Caustic Calcined Magnesia: (CCM)

MgO is produced by the calcination of MgCO3 or Mg(OH)₂ or by the treatment of magnesium chloride with lime followed by heat. Calcining at different temperatures produces magnesium oxide of with different reactivity. High temperatures (1500⁰C to 2000⁰ C) produces dead-burned magnesia, an unreactive form used as a refractory. Calcining temperatures (1000⁰C to 1500⁰C produces hard-burned magnesia which has limited reactivity while lower temperature, (700⁰C to 1000⁰C) calcining produces light-burned magnesia, a reactive form, which is called calcined magnesia.

CCM is used in fertilisers and as a rawmaterial for various Magnesia chemicals for the production of pulp and paper, ceramics and cement. Also high purity caustic calcined magnesia is used in both the sintering or electrofusion process for the production of alumina-magnesia spinels used in basic refractories and special castables .