Abstract: In accordance with the present invention, there is provided a treat chlorine bypass dust while preventing increases in chemical cost and concentrations of heavy metals in clinker, and ensuring stability in quality of cement. In a chlorine bypass facility 1 extracting a part G of combustion gas, while cooling it, from a kiln exhaust gas passage, which runs from an inlet end of a cement kiln to a bottom cyclone, and recovering a high chlorine concentration chlorine bypass dust D5 from the extracted gas G1, a slurry S containing chlorine bypass dust and SO2 gas or/and CO2 gas are contacted with each other to obtain solid content. The slurry containing chlorine bypass dust and an exhaust gas from the chlorine bypass facility or/and the exhaust gas from the cement kiln can be contacted with each other, and the solid content can be fed to a cement finishing process, which allows cement with low CaO and Ca(OH)2 contents and with stable property such as setting time to be produced.

Abstract: A furnace for melting and/or gasifying material, comprising a housing for temporary enclosure of said material, a supply opening through said housing, heating means, a discharge opening through said housing, a gas outlet through said housing, wherein said housing is mounted tiltable around a horizontal axis, said supply opening extending coaxially with said horizontal axis, and the discharge opening being mounted in a wall of the housing so that said melted material can be removed from the housing by tilting the furnace about said axis.

Abstract: The present invention provides a shaft high temperature continuous graphitizing furnace comprising a furnace body comprising a feeding inlet and a discharging outlet, an electrode pair, a cooling system and a discharging device; the furnace body is designed to be a shaft cylindrical structure; the electrode pair is provided within the furnace body and comprise an upper electrode and a lower electrode, the upper electrode is located below the feeding inlet, and an umbrella or cone table shape electric field having a lower cross section area greater than its upper cross section area arises between the upper electrode and eh lower electrode; and the cooling system is located between the lower electrode and the discharging outlet.

Abstract: A melting furnace includes a waste inlet formed on a first side wall of the plasma melting furnace to feed waste therein, an exhaust gas outlet formed on a second side wall facing the first side wall and located diagonally to a direction orthogonal to the first side wall having the waste inlet to discharge the exhaust gas generated in the plasma melting furnace, and a plasma torch mounted on a third side wall for heating inside of the plasma melting furnace at a position nearer to the second side wall than the first side wall so as to inject a plasma into the exhaust gas.

Abstract: This slag-supplying container of an electric furnace for reduction processing of steel-making slag includes: a container body that causes hot steel-making slag to flow to the electric furnace; a slag discharging portion connected with an electric-furnace-side slag-supplying port; a slag receiving portion that receives the hot steel-making slag supplied; a lid that opens and closes the slag receiving portion; an exhausting portion that discharges exhaust gas from the electric furnace; and, a tilting unit that tilts the container body to adjust the amount of inflow of the hot steel-making slag to the electric-furnace-side slag-supplying port.

Abstract: A method of recovering energy from an electric induction furnace exhaust gas in the gasification of feed fuel to exhaust gas. Melt of an electrically conductive material, which is disposed within electric induction furnace, is pressurized while substantially sealing the electric induction furnace to enable the build-up of a superatmospheric pressure in said furnace. A feed fuel is injected into contact with at least a portion of the melt of electrically conductive material. Exhaust gas generated at a superatmospheric pressure is withdrawn from said furnace and scrubbed and stored for subsequent use in a gas accumulator. The total calorific value of the exhaust gas from the gas accumulator that is available for use by a gas consumer device is measured and estimated.

Abstract: The present invention relates to a roof for a ladle furnace which can be compatible with a dust collection elbow or with a dust collection hood. The roof according to the present invention includes a side part (102) which has a vertical cylindrical shape, and a cover part (104) which covers an upper end of the side part. A first seating hole (110) is formed in a central portion of the cover part, and a second seating hole (112) is formed in the cover part at a position adjacent to the first seating hole. A small ceiling (160) or a dust collection hood (170) is selectively seated into the first seating hole. A dust collection elbow (180) or a water cooling panel (190) is selectively seated into the second seating hole.

Abstract: Disclosed herein is a melting apparatus for melt-decontaminating radioactive metal waste. The melting apparatus includes a melting furnace, a high frequency generator, a ladle, a bogie, a cooling unit and a dust collector. The melting furnace includes a crucible into which the metal waste is input, and an induction coil which is wound around the crucible to melt the metal waste. The induction coil has a hollow hole in which cooling fluid flows. The high frequency generator applies high-frequency current to the induction coil. The ladle supplies molten metal, from which slag has been removed in the crucible, into molds. The bogie is disposed adjacent to the ladle and is provided with the molds, each of which forms an ingot using the molten metal supplied thereinto. The cooling unit cools the cooling fluid and circulates it along the induction coil. The dust collector filters out dust and purifies gas.

Abstract: A furnace damper control system and method thereof including a furnace having at least one opening through which electromagnetic radiation from within the furnace may be sensed, an exhaust duct capable of receiving an exhaust gas stream emerging from the furnace, and a controllable damper capable of adjusting the pressure in the exhaust duct. A sensor is capable of sensing electromagnetic radiation through one or more of the openings of the furnace and generating a sensor signal corresponding to the electromagnetic radiation, and a processor is capable of processing the sensor signal and generating a monitoring signal responsive to a parameter of the electromagnetic radiation indicative of furnace emissions. A controller is capable of controlling the damper responsive to the monitoring signal indicative of the furnace emissions.

Abstract: A method of processing electric arc furnace dust includes the steps of preheating a portion of electric arc furnace dust to a temperature of at least 170 degrees centigrade by convection heating to form a preheated dust. The preheated dust is further heated by microwaves until a zinc in the preheat dust vaporizes to form a metal vapor and a residue. The metal vapor is then condensed.

Abstract: A method of operating an induction furnace so as to receive electric arc furnace (EAF) dust, basic oxygen furnace (BOF) sludge/dust and/or other iron and volatile metals containing materials as a feed stream on a batch, continuous or semi-continuous basis together with a iron-containing material feed, and therefrom produce an iron-containing hot metal or pig iron product while recovering iron value from the feed materials and recovering volatile metal components contained in the feed materials.

Abstract: A fume extraction system includes a combustion zone coupled with an exhaust outlet of a furnace to receive an exhaust gas stream emerging from the furnace outlet during system operation, where the exhaust gas stream includes explosive gases that undergo combustion reactions within the combustion zone. A duct section is aligned downstream from the combustion zone to deliver the exhaust gas stream toward a venting outlet. A suction unit establishes a negative pressure within the system so as to draw the exhaust gas stream from the furnace outlet and through the fume extraction system during system operation. An exhaust damper is further provided within the system between the combustion zone inlet and the suction unit. A control system selectively controls the negative pressure applied to the furnace, combustion zone and duct section based upon a measured concentration of at least one gas constituent within the exhaust gas stream.

Abstract: A roof (3) for a metallurgical ladle/furnace (L.A.F) (1) comprising a self-supporting structure of metallic pipework (4) defining at least one flow circuit for cooling water, with a lower end having a circular peripheral flange (A), with a cylindrical body member (c) of smaller diameter than the flange (A) located above the flange (A) (in use away from the ladle/furnace), and is provided with an end wall (14) having a plurality of apertures (14) each to receive, in a gas-tight manner, a carbon electrode (8), and an aperture (5) for fume extraction provided in the arcuate wall (16) of the cylindrical body member.

Abstract: The present invention provides a system and method for collecting fumes from an arc furnace of the type typically used in metal foundries. The system provides an electrode hood with extended sides for improved collection of fumes from the vicinity of the electrodes. It also provides a movable spout hood for collection of fumes when metal is tapped. The furnace is tilted when metal is tapped. A tilting duct is connected to provide a path for emissions drawn into the hood on the furnace. The tilting duct moves with the furnace. A stationary duct leads to the bag house. The tilting duct and stationary duct meet at an interface and have facing openings that maintain a path for collecting fumes throughout the entire range of motion of the furnace. The stationary duct has a group of dampers that open and close as the furnace tilts to limit air intake to the portion of the stationary duct opening that is adjacent the tilting duct opening.

Abstract: An environmentally controlled heating system for heating metal alloy billets wherein a trolley system carries the billets through the chambers of the induction heating system in crucibles that are pushed or pulled by actuators. The billets enter the system through a load-chamber and travel through a main chamber to a heating area where the loaded crucibles pass through a series of induction heating coils. The heated billets leave the heating area through a dump-chamber where they are delivered to a forming system. The empty crucibles reenter the main chamber and travel back to the loading area to receive another billet. The heating system is controlled through a computing device for monitoring and controlling the system, preferably a programmable logic controller. A vacuum system evacuates air from the chambers, and an inert gas system back-fills the chambers with an inert gas. A gettering system continually cleans the inert gas.

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: An electric arc gasifier adapts to the variable chemical components of waste products by utilizing mobile and fixed electrodes and a positioning system wherein a waste is injected into a heating chamber and broken down into elemental components capable of being recycled. A primary injection is heated by an electric arc formed between two electrodes. A secondary fluid consisting of the waste and a carrier gas is then injected and mixed with the heated primary fluid. A reaction zone within the fixed electrode of the heating chamber accelerates a resulting mixture of gases, solids, and liquids into a mixing chamber, wherein the resulting high-temperature, high pressure mixture may be combined with a tertiary spray. An efficient destructive rate stemming from the high temperature plasma formed by the electric arc allows for low cost waste processing and a means for recovering high value metals.

Abstract: Method to process fumes performed on fumes discharged directly from furnaces (10) through an aperture (11) in their roof or from loading baskets (13) used to pre-heat scrap which is to be loaded into a furnace, the fumes (17) afterwards being sent to a purification plant (24) and to a chimney, the fumes (17) leaving the furnace (10) and/or the loading baskets (13) through a cooled conduit (14) being made to pass through at least a first transit chamber where they are subjected to a post-combustion process before being sent to the purification plant (24) and the chimney, the first transit chamber being a first expansion chamber and the fumes entering the first expansion chamber (15a) expanding in correspondence with a wider section (215a) therein at the entrance thereto and being deflected by a deflector element (18) arranged substantially at the center of the wider section (215a), the expansion and deflection causing the fumes to decelerate from a speed at the inlet of around 20 to 50 meters per second to a s

Abstract: An electro-smokeless extraction/recovery system for converting shredded scrap tires to carbon black and steel and fluid discharge of oil, gas and solvent chemicals. A reaction vessel is formed with a side wall and a bottom plate. The bottom plate is provided with a plurality of heat apertures and a plurality of drain apertures. The vessel also has an open top for receipt of waste and shredded scrap tires. The lid is adapted to be removably placed over the top. A plurality of electrical heating elements are positioned through the bottom of the reaction vessel to heat the waste and shredded scrap tires within the vessel. A plurality of hollow drain members each have a side wall and a top with an open bottom positioned in sealing relationship with drain apertures. Vertically extending openings on at least a portion of a side wall extend upwardly from the bottom plate to a location adjacent to the top to effect the flow of fluid discharge from the reaction vessel.

Abstract: A method for providing main gas into a pool of molten metal, which is particularly useful for use in an electric arc furnace. The method employs combustion of secondary oxygen with fuel to form a flame envelope around a main gas stream which protects the main gas from entrainment of ambient gases as it passes through the headspace of the furnace. This enables the gas to retain to a substantial degree its original force upon injection into the headspace and thus may be injected into the furnace at a safe distance from the molten metal surface while still achieving substantially complete penetration into the molten metal.

Abstract: An oxygen injector for a post combustion system used in an electric arc furnace includes a housing formed of a concave configured front wall and a spaced rear wall. The housing has a width greater than the spacing defined between the front wall and spaced rear wall. An oval configured conduit wall is located medially in the housing and extends from the rear to front wall to form an oval configured oxygen chamber and a water chamber with the oxygen chamber bound internally by the conduit wall. Orifices are formed in the front wall within the oxygen chamber.

Abstract: A method of melting an incineration residue includes steps of: charging an incineration residue containing salts into a melting furnace; heating the charged incineration residue in the melting furnace to produce a melt which includes a molten slag layer and a molten salt layer on the molten slag layer; controlling a temperature of the molten salt in the molten salt layer; discharging the molten slag from the melting furnace; and discharging the molten salt from the melting furnace.

Abstract: An arc furnace fume collection system has a plurality of duct lines leading to a common duct that leads to a baghouse for filtering dust. The supplemental duct lines have high pressure fans, blowers, or compressors and join one of the other duct lines through a nozzle. The nozzle connection acts as a venturi to supplement the pulling power of a common exhaust fan downstream of the baghouse filter.

Abstract: The present invention reduces generation of harmful substances through processing at lower cost for facilities and processing. According to the present invention, polychlorinated biphenyl and mixture of alumina oxide and silicon dioxide are mixed and emulsified in an ultrasonic emulsifier 2. The emulsified mixture is then charged into an electric resistance type melting furnace 5 and is melted at temperature of 1500.degree. C.-2000.degree. C. and is turned to glassy state.

Abstract: An electric arc furnace comprises a closed melting vessel and includes means for charging metal to be molten into the melting vessel. At least one electrode extends into the melting vessel and generates an electric arc and forms a molten metal bath. At least one oxygen lance can be extended into the melting vessel for injecting oxygen into the molten metal bath and create a reaction where the carbon monoxide is generated. Gas is exhausted from the melting vessel and the carbon monoxide gas concentration of the exhaust gas is measured. A post combustion chamber receives the exhaust gas and provides post combustion of the exhaust gas. Post combustion oxygen is injected into the melting vessel in an amount sufficient to provide post combustion based on the amount of oxygen necessary for post combustion of the exhaust gas and the post combustion chamber.

Abstract: A melting furnace for the thermal treatment of special waste materials containing heavy metal and dioxin is provided. The melting furnace includes a main furnace vessel, the main furnace vessel having a melting end for receiving a melt, and a gas chamber above the melt. The melting furnace further includes at least one charging device for supplying a product to be treated, at least one gas outlet, and at least one discharge chamber, the at least one discharge chamber being separated from the main furnace vessel by a separating wall and being connected to the melting end by a siphon, the at least one discharge chamber having a gas chamber above the melt. At least one first heater projects into an interior of the main furnace vessel, and at least one second heater is provided in the at least one discharge chamber.

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: A preheating and melting apparatus for scrap, for preheating and melting the scrap highly efficiently, includes a scrap melting furnace having a top blowing lance and an electric arc heater and a preheater for introducing an exhaust gas generated from the melting furnace and preheating the scrap. The scrap preheater is a shaft furnace and a rotary furnace is disposed at the bottom portion of the shaft furnace to continue the shaft furnace. The scrap discharged from the shaft furnace is transferred into the rotary furnace and it is then charged into the scrap melting furnace.

Abstract: A method for providing main gas into a pool of molten metal, which is particularly useful for use in an electric arc furnace. The method employs combustion of secondary oxygen with fuel to form a flame envelope around a main gas stream which protects the main gas from entrainment of ambient gases as it passes through the headspace of the furnace. This enables the gas to retain to a substantial degree its original force upon injection into the headspace and thus may be injected into the furnace at a safe distance from the molten metal surface while still achieving substantially complete penetration into the molten metal.

Abstract: A furnace system for preventing gas leakage is disclosed. The furnace system includes a bottom board for holding a furnace tube. A gas injection device is connected to the furnace tube at a first port for injecting reaction gas into the furnace tube. An exhaust subsystem is connected to the furnace tube at a second port. The exhaust subsystem has a first node, a second node, a third node and a fourth node. A vacuum seal is connected to the furnace tube at a third port for preventing the exhaust gas from leaking. The vacuum seal is connected to the exhaust subsystem at the first node and the second node. Finally, an N.sub.2 sealing tube is connected to furnace tube and surrounding the seam between the furnace tube and the bottom board.

Abstract: A Deglor furnace includes heating elements each having a heater rod being surrounded by a protective tube. The protective tube is mounted on a ceiling of the Deglor furnace and is run through an opening in the ceiling into the interior of the Deglor furnace. Heat insulation of the ceiling which borders the opening is protected against corrosive gases from the interior by a shield.

Abstract: An exhaust device to suck in the fumes in an electric arc furnace (11) fed either by direct or alternating current. The furnace (11) comprises a crown (20) with at least one aperture (19) to introduce and position the electrodes (12) associated with a cupola, in a vertically raised position, which surrounds the electrodes (12) partially in a vertical direction. The cupola is smaller in diameter than the crown (20), there being included a fourth hole connected to the discharge pipe for the fumes (14). The cupola functions as a decantation chamber (13) substantially cylindrical in shape. The cupola functioning as a decantation chamber (13) including at its upper part a conduit (15) to discharge the fumes projecting tangentially and connecting the cupola functioning as a decantation chamber (13) to the discharge pipe (14), placed at the side of the cupola (13).

Abstract: To improve operation, particularly to allow more universal use, in which both liquid and solid crude metal, especially iron can be refined in only one reactor vessel, a reactor vessel (1) is of converter-like design with a relatively large space above a melt (7) and with slag (8) lying above said melt. For the removal of slag (8) via a closable slag channel (18'), the meltdown apparatus can be rotated about a center of rotation (20) through .+-.8.degree.. For the complete removal of the melt (7) via a closable melt channel (17') in the bottom region of the meltdown apparatus, the latter can be rotated about a center of rotation (19) through .+-.30.sup.. A magnetic coil (16) fed with direct current and arranged around the meltdown apparatus (1) serves for the magnetic damping of movements of melt (7) and/or slag (8) inside the meltdown apparatus. In the converter mode, a graphite electrode (5) used in the arc mode is replaced by a gas supply conduit, through which oxygen is then supplied under pressure.

Abstract: A Deglor furnace includes a ceiling and at least one heating module integrated into the ceiling for heating. The heating module has an electric heater.

Abstract: An air pollution control process and apparatus for glass furnaces for use in the furnace's waste gas outlet including passing the waste gases through a spray type neutralization tower to remove sulphates in the waste gases by spraying an absorbent (NaOH) to reduce the opacity of exhaust gas, and employing a pneumatic powder feeding device to feed flyash or calcium hydroxide periodically in a path between the spray type neutralization tower and a bag house to maintain normal functioning of the filter bag in the bag house.

Abstract: A preheat system for a furnace comprising a preheat vessel on a rotating turret and a receiving chamber for conditioning furnace off-gases prior to use in preheating.

Abstract: A method for carrying out post combustion in an electric arc furnace comprising forming a preferential gas stream within the electric arc furnace, concentrating carbon monoxide within the gas stream, and providing post combustion oxygen into the gas stream where the carbon monoxide is concentrated.

Abstract: An aluminum melting method wherein an atmosphere above the aluminum charge is comprised of two strata, a lower strata covering the aluminum charge comprised of a non-oxidizing gas and an upper strata comprised of combustion gases from one or more burners. Heat from the burner or burners radiatively heats and melts the aluminum while the lower strata protects the aluminum from oxidative effects which would result if the aluminum surface were contacted with the combustion gases, thus serving to reduce dross formation.

Abstract: Smeltable dust and pieces of grate slag in the proportions in which they are produced by a garbage incinerator can be disposed of by simultaneously melting them in a low-shaft electric furnace having at least one electrode extending into a molten slag bath which is maintained in the furnace covered by a layer of coke. The dust is introduced below the coke layer by a lance or tubular electrode while the pieces of grate slag are introduced above the molten slag both. The proportions of the two are maintained so that the leachate from the solidified slag when deposited in a landfill, conforms to the statutory requirements of clean drinking water laws.

Abstract: The ash melting furnace disposes the combustion ash resulted from incineration of municipal or other sorts of waste by melting it utilizing as the main fuel the unburnt carbon contained in the ash itself. The ash melting furnace includes a stationary plasma torch which uses air for the working gas, and which is so placed facing the combustion ash heaped up within the furnace as to project its hot gas jet thereon. The furnace further includes a torch unit controller that actuates the plasma torch to secondarily heat and melt the ash.

Abstract: Dust like substances which are recovered from a garbage or refuse incinerator are destroyed, eliminated or disposed of by smelting in a low shaft electric furnace having at least one electrode heating a slag melt therein. The dust is introduced into the melt by a lance opening beneath the melting surface and gas produced by the smelting process is subjected to cleaning. The slag may be continuously or discontinuously withdrawn and slag formers may be compensatorily added. A metal bath consisting predominantly of iron may be provided below the slag melt to protect metallic components of the dust upon the smelting thereof.

Abstract: A method and apparatus for reducing the production or emission of noxious gases while continuously preheating a mixture of iron-bearing scrap charge materials for an electric steelmaking furnace operation with off-gas from, the furnace, including provision for controlled combustion within the preheating chamber. Removed gases are then treated by thermal incineration of combustible residual matter before release into the atmosphere to insure that no noxious gases are emitted.

Abstract: A smoke suction duct of an electric furnace is constructed as a separate member from other exhaust duct portions and other devices and is supported to be rotatable about an axis of the duct. Further, the smoke suction duct is either alternately turned to right and left or continuously turned in one direction by a duct turning device. Since accumulating dust is raised to an upper portion of the smoke suction duct where an exhaust gas flow has a high velocity due to rotation of the smoke suction duct and is pushed toward a combustion tower by the exhaust gas flow, dust is advantageously prevented from accumulating on a bottom of the smoke suction duct.

Abstract: During melting in an electric melting furnace of iron products such as pig iron, scrap iron, directly reduced iron pellets, and various alloy metals, or mixtures of the foregoing having greatly varying impurities, solid carbon dioxide is led over the melting hearth shortly before, during, and after charging. Explosive burning of the combustible constituents is thus prevented in that the oxygen is displaced during the charging operation by the expanding gaseous carbon dioxide produced. The method makes possible electric steel production with reduced accumulation of dust and fumes in that formation thereof is largely eliminated directly at the source. By cutting down on the high volumes of gas and gas temperatures occurring during charging without carbon dioxide, substantially smaller filter installations are needed, whereby the amount of savings on investment and operating costs economically compensates for the cost of the carbon dioxide utilization.

Abstract: An induction crucible furnace with a tiltable furnace body includes a crucible that is usually covered by an accessible furnace platform. The furnace platform is sonically uncoupled from the furnace body in an untilted normal position, in order to reduce sound intensity radiated by the furnace platform. Coupling elements, which effect a change of state between a very loose coupling or a complete uncoupling in the normal position and a close or rigid coupling in a tilted position of the furnace body, are provided between the furnace body and the furnace platform. The coupling elements can be spring elements, lug and bolt connections, lug and bolt and lug connections or lug and locking bolt connections.

Abstract: A process for treating hazardous particulate generated during a manufacturing process is provided. The process includes the steps of: passing particulate material through at least one duct toward a waste collection device; feeding an additive into the duct to be mixed with the particulate material, upstream from the waste collection device; and passing the particulate material mixed with the additive into the waste collection device. A scrap remelting apparatus is also provided.

Abstract: This is an improved electrode for consumable vacuum arc melting of zirconium and titanium alloys, for alloys containing a low melting point alloying material or for very low oxygen zirconium. Electrodes of this type use a low resistance spar extending substantiallly the length of the electrode, with this spar being substantially free of any unalloyed low melting point material. The improvement utilizes attachment by wedging of the external members to the spar core. Preferably the wedging is accomplished by rotation of the external member with respect to the spar core.

Abstract: Toxic compounds, entrained in water, are dissociated in an electric arc (e.g. 12000.degree. F.) in an airtight chamber charged with oxygen; metal ions (M.sup.+) resulting from dissociation are recombined as gaseous oxides (MO.sub.x) which are educted from the chamber and disposed of.

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: An arc furnace installation wherein the arc furnace is air-tightly enclosed with a shroud and a scrap preheating chamber moves into or out of the shroud in such a way that the preheating chamber may be selectively brought to a position immediately above the arc furnace, a scrap preheating position spaced apart from the arc furnace by a predetermined distance and a scrap charging position outside of the shroud. The number of openings of the shroud may be reduced to a minimum and consequently the total area of the openings may be minimized.