Flame gunning of refractory linings

In a method of repairing a refractory lining of a vessel lined with refractory by a flame-gunning process, comprising flame-gunning a patching material consisting of refractory particles and carbonaceous fuel powder, together with an oxygen containing gas to fuse or semi-fuse the refractory particles in a region surrounded by high temperature flame, and strucking the flame-gunned material against the surface of the refractory lining to produce a deposit layer of the refractory particles, the improvement comprising flame-gunning at an initial stage of repairing a patching material having a higher mixing ratio of the fuel powder, and subsequently flame-gunning, in order with the progress of rapairing, patching materials in which the mixing ratio of the fuel powder is lowered stepwise, and during which blowing the oxygen containing gas in such an amount that the oxygen content in the oxygen containing gas is substantially less than the theoretical amount required for complete combustion of the fuel powder, and controlling a blow rate of the oxygen containing gas in accordance with the change of the mixing ratio of the fuel powder in the patching material.