1. Crucible induction furnace

1.1 Coating design

• Hearth and coil: hearth and coil linings are designed to ensure safety in the event of metal breakthrough or infiltration. Increasingly, they use modern materials such as cast-in-place or prefabricated refractory concretes.

  For the sole, an alumina content of between 60 and 70% is recommended.

  For the coil, the recommended material is high-conductivity to promote heat dissipation, with an alumina content of over 80%. This coil lining, with a thickness of between 20 and 30 mm, can advantageously be cast in situ.

• Lid and water-jacket: these two areas do not require extreme safety conditions.

  They must, however,...