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| Number | Title | Issue Date |
| 7426230 | Sealed device for preventing exhaust gas leakage A device that prevents exhaust gas leakage during movement of an electrode in an electric furnace. An electrode holder is attached to the electrode. An actuator moves the electrode between first and second positions within an aperture formed in an upper portion of t... | 09/16/2008 |
| 7027481 | Method and electric furnace for melting vitreous materials A method and apparatus for melting vitrifiable materials employs a melting tank for containing a molten bath with an upper surface. The tank has a floor and side walls and channels for discharging molten materials. A crown is situated above the floor and vitrifiable... | 04/11/2006 |
| 6952446 | Digital filter bank followed by monobit receivers for signal processing The present invention uses narrow-band monobit receivers after a digital filter bank to separate simultaneous signals in one channel. The invention improves the capability of wideband digital receivers. ... | 10/04/2005 |
| 6748004 | Methods and apparatus for improved energy efficient control of an electric arc furnace fume extraction system 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 r... | 06/08/2004 |
| 6570906 | ARC furnace with DC arc and AC joule heating An arc furnace that utilizes a combined DC arc system and an AC joule heating system to melt the waste disposed therein and to keep the waste material in a molten condition. The DC arc system utilizes the AC joule heating electrodes as part of the DC curr... | 05/27/2003 |
| 6535543 | Device to take in fumes and cool the roof of electric furnaces Device to take in fumes and cool the roof (10) of electric furnaces. The device has a central aperture (11) into which an electrode can be inserted and a peripheral aperture (12) to take in and discharge the fumes. The device also has a first cooling syst... | 03/18/2003 |
| 6490312 | Direct-current arc furnace comprising a centric charging shaft for producing steel and a method therefor A direct-current arc furnace for producing steel has a smelting vessel with electrodes, tapping openings for the molten mass and slag, and a device for a direct removal of exhaust gases. The smelting vessel is extended upwardly by a central shaft for intr... | 12/03/2002 |
| 6438154 | Method and apparatus for recovering metal values from liquid slag an baghouse dust of an electric arc furnace An apparatus and method for processing liquid slag and baghouse dust from a steelmaking furnace such as an EAF to recover valuable metals from the slag and dust includes a treatment vessel having a movable lower shell portion for receiving liquid slag and... | 08/20/2002 |
| 6424671 | Process for making steel A process for making steel in an electric arc furnace includes providing a molten charge which is a melt composed of a high carbon ferrous metal in the electric arc furnace by one of preparing the melt in the furnace or introducing the melt into the furna... | 07/23/2002 |
| 6418157 | Roof for a metallurgical ladle/furnace 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 bod... | 07/09/2002 |
| 6400747 | Quadrilateral assembly for coherent jet lancing and post combustion in an electric arc furnace A quadrilateral assembly in an electric arc furnace wall for providing one or more coherent jets into the furnace and for providing preferably a plurality of post combustion oxidant streams into the furnace, preferably for forming a post combustion oxidan... | 06/04/2002 |
| 6347110 | Charging device for low blast furnaces A feeding device for low shaft furnaces, in particular for arc furnaces for melting scrap, it being possible for the furnaces to be closed by a cover connected to a gas-extracting device, and it being possible for a charging apparatus to be set down on th... | 02/12/2002 |
| 6301285 | Arc furnace fume collection method 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 ... | 10/09/2001 |
| 6219371 | System to plug the delta area of the roof of an electric arc furnace 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 th... | 04/17/2001 |
| 6175584 | Aspiration system to reduce the losses of fine materials and powders from an electric arc furnace 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 on... | 01/16/2001 |
| 6173002 | Electric arc gasifier as a waste processor 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... | 01/09/2001 |
| 6163561 | Cooled basket for steel plants Basket to manipulate scrap in cooperation with an arc furnace (11) and with means to pre-heat the scrap by means of the fumes from the fourth hole (14), the basket being able to be associated with a movable covering system (16) and including a containing ... | 12/19/2000 |
| 6163560 | Method to process fumes and relative device 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 pu... | 12/19/2000 |
| 6081545 | ARC furnace improved fume collection 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 thr... | 06/27/2000 |
| 5999558 | Integral spray cooled furnace roof and fume elbow Spray cooled roof assembly for a metallurgical vessel, e.g. an electric arc furnace, comprising two spray cooled components, one of which covers a major portion of the furnace, and the other component of the roof assembly having an integral spray cooled e... | 12/07/1999 |
| 5999556 | Electric arc furnace that uses post combustion 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 le... | 12/07/1999 |
| 5987051 | Arc furnace fume collection system and method 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 ... | 11/16/1999 |
| 5956365 | Electric arc furnace having slag door and post combustion process An electric arc furnace comprises a closed melting vessel and includes a roof through which metal to be molten is charged into the melting vessel. At least one electrode extends into the melting vessel and generates an electric arc and forms a molten meta... | 09/21/1999 |
| 5943360 | Electric arc furnace that uses post combustion An electric arc furnace includes a closed melting vessel and includes an opening that can be closed where metal to be molten is charged into the melting vessel. At least one electrode extends into the melting vessel and generates an electric arc and forms... | 08/24/1999 |
| 5926498 | Melting furnace for the thermal treatment of special waste materials containing heavy metal and/or dioxin 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 ... | 07/20/1999 |
| 5905752 | ARC furnace fume collection system and method 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 ... | 05/18/1999 |
| 5787108 | Exhaust device for electric arc furnaces and relative method 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 cup... | 07/28/1998 |
| 5748666 | Method and furnace for treatment of ash A method and a d.c. arc furnace for thermal treatment of an ash, wherein reducing conditions are established within a closed and sealed furnace, the ash is supplied via a channel arranged in an electrode which extends towards a metal melt in a furnace she... | 05/05/1998 |
| 5680413 | Electric arc melting furnace An electric arc melting furnace includes a furnace shell (1) with an electrode (3) for melting scrap by heat of arc, an air blasting port (20) for blasting air, oxygen or oxygen-enriched air into the furnace shell (1) through an air control valve (19), a ... | 10/21/1997 |
| 5590150 | Electric arc melting furnace An electric arc melting furnace comprises a furnace shell (1) with an electrode (3) for melting scrap by heat of arc, an air blasting port (20) for blasting air, oxygen or oxygen-enriched air into the furnace shell (1) through an air control valve (19), a... | 12/31/1996 |
| 5574746 | Melting furnace for thermal treatment of special wastes containing heavy metals and/or dioxin A melting furnace for thermal treatment of heavy metal-containing and/or dioxin-containing special wastes, including a clog preventing system including a principal furnace vessel, which exhibits a melting tank for holding a melt; at least one feeder for f... | 11/12/1996 |
| 5572544 | Electric arc furnace post combustion method 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 strea... | 11/05/1996 |
| 5566200 | Process and device for disposal of filter materials A process and low-shaft furnace for disposing of filter material. The material to be disposed of is charged via a charging device onto and/or into a slag bath in the furnace. Simultaneously, additives comprising fluxing agents, slag-making constituents an... | 10/15/1996 |
| 5541952 | Apparatus and method of preheating steel scrap for a twin shell electric arc furnace Apparatus and methods of abating the objectionable emissions of volatile hydrocarbons generated during the preheating cycle of a twin vessel electric arc furnace steelmaking operation wherein the vessels cycle between a powered or melting state and an unp... | 07/30/1996 |
| 5535234 | Process for the simultaneous smelting of dust and incinerator slag 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 bat... | 07/09/1996 |
| 5533043 | Installation for producing liquid metal by melting scrap iron An installation for the production of liquid metal by melting a charge of ferrous material, comprising at least one electric melting furnace consisting of a chamber closed by a removable roof and associated with consumable electrodes for melting the charg... | 07/02/1996 |
| 5500870 | Process and device for the extraction of valuable substances A process and melting furnace unit are provided for extracting valuable substances by reducing oxygen-bound metals which process includes exposing a charge in a first reaction zone of a furnace vessel to heat energy so that a liquid slag floats on a metal... | 03/19/1996 |
| 5493580 | Process for recycling the filter dust in an electric arc furnace for producing steel The present invention relates to a process of recycling filter dust obtained during the production of steel in an electric arc furnace. Filter dust is injected and mixed with the smalls of carbon containing material in the slag or at the interface between... | 02/20/1996 |
| 5487081 | Process and apparatus for the treatment of the waste gases of an arc furnace A process is provided for the treatment of waste gases, dust and vapor from a closed arc furnace disposed in a furnace vessel. The furnace vessel contains a charge column, a metal melt and slag arranged in the lower portion of that vessel. The charge colu... | 01/23/1996 |
| 5467365 | Process for the recovery of lead arising especially from the active material of spent batteries, and electric furnace intended especially for the use of the process An electric furnace (containing an immersed electrode) and a process for the recovery of lead, arising especially from solid residues. Fines, which are a product of physically crushing spent batteries, are melted under not very reducing conditions in the ... | 11/14/1995 |
