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光還元を利用した模擬放射性廃液からの有用元素回収に関する研究

Study on recovery of useful elements from simulated radioactive liquid waste by photo-reduction

大場 弘則; 佐伯 盛久; 利光 正章

Oba, Hironori; Saeki, Morihisa; Toshimitsu, Masaaki

光還元により模擬放射性廃液から白金族元素等有用金属を回収する実験を行いその回収特性を調べた。10成分の元素(Ru, Rh, Pd, Mo, Zr, Ba, Sr, Cs, Na)を3モル硝酸に溶解して模擬液を調製した。酸化チタン光触媒を含む模擬液ではパラジウムが選択的に回収でき、他の元素は回収されないことがわかった。回収効率は酸化チタンの濃度の増加に伴って上昇し、酸化チタン濃度2g/l以上でパラジウムの回収率が99%となることが示された。

The recovery characteristics of useful elements such as platinum group metals from a simulated radioactive solution by photo-reduction using an UV-vis light were experimentally examined. A 10-components simulated solution was prepared by dissolving known amounts of metallic compounds (Ru, Rh, Pd, Mo, Zr, Ba, Sr, Cs, Nd) and sodium in nitric acid of 3 mol/l. The metallic palladium was selectively recovered from the simulated solution containing TiO$$_{2}$$-photocatalyst, while other elements mainly remained in solution. The recovery efficiency of Pd increased with the increase of the TiO$$_{2}$$ concentration and was more than 99% at a TiO$$_{2}$$ concentration above 2 g/l.

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