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Abstract: In order to widen the industrial uses of Douiret sand belonging to the Chenini formation (Southern Tunisia) experimental investigations have been performed to synthesized the silica gel from the natural raw material using alkaline attack, which correspond to the fusion of silica and sodium carbonate together at high temperature (). Mineralogical and physicochemical characterisation of the natural raw material and synthetic silica gel indicate that pure and very fine sized Douiret sand can be yield a very interesting silica gel product characterised by high specific surface which can reach and a great capacity of adsorption. [Copyright &y& Elsevier]