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: An improved process for reducing the rate of wear and for minimizing the amount of liquid cooling agent supplied to a tuyere used for blowing oxidizing gas in the refining of molten metal. The fluid passageway of the tuyere is provided with an outlet having a reduced cross-sectional area and the cooling agent is injected at a flow rate between 0.05 and 0.14 liters per minute per centimeter of the circumference of the fluid passageway.

Abstract: In a process for treating a bath of molten metal in a refractory-lined metallurgical furnace by introducing oxygen into the bath, an improved method for protecting selected portions of the refractory lining against wear. Liquid hydrocarbons are controllably injected through ports in the lining located in proximity to the aforesaid selected portions so as to direct the hydrocarbons toward the selected portions and thereby prevent corrosion by constituents of the bath.

Abstract: A rotary connector for connecting a fixed pipe to a movable pipe for fluid flow therebetween comprising a cylindrical stator having an input for supplying fluid thereto tangentially of the axis of the stator and adapted to be coupled to the fixed pipe, and a rotor rotatable about the axis of said stator and having an output extending in a direction perpendicular to the plane of said tangential input and connectable to the movable pipe, the rotor comprising a plurality of demountable parts. The rotor may comprise two main body parts which are received within the stator and abut oppositely directed shoulders on the stator, the parts having opposed spaced faces between which the inlet opens and which are shaped to direct the fluid axially into the outlet in one of the parts, the two parts being releasably fixed together.

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: Blast furnace tuyere comprising three separate injection chambers, a first axial chamber for injecting hot blast, a second narrow annular chamber concentric therewith for injecting fuel oil and a third annular chamber concentric with the other two for injecting oxygen mixed with cold air. This tuyere dispenses with a water cooling circuit.

Abstract: A blast pipe assembly for mounting on attachment to and dismounting from the bottom plate means of a converter or furnace for refining metals, the plate means including a hollow cylindrical part for surrounding the blast pipe and having at its lower end portion an inner shoulder and a flange for clamping bolts, the blast pipe assembly comprises two concentric pipes for double separate feed, the inner pipe of said concentric pipes being longer than the outer pipe of said concentric pipes and the inner diameter of said outer pipe being greater than the outer diameter of said inner pipe to define a gap between said pipes for admission of fluid, the lower end of said outer pipe, which is arranged to be at the level of said shoulder of said hollow cylindrical part, being flared, said inner pipe having, at a level below the lower end of said outer pipe, a circular swelling;A hollow cylindrical injector body adapted to be arranged between said flared portion of said outer pipe and said circular swelling on said inne

Abstract: A device for clamping the base plate of a steel refining converter against a plate support ring attached to the casing of the converter comprises a plurality of rotatable brackets arranged to be beneath and around the circumference of the plate, each bracket being rotatable on a metal spindle passing through two parallel support flanges attached to the ring, and having a first shoulder with a very hard surface to be pressed against the base plate when the base plate is clamped in position, and an internally threaded second shoulder into which is screwed a retaining screw at the end of which is a ball which, when the base plate is clamped in position, engages in a semi-cylindrical groove in a metal bolt which engages in openings formed in each of said support flanges.

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.