Abstract: Tuyere for the processing of metals in the liquid, solid or pasty state, and capable of introducing simultaneously and separately a gas and a powdered material. The tuyere comprises at least two well-centered concentric tubes, the gas being introduced into a non-external tube, and the powdered and compressed material being introduced into another tube, which is lubricated on its inner wall by a film of a lubricating substance introduced through a slot formed therein. The outer tube is traversed by an agent protecting the tuyere against its hot wear.

Abstract: Improvements in multiflow refining blastpipes for equipping converters for refining and including at least two concentric tubes 1 and 3, which define between them an annular gap 4 and an annular ring 8 connected by welding onto the outer tube 3, which consist in arranging at the end of the outer tube 3 which is located next to the inlet for the fluids into the blastpipe, a shoulder 12 prolonged by a cylindrical portion 13 which defines an annular chamber 14 for the introduction of a protective fluid, and in arranging the annular ring 8 on the said cylindrical portion 13.

Abstract: A blast pipe is formed of a plurality of concentric tubes, the cross-sections of which are designed for the fluid flows required for the refining of a metal bath, which are used initially as a burner. A second tube adjacent an outermost tube, projects beyond the end of the outermost tube, and is provided with a row of orifices in the projecting portion. The end of the second tube is closed by a metal cap soldered to the second tube with a hard solder which melts at a predetermined temperature in relation to the metal of the bath to be refined.

Abstract: In a steelworks converter including blast-pipes protected by a flow of hydrocarbons, a device is provided for retaining the hydrocarbons, the device comprising a retaining assembly forming a cup on the bottom plate of the converter and having substantially the same area as the bottom plate, and a seal for sealing around the blast pipes where they project through the base of the cup.