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


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.


bentonitic clay IR spectroscopy thermal analyses X-ray diffraction 


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  1. 1.
    G. W. Brindley, ‘Crystal Structure of Clay Minerals and their X-ray Identification’, ed. G. W. Brindley and G. Brown, Mineralogical Soc., London, No. 5, 1980, p. 170.Google Scholar
  2. 2.
    D. Plee, L. Gatineau and J. J. Fripiat, Clays and Clay Minerals, 35 (1987) 81.Google Scholar
  3. 3.
    E. F. Koeble: ‘Handbook of X-rays’, Mcgraw-Hill Book Company, London 1967.Google Scholar
  4. 4.
    G. Brown and G. W. Brindley, Ref. [1]‘, p. 305.Google Scholar
  5. 5.
    D. M. Moore and R. C. Reynolds, Jr., ‘X-ray Diffraction and the Identification and Analysis of Clay Minerals’, Oxford Univ. Press. Oxford, New York 1989.Google Scholar
  6. 6.
    R. C. Reynolds, Jr., Ref. [1]‘, p. 249.Google Scholar
  7. 7.
    C. M. Bethke and R. C. Reynolds, Jr., Clays and Clay Minerals, 34 (1989) 224.Google Scholar
  8. 8.
    M. Fields, I. K. Walker and P. P. Williamy, J. Sci. Tech., (1956) 38.Google Scholar
  9. 9.
    H. Hayaski and K. Oinuma, Am. Mineral. 50 (1965) 476.Google Scholar
  10. 10.
    J. M. Sterratosa, Am. Mineral, 45 (1960) 1101.Google Scholar
  11. 11.
    R. W. Grimshow, B. Heaton and E. L. Roberts, Trans. Brit. Cer. Soc., 44 (1945) 69.Google Scholar
  12. 12.
    R. C. Mackenzie, G. F. Walker and R. Hart, Mineral. Mag., 28 (1949) 704.Google Scholar
  13. 13.
    R. C. Mackenzie, ‘Some Advanced Topics in Clay Mineralogy and in Differential Thermal Analysis’, Soil Sci. Dep., Fac. Agr., Cairo University, 1967.Google Scholar

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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