Process for producing solid manganese dioxide

摘要

A process for producing manganese dioxide comprising the steps of: (1) reacting manganese oxide with a molar excess of an aqueous chloric acid solution in a reaction zone to form a reaction mixture in said zone comprising chlorine gas, a solid phase containing manganese dioxide, and a liquid phase containing chloric acid and water; the concentration of chloric acid in said liquid phase is greater than about 5% by weight of said liquid phase upon leaving the reaction zone; (2) separating said chlorine gas from said solid phase and said liquid phase; (3) separating said solid phase containing manganese dioxide from liquid phase containing chloric acid and water; (4) removing water from said separated liquid phase to concentrate said chloric acid in said separated liquid phase; and (5) returning said separated and concentrated liquid phase back to said reaction zone for further reaction with manganese oxide.