Ferromanganese

Ferromanganese: an iron alloy of manganese and iron. Main categories: high carbon ferromanganese (carbon content is 7%), medium carbon ferromanganese (carbon content 1.0~1.5%), low carbon ferromanganese (carbon content 0.5%), metal manganese, mirror iron, silicon manganese alloy.

In steelmaking, it is 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 to 40% manganese, the ratio of manganese to iron is greater than 7, and the ratio of phosphorus to manganese is less than 0.003. Before smelting, manganese carbonate ore needs to be roasted first, and powder ore needs to be sintered to make blocks. Ores with high iron and phosphorus content can generally only be used together, or through selective reduction to produce low iron and low phosphorus manganese rich slag. Coke is used as a reducing agent in smelting, and 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.
The general international standard of carbon ferromanganese is 75 ~ 80% manganese, and in order to adapt to the raw material conditions of low manganese ore grade, China stipulates a lower grade of manganese (electric furnace ferromanganese containing more than 65% manganese, blast furnace ferromanganese containing more than 50% manganese). Smelting carbon ferromanganese mainly used blast furnaces in the past, with the development of electric power industry, the use of electric furnaces gradually increased. Western Europe and China mainly use blast furnaces, Norway, Japan use electric furnaces, the Soviet Union, Australia, Brazil and other countries also use electric furnaces in new ferro manganese factories.