Ferro-manganese

High Carbon Ferromanganese
 

Ferro-manganese is produced by reduction of Manganese Oxide in blast furnaces or electric furnaces. It is a very flexible process in that the slags can be reprocessed into Ferro-silicomanganese which in turn can be further refined into Medium and Low Carbon Ferro-manganese. Ferro-manganese was invented in 1860 by Sir Henry Bessemer as a way to add Manganese during steel making with the advantage that a combination of Iron and Manganese Oxide results in a lower melting point for the alloy Ferro-manganese compared to pure Manganese Oxide. Standard Ferro-manganese (or High Carbon Ferro-manganese) is a commonly used alloy produced by the reduction of manganese ore in the presence of carbon. Typically it contains 75% manganese and 7% carbon. Worldwide production of Ferro-manganese in 2008 was approximately 4.5 million tons, with China being the worlds largest producer.

Low Carbon Ferro-manganese:
 

When liquid Silicomanganese is reacted with Manganese Ore or a high MnO rich slag, the silicon is oxidized increasing the Mn content of the alloy without an increase in the carbon content. This method is commonly used in South Africa to produce grades of refined (Medium and Low Carbon) Ferro-manganese with Mn 75%-80% and higher with varying carbon contents from 0.1% to 2%. The price of the alloys increases as the carbon content is reduced and unlike standard Ferro-manganese is usually sold per unit of manganese contained.

Mn :   70 - 75 %
C :     0.1% Max
P :     0.35% Max
S :     0.35% Max
Si :    1.5%
Size : 20 - 150 mm

Medium Carbon Ferromanganese:
 

When liquid Silicomanganese is reacted with Manganese Ore or a high MnO rich slag, the silicon is oxidized increasing the Mn content of the alloy without an increase in the carbon content. This method is commonly used in South Africa to produce grades of refined (Medium and Low Carbon) Ferro-manganese with Mn 75%-80% and higher with varying carbon contents from 0.1% to 2%. The price of the alloys increases as the carbon content is reduced and unlike standard Ferromanganese is usually sold per unit of manganese contained.

Mn :    70 - 75 %
C :      1 - 2% Max
P :      0.35% Max
S :      0.35% Max
Si :     3 - 4 %
Size : 20 - 150 mm

High Carbon Ferromanganese:
Chemical Analysis

Mn : 70 - 75 %
C : 6 - 8% Max
P : 0.35% Max
S : 0.35% Max
Si :3 - 4 %
Size : 20 - 150 mm