Heavy media separation with Magnetite

Magnetite is used to produce dense medium slurry for coal washing, mineral processing and recycling of metals and plastics.

Due to its ferrimagnetic properties the LKAB Minerals’ magnetite can be easily reclaimed and reused in the density separation processes.

Principles of heavy media gravity separation

Gravity separation means separating products with different densities. Magnetite and water are used to make a slurry on which one product will float (the product with a lower density than the slurry) and in which the other product will sink (the product with a higher density than the slurry). Hence the term sink-and-float separation is often used. Depending on the densities of the products that need separating, the ratio of magnetite and water in slurry can be varied to achieve the required intermediate density.

Magnetite is used to make a dense medium slurry for heavy media separation

Benefits of using Magnetite in dense medium separation

As indicated above it is important for the separating slurry to have the right density. For many heavy media separation processes, this can be reached with Magnetite. LKAB Minerals’ Magnetite has a particle density of 5.1 t/m3.

What are the benefits of specifically using our Magnetite for this type of media separation?

  • Very pure: 99% Magnetite and 71.5% Fe meaning a higher density than the regular magnetite available
  • Low water absorption (<0.3%)
  • Recyclable due to its ferrimagnetic properties
  • Chemically very stable
  • Consistent; allow very precise determination of the slurry density
  • Durable
  • Non-toxic
  • Natural mineral
  • Environmental friendly

Magnetite can be recycled and reused from the density separation process

Because we get Magnetite from our own resources in the Northern part of Sweden, we know that the properties of our products remain of constant quality.

Easily contact your local LKAB Minerals Sales Team member by selecting your county in the above right expert box.

Application expert

Marina Hellsten
Sales Manager Magnetite

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