Abstract
A new method was studied for extracting manganese from low-grade pyrolusite with H2SO4 roasting and subsequent water leaching. The mechanism of roasting and optimal conditions for roasting, including the amounts of H2SO4 and H2O addition and the roasting temperature and time, were discussed. The results indicated that the pyrolusite roasting process in the temperature range of 400–600°C was controlled by internal diffusion. The apparent activation energies in the time ranges of 0–30 min and 60–240 min were 25.26 kJ/mol and 14.94 kJ/mol, respectively. The maximum extraction of Mn reached approximately 98%, and the minimum extraction of Fe was approximately 1% under the optimal conditions. The ferric ion concentration was below 0.05 g/L in the leaching solution; thus, Mn was effectively separated from Fe and Si.
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