Concrete rings are ceramic construction elements which on installation of the induction coil serve as buttresses and “fixing elements” below and above the induction coil. The lower concrete ring bears the thermal/mechanical forces of the crucible below the furnace coil. The upper concrete ring serves to hold down the furnace coil, which is “pushed” upward by the thrust forces of the ramming mix. These are made of fire-proof concretes which are resistant up to approx. 1,450 °C.
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