| Preparation of Na-A Zeolite From Clay |
P. c. BORTHAKUR, A. A. NAQVI, G. c. BHATTACHARYA,
s. N. DUTTA AND M. s. IYENGAR
Pages : 100-107
DOI : 10.1080/0371750X.1979.10840898 |
| Abstract |
| The formation of Na-A zeolite from a locally available
kaolinitic lithomargic clay was investigated. Influence of
several factors, e.g. temperature during heat treatment of
clay prior to reaction with caustic soda solution, SiO./ Al20 3
ratio of clay, concentration of the alkali, reaction .period,
temperature and pressure during reaction and crystallization
on the nature of products formed was examined.
Depending on Na20/H20 ratio, time and temperature of
reaction and crystallization, either zeolite Na-A or the
felspathoid hydroxysodalite was formed as the single crystalline
phase from the heat activated lithomargic clay. The
cubic form of zeolite-P was obtained in small amount in
association with either zeolite Na-A or hydroxysodalite.
Zeolite Na-X formed, as an exception under a particular
condition. The nature and extent of zeolite formation do
not depend upon the ratio of Si02 and Al20 3 in the clay
but on the extent of their solubility in alkali. |
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