Method for producing manganese sulfate by acid leaching under pressure of pyrolusite and pyrite

The invention discloses a method for producing manganese sulfate from the acid leaching of pyrolusite and pyrite under pressure, which includes the following steps: (1) after the pyrolusite and pyrite are mixed according to the proportions of 1:0.3 to 0.5 based on the mass ratio of the pyrolusite and pyrite, sulfate with the acidity of 100 to 220g/l is adopted for size mixing; (2) after the size mixing is finished, the materials are added into an autoclave, and the pressure in the autoclave is controlled from 0.3 to 1.0MPa, and the temperature is controlled from 100 to 110 DEG C for the manganese leaching reaction under pressure; after the time of reaction is for 60 to 180 minutes, the slag is discharged and the slag liquid is separated. The method can leach the manganese in the pyrolusite within a short time with different acidities under certain pressure and higher temperature and the leaching rate of the manganese is about 95 percent and the content of manganese in the slag is less than 1.5 percent.