In steelmaking, ferromanganese is mainly used as a deoxidizer and alloy additive, and is the most used iron alloy. The manganese ore used for smelting ferromanganese is generally required to contain 30~40% manganese, the ratio of ferromanganese is greater than 7, and the ratio of phosphorus to manganese is less than 0.003. Before smelting, manganese carbonate ore should be roasted and powder ore should be sintered into blocks. The ore with high iron and phosphorus content can only be used together, or the manganese rich slag with low iron and low phosphorus can be refined by selective reduction. Smelting with coke as reducing agent, some plants also use lean coal or anthracite. The auxiliary raw material is mainly lime, and silica is generally added when smelting manganese silicon alloy.