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Pure Appl. Chem., 2001, Vol. 73, No. 5, pp. 761-770

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, NaCl­MgCl2­H2O, KCl­MgCl2­H2O, and to NaCl­Na2SO4­H2 O, KCl­K2SO4­H2 O, Na2SO4­K2SO 4­H2O. The coherence between the calculated and the experimental diagrams is discussed.