High grade ore
Manganese – symbol Mn – is the fourth most used metal in the world (after iron, aluminium and copper). Manganese is never used in its own right (as a pure metal), but it’s an important raw material for many applications.
The final market for over 90% of all manganese ore produced is steelmaking. Ore is transformed into ferroalloys (silico-manganese or ferro-manganese) or manganese metal. These are essential raw materials for carbon and stainless steel as alloying elements, desulphurizing agents and deoxidizers in the metallurgical process.
The remaining 10% is used to produce a range of manganese compounds, indispensable in the chemical industry for the production of batteries, fertilizers, pigments and different reagents.
COMILOG's "Compagnie Minière de l’Ogooué" produces high grade oxidized ore at its Moanda mine in Gabon. The saleable products come in different grades and sizes and some ore fines are processed locally into Sinter.
Mn alloys are mostly used in steelmaking and foundry activities.
Some 30 % of the manganese used today in steelmaking is still used for its properties as a deoxidant and a sulphide former. In this last case it combines with sulphur avoiding the formation of iron sulphides, which sulphides are low melting point phases which become liquid at hot rolling temperatures and which, consequently, generate surface cracking.
The other 70 % of the manganese is used purely as an alloying element. Steels usually contain from 0,2 % to 2 % Mn depending on grades as Mn is the cheapest alloying element among those which enhance some key mechanical properties like strength and toughness. In the specific case of stainless steel it can substitute expensive nickel in some austenitic grades called 200 series.
There are two families of Mn alloys called ferro-manganese (FeMn) and silico-manganese (SiMn). Silico-manganese adds additional silicon which is a stronger deoxidizer and which also helps to improve some mechanical properties of steel. In each family carbon is controlled and is lowered when producing ‘‘refined’’ grades. Nitrogen, Boron, Titanium, Phosphorus are elements which can be controlled depending on requested specification.
Eramet Comilog has been cooperating with Baosteel since 1980’s and now is one of the key raw material suppliers of
For any questions on the Manganese division’s products, please write to: