Method for producing electrolytic manganese dioxide from manganese gangue and titanium dioxide waste sulfuric acid

The invention discloses a method for producing electrolytic manganese dioxide from manganese gangue and titanium dioxide waste sulfuric acid. The method particularly includes carrying out reduction leaching and fine grinding on the manganese gangue by the aid of the titanium dioxide waste sulfuric acid; carrying out solid-liquid separation to obtain a white filter residue used as diatomaceous earth; extracting leach liquid by di-(2-ethylhexyl)phosphate extraction agents; carrying out saponification by light burning powder (or magnesium oxide); removing impurities and then carrying out electrolysis to obtain the electrolytic manganese dioxide, iron black and magnesium sulfate. The iron black and the magnesium sulfate are byproducts. The method has the advantages that the manganese gangue and titanium dioxide waste acid can be synergistically disposed by the aid of the method, accordingly, the problems in the aspect of ecological safety due to manganese gangue accumulation can be solvedby the aid of the method,