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カルシウムイオンや金属鉄がガラス固化体の溶解/変質挙動に及ぼす影響

Corrosion behavior of simulated high-level waste glass in the presence of calcium ion or metallic iron

前田 敏克; 渡辺 幸一; 大森 弘幸*; 坂巻 景子; 稲垣 八穂広*; 出光 一哉*

Maeda, Toshikatsu; Watanabe, Koichi; Omori, Hiroyuki*; Sakamaki, Keiko; Inagaki, Yaohiro*; Idemitsu, Kazuya*

地層処分場で使用されるセメント系材料を起因とするCaイオンや鉄製オーバーパックの共存がガラス固化体の溶解挙動に及ぼす影響を調べるため、Caイオンを含む溶液中や鉄が共存する条件下での模擬ガラス固化体の浸出試験を実施した。その結果、Caイオン共存下ではガラス固化体の溶解が抑制され、鉄共存下では溶解が促進されることがわかった。鉄共存下では、鉄ケイ酸塩の生成に伴いガラス固化体の主成分であるシリカが変質することによって、ガラス固化体の溶解が促進される可能性があると推察された。

Static leach tests were conducted for simulated HLW glass in CaCl$$_{2}$$/Ca(OH)$$_{2}$$ solutions to investigate the corrosion behavior of HLW glass under calcium-rich environments induced by cement based materials in geological repositories. Another series of leach tests were conducted in deionized water in the presence of iron to investigate the effects of iron over-pack on the glass corrosion. In Ca solutions, corrosion of the glass was inhibited during the test period compared to that in deionized water, while the corrosion was enhanced at the presence of iron. The enhancement of the glass corrosion was assumed to be accompanied with transformation of silica, a glass network former, into iron silicates.

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