Abstract: In order to move a furnace body (1) and a furnace lid (2) relative to one another by approximately one furnace body width, the separating surfaces of the furnace body (1) and furnace lid (2) are inclined relative to the horizontal.The direction of movement when the furnace body (1) is moved then runs in the direction of the angle opening and, when the furnace lid (2) is moved, the movement is in the opposite direction.In order to reduce the frictional forces between the separating surfaces (4, 5) of the furnace body (1) and furnace lid (2) and to ensure that the relative movement of the furnace body (1) and the furnace lid (2) occurs under defined conditions, the furnace lid (2) is supported on at least two support points on the furnace body (1) on which roller tracks (6) are arranged together with support rollers (7) which roll on the tracks for a certain travel.

Abstract: An arrangement for charging an electric arc furnace with a relatively free-flowing charge of sponge iron or other iron-containing particles distributes the charge of particles within the furnace through a first chute before a melting stage of an electric arc steelmaking operation is begun, and then continuously through a second chute which extends through the roof of the furnace during the melting stage. The first chute extends from a hopper containing the sponge iron and can be moved when the roof is open to feed the charge into the furnace. A distributor cone at the lower end of this chute distributes the sponge iron in a predetermined pattern. A second chute affixed to the furnace roof and in communication therethrough with the interior of the furnace permits continuous charging of the furnace during operation.

Abstract: The invention relates to a method and apparatus for charging an electric smelting or reduction furnace. In accordance with the invention, a charge tube movable within the roof or smoke hood of the furnace and is normally held in a protected position therein. When charging of the furnace is desired, the charge tube is lowered into the furnace to serve as a means for channeling charge material into the furnace. Preferably, the charge tube is operative to accumulate charge material while in its protected position and to release the material as it is lowered toward the furnace pot.

Abstract: In an electric furnace a lifting means actuating the furnace cover includes a king post supported on the base. The king post is surrounded by a sleeve, which is liftable and lowerable relative to the same and has a cap on its upper end. The sleeve is hydraulically liftable and engageable with a cover carrying framework carrying the furnace cover. In order to provide for a lifting means with a low weight without constraining forces and with a structurally simple lubrication, a cylinder space to which a hydraulic medium is admitted is provided between a front face of the king post and the cap of the sleeve acting in the lifting direction. If desired, an annular space is provided between a collar of the king post and the inner wall of the sleeve, to which a hydraulic medium is provided, acting in the lowering direction.

Abstract: A plasma melting furnace includes a furnace body, a covering cap, one or more electrodes penetrating the bottom of the furnace body, and at least three plasma burners penetrating the furnace wall or the covering cap and arranged so as to be inclined towards the bottom. In order to achieve a high melting performance with a simultaneously low energy consumption, charging openings are provided in the covering cap for the continuous melting of small-sized material, such as light scrap and iron sponge. Their vertical axes are located in a plane extending through the angular symmetry of the normal projection of the axes of two neighboring plasma burners as well as between two vertical planes each extending perpendicular to the normal projections of the individual burner axes.

Abstract: To save space in furnace installations and obtain an optimum continuous charging, an arrangement is disclosed in which electric smelting furnaces are arranged in a furnace bay unilaterally, close to the adjacent ladle bay and the associated charging equipment and bins are provided sequentially in a vertical zone between the crane runways of the two bays. Bins are filled with iron material, such as iron sponge, alloying mechanisms, and fluxing substances by a conveyor traveling thereabove. The contents of bins are delivered through conveying and metering devices which are provided between crane runways to a reversible conveyor extending at a lower level and equipped with discharge mechanisms and fed through a charging tube 1 into electric furnace. A traveling metering device is provided for adding alloying into the furnace, and fluxing material for subsequent treatment in the ladle, through charging tube. A housing encloses the furnace on all sides, to prevent emissions.

Abstract: This invention relates to a shroud for a steel making electric-arc furnace which surrounds the electric-arc furnace main body for sound- and dust-proofing, having doors provided in the side wall of the shroud to permit the scrap bucket to move in and out of the shroud and an opening of a minimum width in the suction port of a dust collecting suction duct on the top wall to permit transverse movement of the bucket lifting means to the center of the electric-arc furnace main body.

Abstract: Particulate lime is discharged from a nozzle into an electric arc furnace through an inlet port in the roof or top of the furnace. The inlet port is laterally displaced from the electrode ports in the center of the top of the furnace. Lime is supplied to the nozzle through a duct pivoted on the furnace to swing the nozzle into alignment with the inlet port for charging lime into the pot and into a retracted position where the nozzle is shielded by the top from heat produced in the furnace. The nozzle has an axial length, axial direction, and cross sectional shape and width constructed and arranged to direct the lime away from the side wall and toward the central portion of the furnace without any significant impingement of the lime directly on the electrodes.

Abstract: A gas having high CO content evolved at reaction zone in a ferrosilicon-refining electric furnace is burned and deflected to wipe transversely on the top level of the charged raw materials with the aid of air introduced near electrodes through an air pipe. The burning of the gas is so controlled that a content of oxygen in the burned gas is within a range of 12-17% by volume by controlling a volume of the air to be introduced near electrodes as well as a volume of air invading into the furnace through a poking window and a gap between a shell of the furnace and a heat-shielding hood above the furnace. The CO-rich gas which has heretofore been exhausted in vain from the furnace can now be used to preheat the charged raw materials and prevents the furnace from blocking due to formation of crusts at the top level of the charged raw materials. The exhaust gas is now less noxious, has a higher temperature that can be used for driving a turbine of a generator.