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

Abstract

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.

Description

technical field [0001] The invention relates to the field of manganese hydrometallurgy, more specifically, a smelting method for producing manganese sulfate by reducing pyrolusite with pyrite under pressure. Background technique [0002] The traditional process of producing manganese sulfate from pyrolusite is reduction roasting and sulfuric acid leaching. The process of this method has a history of several decades, and the process is mature. It has been the main method of manganese sulfate production for a long time. However, due to material drying, fine grinding, reduction roasting, etc., this process results in high energy consumption, high labor intensity for workers, and high-temperature operations; at the same time, dust and smoke will be generated to pollute the environment, and the production cost is high. , the economic benefits are low. At present, the direct reduction leaching process of pyrolusite has been applied in industrial production. This method is an ide...

AI Technical Summary

Problems solved by technology

However, the direct reduction and leaching of pyrolusite has the following disadvantages: under normal pressure, the reaction temperature is not high, and the maximum temperature is only about 90°C, so the reaction intensity is weak, the reaction time is long, and the manganese leaching rate is not high, only 75-85%. The manganese content in the slag is about 5%, which leads to the loss of manganese; the direct reduction process is not very adaptable to the raw materials, and the leaching effect on the lower grade pyrolusite is not good