Abstract
The Holocene lacustrine diatomaceous earth of Fayium, South West of Cairo, has been studied to define its minerals, chemistry, petrography and physical properties. Minerals were processed by way of calcination at 550°C, followed by acid leaching to reduce levels of mineral impurities. The diatomite is of biogenic opal A, with calcite as the main gangue mineral, quartz and clay minerals (smectite followed by kaolinite in abundance and a trace amount of illite). Silica in the diatomaceous earth accounts for about 63% on average.
Positive correlation between CaO and CO2 indicates that Ca is present mainly as calcite. Al2O3, Fe2O3, MgO and K2O are attributed mainly to clay minerals. However, the physical properties of the diatomaceous earth as filter-aids and filler for paints and plastics are poor because of general high levels of impurities. The technological performances of the diatomaceous earth have been significantly improved owing to upgrading of diatoms through mineral processing trials.
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References
Abdel Aleem, A., 1958a, A taxonomic and paleoecological investigation of the diatomite flora of the extinct Fayium Lake, Upper Egypt, part 1: systematic part: Bull. Fac. Sci., Alex. Univ., Egypt, p.99–137.
AbdelAleem, A., 1958b, A taxonomic and paleoecological investigation of the diatomite flora of the extinct Fayium Lake, Upper Egypt, part II: distribution and ecology: Bull. Fac. Sci., Alex. Univ., Egypt, v. 2, p.217–244.
Basta, E.Z., 1972, Geology and mineralogy of diatomitic clay deposits north of Fayium, Egypt: Bull. Fac. Sci., Cairo-Univ., v.45, p.319–329.
BS1795, 1976, British Standards specification for paints Brit., standard Inst. Publ., in Diatomite technical report WG/92/39 British Geol. Survey, 37p.
Faris, M. I. and G. F. Girgis, 1969, Studies and investigation on diatomaceous earth deposits in Fayium depression: Proc. 6th Arab Sci., Congress, v.4B, p.751–767.
Inglethorpe, S.D.Y., 1992, Diatomite technical report WG/92/39: Brit. Geol. Surv., 37p.
Jeffé D., 1969, The effect of heat treatment on the reactivity of minerals: Leeds, Univ., Ph.D. Thesis, 215p.
Loukina, S. M., M.A. EL-Hefnawi, and S.D. Abayzeed, 1994, Mineralogy and geochemistry of diatomaceous earth from Fayium region, 1st International Symposium on Indst. Appl.: Min. Soc. of Egypt, p. 282–305.
Reed, R. J. R. and M.A. Picksley, 1987, The determination of the “true” filtration characteristics of diatomaceous earth: J. Ameri. Soc. Brewing Chemists, v.45, n.2, p.48–53.
Remmers, T.E. and M.A. Krannich, 1986, Pigment handbook, in P.A. Lewis, ed., V. 1 Properties and Economics (2nd ed.): John Wiley and Sons, p. 125–137.
Said, R., 1972, A preliminary report on the Holocene geology and archeology of northern Fayium, in cc Reevs, ed., “Playa Lake Symp. Teras” Center Arid and Arid land studies: Lubback, Publ., v.4, p.41–61.
Swedan, H.A., 1922, Stratigraphy of the Eocene sediments in the Fayium area: Ann. Geol. Surv., Egypt, v. 22, p. 157–166.
Tada, R. and Iijma, 1983, Petrology and diagenetic changes of Neogene siliceous rocks in northern Japan: Jour. Sedim. Petrology, v.53, p. 911–930.
Theune, C. and J. Bellet, 1988, Aptitude of diatomaceous ore for filter aid processing: Proc. 8th Ind. Min. Conf., p. 223–229.
Wilson, M. J., 1989, A handbook of determination methods in clay mineralogy: Chapman and Hall, New York, 308p.
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Hassan, M.S., Ibrahim, I.A. & Ismael, I.S. Diatomaceous deposits of Fayium, Egypt; characterization and evaluation for industrial application. Chin. J. Geochem. 18, 233–241 (1999). https://doi.org/10.1007/BF02831069
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DOI: https://doi.org/10.1007/BF02831069