ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 17, Number 1
JKCSEZ 17(1)
February 20, 1973 

Korean bentonite was treated with aqueous NaOH solution under the reaction conditions such as concentration of NaOH, 0.5-6 N; ratio of Na2O to SiO2, 1-4; reaction time, 2-30 days; reaction temperature, 70℃-90℃. The products were examined by X-ray diffraction patterns. When it was treated with 2 N NaOH at 70℃, zeolite species P1 was formed with good yield. In higher concentration and at higher temperature than above, zeolite species P1 was converted to hydroxysodalite. Together with these crystals, some faujasite type zeolite, sodium A zeolite, mordenite type zeolite etc. was formed depending upon reaction conditions.