Abstract: Disclosed is an incinerating and melting apparatus for processing materials such as organic matters, inorganic matters and metals, which apparatus has a cylindrical or polygonal horizontal furnace body provided with a material charging port and a melt discharge port formed in the wall thereof, wherein a burner is mounted in the inner surface of the furnace body, the furnace body is oscillatorily rotatable in one and the other directions about its axis, and a melt receiver is detachably secured to the melt discharge port, or wherein the furnace body is fitted in a hood into which the melt discharge port opens and the melt receiver is detachably secured to the hood.

Abstract: A device for sealing the skirt of a converter waste gas recovery system is disclosed, which comprises a primary sealing apparatus adapted to enclose the converter mouth and mounted along the skirt along a lower edge thereof, a secondary sealing apparatus adapted to encircle about the primary sealing apparatus, and primary hydraulic cylinder for vertically moving the skirt together with the primary sealing apparatus, and a secondary hydraulic cylinder for vertically moving the secondary sealing apparatus independently of the primary sealing apparatus. The primary sealing apparatus is intended to provide sealing for the gap between the skirt and the converter mouth. The secondary sealing apparatus serves to insure sealing when the primary sealing apparatus has failed to provide proper sealing because of adhered slag along the rim of the mouth from prolonged operations.

Abstract: The specification discloses a ladle furnace apparatus for refining molten steel tapped from a steelmaking furnace therein. There are introduced molten steel and a slag making material into the ladle. The outer and inner lids of the ladle furnace are put on the respective receiving surfaces of the ladle to close the opening thereof. In the interior of the ladle, the slag making material is slagged by arc heating thereby to refine molten steel introduced therein by means of the slag. During the refining process, the suction of gas is carried out from a space formed between the outer lid and the inner lid. Therefore, a dust containing gas generated by reaction of the molten steel and slag enters the space between the outer lid and the inner lid passing through a gap formed between the inner lid and the ladle or electrode holes disposed in the inner lid to be sucked therefrom.

Abstract: An apparatus for sealing the skirt of a converter waste gas recovery system is disclosed, which includes an annular flange that is mounted about the outside surface of the converter adjacent to its mouth at a point clear outside the reach of the molten slag and metal that might spill over the rim of the converter mouth during the process of blowing. An annular sealing band is provided at the lower peripheral portion of the skirt, which runs surrounding the mouth. The annular sealing band is divided into multiple arcuate segments of a whole bandage, each pivotally disposed on a horizontal pin and connected to a separate hydraulic cylinder through its axially movable piston rod. It is so designed that the segments of the annular sealing band are individually yet simultaneously swung about their respective pins by their hydraulic cylinders into abutting contact with the external periphery of the flange providing a tight leakproof seal.

Abstract: The exhaust-gas treatment system of a sealed-type steel converter is operated at the time of an emergency during blowing by a method which comprises stopping the blowing of oxygen, opening an emergency air suction device connected to the hood while, at the same time, maintaining a converter controlling damper at its degree of opening at the time of stopping of the blowing, disconnecting the skirt of the hood from the converter mouth, and opening the damper to a specific degree of opening. By this simple method, sudden and great pressure drops within the converter are prevented, whereby CO gas of high purity can be efficiently recovered without the occurrence of damage to parts of the system due to abrupt pressure difference and explosion of CO gas.

Abstract: The invention relates to a metallurgical vessel with a heat shield placed above it and spaced from it by a peripheral air gap. At least one opening is provided in the heat shield through which a probe, lance, or electrode is inserted from the outside into the interior space of the vessel. The heat shield is surrounded by a suction hood placed around the heat shield and opened towards the bottom. The suction hood surrounds the vessel, reaching beneath the peripheral air gap. The air space formed between the heat shield and the suction hood is connected to a suction device. To create a metallurgical vessel of the kind mentioned above which guarantees the effect of suctioning off of the process gases and dust and at the same time provides an effective shield of the ambient air from the molten metal, within the suction hood (1) a partition (3) is placed projecting on the outside from the peripheral gap (2).

Abstract: A suction duct having two opposed suction ports is disposed at the top wall of a shroud for a steel making arc furnace such that the two suction ports are in opposed relationship with respect to each other across an opening formed through the top wall of the shroud for permitting the lateral movement of a scrap bucket suspension device. An injection pipe or pipes are horizontally disposed in the suction port such that the injection pipes disposed in one of the suction ports are staggered vertically with respect to those disposed in the other suction port. A fluid is horizontally sprayed from a nozzle or nozzles of the injection pipes across the opening so that vertically spaced fluid shelves are formed across the opening.

Abstract: An upwardly open vessel which, in use, contains a metallurgical melt, the upwardly open vessel having an upper rim. A suction hood having a lower rim sized and shaped so that, in use, the lower rim of the suction hood opposes the upper rim of the upwardly open vessel but is spaced therefrom to permit ambient air to enter through an annular gap therebetween. A covering bell having a lower rim is mounted on the underside of the suction hood in position so that, in use, the lower rim of the covering bell isolates a portion of a slag cover on a metallurgical melt in the upwardly open vessel. Corresponding openings are provided in the suction hood and the covering bell to permit access to the isolated portion of the slag cover by an externally operated probe or the like.

Abstract: An exhaust-gas treatment system for a sealed-type converter has a hood for guiding converter exhaust gas and is provided with an emergency air admission valve device communicatively connected to the hood and comprising, essentially, a valve seat communicating with a valve entrance for inflow of outside air, a valve body normally in valve closed position against the valve seat to shut off air from entering the hood, and a valve body locking device functioning to normally hold the valve body in locked state in the valve closed position and operating in an emergency to release the valve body, which thereupon separates away from the valve seat thereby to admit outside air into the hood to prevent occurrence of negative pressure in the hood.

Abstract: The installation permits continuous charging of solid material (2) such as steel scrap into a reaction vessel (1) such as a converter for steel manufacture, the steel scrap being heated by heat exchange with the gases (G) emitted from the converter. To this end, the scrap (2) is fed into a compartment (3) provided with a discharge opening placed above the mouth (6) of the converter (1) from which the hot gases (G) are emitted, the scrap (2) is displaced towards the discharge opening (5) and the hot gases (G) are aspirated so as to circulate through the scrap (2) in countercurrent flow with respect to the direction of displacement (D) of the scrap.

Abstract: A telescopic hood seals the coupling between the top of an oxygen converter and the stack during the melting and refining of iron in the converter.

Abstract: There is disclosed an installation with a refractorily lined metallurgical vessel. The vessel, on its upper end, is provided with a mouth that is connectable to a chimney arranged at a distance above the mouth, by a hood insertable between the mouth and the chimney. In order to provide an installation with which the lining team is not jeopardized and by which it is possible to introduce the lining material into the metallurgical vessel in a simple and time-saving manner, a container is introduceable into the space present between the mouth and the chimney after the removal of the hood. The container covers the chimney downwardly and includes at least one closeable bottom opening. The carrying means for introducing the container is equipped with at least one hoist displaceable from laterally beside the mouth of the vessel to above the mouth of the vessel.

Abstract: A method and apparatus are disclosed for the sintering of an ore using gaseous fuel. A layer of noncombustible particulate mineral material is arranged on a supporting grate, and hot fumes derived from gaseous fuel are passed downwardly through the layer of material. The temperature of the hot fumes is sufficient to initiate fusion or sintering of the mineral material. Predrying, sintering and cooling means are provided along the length of the supporting grate in order to effect the desired sintering.

Abstract: A converter for refining liquid metals having a cylindrical horizontally disposed vessel (1) with a first opening (6) for charging and pouring and a second opening (13) circumferentially and longitudinally displaced from the first opening for exhaust gases to escape, is disclosed. The circumferential displacement is sufficient to prevent liquid metal from pouring from the second opening (13) when the vessel is rotated from a first position for charging materials into the vessel (1) through the first opening (6) to a second position for pouring the contents of the vessel (1) from opening (6). Cool air is provided to a region between the vessel (1) and a jacket (15) surrounding the vessel (1). A hood (14) collects the exhaust gases from the second opening (13) in any position to which the vessel (1) is rotated when it is used. End and circumferential seals structures are provided where hood (14) longitudinally and circumferentially contacts jacket (15).

Abstract: A hood assembly for use with a metallurgical converter is disclosed. The hood assembly comprises a hood resting on a supporting structure and having sidewalls the lower ends of which extend downwardly to a short distance from the apron plate of the converter and around a portion of the periphery of the converter corresponding to the angular movement of the mouth of the converter from the blowing to the charging position, and the upper ends of which follow a curve-linear or straight path extending from the upper back end of the hood until it meets with the lower ends of the sidewalls at the front of the hood, and a roof bridging the sidewalls except for an opening at the front of the hood extending over the mouth of the converter in the charging position.

Abstract: Apparatus for treating molten metal comprising a ladle for containing a molten metal to be treated having an upper edge, a hood arranged above the ladle and comprising a heat shield essentially covering completely the ladle and having a ceramic lining facing the molten metal in the ladle, with the heat shield and the upper edge of the ladle being spaced from each to define a gap between the heat shield and the upper edge of the ladle. A screen forms and all-enveloping roof over the heat shield and extends over and below the gap to define a circumferential opening between the screen and the ladle below the gap, and spacing means extending between the screen and the heat shield are provided for maintaining the screen and the heat shield spaced apart with respect to each other to define a chamber between the screen and heat shield.

Abstract: Apparatus for controlling emissions from the cast house of a blast furnace system includes hood means covering the iron trough from the blast furnace, the hood means having a hatchway formed therein adjacent to the blast furnace discharge notch and closed by a vertically-removable hatch cover which is raised and lowered by cables which extend upwardly over sheaves carried by a yoke assembly mounted on the bustle pipe immediately above the iron trough and then to a remote winch. Means are provided on the yoke assembly for latching the latch cover in its raised position.

Abstract: A device for filtering dust from air drawn by apparatus from a factory shop or building, for example a steelmaking shop, including a plurality of dust extractors which have a total capacity at least equal to the air throughput of the drawn air. The extractors have regulators by which they can be regulated individually or in groups. Preferably each extractor is associated with an individual dust extractor and also each extractor preferably has its own individual cleaning system. The extractors are preferably of the dry filter bag type.

Abstract: A thermal recuperator for heating gas supplied to a vessel from which a hot gas is discharged and which allows the pressure in the vessel to be controlled substantially without regard to the pressure drop necessary to cause the hot gas to flow through the recuperator. The invention has particular utility in the case of a metallurgical ladle provided with a ladle heater, the combustion air for which is heated in a recuperator receiving waste gas from the ladle. A conduit for the waste gas leaving the ladle is surrounded by one or more conduits for the combustion air, and an ejector fed with combustion air is arranged at the gas outlet of the waste gas conduit to accelerate the waste gases and facilitate their egress from the recuperator.

Abstract: An apparatus for separating metallic zinc from zinc-containing residues includes a tank which is coolable by the flow of air through a helicoidal conduit that is open radically to the outside via upper and lower orifices and formed within a chamber surrounding the tanks internal refractory coating. A radial flow of molten material against the tank walls is produced by the driven blades of a paddle wheel. Air is supplied to the tank via an air intake in the closure cover. An upper annulr chamber around the cover's seating communicates with the tank's interior via the cover and has an external orifice for connection of a suction conduit.

Abstract: A plasma melting furnace includes a cover and a melt container. Through its side wall plasma burners arranged so as to be inclined towards the furnace axis are guided. A main flue gas conduit equipped with a draft regulating damper is connected to the cover and a separate discharge means for flue gases from other furnace openings is additionally provided. In order to provide an efficient discharge of flue gases and reaction gases forming as well as dusts and fumes without straining the furnace hall and the environment, and to maintain a protective gas atmosphere in the furnace interior safely during all the necessary working cycles, the separate discharge means is designed as a downwardly open channel. The channel is peripherally attached to the outer side of the container in the region of the upper rim of the melt container.

Abstract: An apparatus for the handling of converter gases, especially the storage thereof, comprises a hood which fits over the mouth of a steel making converter and is connected by a duct and blower to a storage vessel. According to the invention, between the blower and the storage vessel, a cruciform junction is provided with the lower upwardly extending stretch being connected to the discharge side of the blower, the upper upwardly extending stretch being connected to a flaring pipe, one horizontal stretch being connected to the storage vessel and the other horizontal stretch to a bypass to the flaring pipe. Valves are provided for controlling the flow such that only the valuable gas is stored.

Abstract: An enclosure for a metallurgical vessel has a front access door to permit movement of charging devices into the enclosure for charging the metallurgical vessel disposed therein. A gas collector is mounted in the upper end of the enclosure, a first hood mounted in the enclosure for movement between an operative position above the vessel and an inoperative position remote from the vessel. When in its operative position, the hood is disposed in coupling engagement with one side of the gas collector. A second hood is fixedly coupled to the other side of the gas collector. Dampers are disposed between each hood and the gas collector.

Abstract: A method for refining of steel melts for production of steel, especially stainless steel, with extremely low oxygen content is characterized in that a powdered non-oxidic earth alkali metal compound or alloy is injected by means of a non-oxidizing carrier gas, preferably an inert gas, into a well de-oxidized steel melt which is covered by a basic reduced slag in a metallurgical ladle, whereby at least a significant amount of the earth alkali metal is oxidized by the oxygen dissolved in the melt to form small particles of earth alkali metal oxide, of which some are separated out to the slag cover while the remaining portion of the earth alkali metals stays behind in the melt in elementary form or combined in the form of particulate earth alkali metal oxide in colloidal solution, and that then powdered earth alkali metal oxide is injected, whereby there latter, larger oxide particles function as nucleus forming agents for the continued reaction between earth alkali metals dissolved in the melt and oxygen, and a

Abstract: A sound and dust insulating wall separates the furnace hall from the casting hall in a metallurgical mill. In order to allow the transport of an overhead crane from one hall to the other, an upper wall portion of the separating wall pivots out of the way. The wall portion comprises frame elements and a plurality of relatively thin overlapping slats. The wall portion is opened by pivoting the frame elements about a horizontally extending hinge. The slats, secured to the frame elements by hinges, also pivot, so that the slats only block the now opened crane passageway by not more than the width of one individual slat.

Abstract: The invention relates to a method and equipment of producing with good reproducibility steel which is extremely free from slag inclusions, particularly steel with low sulphur content and thus very low contents of sulphidic slag inclusions, starting with a steel melt which is decarburized in a melting furnace, converter or the like to the desired carbon content, after which subsequent refining is carried out by an injection method in a ladle.

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: A changeover device for an installation for recovery of the gases proceeding from a tilting converter placed in an enclosure connected to a fixed suction duct called the main suction duct. The main suction duct enables recovery of the gases which escape from the converter in the vertical position for blast. A secondary duct connected to one and the same suction device as the main duct enables the recovery of the gases in the converter in the inclined position for charging. The changeover device enables the suction to be exerted either in the main duct or in the secondary duct. It comprises a suction chamber having two superposed portions connected by a vertical junction duct projecting into the upper portion of the chamber. Around the junction duct there is a tank containing water. A vertically movable bell plunges into the tank in order to isolate the two portions of the chamber with respect to one another.

Abstract: A lance for use in a basic oxygen vessel is provided with a fluid cooling arrangement which is mounted directly on the lance structure and which is vertically adjustable therewith to provide a fluid spray which effectively enables and ensures cooling and suppression of the exiting gas before it contacts the hood and moves into the ducts of the hood structure.

Abstract: In a cast house of a blast furnace, one or more movable exhaust hoods, connected to exhaust ducts, are provided for extraction of gas and dust. In order to provide such a hood which is easily moved manually by the operating personnel but which, with its duct, nevertheless does not unduly obstruct the working space, the hood is carried by a swivellable duct section which is connected to a fixed duct section at its swivelling axis and is supported, in cantilever fashion, by a bearing, e.g. a ball bearing, which is located outside the duct and extends circumferentially around the duct.

Abstract: An apparatus for preheating steel scrap comprises: a preheating vessel, having an open top and a bottom lid capable of being opened and closed, for receiving and preheating steel scrap, said preheating vessel being adapted to receive steel scrap to be preheated from said open top and to discharge the steel scrap preheated in said preheating vessel by opening said bottom lid; a hood downwardly flaring for covering said open top of said preheating vessel, said hood being movable from said open top of said preheating vessel and adapted to introduce high-temperature waste gases discharged from a steel-refining metallurgical furnace into said preheating vessel; a pit for housing said preheating vessel, said pit being provided with a duct for discharging to the outside said waste gases discharged into said pit from the bottom of said preheating vessel after preheating said steel scrap received in said preheating vessel; and, a canopy for sealing the gap between said pit and said preheating vessel housed in said pit

Abstract: Method and apparatus for suppressing formation of pollutants in a blast furnace casting system by occluding oxidizing gases, including ambient air, from the molten iron and slag discharged from the furnace.

Abstract: Method and apparatus for determining when the cast of a blast furnace is substantially completed in a blast furnace cast system wherein direct viewing of the taphole is obstructed during the cast. In a system wherein viewing of the taphole is obstructed by hood means covering the iron trough, substantial completion of the cast may be determined by sensing changes in ambient conditions, e.g., a change in temperature within the hood means, vibration of the hood, and/or a change in the color of the flame generated at the discharge end of a slag runner.

Abstract: An improved smoke exhaust apparatus for a rotary welder which comprises an elongated stationary carrier having a support member mounted thereon for rotation about an upright axis. Plenum and shroud elements are vertically spaced apart and are connected to such support member for rotation therewith. The plenum is provided with intake and exhaust ports. The shroud includes a horizontally disposed plate having a depending skirt around a portion of the periphery thereof to provide an opening in the side of the shroud. Smoke inlet ports are provided in the plate and tubes connect the smoke inlet ports to the respective intake ports whereby suction applied to the exhaust ports of the plenum causes flow of air from the interior of the shroud upwardly through the smoke inlet ports, the tubing and intake ports and into the plenum from which such flow passes outwardly of the exhaust ports.

Abstract: An iron blast furnace casting cage is provided comprising an enclosure for substantially surrounding a blast furnace tap hole and auxiliary equipment and having means defining an upper wall portion disposed above said tap hole and auxiliary equipment and a side wall portion extending generally downwardly from said upper wall portion, an access means in said side wall, an exhaust opening formed in one of said wall portions, said upper and side wall portions adapted to be disposed in a closely surrounding relation to said tap hole, auxiliary equipment and the floor of the cast house, and exhaust means extending from said exhaust opening for withdrawing pollutants generated in said cage.

Abstract: Hot pipes are tempered in an oil bath contained in a tapered, covered pan; a flap is temporarily opened for feeding, but closed when oil vapor develops, to be sucked off without contaminating the environment. Pan and cover structure are supplemented to prevent uncontrolled escape of vapor during treatment. Different handling devices for pipes in the interior of the pan are described.

Abstract: A method for recovering unburnt exhaust gases in an oxygen converter, characterized by the control of an exhaust gas damper by a control signal obtained by signal-processing, in accordance with the set functional formulae, an exhaust gas damper control signal obtained from a pressure differential between throat pressure and atmospheric pressure, and an exhaust gas damper prediction control signal obtained by continuously detecting the quantity of oxygen fed, the quantity of secondary raw material charged, the composition of exhaust gases and the flow rate of exhaust gases to calculate the quantity of furnace generated gases and the quantity of combustion exhaust gases at throat.

Abstract: A method and apparatus for making steel in a basic oxygen furnace installation, in which water is sprayed from a central location within and at the open end of an exhaust hood 12 outwardly toward the inside hood surface to cool the hood and wet the off-gases during a blow. A ring-like spray manifold 22 is supported on an oxygen lance 14 for automatic insertion to the proper location in the hood, for removal with the lance, and for automatic operation concurrently with the supplying of oxygen.

Abstract: In an arrangement for capturing and conducting away flue gases forming during charging of, and pouring off from, metallurgical vessels in a steel-making plant, the material to be charged and poured off is brought into and out of the operating position by a container displaceable by means of a crane. The crane trolley is designed to form a displaceable unit with a hood having a draft opening. The hood, in the operating position, covers the container and the mouth of the metallurgical vessel, and the draft opening borders on the discharge opening of a chimney so as to form a flow connection therewith.

Abstract: A method of controlling a process off-gas system by generating a model of the input to the system as a function of the gas generating inputs to the process vessel served by the off-gas system and feeding forward this flow representation as the set point for a feedback flow control loop for the downstream off-gas system fans. The feed forward signal is trimmed by a process off-gas pressure feedback loop which when applied to a TBRC off-gas system assures a minimum flow of leakage air to prevent puffing. The flow control feedback loop employs a mass spectrometer to provide on line computation of the true off-gas flow at the fans. Since the input model can be generated as a simple linear function of the SCFM of the gas generating inputs to the process, the flow control loop is operated on the same basis although it can also be operated on the basis of mass flow.

Abstract: Pneumatic seals are provided at the seams about movable doors of the containment enclosure for a metal processing converter to prevent leakage of undesirable effluent to the atmosphere. The seals incorporate members on the doors and the adjacent enclosure structure which, when the doors are closed, define labyrinth passages for conducting clean air from an elevated pressure source to discharge simultaneously into the enclosure interior and to the atmosphere. The invention contemplates, as an alternative, connection of the passages to a low pressure source effective to withdraw the effluent leakage for discharge into a receiver.

Abstract: A converter arrangement includes a tiltable converter vessel surrounded by a casing on whose ceiling a principal discharge conduit for conducting away refining gases, and a secondary discharge conduit for conducting away the smoke forming during charging and pouring, are connected. One side wall of the casing has an opening closeable by a door. The casing is widened in the tilting direction of the converter and a car carrying a charging container is movable into the widened space through the opening in the side wall. The opening can be completely closed when the car is in the moved-in position during charging and pouring off.

Abstract: This invention relates to a fluid closure for preventing gaseous and particulate material from flowing through an opening in a fluid confining structure, and more particularly relates to a fluid curtain for sealing a lance port in a gas collecting hood for an oxygen steelmaking furnace.

Abstract: A pipe curtain is formed by a plurality of pipes independently suspended at one end portion to an outwardly extending flange positioned around a pollution control hood positioned at the discharge of a metallurgical furnace. Molten metal is transferred from the furnace to a metal transporting vessel through a trough, spout or the like. The hood is positioned above the trough and fans for the hood draw emissions, such as gaseous and particulate pollutants emitted from the molten metal, into the hood. The vertically suspended pipes are positioned in close relation to each other and substantially enclose the space between the bottom edge of the hood and the upper edge of the trough. With this arrangement the pipes form a curtain that prevents the air entrained pollutants emitted from the molten metal from escaping out from beneath the hood to the surrounding atmosphere.

Abstract: In a converter plant including a tiltable converter surrounded by a casing to whose ceiling a principal discharge conduit for conducting away refining gases is connected, part of the casing is fastened to a charging device and is displaceable with the same. The charging device is designed as a portal crane displaceable in the direction of the tilting axis of the tiltable converter. A cellular casing part is fastened to the portal crane, is open towards the tiltable converter and has a gas-discharge opening in the ceiling. The remaining casing part is closed, and the cellular part, in the charging position and, if desired, also in the pouring-off position, closes the casing and the discharge opening lies below an additional discharge conduit for conducting away secondary emissions.

Abstract: A hood-like chamber over a converter vessel for refining pig iron, affords the collection of exhaust gases from the vessel and the direction of the gases into an exhaust gas line. The chamber is formed by a top wall containing an opening into the exhaust gas line, and side walls extend downwardly from the top wall. The lower ends of the side walls are located above the bottom of the vessel. A flange extends inwardly from the lower end of the side walls into contact with a collar extending radially outwardly from a support ring encircling the vessel. A seal can be provided between the flange and the collar to prevent the passage of air between them into the chamber. Alternatively, a gap can be left between the flange and the collar to admit a certain amount of secondary air into the chamber.

Abstract: A movable emissions control hood is mounted for insertion between a fixed emissions processing hood and the open mouth of a converter vessel of a metallurgical furnace to capture emissions from the converter vessel and convey them into the existing emissions processing hood when the converter vessel is rotated to the charging position. The movable hood cooperates with the converter vessel structure to effectively limit the admission of air and gases except from an area above the open mouth of the converter vessel.

Abstract: Apparatus for manufacturing steel includes a hood adapted to be connected to the mouth of a converter. The hood has at least one conduit opening into it for introducing secondary materials into the hood. In order to arrange monitoring points of the pressure within the hood cheaply and conveniently, the pressure-measuring points are incorporated into the upper sides of the conduits. Each conduit may also have a connection which enables it to be flushed out with an inert gas, thus preventing a dangerous build up of inflammable gases within the conduit.

Abstract: A plant for refining pig iron by means of oxygen or gases enriched with oxygen has a chamber accommodating a converter and having an upper part, a lower part, a ceiling, a principal hood connected to the ceiling, a closeable charge opening, and a secondary hood provided in the upper part of the chamber, with this chamber the principal hood forms a displaceable unit with a part of the ceiling surrounding it, the secondary hood is united with a stationary part of the ceiling, and the charge opening is closeable by a sliding door guided on rails.

Abstract: A lance for use in a basic oxygen vessel is provided with a fluid cooling arrangement which is mounted directly on the lance structure and which is vertically adjustable therewith to provide a fluid spray which effectively enables and ensures cooling and suppression of the exiting gas before it contacts the hood and moves into the ducts of the hood structure.