FIELD: metallurgy. SUBSTANCE: hot surface of refractory lining is subjected to pulverized powder containing mixture of refractory particles, exothermically oxidizable fuel particles, and amount of oxygen large enough for complete oxidation of fuel particles. Around pulverized jet, continuous gas curtain is created in the form of annular jet delivered by the second outlet opening or a group of openings. Lance for pulverizing powder when refractory ceramic mass is fettled has outlet opening 1 to feed refractory particles and exothermically oxidizable fuel particles in oxygen-containing carrier gas and outlet annular opening or group of openings 2 annularly embracing output opening 1 serving for supplying gas to form gas curtain surrounding carrier gas jet and being largely in parallel to the latter. EFFECT: enhanced efficiency of process. 14 cl, 3 dwg
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