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Seko, Noriaki; Kasai, Noboru; Tamada, Masao; Hasegawa, Shin; Katakai, Akio; Sugo, Takanobu*
JAERI-Tech 2004-076, 78 Pages, 2005/01
In September 1999, we have soaked 200 kg of fibrous amidoxime adsorbents, synthesized by radiation-induced graft polymerization, into seawater to evaluate their performance. Fractional elution facility was set effectively to elute the rare metals on adsorbents in Mutsu-Establishment. This facility consists of two parts of pre-washing and elution. The present report dealt with planning, manufacture and setting of fractional facility. Marine organism and slime on adsorbent cassette (290290160 mm) were washed out and every 72 cassettes were set in elution unit (12101210H1460 mm) with nonwoven materials as a packing to avoid elution loss. In the elution process alkaline and alkaline earth metals were eluted with low concentration hydrochloric acid (0.01M) and rare metals were eluted with high concentration (0.5M) after the packing of elution unit into fractional elution facility.
Tamada, Masao
Enerugi Rebyu, 22(4), p.24 - 26, 2002/03
The Black Current conveys 5.2 million tons of uranium toward the offing of Japan, though uranium concentration is only 3.3 ppb in seawater. Recovery of 0.2% of this resources can supply the uranium for all atomic power plants in Japan. Graft polymerization is a promising technique to prepare adsorbent having high selectivity to uranium in seawater and enough durability in severe sea conditions. To evaluate the activity of the adsorbents the equipment for the recovery of rare metals from seawater was set at the 7 km offing of Mutsu-Sekine, Aomori prefecture on September, 1999. In three years (1999 - 2001) 9 mooring experiments of adsorbents were carried out and 1 kg uranium as yellow cake was recovered. This experiment suggested that hydrophilic monomer and trunk polymer should be improved to realized the higher activity for uranium recovery from seawater.
Tamada, Masao; Kasai, Noboru; Seko, Noriaki; Hasegawa, Shin; Takeda, Hayato*; Katakai, Akio; Sugo, Takanobu
JAERI-Tech 2000-072, 40 Pages, 2000/12
no abstracts in English