Abstract
The formation process of kaolinite in the hydrothermal reaction of an amorphous calcium silicate with aluminum chloride was studied by XRD, IR, DTA-TG, TEM, and high-resolution solid state 29 Si-MAS/NMR. The amorphous calcium silicate prepared from diatomite and calcium hydroxide was hydrothermally treated with an aluminum chloride solution in a Teflon pressure vessel at 220°C for a reaction period varying from 1 to 144 h. As the first step of the reaction, the Q 2 state component of the starting material changed into an intermediate amorphous with the Q 3 state. The degree of silica-polycondensation of this state is identical to that of the intermedicate phased observed in the kaolinitization from the amorphous mixture of silica and alumina
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