Analytical study of the variation of physico-chemical and structural properties of a Kieselgühr during its decarbonationB. Hamdi1, Z. Kessaïssia1, J.B. Donnet1 and T.K. Wang2
1 U.S.T.H.B., Institut de Chimie, BP. 32 Bab Ezzouar, 16111 Alger, Algérie
2 Laboratoire de Chimie Physique, École Nationale Supérieure de Chimie de Mulhouse, 3 rue Alfred Wener, F-68093 Mulhouse Cedex, France
The physico-chemical properties and the structure/texture of a Kieselgühr, of Algerian origin, have been investigated in this study by using several analytical techniques (atomic absorption spectroscopy, IR, XRD, gas adsorption, porosimetry and microscopies). The results show that the natural product is contaminated heavily by calcium carbonate. Nevertheless, it presents an interesting porosity. After decarbonation by HCl acid and thermal (1 000 °C) treatments, we obtained the Kieselgühr with pure silica phase and well developed porosity. The treated product could be very interesting for filtration and clarification applications.
Key words: Kieselgühr analysis / treatment / texture / structure / surface.
© EDP Sciences, Wiley-VCH 1998