海流及び波力を利用した浮体式海水ウラン採取システムの開発 (その1)

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タイトル別名
  • Development of Floating Type-Extraction System of Uranium from Sea Water Using Sea Water Current and Wave Power
  • カイリュウ オヨビ ハリョク オ リヨウシタ フタイシキ カイスイ ウラン サ

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The concept of the extraction system of uranium from sea water using sea water current and wave power by the application of sphrical fiber adsorbents is presented in this paper. The adsorbent bed system consists of thin disk cartridges enclosed in nets and arranged below the sea surface in horizontal layers by suspending ropes hung from a cylindrical buoy with a hole in the centre. These cartridges filled with the adsorbents are transferred from the ships hold to the buoy by the ship board crane and are fixed to the suspended ropes. The ropes are the unwound through the center hole so as to place the adsorbent beds in the sea water current which enables the current to pass through the adsorbent beds. The exchange of sea water around the adsorbents is improved by the heaving motion of the buoy due to waves. After about 40 days, the adsorbent beds are recovered using the same process, the cartridges are transferred into a tank for the elution process. Throughout the above processes, the adsorbents are not taken out of the cartridges.<BR>The model tests of a cylindrical buoy with adsorbent beds are carried out in uniform flow as well as in regular waves. The displacements of the adsorbent beds in the flow and the heave motion of the buoy with adsorbent beds suspended from it are analysed.<BR>Furthermore, numerical simulation of this system was carried out for practical operation in the ocean and the production cost of uranium extraction was calculated to be 41, 800 yen/kg, where adsorptive ratio is assumed to be 3.2mg/g. 40days.

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