METHOD FOR PRODUCING HIGH-PURITY MANGANESE SULFATE MONOHYDRATE AND HIGH-PURITY MANGANESE SULFATE MONOHYDRATE PRODUCED BY THE METHOD

摘要

The present invention relates to a method for producing high-purity manganese sulfate monohydrate from a low-grade composition, and to high-purity manganese sulfate monohydrate produced by the method. A production method according to the present invention comprises the steps of: acquiring a primary leached manganese solution by adding sulfuric acid (H₂SO₄) and a reductant to a low-grade manganese-containing composition and leaching manganese therefrom; acquiring a secondary leached manganese solution from which primary impurities have been eliminated by adding calcium hydroxide (Ca(OH)₂) to the primary leached manganese solution; acquiring a tertiary leached manganese solution from which secondary impurities have been eliminated by adding sulfides to the secondary leached manganese solution; acquiring manganese oxide from precipitating manganese by using sodium hydroxide (NaOH) in the tertiary leached manganese solution so as to control the pH thereof; adding sulfuric acid to the manganese oxide and redissolving; and drying the redissolved manganese oxide and acquiring high-purity manganese sulfate monohydrate (MnSO₄·H₂0). Thus the present invention allows production of high-purity manganese sulfate monohydrate from a low-grade manganese-containing composition, for use as material for a secondary battery.