Silicon Manganese (in bulk)

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Infobox on Silicon Manganese (in bulk)
Example of Silicon Manganese (in bulk)
  • South Africa
  • Mozambique
  • Australia
  • Russia
  • Burma
  • Gabon
  • China
Stowage factor (in m3/t) -
Humidity / moisture -
Ventilation See text
Risk factors See text

Silicon Manganese (in bulk)


Silicomanganese (SiMn) is a ferroalloy composed chiefly of silicon and manganese; it is smelted by carbon reduction in ore heat-treating furnaces. Silicomanganese with 10–26% Si (the remainder is Mn, Fe, and impurities) is obtained from manganese ore, manganese slag, and quartzite and is used as a deoxidizer and alloying additive in the smelting of steel, as well as in the smelting of ferromanganese with reduced carbon content by the silicothermic process. Silicomanganese with 28-30 percent Si, for which pecially prepared high-manganese low-phosphorous slag serves as raw material, is used in the production of metallic manganese.

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%.

Shipment / Storage / Risk factors

Silicomanganese (with silicon content of 25% or more) is an extremely heavy cargo, silvery metallic material with a grey oxide coating. Shipment is in bulk or in (big) bags.

In contact with water may evolve hydrogen, a flammable gas that may form explosive mixtures with air and may, under similar conditions produce phosphine and arsine, which are highly toxic.

Mechanical surface ventilation shall be conducted during the voyage, as necessary, for the cargo spaces carrying this cargo.

See IMSBC Code (International Maritime Solid Bulk Cargoes Code) and applicable MSDS sheet.