Synthesis ofHeatResistance Wall Material fconi Sliirasu in the Kagoshima Prefecture

Shirasu，一个火山灰分布在日本九州南部很大程度上。Shirasu中SiO_2/Al_2O_3摩尔比（SiO_2 ：72.20%， Al_2O_3 ： 12.41， K_2O ： 3.44， CaO ： 1.29）和11-钼（10 CaO·Al_2O_3·10 SiOa·10H_2O）的耐热能力大致相等。11-Tobermorite是由两种方法合成的。使用alkali （KOH）的第一种方法。第二种方法是免费的，第一种方法：11-Tobermorite在一个自动迷宫中经过两步的水热反应合成自Shirasu。在第一步，材料混合在合适的数量（CaO/SiO_2=1.0， K_2O/SiO_2=0.32），并在60℃的汽车加工5小时。在下一步，11 - 11-tobermorite在温度升高到150 ° C的情况下被发现。在Shirasu的第一步中， Si-O的想法是用alkali和Ca吸收分解，然后再用11-tobermorite核试验场分解。但在60 ° C以上的条件下，5小时，碱性分解钙和11-tobermorite核。在下一步，11-tobermorite和水晶种子直接生长，但第二种无碱性材料的方法只有shirasu、Ca（OH）2和水。兰格反应时间是必要的，与alkali的方法相比较，但治疗方法是不必要的。

The Shirasu, a volcanic ash is distributed widely in southern Kyushu, Japan. The SiO_2/Al_2O_3 mole ratio in shirasu (SiO_2 : 72.20 %, Al_2O_3 : 12.41, K_2O : 3.44, CaO : 1.29) and 11-tobermorite(10CaO・Al_2O_3・10SiOa・10H_2O) with heat-resistance are almost equal. 11-Tobermorite was synthesized from shirasu by the two methods.1. The first method with alkali (KOH).2. The Second method by alkali-freeBy the first method : 11-Tobermorite was synthesized from shirasu by two steps hydrothermal reaction in an autoclave. At the first step, the materials were mixed at suitable amount (CaO/SiO_2=1.0, K_2O/SiO_2=0.32), and is pretreated in the autoclave at 60℃ for 5 hours to prereact. At the next step, 11-tobermorite was obtained by the way of increasing temperature to 150℃. In the first step, Si-O in shirasu is thought to be decomposed with alkali, and Ca adsorbed, and then 11-tobermorite nucleation place. But under condition of above 60℃ for 5 hours, alkali dissolved Ca and 11-tobermorite nuclea. In the next step, 11-tobermorite, crystal seed grows immediately.But the second method of alkali-free the materials are only shirasu, Ca(OH)_2, and water. The langer reaction time was necessary in compared with method by alkali, but the pretreatment was not necessary.