that these two groups of materials differed in uranium adsorption-desorption mechanism. Heating of crystalline hydrous titanium oxides to 600°C caused no significant change in their crystal structure, but they were fully transformed to anatase at 800°C, and to rutile at 1,000°C.
    In both thermogravimetric analysis and differential thermal analysis, these hydrous titanium oxides exhibited considerable heat absorption and weight loss due to the evaporation of water. The hydrous titanium oxide manufactured by a company in particular underwent a great loss of weight in the temperature ranges from 550°C to 725°C and from 900°C to 1,000°C. The cause was not made clear.
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  • Recovery of Rare Elements Other than Uranium from Sea Water
    Studies on the Extraction of Rare Elements from Sea Water (Part 6)
    Saburo SENOH, Yasuyoshi ODA, Hideo KONISHI
    1984 Volume 38 Issue 4 Pages 227-232
    Published: 1984
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.38.227
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    In the course of studies on the recovery of uranium from sea water by using hydrous titanium oxide as adsorbent, the recovery by adsorption of other rare elements was also investigated. The adsorption of lithium and vanadium was found to be too small to allow recovery, but the adsorption of strontium was sufficient for recovery. Effective strontium desorption was found to be possible with acids but not with alkali carbonate, the desorption agent most commonly used for uranium desorption. The amount of adsorbed strontium and calcium increased in each cycle of uranium adsorption and desorption, while no significant increace was found in the amount of magnesium adsorption after the first cycle when post-washing with fresh water was conducted.
    The ratio between the quantities of strontium and calcium adsorbed was constant, and was the same as that in the sea water.
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  • Potentials of New Forms of Lead Dioxide Anodes in the Electrolysis of Aqueous Sodium Chloride
    Minoru UEDA, Akira FUKASAWA
    1984 Volume 38 Issue 4 Pages 233-235
    Published: 1984
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.38.233
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    To examine the applicability of new forms of PbO2 anodes to chlorine production, potentials of these anodes in the electrolysis of aqueous NaCl solution (300g/l) were measured by a quasistationary galvanostatic method and compared with the potentials measured in the same way for graphite, platinum and RuO2-TiO2 (DSA-type) anodes.
    The potentials of the PbO2 anodes were higher than that of the DSA-type anode, but lower than that of the platinum anode. The potential of the α-PbO2 anode was lower than that of the β-PbO2anode, which was about the same as the potential of the graphite anode. The α-PbO2 anode may be suitable for producing NaClO. In the use of the β-PbO2 anode, the addition of surfactants to the anolyte was found to be effective in facilitating the liberation of the bubbles formed on the anode surface and accordingly lowering the potential.
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  • Composition and Quality of Salts
    Masayoshi MURAKAMI
    1984 Volume 38 Issue 4 Pages 236-251
    Published: 1984
    Released on J-STAGE: February 19, 2013
    DOIhttps://doi.org/10.11457/swsj1965.38.236
    JOURNAL FREE ACCESS
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