Ferromanganese, a ferroalloy with high content of manganese, is made by heating a mixture of the oxides MnO2 and Fe2O3, with carbon, usually as coal and coke, in either a blast furnace or an electric arc furnace-type system, called a submerged arc furnace. The oxides undergo carbothermal reduction in the furnaces, producing the ferromanganese. Fer...
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http://en.wikipedia.org/wiki/Ferromanganese
(from the article `manganese processing`) The primary product of the smelting process outlined above is a carbon-saturated ferroalloy containing 76 to 80 percent manganese, 12 to 15 percent ... Aluminum or ferrosilicon are added to the ladle before or during the tap in order to lower the level of dissolved oxygen in steel. Ferromanganes...
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http://www.britannica.com/eb/a-z/f/20
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