白土(南九州産)のアルカリ水熱処理

概要

論文の詳細を見る
The kinetics of formation of hydroxysodalite from allophane (volcanic ash in south Kyushu, Japan) by treating hydrothermally with alkaline solutioon were investigated by X-ray diffractiometry. The kinetic equation of hydroxysodalite formation is expressed as a first order reaction and the activatin energy is estimated as 18 kcal/mol. It is suggested that the mechanism of formation of hydroxysodalite is different from that of zeolite species P. Under the condition of 3N-NaOH at 90℃, zeolite species F and P are formed by addition of 2M-NaCl. They appear at the earier period of the treatment and then change into sodalite. The condition of formation of zeolite species F is delicate, because the zeolite changes easily into sodalite and the induction period of formation of the zeolite is longer than that of sodalite.
近畿大学の論文
1976-12-01