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Transalloys produces manganese alloys, mainly refined silicomanganese and medium carbon ferromanganese, which it sells to customers in South Africa as and internationally. Transalloys produces roughly 140 000 Tons of silicomanganese and 40 000 Tons of medium carbon ferromanganese. Silicomanganese (SiMn), a ferroalloy with high contents of manganese and silicon, is made by heating a mixture of the oxides manganese oxide (MnO2), silicon dioxide (SiO2), and iron oxide (Fe2O3), with carbon in a furnace. They undergo a thermal decomposition reaction. It is used as a deoxidizer and an alloying element in steel. The standard grade silicomanganese contains 14 to 16% of silicon, 65 to 68% of manganese and 2% of carbon. The low carbon grade SiMn has carbon levels from 0.05 to 0.10%.
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