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 Magnetite is for heat storage or as an iron source for iron catalysts.

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Magnus Johansson

Magnus Johansson

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Heat storage with Magnetite

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 Magnetite that confirm its potential for upscaling heat storage are clear:

  • Natural mineral
  • 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 Magnetite for foundry is 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 Magnetite is ferri-magnetic, greyish-black in colour as well as thermally and electrically conductive.

Iron catalysts based on Magnetite

The third use for our Magnetite 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 Magnetite is an ideal solution.

Powdered Magnetite

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 Magnetite 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 on the right of this page.

Downloads on request

Safety Data Sheet