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都市ゴミ焼却飛灰の人工岩石に及ぼすTiO$$_{2}$$とNa$$_{2}$$O添加剤の影響

Influence of TiO$$_{2}$$ and Na$$_{2}$$O additives on properties synthetic rock of fly ash from municipal waste incinerator

三田村 久吉; 馬場 恒孝; 前田 敏克

Mitamura, Hisayoshi; Bamba, Tsunetaka; Maeda, Toshikatsu

都市ゴミ焼却飛灰の無害化・安定化のために開発された人工岩石に及ぼす添加剤とホットプレス温度の影響を調べた。1200$$^{circ}$$C,16時間の常圧焼結試験により、緻密な固化体作製には20wt%のTiO$$_{2}$$と1.5wt%のNa$$_{2}$$Oの添加が必要不可欠であることがわかった。X線回折測定より、これらの添加剤が、Perovskite(CaTiO$$_{3}$$)とGehlenite(Ca$$_{2}$$Al$$_{2}$$SiO$$_{7}$$)の生成を促進することがわかった。一方、ホットプレスによる人工岩石のかさ密度は、1000~1100$$^{circ}$$Cの間で急激に増加し、開気孔率は1050~1150$$^{circ}$$Cの間で急激に減少していた。これより、実用的なホットプレス温度として1100~1150$$^{circ}$$Cが妥当であると考えられる。

Influence of additives and hot-pressing temperature on properties of the synthetic rock was investigated, which was developed for making harmless and stabilizing fly ash from municipal waste incinerator. Sintering test at 1200$$^{circ}$$C for 16 h revealed that addition of 20 and 1.5 wt% of TiO$$_{2}$$ and Na$$_{2}$$O, respectively, is necessary for preparation of dense products. X-ray diffractometry showed that these additives promoted the formation of perovskite (CaTiO$$_{3}$$) and gehlenite (Ca$$_{2}$$Al$$_{2}$$SiO$$_{7}$$) minerals. During hot pressing, bulk density of the synthetic rock increased steeply with temperature between 1000 and 1100$$^{circ}$$C. On the other hand, its open porosity decreased rapidly with temperature between 1050 and 1150$$^{circ}$$C. These facts imply that the temperature of 1100$~{}1$150$$^{circ}$$C is practical in hot pressing of fly ash.

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パーセンタイル:77.52

分野:Materials Science, Ceramics

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