Uses of Ferrosilicon

Uses of Ferrosilicon – DMS Powders, Ferrosilicon Producer

Ferrosilicon (FeSi) is an alloy of silicon and iron, a product produced by DMS Powders. DMS Powders supplies milled and atomised ferrosilicon powders, specifically for use in the Dense Media Separation of Diamonds. This process involves the application of ferrosilicon powders, in order to separate diamonds from diamond-bearing material.

If you require more information about our Ferrosilicon products, or would like to purchase your Ferrosilicon products from DMS Powders, contact us today for more information. DMS Powders is a leading producer of Ferrosilicon Powders in South Africa.


  • Atomised FeSi

    Coarse, Fine, Cyclone 60, Cyclone 40, DMS 70

  • Milled FeSi

    65D, 100D, 150D, 270D, 270F

The uses and application of Ferrosilicon

Depending on the percentage of silicon present in the ferrosilicon, it will directly influence the ferrosilicon density. The density of Ferrosilicon varies for the different ratios of alloy compositions:

  • FeSi 45 has a density of 5.1 g/cm3
  • FeSi 75 has a density of 2.8 g/cm3 .
  • FeSi 90 has a density of 2.4 g/cm3

Uses of ferrosilicon include:

  • Deoxidize steel: Ferrosilicon is used in deoxidizing steel as well as other ferrous alloys. This helps to prevent loss of carbon from molten steel.
  • Other alloys: Ferrosilicon is also used in the manufacturing of other ferroalloys.
  • Heavy media separation: Ferrosilicon is widely used in the metallurgical industry for the processes of atomisation, melting and heavy media separation reactions.
  • Pre-alloys: Ferrosilicon is used in the manufacturing of pre-alloys such as Magnesium ferrosilicon and other.
  • Arc-welding: Electrode coating for arc welding is often done by using Ferrosilicon as one of the components.
  • Electric industry: The electric industry uses Ferrosilicon as a source of pure silicon.
  • Silicon copper: The chemical industry requires the use of Ferrosilicon for the manufacturing of silicon copper.
  • Pidgeon process: The Pidgeon process is a method for magnesium metal production, by means of silicothermic reduction. Ferrosilicon is used as a source of silicon for this process.


Our packaging has been specifically designed for:

  • Ease of handling
  • Safety
  • Product integrity
  • Durability
  • Water resistance
  • 125kg steel drums on pallets

  • 250kg plastic drums on pallets

  • 1mt & 2mt bags loose or on pallets.

Application of Ferrosilicon from DMS Powders

Ferrosilicon manufactured by DMS Powders can be used in a number of applications, but the main use being in Dense Media Separation processes. Dense Media Separation, or the sink-float method, is an effective process used to separate diamonds from diamond bearing material. This process to initially sift diamonds is used in diamond plants across the world, due to its effectiveness and because it is cost effective as well.

The Ferrosilicon is used by mixing it with water in a cyclone, to form a pulp of a very specific density (close to the density of diamonds). The cyclone will help to push material with heavier density to the bottom and sides, while material with lower density will float, thus separating diamonds (or iron and other minerals) from material effectively.

DMS Powders manufacture a comprehensive range of quality Ferrosilicon powder for use in Dense Media Separation, offering Ferrosilicon in different grades with different specifications. This will help you to get the best Ferrosilicon product for your specific diamond processing needs. You can read more about the technical information and behavioural characteristic of our Ferrosilicon products, or get in touch with a professional consultant at DMS Powders today for the information you require.

You can trust DMS Powders, leading supplier of Ferrosilicon, to get competitive Ferrosilicon prices, quality Ferrosilicon products and a highly professional service. Get in touch with our team today to place your Ferrosilicon order.

Contact DMS Powders for more information about our Ferrosilicon products

Should you be in need of the services of a trusted Ferrosilicon supplier in South Africa, contact DMS Powders today. We will advise you on your best option when it comes to the selection of Ferrosilicon products for your use in diamond processing, or other application. DMS Powders produces Atomised and Milled Ferrosilicon products, conveniently packed for efficient transportation and easy handling.

Should you require more information about our Ferrosilicon products, or the use of Ferrosilicon in Dense Media Separation of Diamonds, contact us at DMS Powders today.

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