The invention discloses a method for preparing a
manganese sulfate solution through
manganese oxidized ore thermal-storage reducing
roasting. Preparation is performed according to the following stepsthat (1)
manganese oxidized ore is crushed,
biomass powder is added, mixing and uniform stirring are performed, then a mixture is spread into a
roasting box with ventilation holes in the bottom, the material layer is combusted from the
surface layer to the bottom layer under the negative micro-pressure air draft, the
combustion layer moves to the bottom of the material layer, and then the roastingprocess is finished, so that thermal reducing-roasted ore is obtained; and (2) water, dilute sulphuric acid or electrolytic manganese anolyte are added into a leaching
barrel, the thermal reducing-roasted ore is added into the
barrel, stirring is performed so that pulp liquid is prepared, then
sulfuric acid is added into the pulp liquid, stirring and reaction are performed, then
hydrogen peroxideis added, stirring and reaction continue, then a manganese
sulfate acid leaching solution is obtained, the acid leaching solution is subjected to
neutralization,
iron removal and purification, and then the manganese
sulfate solution is obtained. The method has the characteristics that the source of reducing agents is wide, the price of the reducing agents is low, the reducing speed is high, the equipment investment is low,
energy consumption is low, the manganese reducing
leaching rate is high, and the scale is flexible, and the defects in the prior art can be overcome.