ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Optimal conditions for hydrothermal synthesis of saponite

Ľ. Kuchta and V. Š. Fajnor

Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, CS-842 15 Bratislava

Abstract: The products of hydrothermal syntheses in the system of oxides Si0₂—Al₂0₃—MgO(MgO—CaO—Na₂0)—H₂0 in mass amounts 4.4:0.2:3.6:0.2 were studied. Syntheses were performed at temperatures 373,423,473, 573, and 608 К during 7,14, and 21 days. As starting materials amorphous silica with aluminium, magnesium and/or calcium or sodium hydroxides were used. The aim of the study was to find optimal conditions of the synthesis (temperature, pressure, and duration). It was revealed that the temperature 608 K, pressure 13.3 MPa and duration of synthesis 7 days are suitable for formation of the saponite. A badly crystallized saponite is formed even at 373 К and atmospheric pressure.

Full paper in Portable Document Format: 423a339.pdf

Chemical Papers 42 (3) 339–345 (1988)