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ガラス固化体の溶解に及ぼすMgイオンの影響

Effects of magnesium ion on dissolution of nuclear waste glass

岩田 孟 ; 関根 伸行*; 三ツ井 誠一郎  

Iwata, Hajime; Sekine, Nobuyuki*; Mitsui, Seiichiro

MgCl$$_{2}$$溶液及び脱イオン水を用い、90$$^{circ}$$C, 大気雰囲気下で、模擬ガラス固化体の静的浸出試験を実施した。その結果、脱イオン水条件では溶解速度が経時的に減少する一般的な傾向を示すのに対し、MgCl$$_{2}$$溶液条件では、長期(91日$$sim$$)の試験期間において溶解速度の増加が観察された。このようなMgCl$$_{2}$$溶液条件溶液条件での特異な溶解挙動は、ガラス表面に析出するMg含有鉱物種の変化に関係している可能性が考えられる。

Static leaching tests of simulated nuclear waste glass were carried out at 90$$^{circ}$$C in an air atmosphere using a MgCl$$_{2}$$ solution and deionized water. As a result, in the MgCl$$_{2}$$ solution, temporal plateau and following resumption of glass dissolution were observed, while an ordinary dissolution behavior, which shows rate decrease with time, was observed in the deionized water. It is considered that these unique dissolution behavior in MgCl$$_{2}$$ solution may be related to the evolution of the Mg-containing mineral species deposited on the glass surface.

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