Fine dried Magnetite, produced from natural iron oxide, is used in foundry as a sand additive to prevent surface defects of the casted metal. Another use for our natural mineral is for heat storage or as an iron source for iron catalysts.

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Magnus Johansson

Magnus Johansson

Business Development Manager - Americas Region

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Heat storage

Our customers are using our natural iron oxide mineral because it can store heat very well. They are mixing our Magnetite for over 30 years in heat blocks in Night Storage Heaters.

If you look for a larger storage opportunity for thermal heat, Magnetite is a sustainable solution. Facts about our natural mineral that confirm its potential for upscaling heat storage are clear:

  • Abundant availability
  • Relatively cheap
  • Chemically stable (even after many cycles of heating and cooling)
  • High heat resistance (1000 degrees Celsius is not a problem)
  • Not flammable
  • High heat capacity per volume (~3.4 J/cm3*K) in comparison with other minerals
  • Interesting thermal physical characteristics

Magnetite grades for use in foundry applications

Do you want to prevent surface defect in the casted metals made in foundries? Then our product grades for foundry are your solution. We have this product available in several grades.

LKAB Minerals mines and processes the natural mineral magnetite from which a very pure, dried and fine milled powder, is made. Owning the source and processing plant to make Magnetite ensures our customers with a long-term, reliable source of consistent quality material.

Our dried fine powdered iron oxide is ferri-magnetic, greyish-black in colour as well as thermally and electrically conductive.

Iron catalysts based on Magnetite

The third use for our iron oxide is as an iron source for iron catalysts which are used to improve or increase the rate of reaction in chemical processes. Because of its high iron content, the LKAB Minerals product is an ideal solution.

Powdered Magnetite

Standard grades

Our Magnetite is available in coarse and fine grades as well as mixtures of these grades. We also have fine dried Magnetite available.

Each grade has a controlled particle size distribution.  We design our grades in such a way that we ensure this natural mineral fits your application.


For your convenience, we can deliver our product in bulk or bags by:

  • Ship
  • Barge
  • Container
  • Train
  • Individual truckload

LKAB Minerals is part of the LKAB Group. We have offices around the world as well as dedicated Sales Managers. Most locations have storage facilities allowing for efficient on-time and economical supply.

The typical properties of Magnetite are:

Physical properties of Magnetite

Bulk density [t/m3]
2 - 4
Specific gravity [t/m3]
4.6 - 5.1

Chemical properties of Magnetite

Fe [%]
62.0 - 71.1
Fe3O4 [%]
86 - 99

Magnetite mineral origin

Mined from our group resources, we can ensure long-term availability and consistent quality of our products. Kiruna and Malmberget, in the northern part of Sweden, are the places where our magnetite mines are located. The ore is mined and processed at the mine site and railed to one of the two ports – Luleå (Sweden) or Narvik (Norway). The ports are part of the LKAB Group logistics structure and operated year-round.

Magnetite toxicology

Magnetite for foundry applications is harmless to the environment, non-toxic in all its forms and for all practical purposes – inert. You can download the Safety Data Sheet from the DOCUMENTATION tab (top of this page).

For your convenience, we have created several videos and webinars related to Magnetite and all its applications, which you can watch in your own time.




We have recorded several Magnetite related webinars which you can watch at your convenience from our Learning Centre.

Downloads on request

Safety Data Sheet