Exchangeable Cation Composition of Yamagata Montmorillonite

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  • 山形産モンモリロナイトの交換性陽イオン組成
  • ヤマガタサン モンモリロナイト ノ コウカンセイ ヨウイオン ソセイ

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Abstract

Aside from a clay mineralogical interest, it is also important in industrial usage to understand the nature of the exchangeable cation in montmorillonite. A montmorillonite sample obtained from the bentonite deposit of the Tsukinuno mine in Yamagata prefecture was treated repeatedly with either 70% 2-propanol solution, Na-exchanged or dialyzed. Changes were monitored in the montmorillonite after treatment which includes CEC, LC (i.e. cation leaching by NH4-Ac), XRD and TG-DTA analysis. Results show that approximately 95% of the exchangeable cations in the Yamagata montmorillonite is Na+ ion. This suggests that the montmorillonite sample is an almost pure Namontmorillonite, and consequently, Yamagata bentonite which composed mainly of Yamagata montmorillonite is an almost pure Na-bentonite.

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