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Kinetic evaluation of aqueous dissolution of P0798 simulated HLW glass as a function of dissolved silica concentration by using micro-channel flow-through test method

マイクロチャンネル流水試験法を用いた模擬ガラス固化体P0798溶解挙動の溶存ケイ酸濃度依存性評価

稲垣 八穂広*; 酒谷 圭一*; 三ツ井 誠一郎  ; 出光 一哉*; 有馬 立身*; 野下 健司*

Inagaki, Yaohiro*; Sakatani, Keiichi*; Mitsui, Seiichiro; Idemitsu, Kazuya*; Arima, Tatsumi*; Noshita, Kenji*

地層処分における高レベル廃棄物ガラスの長期挙動のモデル化にあたっては、溶存ケイ酸濃度が飽和に近い条件でのガラス溶解機構の整合的な評価が必要である。評価においては、pH,溶液組成,反応表面積といった多様なパラメタをコントロールした条件で実験を行い、信頼性が高く、正確なデータを得る必要がある。そこで本研究では、我が国の模擬ガラス固化体(P0798)について、マイクロチャンネル流水試験法を用い、幾つかのpH条件で溶存ケイ酸濃度を関数とした溶解試験を行った。その結果、溶存ケイ酸濃度が飽和に近い条件においてもある程度の速度でガラスマトリクスが溶解すること、アルカリ元素のイオン交換だけでなく、アルミニウムもガラス溶解において重要な役割を持つことがわかった。

Modeling long-term dissolution of HLW glass in geological disposal needs a consistent evaluation of glass dissolution kinetics under conditions of near silica-saturation. The evaluation of the kinetics also needs reliable and precise data obtained under well-constrained experimental conditions for multiple parameters such as pH, solution concentrations of elements and reactive glass surface area. In the present study, therefore, aqueous dissolution tests were performed for a Japanese type of simulated HLW glass, P0798, by using "Micro-channel flow-through test method" as a function of dissolved silica concentration at several constant pHs. The test results showed that the glass matrix dissolution proceeds at certain rates even under conditions of near silica-saturation, and behavior of aluminum can play an important role in the glass dissolution as well as ion-exchange of alkaline elements.

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