Electrolytic MnO2 production method and process flow

The production method of electrolytic manganese dioxide is divided into two types: high temperature method and low temperature method. The main process conditions of the low temperature method are: electrolyte temperature 20~25°C, electrolyte sulfuric acid concentration 120~200g/L, anode current density 500A/m ² , and electrolytically generated manganese dioxide is suspended in the electrolyte. The main process conditions of the high temperature method are: electrolyte temperature 95~100 °C, electrolyte sulfuric acid concentration 30~50g/L, anode current density 40~100A/m ² . Compared with the low temperature method, the high temperature method has the advantages of low anode current density, low electrolysis cell material requirements, simple operation and continuous production, and is currently the most important method for producing EMD in various countries.
The manganese dioxide deposited on the anode by the high temperature method becomes an electrolytic manganese dioxide product after being subjected to treatment such as peeling, pulverization, rinsing, neutralization, and drying.
Electrolytic manganese dioxide can be divided into manganese carbonate ore method, manganese oxide reduction roasting method and "two ore" method according to different raw materials. At present, the manganese acid ore method is widely used in China, that is, the manganese carbonate ore powder is leached by sulfuric acid to obtain a manganese sulfate solution which is filtered, purified and electrolyzed. In foreign countries, the manganese oxide reduction roasting method is adopted, that is, the manganese dioxide ore is pulverized, reduced and leached, purified, and electrolyzed. The "two mines" method is formed by reducing, leaching, purifying and electrolyzing MnO ₂ ore and pyrite .
The manganese dioxide produced by electrolysis has a grade of 90% to 94% and is in the form of γ crystal, which has the characteristics of high density and high packing density. It also has the advantages of large discharge capacity and low discharge overpotential in electrochemical energy generation. EMD accounts for about 90% of the world's manganese dioxide production.
The process flow for producing electrolytic manganese dioxide from manganese carbonate or manganese dioxide ore is shown in the following figure.

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