1. Process for repairing the refractory lining (14) of the inner wall of a conduit (5, 6) for conveying gas heated to a high temperature by a plasma torch (8) and intended to be injected into a melting-reduction tank furnace, the plasma torch (8) being received in a side fitting (7) of the conduit and producing a plasma jet eroding the lining, characterized in that the area of wear (16) of the said refractory lining is repaired by spraying finely divided solid refractory material preheated, by virtue of the said plasma torch (8), to a high temperature capable of promoting its adhesion to the wall to be repaired.
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