Abstract
The extraction equilibrium of aluminum from hydrochloric acid and sulphuric acid solutions was studied by using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester in DOSB diluent as a function of pH, metal and extractant concentrations. The experimental temperature was 298 K, and the ionic strength of the aqueous solutions was fixed to 3 so as to keep the activity coefficient of the species in the aqueous solutions constant.In both acid solutions, the extraction mechanism was found to be an ion exchange process, and the extracted species were identified as AlR3·2RH monomer. The apparent equilibrium constants for free aluminum ion were calculated to be 10−1.16 and 10−1.06 for hydrochloric acid and sulphuric acid solutions, respectively.
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