An experiment was conducted on an electrolyte for an aqueous zinc-based rechargeable battery containing calcium silicate hydrate (C–S–H). Conventionally, the zinc-based rechargeable battery has a problem that the cycle life characteristic is poor due to the dendrite generated during charging and discharging. This is because the amount of zincate-ion eluted in the electrolytic solution is unstable, and the electrode reaction during charging and discharging is irreversible. The purpose of this study is to utilize the zinc absorption and release abilities of C–S–H to balance the amount of zinc ions in the electrolyte and carry out a uniform dissolution-precipitation reaction. C–S–H showed a Langmuir type in a zinc sulfate solution when adsorbing zinc, and an equal amount of calcium was released at the same time as zinc adsorption. As a result of performing a cycle test with the prepared Zn/Mn battery, the characteristics were improved by interposing C–S–H on the surface of the zinc anode.

　This paper reports effect of addition of iron powder or iron oxides on decarbonation of limestone at 900℃ under reduced pressure. Calcium oxide was obtained by heating limestone with iron oxides at 900℃ under reduced pressure. At normal pressure, calcium oxide was obtained by heating limestone at 900℃ for 225 min. However, at reduced pressure, it was obtained in 130 min. Calcination under reduced pressure was effective in obtaining calcium oxide at low energy. In addition, iron powder or iron oxides was added to the limestone surface for quick calcination. As the results, decarbonation time of limestone was 85 min with the addition of 3 mass% Fe₂O₃, The addition of 2% iron powder shortened the calcination time to 80 min. At normal pressure, no effect of iron powder addition was observed.

　The formation behavior of AlN whiskers during the reaction of Al powder with N₂ was investigated in the temperature range from 1300 to 1650℃. At 1300℃, molten Al remained at the bottom of the crucible. AlN whiskers began to form on the surface of the reaction product above 1500℃, and their amount increased with increasing temperature. The generated AlN whiskers displayed distinct morphologies at each temperature. These morphological changes could be explained by changes in the degree of supersaturation during growth.