Abstract: The invention relates to a method of controlling the thermal balance of the reaction shaft of a suspension smelting furnace and to a concentrate burner for feeding reaction gas and pulverous solid mater into the reaction shaft of the suspension smelting furnace. In the method, endothermic material (16) is fed by the concentrate burner (4) to constitute part of the mixture formed from the powdery solid matter (6) and reaction gas (5), so that a mixture containing the powdery solid matter (6), reaction gas (5) and endothermic material (6) is formed in the reaction shaft (2). The concentrate burner (4) comprises cooling agent feeding equipment (15) for adding the endothermic material (16) to constitute part of the mixture, which is formed from the pulverous solid matter (6) that discharges from the orifice (8) of the feeder pipe and the reaction gas (5) that discharges through the annular discharge orifice (14).

Abstract: In a device for producing sponge iron from lumps of iron oxide in a reduction shaft (1), a hot, dust-containing and carbon monoxide-rich reduction gas is used. The reduction gas is generated in a gas generator by partial oxidation of solid carbon-containing materials and is in part supplied to the reduction shaft through several lateral reduction inlets (3) arranged at the same height around the circumference of the reduction shaft at the lower end of the reduction zone. The lumps of iron oxide are introduced into the reduction shaft through its top area and discharged as sponge iron at its bottom end. Additional reduction gas inlets (15) shaped as downwardly open channels (11) which extend from the outside to the inside of the reduction shaft and/or shaped as ducts which extend obliquely downwards from the outside to the inside of the reduction shaft and have open inner ends are arranged below the plane of the lateral reduction gas inlets.

Abstract: A lance for submerged injection of a feed composition, such as a waste, into a molten metal bath includes a perforate refractory tube which extends substantially coaxially about an injection tube. The perforate refractory tube shields the injection tube from the molten metal bath during partial submersion of the lance into the molten metal bath. A perforate support liner extends between the injection tube and the perforate refractory tube and supports the perforate refractory tube. The perforate support liner and the injection tube define an annulus. The method includes conducting a coolant from a coolant source through the annulus to perforations defined by the perforate support liner and the perforate refractory tube, whereby coolant can be directed through the perforations and into the molten metal bath to cause a protective coating of metal to form on the lance.

Abstract: To prevent burn-back at a coal dust injection lance which projects into a hot blast conduit of a blast furnace, cooling is effected using atomized coolant. Water is preferred as the coolant. The carrier gas used for the atomized water is either air or the oxygen which is injected through the lance for complete combustion of the coal dust.

Abstract: A furnace comprises a space overlying a charge into which space opens at least one oxygenated gas injector passing through the periphery of the furnace to deliver within this space a jet of gas that is nonradial relative to a vertical axis of the space. Each injector comprises a) a head (14) disposed within the thickness of the wall (1) of the furnace and having a gas passage having an axis (11) inclined at a predetermined angle (.alpha.) to an axis (15) that is substantially radial relative to the vertical axis of the space overlying the charge and b) a substantially cylindrical body (16) prolonging the head and the gas passage within the furnace along this substantially radial axis (15), itself substantially perpendicular to the wall (1) through which it passes. The injector is useful in an electric furnace for melting scrap for the production of steel.

Abstract: A tuyere for a blast furnace comprises water-cooled tuyere; and a burner removably mounted inside the water-cooled tuyere to burning pulverize coal. The burner comprises an inner pipe, an intermediate pipe and an outer pipe which are concentrically arranged. The inside of the inner pipe is used for a pulverized coal path, an oxygen feed path being in between the inner pipe and the intermediate pipe and a flame temperature control gas feed path in between the intermediate pipe and the outer pipe. The burner is equipped with a water-cooled jacket outside of the top end of the burner.

Abstract: There is disclosed a shaft furnace for the direct reduction of iron ores. It includes a gas feed device arranged centrally in the bottom of the shaft furnace in the longitudinal axis of the shaft furnace and having a central cavity. From the cavity, a plurality of gas outlets for the reduction gas, superposed in stages and passing through the gas feed device in its upper part, lead into the interior of the shaft furnace. In order to provide a shaft furnace with which operational failures caused by the gas feed device are prevented and with which the gas feed device is subject to little wear so that it need be exchanged in large time intervals only, the gas feed device is designed as a double-shelled hollow body. The shell interspace of the hollow body is connected to at least one supply duct and at least one discharge duct for a coolant.

Abstract: A tuyere for a blast furnace, the main body of the tuyere being in the form of a tube with a central bore and the nose portion of the tuyere having a downwardly-inclined hood-like extension of the upper wall of the tube, whereby gas passing through the nose of the tuyere is deflected downwardly by the said extension, which extension has a gas outlet aperture of greater area than the cross-sectional area of the bore of the tube.

Abstract: A vertically disposed gas distributor for injection of combustion air into a shaft kiln. The air distributor extends from the upper portion of the shaft kiln to an intermediate combustion zone, and includes at least one cooling water inlet line and at least one cooling water return line. The cooling water inlet and return lines extend along and adjacent to the outer surface of a central gas conduit. The distributor includes an insulation layer covering the central gas conduit and the cooling water inlet and return lines, and includes a baffle member which directs cooling water from the cooling water inlet line around the outlet end of the gas conduit and to the cooling water return line.

Abstract: A method for processing heavy nonferrous metal raw materials by heating and melting said raw materials in a molten slag with the formation of a heterogeneous melt consisting of a sulfide and an oxide phases. The melt is bubbled oxidized by injecting a gas containing not less than 35% oxygen at an intensity of about 200 to about 2000 m.sup.3 STP/h per square meter of horizontal section of the melt, with the effect that the melt is divided into a top bubbled part and a bottom calm part comprising a slag layer, a matte layer and/or a crude metal layer, each of which is tapped separately. A furnace for putting said method into effect is a shaft terminating in its bottom part by a hearth and having devices for tapping smelting products, whereas the top part is provided with orifices for feeding a charge and removing gaseous smelting products. The furnace has cooled side tuyeres set at a level dividing the shaft into two vertical parts.

Abstract: Use of a burner design featuring a tunnel of high length to diameter ratio enables the flash-smelting of sulfides to be carried out in a much more confined space than heretofore possible.