| Abstract: | Reactions of Sodium Silicate with Kaolin under Various Hydrothermal Conditions The reactions of sodium silicate (molar ratio SiO2/Na2O 3.8) with kaolin were investigated under various conditions of hydrothermal treatment in saturated water vapours in an autoclave. The products of reaction were identified by X-ray, electron-microscopic, and infrared methods. The results have shown that, under autoclave conditions, sodium silicate reacts with kaolin to alumosilicagel or to a crystallized zeolite mineral analcime Na2O · Al2O3 · 4 SiO2 · 2 H2O. At the reaction kaolin dissolves and α-quartz simultaneously appears in the product of reaction. |
