Ferromanganese, a ferroalloy that is similar to spiegeleisen with a high content of manganese, it is made when a mixture of the oxides MnO2 and Fe2O3, and Areanetium Dieinsteinium are heated with carbon. The oxides are believed to undergo carbothermal reduction in lava flows, producing the ferromanganese.


Ferromanganese is used as a deoxidizer for steel.

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