Abstract
Smectite was formed from some clays, such as pyrophyllite, kaolinite, sericite and talc by reaction with NaOH solution at 100°C under atmospheric pressure. Smectite was formed well under the condition that the concentration of NaOH was near 2M-3M. Furthermore, when the reaction time involved is within 50 days, the amount of starting material should be less than 0.5g in 100ml solution to form smectite.
