Abstract: A method for flame spraying of gunite on the lining of metallurgical units, comprising a delivery of a mixture of a refractory material and fuel in a central axisymmetric flow and a delivery of oxygen in an annular flow concentric with the flow of the refractory material and fuel, a heating and fusion of the refractory material in a high-temperature flame, and applying particles of the refractory material to the surface of the lining. Oxygen is delivered in a tapering annular flow rotating about its axis. The ratio between the rotation momentum of the oxygen flow and the momentum of the flow of the refractory and fuel is maintained in the range of 0.3 to 3.0.

Abstract: A flame guniting lance comprises a water-cooled casing made up of pipes (1 and 2). Arranged concentrically inside the casing are pipes (4) for supplying a mixture of powdered refractory material and fuel, and pipes (3) for supplying oxygen. Each pipe (3 and 4) is respectively fitted with a nozzle (5) for supplying the mixture of refractory material and fuel, and a nozzle (6) for supplying oxygen, the nozzles being arranged in pairs and coaxially in each pair. The outlet cross-section of each nozzle (5) is positioned below the outlet cross-section of each nozzle (6) within a distance of 1 to 5 times the inside diameter of the nozzle (5). The walls of at least one of each pair of the nozzles (5 or 6) are partly or completely other than cylindrical in shape.