The Smelting Method of Ferromanganese - Electric Furnace Smelting

There are two methods for reducing and smelting ferromanganese: flux method (also known as low manganese slag method) and flux free method (high manganese slag method). The principle of the flux method is the same as that of blast furnace smelting, except that electricity is used instead of heating coke. By adding lime to form high alkalinity slag (CaO/SiO2 range from 1.3 to 1.6), the loss of manganese can be reduced. The non flux method of smelting without adding lime forms low iron, low phosphorus, and rich manganese slag with low alkalinity (CaO/SiO2 less than 1.0) and high manganese content. This method has a small amount of slag, which can reduce power consumption and reduce the evaporation loss of manganese due to the low slag temperature. At the same time, the by-product rich manganese slag (containing 25-40% manganese) can be used as raw material for smelting manganese silicon alloy, achieving a high comprehensive recovery rate of manganese (over 90%).