Abstract
A laboratory-scale acid process to produce alumina with a purity higher than 98.4% from the northeastern red soils of Argentina is proposed. Leaching was carried out with 6 M hydrochloric acid at several molar ratios both with and without previous thermal treatment of the mineral. The relationship between the extent of dissolution of iron (II), iron (III), aluminium (III) and titanium (IV) and the structure of the principal minerals of the soils were analyzed. The solutions obtained after leaching, containing about 30 g/l of aluminium and iron oxides and 1 g/l of titanium oxide, were purified by solvent extraction and hydrolytic precipitation. The related behavior of the system aluminium (III) - iron (III) in hydrochloric acid with the organic solvent tributyl phosphate and the conditions suitable for titanium hydrolysis were studied. Then, hydrated aluminium chloride was obtained by crystallization and thermal decomposition of the salt was carried out to produce alumina.
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