Treatment of Tunisian salt lakes using solubility phase diagrams*
Najia Kbir-Ariguib**, Dalila Ben Hassan Chehimi, and Lotfi Zayani
Institut National de Recherche Scientifique et Technique,
Borg Cedria P.O. Box 95, Hammam-Lif, 2050 Tunisia
Abstract: The Tunisian salt lakes are considered as an important
materials resource useful for industry and agriculture. They are called
sebkhat or chott, and they cover a large part of Tunisian land. Their
brines correspond to the quinary system: Na+, K+,
Mg2+ / Cl, SO42H2O.
In the first part of this paper, a short description and abstracted
geochemical and economical data about some Tunisian salt lakes are given.
In the second part, the fitting equations used for modeling the quinary
system are established and applied to the subsystems NaClKClH2O,
and to NaClNa2SO4H2 O,
KClK2SO4H2 O, Na2SO4K2SO
4H2O. The coherence between the calculated and
the experimental diagrams is discussed.
*Lecture presented at the 9th IUPAC International
Symposium on Solubility Phenomena (9th ISSP), Hammamet, Tunisia, 25
28 July 2000. Other presentations are published
in this issue, pp. 761844.
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