1999 Volume 38 Issue 4 Pages 246-254
Saponite was hydrothermally synthesized from rock powder or sand sludge with Mg (OH) 2. The materials treated with HCl solution were also used as starting materials. The hydrothermal products were characterized by means of XRD, XRF, DTA-TG, IR and SEM. Saponite could be obtained from all starting materials with 2.0 mol/l-NaOH solution. In the case of distilled water or 0.2 mol/l-NaOH solution, broad peaks of saponite were observed. Analcime was once formed and then vanished within the first 8h of reaction period, from the HCl-treated starting materials. Then, saponite was formed. Amphibole, muscovite, and chlorite in the starting materials remained after the hydrothermal reaction.
