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Journal of thermal analysis

, Volume 46, Issue 5, pp 1421–1435 | Cite as

Combined thermal and structural study of some egyptian bentonitic clays

  • A. M. El-Shabiny
  • S. M. Hammad
  • I. A. Ibrahim
  • A. K. Ismail
Article

Abstract

Egyptian bentonitic clays from Qasr El-Sagha, Wadi El-Rayan, Kom Oshim and the Cairo — Alexandria desert road were studied thermally (TG, DTG and DTA) and structurally (XRD and IR). The clay fraction consisted mainly of montmorillonite, kaolinite and some illite. Gypsum, quartz and calcite were also identified. It was found that the Na-to Ca-montmorillonite ratio increases in the following sequence: Qasr El-Sagha<Wadi El-Rayan<Kom Oshim<Cairo-Alexandria desert road. There is a marked concentration of gypsum, the highest amount occurring in the bentonite from Qasr El-Sagha, and the least in that from the Cairo — Alexandria desert road. Calcite was mainly found in Kom Oshim, with a very small amount from the Cairo — Alexandria desert road. Magnesium is more abundant than iron in the octahedral layer and increases in the following sequence: Cairo — Alexandria desert road<Kom Oshim<Wadi El-Rayan<Qasr El-Sagha.

Keywords

bentonitic clay IR spectroscopy thermal analyses X-ray diffraction 

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Copyright information

© Akadémiai Kiadó 1996

Authors and Affiliations

  • A. M. El-Shabiny
    • 1
  • S. M. Hammad
    • 1
  • I. A. Ibrahim
    • 1
    • 2
  • A. K. Ismail
    • 1
    • 2
  1. 1.Physics DepartmentNational Research CentreDokki, CairoEgypt
  2. 2.CMRDI, El-TebbinHelwan, CairoEgypt

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