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| Number | Title | Issue Date |
| 7922484 | Rotary hearth furnace To provide a rotary hearth furnace which has a simple furnace structure in which the furnace is not damaged even if the furnace is operated for a long term while presenting general equations capable of adequately determining a thermal expansion margin in the rotary ... | 04/12/2011 |
| 7340420 | Method and system for providing information on industrial wastes, server and terminal for providing the information, recording medium for recording computer-readable program, and program allowing computer to execute process A system provides assistance in the delivery of industrial wastes from industrial waste-generating sites to one or more industrial waste treatment sites based on exchanged information on industrial wastes containing metal oxide. The system includes a server, termina... | 03/04/2008 |
| 7175691 | Method of producing stainless steel by re-using waste material of stainless steel producing process A method of producing stainless steel includes the steps of melting a raw material in an electric furnace to form molten steel, and then refining the molten steel by a refining furnace to produce stainless steel in a stainless steel producing process. In the method,... | 02/13/2007 |
| 7037356 | Method for operating rotary hearth type reducing furnace and rotary hearth type reducing furnace facilities The present invention provides a method of operation and a facility for the same suppressing the generation of dioxins in the combustion exhaust gas and efficiently reclaiming heat from high temperature combustion exhaust gas when firing and reducing fines of chromi... | 05/02/2006 |
| 7032526 | Method for combustion treatment of combustible waste and apparatus therefor The present invention can provide a method for combustion treatment capable of efficiently treating combustible waste, and a combustion treatment apparatus capable of realizing such a method. The present invention can further provide a method for combustion treatmen... | 04/25/2006 |
| 6993855 | Method for drying compact containing metal oxide, method for reducing metal oxide, and rotary-hearth-type metal reducing furnace The present invention provides: a method for drying compacts containing water so as not to cause explosion and powdering; a method for reducing the compacts after being dried with great efficiency in a rotary-hearth-type reducing furnace; and a rotary-hearth-type me... | 02/07/2006 |
| 6966770 | Rotary hearth furnace for use in the iron and steel industry A rotary hearth furnace for use in the iron and steel industry comprises a furnace (12, 112) with plan in the shape of an annulus, closed at the bottom by a rotary hearth (14, 114), lined at the top with refractory material (15, 115), and a base... | 11/22/2005 |
| 6872074 | 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... | 03/29/2005 |
| 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 |
| 6749800 | Arrangement and method for transporting metallic work pieces, and system for heat treatment of said work pieces An arrangement for transporting metallic work pieces includes a heat-insulated transport chamber, means for loading and unloading the work pieces, and transporting gear. To enable the flexible and efficient transport of the work pieces among a number of treatment ch... | 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 |
| 6629839 | Method and apparatus for charging raw and carbonaceous materials into a moving hearth furnace The invention provides a method and apparatus for charging a raw material and a carbonaceous material, in which a reduced product generated on a hearth can be quickly melted for reliable separation into a metal and slag, and the metal and the slag can be ... | 10/07/2003 |
| 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 |
| 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 |
| 6390810 | Method and apparatus for reducing a feed material in a rotary hearth furnace A rotary hearth furnace for reducing a feed material is disclosed. The rotary hearth furnace includes a rotating hearth disposed in an enclosure and mounted for rotary movement. The enclosure includes an annular inner wall, an annular outer wall and a roo... | 05/21/2002 |
| 6368104 | Rotary hearth furnace An improved rotary hearth furnace having a cylindrical enclosure containing a radially moving belt for transporting pellets containing metal oxide and carbon is disclosed. One or more oxy-fuel burners preferably having a flat flame shape are positioned so... | 04/09/2002 |
| 6336808 | Process for manipulating workpieces and a rotating hearth furnace for the same A process for manipulating workpieces, which are to be carburized, wherein the workpieces or workpiece magazines that are to be deposited on pallets are loaded in several rows, corresponding to a predefined number of rows of workpieces, into a rotating he... | 01/08/2002 |
| 6305931 | Rotary hearth furnace with lightened construction A rotary hearth furnace, in particular for the treatment of minerals or oxidized materials, includes a toroidal chamber wherein the bottom wall, i.e., the hearth, rotates as to the rest of the chamber the hearth includes a refractory material layer suppor... | 10/23/2001 |
| 6296479 | Direct reduction method and rotary hearth furnace Raw materials, including a metal oxide and a carbonaceous material, are supplied into a rotary hearth furnace. Then, the raw materials are heated and reduced by burners, which are arranged to cause a strong stirring action for an atmosphere around the raw... | 10/02/2001 |
| 6210155 | Charging device for a rotary hearth furnace The invention relates to a charging device for creating superimposed layers of fine-grained bulk material on a rotating hearth (2). For each layer of bulk material to be charged, said charging device comprises a discharge hopper (22) having an outflow slo... | 04/03/2001 |
| 6142772 | Movable tunnel kiln for making clay products and a system with the tunnel kiln The invention relates to a movable tunnel kiln for clay product manufacture and a production process system employing a tunnel kiln. Provided a kiln bottom of the tunnel kiln is fixed and takes a circular shape, the kiln body is circular and movable, road... | 11/07/2000 |
| 6139314 | Rotary hearth furnace Furnace for the treatment of ore on a rotary hearth, including a toroidal chamber, a rotary hearth and drives for the rotary hearth, the hearth being arranged on a supporting frame fitted with guides means and motion-supports; the drives are at least part... | 10/31/2000 |
| 6135766 | Rotary hearth furnace and method of operating the same A feed stock composed of an iron ore and a solid reducing material is supplied in a movable hearth furnace provided with a unidirectionally movable hearth, stacked on the movable hearth and then subjected to a series of operations of preheating, reduction... | 10/24/2000 |
| 6116897 | Fastener installing apparatus A fastener installing machine (10) comprising an oven (12) for heating fasteners, a carousel (14) for moving fasteners through the oven, a drive shaft (18) for rotating the carousel and means (32,38) for attaching the oven to the machine which means is di... | 09/12/2000 |
| 5989019 | Direct reduction method and rotary hearth furnace In a rotary hearth furnace wherein objects including a mixture of a metal oxide, a reductant such as coal, and the like are fed onto the hearth, the fed objects are heated and reduced through the application of a flame of a burner provided on a ceiling po... | 11/23/1999 |
| 5944514 | Process and device for introducing bulk material into a rotary hearth furnace A process for feeding bulk material onto a belt of a rotary hearth furnace, which has hoods that cover the hearth belt in such a manner as to form a ring. The bulk material is deposited on a transport device at a layer thickness proportionately dependent ... | 08/31/1999 |
| 5906855 | Method and device for baking food A method pertaining to the baking of products (B) in a baking oven (1) in which the products are supported by at least one rotary oven trolley (17) comprises rotating the trolley through a number of revolutions in one direction (R1) during the baking proc... | 05/25/1999 |
| 5895215 | Charging apparatus for a rotary hearth furnance An apparatus for charging a feed material onto a rotating hearth of a rotary hearth furnace, the rotary hearth furnace including refractory lined inner and outer walls and having a refractory roof supported thereon, the apparatus comprising a table mounte... | 04/20/1999 |
| 5868566 | Sealed and zone rotary grate convection solids processing apparatus A rotary hearth furnace includes a base having a plurality of first plenums, an upper chamber having a plurality of second plenums and a hearth rotatable between the base and the upper chamber and having a plurality of third plenums. The hearth is moveabl... | 02/09/1999 |
| 5850781 | Oven with zones situated above one another An oven comprises a housing with at least two zones, which are each provided with a device for setting a cooking state in the relevant zone, such as the temperature and relative humidity, as well as a conveyor belt, which runs through each of the zones an... | 12/22/1998 |
| 5836240 | Oven with hot air guide An oven for preparing food products comprises a housing, a conveyor belt which is movable through the housing and on which the food products can be arranged, which conveyor belt follows a helical path, heating elements and booster devices for generating a... | 11/17/1998 |
| 5810580 | Mixing rabble for a rotary hearth furnace A rotary hearth furnace has a mixing rabble arrangement that includes a first rabble disposed upstream a flow of material on the hearth and a second rabble disposed downstream a flow of material on the hearth. The first and second rabbles are disposed at ... | 09/22/1998 |
| 5769627 | Vertical type calcination kiln A storage device 23 for storing a raw material to be calcined is provided at a position above a kiln cover 1, and the storage device 23 is connected to a preheating space 22 in such a manner as to be capable of dropwise supplying the raw material into the... | 06/23/1998 |
| 5722825 | Device for heat-treating metallic work pieces in a vacuum A device for heat-treating metallic workpieces in a vacuum has a revolving vacuum furnace with an inlet transfer lock for introducing a batch of workpieces into the revolving vacuum furnace and with an outlet transfer lock for removing the batch of workpi... | 03/03/1998 |
| 5702245 | Conveyor for processing equipment having gas flow compensation A processing apparatus, conveyor and method for processing products or materials, such as food processing equipment or methods, is configured such that the conveyor travels in a generally helical path within a processing chamber to expose products on the ... | 12/30/1997 |
| 5297959 | High temperature furnace A high temperature, low NOx industrial furnace uses coal-fired burners placed in an arcuate heat track conduit which heats an arcuately configured wall member extending through an opening in the heat track conduit. The heated portion of the wal... | 03/29/1994 |
| 5207972 | High temperature furnace A high temperature, low NOx industrial furnace coal-fired burners placed in an arcuate heat track conduit which heats an arcuately configured wall member extending through an opening in the heat track conduit. The heated portion of the wall mem... | 05/04/1993 |
| 5173047 | Shrouded rabbles for use in rotary hearth furnaces A shrouded rabble includes a blade having an active face and a backface with a shroud extending from the backface along a lower edge of the blade. The rabble is suspended above a perforated hearth for urging charge materials on the hearth from one locatio... | 12/22/1992 |
| 5164145 | Rotary furnace oil seal employing endothermic gas purge A rotary oil seal gas purge system for a rotary carburizing furnace, having a rotatable hearth in a furnace chamber containing a high carbon-potential furnace atmosphere comprising an endothermic carrier gas enriched with a hydrocarbon gas, features gas p... | 11/17/1992 |
| 5078368 | Gas fired melting furnace A high temperature gas fired heat transfer system ideally suited for melting metals is disclosed. The system generates a heated, reducing furnace atmosphere which prevents formation of metal oxides when the metal is melted. A unique arrangement is provide... | 01/07/1992 |
