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Report No.
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Synthesis and practical scale system of braid adsorbent for uranium recovery from seawater

Tamada, Masao; Seko, Noriaki; Kasai, Noboru; Shimizu, Takao*

Braid adsorbent having functional group of amidoxime is a promising material for the recovery of uranium dissolved in the seawater. This braid adsorbent was made by polyethylene multi-fibers in which amidoxime groups were introduced by radiation-induced graft polymerization and subsequent chemical treatment. Reaction time for graft polymerization was 5 h and the resulted braid adsorbent had 2.8 mmol/g-adsorbent of amidoxime group. The braid adsorbent obtained was moored at the offing of Okinawa Island. The adsorption of uranium reached 1.5g/kg-adsorbent for 30 d soaking. The mooring system for braid adsorbent has possibility which reduced the cost for the recovery of uranium from seawater. It is shown that 134 km$$^{2}$$ of mooring area is needed for annual product of 1200 tons of uranium. In addition, there is 6000 km$$^{2}$$ and more of suitable sea area for the collection of the uranium in the regions from Okinawa Islands to Tosa Bay in Japan.

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