Repairing technology of heating furnace for metallurgy

The invention discloses a repairing technology of a heating furnace for metallurgy. Through material mixing, feeding and material spraying technology process sequentially, a gunning material is uniformly sprayed and covered on a damaged surface of the heating furnace; a combining agent and an admixture agent are added, thus the repairing technology can be carried out under the condition that the furnace body has a higher temperature, moreover, the condensing speed rate is faster, the combining between the spraying material and the damaged surface is fastened and sufficient, and the repairing effect is better; a spray gun is adopted for spraying and coating operation, the required operation space in the repairing process is reduced, thus the thinner part of the damaged surface on the heating surface can be repaired by the operation personnel, also the spray gun is convenient and feasible to operate, and the repairing efficiency is improved; and the gunning material after mixing with water is sprayed and coated