How are diamonds separated from ore?

How are diamonds separated from ore?

There are different stages when analysing the diamond separation process. Underground mining methods involve the blasting of ore, to be removed from under the ground. The ore is collected and brought to the surface for processing. Once the ore is retrieved, the diamond processing begins. The different phases in separating diamonds from ore include:

  • Phase 1 – Crushing of the ore: The diamond-bearing ore is transported to a primary crusher, to crush the ore in to smaller particles, making it easier to handle (no bigger than 150mm).
  • Phase 2 – Scrubbing and screening: Scrubbing the ore will help to remove all loose particles that are not considered diamond-bearing. Screening also helps to separate finer particles, in order to get rid of excess material.
  • Phase 3 – Dense media separation plant: The next phase involves a process called dense media separation or heavy medium separation. Ferrosilicon is mixed with water to create a medium with a specific density, which is then fed into a cyclone. The diamond-bearing ore is then added to the mixture, so that the tumbling movement of the cyclone can let the separation take place. Heavier particles (the diamonds and minerals) will sink to the bottom, while lighter material will float. This leaves a layer of diamond rich concentrate, for easy diamond recover.

Dense Media Separation is a very quick, effective and cost-efficient method of diamond recovery. It is used by diamond plants across the globe for the recovery of diamonds and minerals.

Atomised FeSi: Coarse, Fine, Cyclone 60, Cyclone 40, DMS 70
Milled FeSi: 65D, 100D, 150D, 270D, 270F

Ferrosilicon for diamond recovery

DMS Powders is a manufacturer of Ferrosilicon for the use in Dense Media Separation. To accommodation the different needs of different plants and processes, DMS Powders manufacture a range of Ferrosilicon products in different grades. This ensure that our clients get the best products for their process needs. With a range of Atomised and Milled ferrosilicon products available, you are sure to get the best Ferrosilicon with the ideal properties for your Dense Medial Separation process.

  • Atomised Ferrosilicon (FeSi): Coarse, Fine, Cyclone 60, Cyclone 40 and DMS 70.
  • Milled Ferrosilicon (FeSi): 65D, 100D, 150D, 270D and 270F.

Get in touch with a team member at DMS Powders today to place an order for the Ferrosilicon you need. Our Ferrosilicon come in different containers and sizes, and are packaged for easy transportation. Contact DMS Powders today for more information about our Ferrosilicon products, and to place your order.

DMS Powders is a leading producer of Ferrosilicon in Southern Africa, distributing quality Ferrosilicon products to clients across the world. DMS Powders manufactures the following Ferrosilicon products for diamond and metal recovery processes:

  • Atomised FeSi – Coarse, Fine, Cyclone 60, Cyclone 40 & DMS 70
  • Milled FeSi – 65D, 100D, 150D, 270D and 270F

For more information about Ferrosilicon products from DMS Powders, read more on our website, or speak to a professional consultant  today. Order your Ferrosilicon products from the leading Ferrosilicon manufacturer to ensure that you get quality products at cost-effective prices.


Our packaging has been specifically designed for:

Ease of handling
Product integrity
Water resistance

125kg steel drums on pallets

250kg plastic drums on pallets

1mt & 2mt bags loose or on pallets

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