Abstract
A kinetic study of the leaching of powdered ilmenite ore by hydrochloric acid has been investigated. The effects of (a) stirring speed ranging from 100 to 500 min −1, (b) particle size ranging from 20 to 74 μm, (c) acid concentration ranging from 7.2 to 9.6 M and (d) temperature ranging from 70 to 90°C on titanium and iron dissolution are reported. The dissolution rates are significantly influenced by the temperature and concentration of the acid solutions. The experimental data for the dissolution rates of titanium and iron have been analyzed with the shrinking-core model for reaction control. The observed effects of the relevant operating variables on the dissolution rates are consistent with a kinetic model for diffusion control. The apparent activation energy for the dissolution of titanium and iron has been evaluated using the Arrhenius expression.
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