Abstract
The kinetics of leaching laterite with hydrochloric acid has been investigated at dilute solid phase concentrations in a magnetically stirred reactor. The effects of hydrochloric acid concentration and temperature on the dissolution rate of iron are reported. Preroasting of the laterite alters its mineralogical composition and increases its porosity and surface area, thus making it more amenable to leaching. The leaching rates were analyzed with the shrinking core models for reaction control. The leaching data for both raw and roasted laterites fit the diffusion kinetic equation with associated apparent activation energies of 71.7 and 65.2 kJ/mol, respectively.
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