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| Number | Title | Issue Date |
| 8021602 | Hearth carriage coupling structure of rotary furnace hearth A rotary furnace hearth wherein a hearth carriage carrying a hearth comprises a plurality of hearth carriages respectively having propulsion systems, wherein adjoining hearth carriages are coupled by coupling bolts and nuts via spacers interspaced in a single row in... | 09/20/2011 |
| 7655181 | Screw conveyor of rotary hearth furnace for discharging reduced iron A reduced iron discharging screw conveyer is provided in a rotary hearth furnace and discharges reduced iron out of the rotary hearth furnace. The rotary hearth furnace produces the reduced iron by charging and heating a pellet including metallic oxide and coal mate... | 02/02/2010 |
| 7497985 | Charging device, especially charging stock preheater To facilitate a trouble-free charging of scrap metal having differing constitutions, such as light and heavy scrap metal, from a lower discharge opening of a shaft-shaped charging device or a charging stock preheater (1) into a melting vessel by a pusher (... | 03/03/2009 |
| 7473393 | Method for discharging reduced product from a movable-hearth furnace and a discharging device A method for discharging a reduced product produced on a movable hearth of a movable-hearth furnace uses a discharging device. The discharging device includes a removal unit for removing the reduced product from the movable hearth, a separation unit for separating t... | 01/06/2009 |
| 7204689 | Seal structure of solid feeding screw, and method of manufacturing reduced metal using the seal structure A sealing structure for a solid-transferring screw installed inside a heating furnace such as a material-leveling screw and a product-discharging screw, the sealing structure enabling the solid-transferring screw to be lifted during operation while airtightness of t... | 04/17/2007 |
| 7198658 | Method for producing feed material for molten metal production and method for producing molten metal The prevent invention provides a method for producing a feed material for molten metal production and a method for producing a molten metal capable of sufficiently carbonizing biomass and effectively using carbonized biomass as a reducing agent. In the method for pr... | 04/03/2007 |
| 7192552 | Facility for reducing metal oxide, method of operating the same, and shaped article of raw material for reducing furnace The present invention provides a reducing furnace of the rotary hearth-type and a method for reducing a metal oxide simplified in the process from dehydration to molding, according to which a moisture-rich powdery raw material is reduced at low cost. The present inv... | 03/20/2007 |
| 7141205 | Method for discharging reduced product from a movable-hearth furnace and a discharging device A method for discharging a reduced product produced on a movable hearth of a movable-hearth furnace uses a discharging device. The discharging device includes a removal unit for removing the reduced product from the movable hearth, a separation unit for separating t... | 11/28/2006 |
| 6887298 | Method and equipment for smelting non-ferrous metal sulphides in a suspension smelting furnace in order to produce matte of a high non-ferrous metal content and disposable slag The present invention relates to a method and equipment, whereby matte with a high non-ferrous metal content and disposable slag are produced simultaneously in a suspension-smelting furnace from non-ferrous sulphide concentrate. According to the invention, a carbona... | 05/03/2005 |
| 6814924 | Rotary hearth furnace and screw thereof for discharging reduced iron A rotary hearth furnace is provided to simplify detachment and assembly operations of a reduced iron discharging screw. At both side walls of an insulating housing 2a constituting in part of a furnace body 2 of a rotary hearth furnace ... | 11/09/2004 |
| 6790255 | Moving-hearth heating furnace and method for making reduced metal agglomerates An annular rail 6 is fixed on the lower surface of a moving hearth 2, and the rail 6 is supported from below by support rollers 7 provided with elevating devices 8. The moving hearth 2 is continuously or intermittently moved... | 09/14/2004 |
| 6749664 | Furnace hearth for improved molten iron production and method of operation An apparatus and method for the direct reduction of iron oxide utilizes a hearth furnace having a vitreous hearth layer of conditioning materials, with the vitreous hearth layer introduced onto a refractory surface of the furnace. The vitreous hearth layer may have ... | 06/15/2004 |
| 6685466 | Rotary hearth furnace for producing reduced metal and method of producing reduced metal In a rotary hearth furnace for producing reduced metal through heating and reducing carbon containing materials composed of at least metal oxide-containing material and carbon-containing reduction material, a hearth structure is provided by which a refrac... | 02/03/2004 |
| 6685761 | Method for producing beneficiated titanium oxides The invention is a method and apparatus for producing beneficiated titanium oxides using a modified rotary hearth furnace, that is a finisher-hearth-melter (FHM) furnace. In the method the refractory surface of the hearth is coated with carbonaceous heart... | 02/03/2004 |
| 6682586 | Assemblies and methods for processing zinc-bearing materials A process for separating and recovering a desired metal as metal oxide from raw material is provided. The process includes placing the raw material and a reductant in a container to form a reducing microclimate within the container. A housing having an ox... | 01/27/2004 |
| 6669756 | Discharge apparatus for movable hearth type heat-treatment furnace, its operation method, and method and apparatus for manufacturing molten iron using the same Heat-treated products discharged from a discharge port of a movable hearth type heat treatment furnace, for example a rotary hearth type reduction furnace are discharged to a sorting means, the heat-treated products that foreign substances have been remov... | 12/30/2003 |
| 6660221 | Rotary hearth furnace and screw thereof for discharging reduced iron A rotary hearth furnace is provided to simplify detachment and assembly operations of a reduced iron discharging screw. At both side walls of an insulating housing 2]a constituting in part of a furnace body 2 of a rotary hearth furnace 1 are installed through-... | 12/09/2003 |
| 6582492 | Method for producing melt iron The invention concerns a method for producing melt iron comprising the following steps: a) reducing the iron ore particles to form pre-reduced iron comprising excess free carbon; b) hot process transfer of the pre-reduced iron in a smelting furnace; c) sm... | 06/24/2003 |
| 6511316 | Method of operating a rotary hearth furnace To provide an operating method of a rotary hearth furnace for producing reduced iron in which a stuck substance stuck on the hearth surface is removed from the hearth surface to thereby prevent or reduce the wear of the knife edge of a screw of a discharg... | 01/28/2003 |
| 6508856 | Furnace discharge system and method of operation A furnace discharge system for removing material from a hearth (18) of a rotary hearth furnace (10) and method of operation. The system includes at least two material discharge augers (28, 30) positioned above the hearth (18) of the rotary hearth furnace ... | 01/21/2003 |
| 6451086 | Process for thermal treatment of residual materials containing heavy metal and iron oxide A process for thermal treatment of residual materials containing heavy metal and iron oxide, including providing a multiple-hearth furnace having hearths provided one above the other, depositing the residual materials continuously on a top hearth of the h... | 09/17/2002 |
| 6447713 | Rotating-hearth furnace for reduction of metallic oxides A method for improving the direct reduction of metal oxides in a continuous furnace with a rotating hearth. The method deposits two or several layers with increasing metal oxide contents in each layer towards a top loading surface and decreases carbon con... | 09/10/2002 |
| 6413295 | Iron production method of operation in a rotary hearth furnace and improved furnace apparatus The present invention is an apparatus and method for the direct reduction of iron oxide utilizing a rotary hearth furnace to form a high purity carbon-containing iron metal button. The hearth layer may be a refractory or a vitreous hearth layer of iron ox... | 07/02/2002 |
| 6413471 | Apparatus for producing reduced iron An apparatus for producing reduced iron by agglomerating a mixed powder of an iron material and a reducing agent to form compacts like briquettes or pellets, and reducing the compacts in a high temperature atmosphere is disclosed. In the apparatus, a rota... | 07/02/2002 |
| 6368379 | Apparatus and method for producing reduced metal An apparatus for producing a reduced metal includes a moving hearth reducing furnace, a feeding section, a metal discharge section, a gas discharge section, and a regenerative burner. The moving hearth reducing furnace heats a raw material composed of a m... | 04/09/2002 |
| 6319302 | Method for manufacturing reduced iron agglomerates and apparatus there for A method for manufacturing reduced iron agglomerates comprises the steps of supplying iron oxide agglomerates including carbonaceous material on a moving hearth, heating and reducing the agglomerates to yield reduced iron agglomerates while the moving hea... | 11/20/2001 |
| 6270554 | Continuous nickel matte converter for production of low iron containing nickel-rich matte with improved cobalt recovery A continuous nickel matte converter and method for the efficient production of low iron nickel-rich mattes from high-iron nickel-rich mattes, with minimal environmental impact. The present invention processes high-iron, nickel-rich primary furnace mattes ... | 08/07/2001 |
| 6258149 | Method of producing reduced iron agglomerates A method of producing reduced iron agglomerates capable of preventing oxidation in the surface layer of the agglomerates and obtaining reduced iron agglomerates having a high degree of metallization, by blowing a methane or methane-containing gas to the r... | 07/10/2001 |
| 6254665 | Method for producing reduced iron agglomerates A moving hearth is formed by providing a layer of hearth material primarily composed of iron oxide on a base refractory in a reducing furnace and then sintering the hearth material so that the sintered moving hearth is not melted at an operational tempera... | 07/03/2001 |
| 6251161 | Method for operating moving hearth reducing furnace A moving hearth reducing furnace is operated, while a gap is provided between a discharging apparatus for discharging reduced iron agglomerates from the moving hearth reducing furnace and the surface of the moving hearth. The gap prevents squeezing metall... | 06/26/2001 |
| 6241798 | Iron smelting process and plant according to the multiple zone smelting process In order to be able to process in an economical manner different iron carriers in varying quantitative compositions, a plant for the production of iron melts (4), in particular steel melts, such as crude steel melts, is equipped with an electric are furna... | 06/05/2001 |
| 6117387 | Apparatus for production of direct reduced iron with reduced fuel consumption and emission of carbon monoxide A system for producing direct reduced iron wherein iron oxide material and carbonaceous material is passed successively through an oxidizing zone and a reducing zone of a furnace, each zone fired by oxy-fuel combustion, enabling a reduction in the amount ... | 09/12/2000 |
| 6015527 | Facility for producing reduced iron In the method of producing reduced iron according to the invention, fine iron oxides and powdery solid reductants are mixed, compacted into sheet-like compacts, and charged onto the hearth of a reduction furnace for reduction while maintaining the tempera... | 01/18/2000 |
| 5951740 | Production of direct reduced iron with reduced fuel consumption and emission of carbon monoxide A system for producing direct reduced iron wherein iron oxide material and carbonaceous material is passed successively through an oxidizing zone and a reducing zone of a furnace, each zone fired by oxy-fuel combustion, enabling a reduction in the amount ... | 09/14/1999 |
| 5460642 | Aerosol reduction process for metal halides A method and apparatus for continuously producing metals such as zirconium, hafnium, titanium, niobium, vanadium, silicon and tantalum. The corresponding metal halide is reacted with a metallic reducing agent such as aluminum, calcium, magnesium and sodiu... | 10/24/1995 |
| 5378260 | Two-zone countercurrent smelter system and process A process for continuously smelting iron ore by use of coal to yield molten iron or semi-steel is disclosed. The process comprises the steps of establishing a melt covered by slag; inducing the slag and the molten iron to flow countercurrently to one anot... | 01/03/1995 |
| 5316471 | Method and apparatus for mass transfer in multiple hearth funaces An apparatus for improving mass transfer in a multiple hearth furnace has a plurality of risers adjacent the furnace center shaft which are in fluid communication with a source of treatment fluid. The risers have radially extending branch pipes, each pipe... | 05/31/1994 |
| 5257804 | Device for igniting a bed of a mixture of materials such as ore and coke Device (10) for igniting a moving bed of a mixture (12), in particular a mixture comprising iron ore and coke the combustion of which produces the agglomeration of the ore. The device comprises a hood (14) under which burners (16) are arranged and through... | 11/02/1993 |
| 5223019 | Method and apparatus for sintering operation A sintering method, which includes igniting a layer of raw materials and providing a downwardly directed air suction is improved by applying a magnetic field to the materials for which a predetermined amount of sintering has been completed in the upper re... | 06/29/1993 |
| 4978106 | Iron reduction apparatus A method and apparatus for reducing iron in a steelmaking process including a closed thermal transfer system in which a flow of process ingredients including iron ore is directed in a descending, preferably spiral path defined by a downwardly spiraling pi... | 12/18/1990 |
