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Thanks to a vertical integration policy led by the Groupe Roullier, we can steer each stage to provide you with the most suitable magnesia for your needs, from the choice of the raw material extracted from our integrated mines.

The calcination of a carbonate

Depending on the ore deposit, approximately 25 tons of ore must be extracted from the pit to obtain one ton of Magnesium oxide from the plant.

Magnesium oxide (MgO) is obtained through calcination of Magnesium carbonate via the following reaction:

MgCO3 calcined up to 600°C or 1100°F >> CO2 + ‘MgO called Caustic Calcined Magnesia ‘CCM’

MgO caustic calcined at more than 600°C or 1100°F >> MgO called Dead Burned Magnesia ‘DBM’ 


Key dates

Some key dates from more than 40 years of knowledge and experience in Magnesia business within Groupe Roullier:

  • 1976 – Beginning of Groupe Roullier Magnesium business activities
  • September 2000 – Acquisition of MAGNESITAS NAVARRAS 
  • June 2012 – Opening of China sourcing office – Dalian
  • January 2012 – Acquisition of Van Mannekus
  • January 2013 – Acquisition of MAGNESIUM DO BRASIL
  • Avril 2018 Acquisition of 100% stakes in Magnesitas Navarras