Abstract: A device for immobilising the spout on the ends of the trunnions, in a charging installation for a shaft furnace comprising a pivoting material distribution spout (1), the spout being connected to the supporting trunnions (2) by lugs (11) which engage in receptacles (21) formed in the trunnions and which are immobilised therein by pins (3) comprising at their end an eccentric nipple (31) engaging with a lug of the spout to hold the lug immobilised at the bottom of its receptacle, and locking means (4) for rotationally locking the pin.

Abstract: In a process for melting metal chips, the process being of the type that uses a charge system for delivering the metal chips to a melt furnace, and of the type that uses a pre-treatment system for drying the metal chips, the improvement comprising the step of capturing an exhaust stream from the charge system, where the exhaust stream includes hydrocarbons, and combusting the hydrocarbons to produce heat that is utilized in drying the chips.

Abstract: A cutting machine waste extraction apparatus is provided for a cutting machine that cuts a plate where the cutting machine waste extraction apparatus is supported adjacent a cutting area at a cutting table. The cutting machine produces waste at the cutting area during the cutting of the plate where the apparatus includes a ducting system having a first duct that receives the waste from the plate, and a second duct that receives the waste from the first duct. The first duct is movable along the length of the second duct and the second duct includes a lengthwise opening which is sealed by a flexible belt. The flexible belt is deformable from sealed contact with the second duct, adjacent a junction apparatus, where the junction apparatus provides a fluid connection between the first duct and the second duct.

Abstract: A positioning apparatus (100,100?,100?) for steelmaking lances (300) of an electric arc furnace (200) comprising:—a supporting structure (150,150?) for a steelmaking lance intended to be introduced into said furnace (200) through an opening (230) of said furnace—a linkage (110;120;130;160) associated to said supporting structure (150,150?) and intended to position a carriage (115) linearly movable with respect to said linkage (110;120;130;160) wherein said linkage (110;120;130;160) is an articulated quadrilateral intended to cause said at least one steelmaking lance (330) to be moved from a parking position outside said electric arc furnace to an operating position wherein at least a part of said lance is inside said electric arc furnace and said positioning apparatus (100,100?,100?) further comprises rotation means to cause at least said carriage (115) to rotate about an axis (X) substantially vertical in the assembly condition.

Abstract: Apparatus for pre-heating and conveying a metal charge to a container of a melting plant, comprising at least a conveyor channel along which said metal charge is able to advance so as to be delivered to the container, and in which above said conveyor channel at least a hood is disposed which defines a tunnel inside which at least part of the fumes exiting from said container are able to advance. At least a zone of the hood comprises an expansion chamber located above at least a portion of said metal charge, and able to expand and keep said fumes inside it for a minimum desired time of at least 1.5 seconds before they go into contact with the metal charge.

Abstract: A melt metallurgical installation has a melting furnace for melting scrap metal and a charging region for the melting furnace which is located above the melting furnace. The installation further has a charging element, which has been filled with scrap metal intended for the melting furnace and can be moved in a movement direction into the charging region where it can be emptied and then moved again, in the empty state, against the movement direction out of the charging region. The charging region is enclosed by a hood such that the charging region, including the charging element which has been placed in the charging region, is closed at the top and on the sides. The hood has at least one upper extraction opening through which the waste gases and dust developing in the hood can be extracted out of the hood.

Abstract: A system for controlling emissions of gas and dust during transfer of a hot feed material from a movable transfer container to a stationary feed bin of a furnace. The system includes an upper duct section which is associated with the movable transfer container, and a lower duct section associated with the feed bin. The lower duct section is attached to a main collection duct with a dust collection fan. The two duct sections are brought into close proximity with one another when the transfer container is brought into position for discharge to the feed bin, so as to form a continuous gas passage throughout the duct sections.

Abstract: A method of processing materials at multiple work sites that prevents contamination of the atmosphere. The method includes providing a plurality of work sites containing workpieces, positioning a track connecting the sites, providing a mobile system comprising an enclosure and a treatment system in communication with a space enclosed by the enclosure, moving the mobile system so that the enclosure surrounds the workpieces on the first site, processing those workpieces, moving the mobile system along the track as a single unit onto a second work site, and processing those workpieces on the second site. The enclosure may be readily openable at opposing portions facing the track to enable the enclosure to pass over workpieces on the plurality of work sites. Additionally, a method of constructing an operation for processing workpieces is provided.

Abstract: A track-based mobile system for use with processes generating air-borne pollutants, for preventing contamination of the atmosphere. An enclosure for containing air-borne pollutants and a filtering system for removing the pollutants from the air are movable as a unit along a track for use at a plurality of worksites. The unit is openable at opposing portions facing the track so as to be able to pass over workpieces at the plurality of work sites. The filtering system includes intake tubes, and dampers to enable the selection of air-flow patterns within the enclosure.

Abstract: An apparatus and method for capturing the emissions from a controlled atmosphere treatment apparatus of the type having at least one, and usually several, controlled atmosphere zones therein and exhaust stacks that deliver environmentally unfriendly emissions therefrom. Nozzles are attached to the exhaust stacks from the various controlled atmosphere zones in the treatment apparatus. The nozzles accelerate the exhaust flow from the exhaust stacks, provide a means for measuring the flow from the exhaust stacks, yet maintain the mass flow rates from the exhaust stacks at predetermined levels. The flow from the nozzles is directed through closed conduits to an optional filter and an exhaust fan that provides suction to draw the exhaust flow through the nozzles.

Abstract: An arrangement for pouring a pourable melt made up of a copper alloy, which comprises a melting furnace, pivotable about a horizontal pivot axis, having a pouring tube which discharges pourable melt and through which the pourable melt can be conveyed under a shielding gas atmosphere to a filling end of a launder and can be conveyed through an outlet of the launder to a mold. The filling end of the launder is coverable by a hood that seals off the pourable melt from the atmosphere, the pouring tube engaging, with interposition of a seal arrangement, in pivotably movable fashion into the hood. As a result, the pourable melt can be transferred into the launder under a shielding gas atmosphere upon pivoting of the melting furnace and the pouring tub.

Abstract: A direct smelting vessel which is adapted to contain a molten bath of metal and slag is disclosed. The vessel includes an off-gas duct that has: (a) a first section which has a relatively slight upward inclination to the horizontal from an inlet end of the first section; and (b) a second section which extends upwardly from an upper end of the first section at a relatively steep inclination to the horizontal.

Abstract: A converter plant with a sealing ring provided between the hood of a tiltable converter and the mouth of a smoke gas flue, drives are provided, for moving the sealing ring can be moved so far away from the converter hood that the converter can be tilted without obstruction. At the same time, the sealing ring is designed as a sleeve which surrounds the smoke gas flue from outside. The mouth of the sleeve is capable, in the closing position, of leaning against the converter hood the and the sleeve has vertical severing cuts which divide the sleeve into at least two segments.

Abstract: System to plug the roof of an electric arc furnace having a main chamber or melting volume arranged below the roof and at least one electrode introduced into the main chamber, the system comprising an upper element or auxiliary roof element arranged on the top of the roof and shaped so as to define an inner chamber and at least a central aperture through which the electrode can be moved, the auxiliary roof element consisting of a plurality of pipes inside which a cooling fluid circulates under pressure.

Abstract: Aspiration system to reduce the losses of fine materials and powders from an electric arc furnace having a lower hearth suitable to contain the bath of metal material being melted, a substantially cylindrical chamber arranged above the hearth, at least one electrode arranged in a central zone of the chamber and a roof arranged to cover the chamber and provided with at least one aperture through which the fumes produced by the bath can exit, the system comprising a first aspiration sub-system arranged inside the chamber and at least another discharge sub-system arranged in correspondence with the roof, the first aspiration sub-system comprising a coil of cooling pipes arranged helical so as to define, in a vertical direction, empty zones between the spirals of pipes, the coil of cooling pipes being distanced from the cylindrical wall of the chamber to define a peripheral interspace through which the fumes can ascend towards the roof according to at least an ascensional, rotatory vortex.

Abstract: The invention is directed to water-cooled furnace hoods that exhaust gases away from a work area, and in particular, it is directed to an off-gas hood for use with a basic oxygen furnace (BOF). The furnace hood includes an assemblage of panels fastened together to form a flue positioned above a BOF at a location to receive gases generated by the furnace. Each panel includes an inlet header for receiving cooling water, an outlet header for discharging cooling water, and a plurality of tubes, such as a tube-bar-tube membrane, extending between the inlet and outlet headers to distribute cooling water between the headers. Jumper pipes extend between outlet headers and inlet headers located in adjacent panels. The jumper pipes distribute cooling between adjacent panels and thereby provide a continuous flow of cooling water along the length of the flue. The invention is also directed to a method of replacing the panels located in the assemblage of panels that make up the flue.

Abstract: Disclosed is a tundish assembly having fume collection provisions. The tundish assembly includes a tundish, a tundish cover, and a tundish hood. The hood has provisions for connecting the assembly to a vacuum source or other air moving means to thereby draw fumes or gases from the interior of the tundish out through the hood.

Abstract: A torch cutting and fume collecting enclosure is disclosed that is particularly adapted for the collection of lead-containing fumes and gases emitted during cutting of steel strands. The enclosure comprises a plurality of walls and two flexible barriers disposed on opposite ends of the enclosure, one at a receiving end, and the other at an output end of the enclosure. The enclosure further comprises a unique air handling system comprising one or more collector hoods, ducts and plenums for collecting and moving air and other gas flows from the enclosure for subsequent treatment and/or discharge. The air handling system utilizes a unique tapered configuration for one or more plenums that reduces the tendency for particulates to separate from an air or gas flow.

Abstract: An apparatus and technique for collecting fumes from a metallurgical vessel such as a ladle are disclosed. The apparatus and technique are particularly well suited for collecting fumes during a cleanout operation of one or more discharge ports along the bottom of the vessel when the vessel is inverted on its side.

Abstract: A water-cooled multipart hood for metallurgical vessels, particularly pouring ladles, with cooling tubes arranged welded tube against tube and/or with gaps between the tubes, with an opening arranged in the cover of the hood for inserting a refractory core piece for guiding electrodes therethrough, and with openings for discharging flue gases. The water-cooled ladle hood further includes a lower outer hood and a lower inner hood with at least three gas exhaust openings and a gas conducting pipe arranged in the lower outer hood, wherein an upper hood with at least three gas exhaust openings, a gas conducting pipe and an opening is arranged in the lower inner hood.

Abstract: An improved dumping bay particularly adapted for preventing the escape of hazardous fumes into other areas of a facility is disclosed. The dumping bay is fully enclosed and utilizes a unique air flow routing technique for collecting fumes, such as from a ladle during a slag dumping operation.

Abstract: A comprehensive fume collection system, particularly adapted for the collection of lead-containing fumes or gases typically emitted during the manufacture of leaded steel, is disclosed. The preferred fume collection system comprises four sections, each serving a particular portion of the steelmaking process--(i) a casting floor fume collection system, (ii) a ladle slag dumping fume collection system, (iii) a tundish cooling fume collection system, and (iv) a torch cutting fume collection system.

Abstract: A metallurgical vessel cover having integral fume collection provisions is disclosed. The cover features a plurality of inlet openings defined about the perimeter of the cover that direct fumes or other gases residing around the exterior of the cover, through the interior of the cover, and to a single collection region. There, the fumes or gases are discharged through a shroud, which preferably is connected to an attachable venting duct. The cover also features an internal configuration for reducing heat transfer through the cover.

Abstract: Fume intake and cooling device for intake conduits (11,111,211) in electric arc furnaces (26a,26b), comprising a containing structure (28) associated at one end (12) with an aperture on the roof of the furnace and connected at the second end (13) with an intake and filter system (27), the containing structure (28) having, in cooperation with its inner sidewalls, cooling means, the cooling means comprising a pipe (14), which is spiral shaped and has turns (16) lying on a plane substantially at right angles to the longitudinal axis of the conduits (11,111,211), the turns (16) being distanced with respect to each other in such a way as to form interstices (20) between adjacent turns (16), the interstices (20) through which the fumes pass serving to anchor the slag.

Abstract: An aluminum remelting furnace for recycling scrap. In order to prevent atmospheric dispersion of toxic substances from the combustion of aluminum scrap contaminants, the furnace includes a loading chamber positioned on the upper wall of the furnace which is provided with a lower door and an upper door. During loading, the lower door is opened while the upper door remains closed to prevent the escape of the contaminant substances which remained enclosed within the loading chamber. After closing the lower door, the contaminant substances are fed to a post-combustion chamber and then to a gas treatment and purification system.

Abstract: A dross press is enclosed within a cabinet which is normally maintained at a negative pressure relative to ambient air pressure. The cabinet is provided with locked doors to prevent egress of explosive gases or pieces of metal. The cabinet is also equipped with safety vents at a high level to prevent destruction of the cabinet by internal explosions. The cabinet also is provided with a fan for extracting fumes therefrom. The fan is connected to a purifier to treat the extracted fumes and air inlet holes in the press head so that the fan may draw air through the head for cooling.

Abstract: A method and apparatus for incinerating waste material and in particular, for incinerating particulate material resulting from the shredding of vehicles. The particulate material is fed to one end of a rotary drum, and is subjected in the drum to pyrolitic incineration in the absence of air, to generate combustible gases and a solid residue. The combustion gases and the residue are discharged from the drum to a discharge hood, where the solid residue is separated from the gases. The gases are then passed through a condenser to cool the gases to a temperature below 212.degree. F. to thereby condense water vapor and higher boiling point hydrocarbon gases to produce hydrocarbon liquid.

Abstract: A cover is provided for a launder, or an equivalent open-topped vessel for containing molten metal, the cover including a heat-insulative layer spanning the open top of the vessel, with a spacer arrangement to maintain a gap of uniform width between the heat-insulative layer and the open-top. A housing defines an evacuation plenum, and connections are made to allow an exhaust device to remove gaseous materials from the plenum. Adjacent the gap is an air-guide arrangement which directs outside air into the evacuation chamber along a path which is intercepted by any gaseous materials exiting through the gap, whereby such gaseous materials are entrained into the evacuation chamber.

Abstract: Apparatus for producing molten pig iron by direct reduction of iron ore, comprises(i) a metallurgical vessel, in which with supply of coal and oxygen the iron ore undergoes a final reduction with production of a process gas and said process gas undergoes a partial post-combustion, and(ii) a melting cyclone in which the iron ore undergoes a pre-reduction and is melted. To improve the control of the thermal flows and to reduce maintenance, the vessel has(a) a top part, in which the partial post-combustion of said process gas takes place, in the form of a pressure-resistant hood having an interior wall comprising cooling water pipes, and(b) a bottom part for accommodating an iron bath having a slag layer in which said final reduction of said iron ore takes place, the bottom part having an internal refractory lining and means for water cooling the internal refractory lining.

Abstract: A method and apparatus for blanketing the surface of material, e.g. molten metal contained in an open top vessel, e.g. induction furnace, by establishing a swirling flow of an inert gas having a density greater than air at the top of the vessel. Inert gas exits the swirl flow through an opening in a flow controlling apparatus having an exit opening with a diameter that is smaller than the base diameter of the swirl adjacent the open top vessel.

Abstract: In a filter dust melting furnace, the waste gases occurring in the interior (9) of the furnace are conducted outward through a waste-gas line (5) in the furnace top. Provided in the course of the waste-gas line is a quench (20) for the abrupt cooling of the waste gas by cold quenching air acting on it. To prevent deposits in the waste-gas line, the quench (6) is arranged in the section of the waste-gas line (5) which directly adjoins the furnace vessel (1) and extends essentially vertically, and means are provided for cooling the quench and the section of the waste-gas line (5) located downstream after the quench.

Abstract: Molten (M) is poured into a receiver (8,28) designed to reduce fume and then out into an open area (P) via an outlet (9,29) designed to cause the metal (M) to flow in a laminar flow. A hood (11) may be present above the receiver (8,28).

Abstract: A system and process for treating dust and sludge from iron and steel making operations and includes separating iron and carbon from zinc and lead. Separation is performed in a series of hydrocyclones associated in a series-parallel fashion, The iron and carbon is recycled within the iron making operation without detriment to furnace liners, Lime and flocculent are added to the lead and zinc to create a stable material suitable for landfill disposal, Sludges are consumed by injection onto a sinter strand.

Abstract: The furnace includes a vessel closed by a floating roof, and a sealing means mechanism between the roof and the vessel. The sealing mechanism includes two joint surfaces, one of which is arranged on the peripheral edge portion of the roof whereas the other is arranged on the peripheral edge portion of the vessel. The first surface is substantially toric and the second surface substantially frustoconical. The joint surfaces permit the centering of the roof relative to the axis of the vessel. The peripheral edge portion of the vessel is provided with a coping element on which one of the joint surfaces is arranged.

Abstract: A smelting unit having a furnace vessel (11) which is mounted on a furnace rocking cradle (13) and which can be closed by a cover (12), and bar electrodes (28) which can be lowered into the furnace vessel (11) and which can be raised and lowered by means of electrode lift devices (30), in which the electrode lift devices (30) are carried by a portal assembly (31). In a lowered position the portal assembly (31) lies on a support holder (33) of the vessel substructure (14) or the furnace rocking cradle (13) respectively and in that position can be tilted with the furnace vessel (11). It can be released from the furnace vessel (11) and pivoted to the side by a lift post (43) of a stationary lifting/pivoting mechanism (40). When the unit has two vessels which are arranged side-by-side, the bar electrodes can be associated alternately with one vessel or the other by means of the lifting/pivoting mechanism (40).

Abstract: Hood assembly for pneumatic process metallurgical vessel, such as BOF, which includes removeable spray cooled sub-assemblies at predetermined locations in the hood assembly.

Abstract: The invention is directed to a gas tight lance closing device at a cooling chimney hood for steel converters. An opening is provided in the cooling chimney for a jetting lance, which latter can be raised and lowered. The diameter of the opening is dimensioned in such a way that an annular gap remains between the inner edge of the opening and the outer circumference of the jetting lance. In order to close the chimney opening toward the lance so as to be gas tight and to enable operation at an internal overpressure of more than 0.

Abstract: A ladle arrangement intended for use when treating a metal melt, in which gas or gas/powder mixture is delivered to the melt (2) which substantially fills the ladle (1), and departing gases are extracted by suction through a hood mounted above the ladle. The inventive ladle arrangement is effective to permit the gas or gas/powder mixture to be delivered to the melt in a large volumetric flow, wherewith the melt will bubble and splash vigorously. For the purpose of restricting the effects of these melt splashes to a defined space above the melt (2), the gas extraction hood has the form of a lid (7) which is intended to substantially seal against the upper edge of the ladle (1). The lid is configured so that the volume (6) defined by the lid above the melt will correspond to a substantial part, preferably at least half, of the volume of the melt (2) in the ladle (1). The side surfaces of the lid (7) define splash droplet pathway operative to return the droplets to the melt in the ladle.

Abstract: Utilization of metal chips, especially scrap metal chips, particularly brass and aluminum, by introduction of the metal chips into a pool of molten metal of which they are formed or an alloy thereof, with minimization of fuel cost, heat loss, and minimal conversion of the metal at the surface of the molten metal pool to metal oxide, as well as an increase in the yield of utilizable metal from the remelting or recycling operation, by maintaining a non-oxidizing atmosphere at the surface of the molten metal pool and optionally utilizing vaporized residual impurities from chips being recycled such as oil, lacquer, or similar vaporizable impurity to assist in maintaining the non-oxidizing atmosphere, thereby permitting elimination of impurity-removal steps previously required for preparation of the chips for recycling by introduction into such a molten metal pool, and thereby also conveniently and simultaneously substantially reducing environmental pollution from vaporizable contaminants, fumes, and decomposition

Abstract: A furnace bottom structure of a direct current electric furnace has at least one furnace bottom electrode and at least one gas injection tuyere provided in the furnace bottom refractory of the direct current electric furnace. Preferably, the furnace bottom electrodes and the gas injection tuyere are embedded in a substantially cylindrical refractory body with downwardly diverging tapered upper portion. The refractory body, the furnace bottom electrodes and the gas injection tuyere form an integral furnace bottom block which is detachably attached to the bottom of the electric furnace so as to close a bottom opening of the furnace.

Abstract: An electroslag remelting plant includes an ingot mold 4 for forming a block from remolten material, at least one consumable electrode 26, a body having at least one vertically driven electrode rod 20 for the advance of the consumable electrode and a hood 33 disposed above the ingot mold which has at least one concentric opening toward the respective electrode axis. In order to limit the volume over the slag the following is provided: The hood 33 is, with respect to its vertical axis "A", subdivided into laterally movable sectors 34, 35 each of which is, at a first sealing joint 41, gas-tight connected with its lower edge 40 to top of the ingot mold 4 as far as possible and with its upper edge 39, at a second sealing joint 42, gas-tight sealed as far as possible with respect to the electrode rod. Further, the hood 33 has an interior of such cross section and height that, in its most elevated position, the top end of the at least one consumable electrode 26 is below the second sealing joint 42 of the hood 33.

Abstract: Steel casting ladles present at different locations are supplied alternately with one heating system for all of the steel casting ladles. The heating system including current bearing heating cables is arranged on a wheelable platform which in turn is present on a swivel stage. For supplying the ladles the rotary motion of the swivel stage is combined with the to-and-fro motion of the wheelable platform.

Abstract: A method and apparatus is disclosed for direct reduction of metal oxides, using a rotary kiln, fed with greenball pellets, the kiln having a feed-end and a discharge end. A first chamber within the kiln, and adjacent to the feed-end, is used for drying, preheating and indurating the greenball pellets. Greenball pellets are fed into the first chamber using a conventional mechanism. The feed-end is sealed to prevent egress of process gas from the kiln into the atmosphere and ingress of the atmosphere into the kiln. A first burner is used for drying, preheating and indurating the greenball pellets within the first chamber. A second chamber within the kiln, adjacent to and connected with the first chamber, having a diameter greater than the first chamber, is used for reducing the pellets, the second chamber being adjacent to the discharge end. A second burner may be used for reducing the pellets within the second chamber. Reduced pellets are discharged from the discharge end.

Abstract: A ladle slagging stand includes a tilting arrangement supporting a ladle, a slag vessel, and a slagging slide scumming the surface of the melt in the ladle placed on the tilting arrangement. In order to be able to seize all the gas and dust emissions forming during the slagging procedure, both the tilting means and the slagging slide, and the slag vessel are surrounded by a casing into which a suction duct enters. The casing includes at least one closable opening for introducing and removing the ladle and the slag vessel.

Abstract: A system for cooling non-ferrous metal dross comprises an open-top metal pan to receive the dross which pan is divided by internal partitions into open-top compartments and has sufficient heat capacity to act as a heat sink to absorb heat from the dross, and a hood shaped to fit over the pan when filled with dross to form a substantially closed cavity round the pan. An inert gas such as argon is introduced into this cavity to displace oxygen and reduce the extent of oxidation of residual metal in the dross.

Abstract: In order to ensure that flue gases will not escape from an enclosure (1) which contains a metallurgical vessel (2) as charging boxes (10) are moved into and out of the enclosure, the charging crane (14) is disposed inside the enclosure (1) and the enclosure contains at least one lock chamber (11), which is adapted to contain a charging box (10) in a stand-by position and which adjoins a charging opening (9) that is formed in a side wall (5) of the enclosure. A top wall of the lock chamber is formed with an opening (12), which is adapted to be closed and through which a charging box can be moved between the lock chamber and the main part of the interior of the enclosure.

Abstract: A metallurgical plant comprises a tiltable metallurgical vessel (1) and an enclosure surrounding said vessel. The vessel is provided with a cover (6), which is adapted to be lifted and to be horizontally pivotally moved away from the vessel (1) so as to permit the vessel to be charged by means of a charging box (5), which is suspended from a charging crane disposed outside the enclosure. To simplify the access to the metallurgical vessel (1) and substantially to prevent or minimize an escape of flue gas from the enclosure, a charging opening (8) which is adapted to be closed, is formed in the enclosure in a side wall (2) thereof which extends transversely to the horizontal axis about which the vessel (1) is tiltable, and the enclosure is formed in its top wall (4) with a top wall opening (11), which opens into the charging opening (8) and extends from the latter in the direction of said horizontal axis and is adapted to receive the crane ropes (10).

Abstract: An installation for evacuating emanations in the taphole region of a shaft furnace (e.g. blast furnace) of the type having a blast connection arrangement around the furnace bosh, together with a blast connection stage or platform for the inspection and servicing of the blast connections, and in which the molten metal is periodically tapped with the aid of tapping means and run off through a main tapping runner or spout includes the feature wherein a portion of the blast connection platform is adapted to be tilted away in the upward direction. This tiltable platform portion, when in its untilted position forms, together with vertical side walls which extend from the two side ends of the platform portion, a flue-like exhaust duct for the emanations produced directly in the taphole region. The present invention further comprises a movable exhaust hood connected to a stationary suction line and a mobile tapping spout hood having at the top an exhaust opening situated under the exhaust hood.

Abstract: A tundlish lid is described comprising a steel baseplate and refractory insulating layer. The refractory insulating layer has embedded in it a lattice, preferably of iron or steel, which is secured to retaining members themselves secured to one surface of the baseplate. By this means the refractory insulating layer adheres well to the baseplate. A method of making the tundlish lid is also described by positively securing the lattice in spaced relation from the surface of the baseplate by securing the lattice in slots in studs or retaining elements secured to the baseplate and then applying a layer of substantially uniform thickness of refractory insulating material over the lattice.

Abstract: A converter pressure control device for use in a converter waste gas disposing device wherein a calculator determines the difference between the pressure in a converter and atmospheric pressure and sets an operating parameter according to the detected difference. A pressure controller generates a control signal in accordance with the operating parameter and the difference in converter pressure and a predetermined value. The control signal is used to operate a damper to control the flow of waste gas through the converter.