A manganese carbonate ore has been mechanically activated at different
milling times and the effect of mechanical activation on the ore
structure is analyzed by X-ray diffraction, scanning electron microscopy
and particle size analysis. The activation procedure leads to
amorphisation and structural disordering of the ore structure. Sulfuric
acid leaching of the non-activated and activated manganese carbonate ore
has been studied at different temperatures, durations, and acid
concentrations. The results show that dissolution of manganese increases
from 69\% to 100\% in acidic leaching with 1 M H2SO4 at 70 degrees C
after 30 min of mechanical activation, due to amorphisation in structure
and creating more surface area
