The invention discloses a method for preparing battery-grade
manganese sulfate by using a
copper chloride manganese liquid. The method comprises the steps that the
copper chloride manganese liquid reacts with concentrated
sulfuric acid to synthesize a coarse manganese
sulfate crystal after neutralizing and precipitating
copper ions through manganese
carbonate, precipitating heavy
metal ions through
manganese sulfide, preliminarily precipitating
calcium ions through manganese
sulfate and deeply precipitating
calcium ions through active manganese
fluoride in sequence; and the coarse manganese sulfate
crystal is recrystallized to obtain a battery-grade manganese sulfate
crystal. The method for preparing the battery-grade manganese sulfate by using the
copper chloride manganese liquid has theadvantages that the whole process adopts manganese-containing materials to remove and recover cuprum,
zinc,
calcium and other components in the
copper chloride manganese liquid, and a five-stage countercurrent series recrystallization purification technology is combined, so that the quality of manganese sulfate is greatly improved, and the high-efficiency utilization of manganese resources and thewhole-process no-waste-
water discharge are ensured; concentrated
sulfuric acid is directly adopted to achieve the
precipitation and conversion of manganese
chloride to synthesize the coarse manganesesulfate, and the complex process for synthesizing the manganese sulfate by firstly extracting manganese ions then reversely extracting
sulfuric acid or firstly precipitating manganese ions through
carbonate then synthesizing the manganese sulfate through sulfuric
acid dissolution is avoided.