Volume 6, Issue 1 (4-1998)                   www.ijcm.ir 1998, 6(1): 53-66 | Back to browse issues page

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Bentonites from Kashmar, Gonabad and Ferdows
were studied and compared with imported types. Bentonites
have a very wide range of industrial uses. Chemical and
mineralogica l composit ion of montmo rillo nite wit hin t he
bentonite control its kind of application. Bentonites from
Kashmar have the higbest content of Cao and A120) and K20.
High expandibiity, good adhesive property a nd having high
content of Na20 indicate that Ferdows bentonites are Na-type.
Gonabad bentonites are Na-Ca-Type. Kashmar, Ferdows and
Gonabad bentonites were treated for acti vat io n. In term of
exc hangable ca t io ns, Kashmar bent o nite is compa rable with
imported activated be ntonites from China a nd Turkey .
Detemination of Ca and Na montmorionite based on the X-Ray
pattern is not very e asy. The position of the first peak of
montmorillonite we re compared with Na20 content of
bentonites. JJ the first peak of montmorillonite is more than 7.3
degree and t he Na20 co nte nt of bentonite is more than 2
percent, therefore montmorillonite is Na-type. If the first peak is
less than 7 degree and Na20 content of bentonite is less than 1.5
percent, the montmorillonite is Ca-type.

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