Manganeisen

Generally, the blast funace below 1000 meters is used, and the equipment and production process are roughly the same as that of the ironmaking blast furnace. In the process of falling from the top of the furnace, high-priced manganese oxide (MnO2, Mn2O3, Mn3O4) is gradually reduced to MnO by CO as the temperature rises. However, MnO can only be directly reduced to metal through carbon at high temperatures, so smelting ferromanganese requires a higher furnace temperature, so the blast furnace for smelting ferromanganese uses a higher coke ratio (about 1600 kg/ton) and wind temperature (above 1000℃). In order to reduce manganese loss, the slag should maintain a high alkalinity (CaO/SiO2 greater than 1.3). Because of the high coke ratio and low indirect reduction rate, the gas yield and CO content of ferromanganese blast furnace are higher than those of iron blast furnace, and the top temperature is also higher (above 350℃)