[1I01-05] Waste Management 1

[1I05] G_H2 from inorganic hydrates and hydroxides

Effect of physisorbed water and transition metal ions

*Jun Kumagai¹, Katsuyoshi Horinouchi², Kumi Negishi³, Masaya Ida³ (1. Institute of Materials and Systems for Sustainability, Nagoya University, 2. Graduate School of Engineering, Nagoya University, 3. Taiheiyo Consultant Co. LTD)

Keywords:cement solidification, low-level radioactive waste, inorganic hydrates, inorganic hydroxides, transition metal ions

Several inorganic hydrates and hydroxides were gamma-ray irradiated to determine G_H2 for safe cement solidification with low level nuclear waste. Although most of hydrates show lower G_H2 with large amount of hydrated water molecules than that of small amount ones, FeSO₄•nH₂O are out of the rule.

Physisorbed water enhanced almost twice for G_H2 of several hydroxides. Removal of physisorbed and free waters may be important for the cement solidification. Effect of transition metal ions for G_H2 should be reported on the lecture.