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| Number | Title | Issue Date |
| 7914731 | Process for sintering on a sintering machine A process for sintering metal-containing materials, such as iron ores or manganese ores, on a sintering machine including a sintering belt for transporting the sinter mix during sintering thereof. The sintering belt has first, second and third portions. Sintering wa... | 03/29/2011 |
| 7632453 | Gas quenching method using a recycling facility The invention relates to a gas quenching method of the type that makes use of (i) a quenching cell (V1) which is intended to receive objects to be quenched with a quenching gas and (ii) a buffer capacity (V2) which is designed to contain the quenching ... | 12/15/2009 |
| 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 |
| 6797034 | Method of producing reduced metals and apparatus for reducing metal oxides A method of producing reduced metals is disclosed in which a mixture of a metal oxide and a reducing agent is heated by a burner such that the metal oxide is reduced to a reduced metal. Dry-distilled gas generated during carbonization of an organic matter-containing... | 09/28/2004 |
| 6761779 | Preheating of metal strip, especially in galvanizing or annealing lines A method is disclosed for preheating a metal strip in at least one direct fired preheating section of a furnace for limiting the oxidation of the metal strip. The method includes installing burners in the preheating section along its length for establishing a plural... | 07/13/2004 |
| 6592646 | Method of producing direct reduced iron with use of coal-derived gas and apparatus In a method of producing direct reduced iron with use of a coal-derived gas, coal is heated to lower the moisture thereof, and the moisture-lowered coal is gasified in a coal gasification furnace to produce a coal-derived gas containing a reducing gas. Th... | 07/15/2003 |
| 6569377 | Plant for the direct reduction of particulate iron-oxide-containing material In a process for the direct reduction of particulate iron-oxide-containing material by fluidization, a synthesis gas is introduced as a reducing gas into several fluidized bed zones consecutively arranged in series. The reducing gas is conducted from one ... | 05/27/2003 |
| 6551549 | Apparatus for the direct reduction of iron oxides Apparatus for the direct reduction of mineral iron comprising a vertical reduction furnace (10) of the type with a gravitational load to achieve therein reduction reactions of the mineral iron, means (11) to feed the mineral iron into the furnace (10) fro... | 04/22/2003 |
| 6495092 | Combustion apparatus and melting furnace for nonferrous metals A combustion apparatus comprises a pair or more than two pairs of burner groups. Each burner group comprises one regenerator per a plurality of burners. In each pair of burner groups, a first burner group and a second burner group are fired alternately an... | 12/17/2002 |
| 6491738 | 2-stage fluidized bed type fine iron ore reducing apparatus, and reducing method using the apparatus A two-stage fluidized bed reducing apparatus and a reducing method for fine iron ore of a wide particle size distribution with an increased degree of utilization of the reducing gas. Fine iron particles dropping through the holes of a gas distributor can ... | 12/10/2002 |
| 6482351 | Apparatus for producing reduced iron An apparatus for producing reduced iron dries agglomerates, pelletized from a powdery mixture of an iron oxide powder and a reducing agent, in a drying chamber, preheats the dried agglomerates in a preheating chamber, and then reduces the preheated agglom... | 11/19/2002 |
| 6383444 | Process for processing of reduction gas in a process for the reduction of gas A process to optimize the reduction process with a given quality of ore. The reduction gas 7 is analyzed by means of gas sensor 1 and is separated into two partial flows. The throughput of the partial flow which is oxidized is regulated by a regulation va... | 05/07/2002 |
| 6379421 | Method and apparatus removing undesirable metals from iron-containing materials The present invention relates to a method and apparatus for separating undesired toxic metals, such as Zn, Pb and Cd, from iron-containing materials by: sintering a mixture of such materials (typically including EAF dust and mill scale) with carbonaceous ... | 04/30/2002 |
| 6379420 | Method and plant for producing a reducing gas serving for the reduction of metal ore In a method for producing a hot CO- and H2 -containing reducing gas serving for the reduction of fine-grained metal ore, in particular iron ore, the reducing gas is formed in a gasification zone by a gasification of carbon carriers, in particul... | 04/30/2002 |
| 6277324 | Apparatus for manufacturing molten pig iron and reduced iron by utilizing a fluidized bed An apparatus and a method for manufacturing molten pig iron by using a fine iron ore are disclosed. Coal is used to produce a reducing gas, and a fine iron ore is used to produce a molten iron and a reduced iron in a simple and efficient manner. The appar... | 08/21/2001 |
| 6273934 | Method and an apparatus for producing metals and metal alloys A method of producing metals and metal alloys from metal oxides is disclosed. The method comprises the steps of partially pre-reducing the metal oxides to a pre-reduction degree of at least 60% in one or more pre-reduction stages. Thereafter, the method c... | 08/14/2001 |
| 6264722 | Process for producing liquid pig iron or intermediate steel products and installation for implementing it In a process for producing molten pig iron or steel preproducts from fine-particulate iron containing material in a meltdown gasifying zone of a melter gasifier, under the supply of carbon-containing material and oxygen-containing gas at the simultaneous ... | 07/24/2001 |
| 6251162 | Process for the production of liquid pig iron or liquid intermediate products of steel In a method for producing liquid pig iron or liquid steel pre-products from charging substances comprising iron ore, preferably in lumps or pellets, and optionally fluxes. The charging substances are directly reduced to sponge iron in a reduction zone (12... | 06/26/2001 |
| 6235082 | Process for producing liquid metal and facilities for carrying out the process With a method for producing liquid metal from charging substances containing ore and of fluxes, the ore is directly reduced to sponge metal in at least one reduction zone (5, 7, 8), the sponge metal is melted along with fluxes in a melt-down gasifying zon... | 05/22/2001 |
| 6235083 | Method for producing a reducing gas serving for the reduction of metal ore A method for producing a hot CO- and H2 -containing reducing gas utilized for the reduction of lumpy metal ore, in particular iron ore, which comprises forming the reducing gas in a gasification zone by the gasification of carbon carriers, in p... | 05/22/2001 |
| 6224650 | Apparatus for manufacturing molten iron by using calcination furnace, and manufacturing method therefor An apparatus for manufacturing molten iron by using a calcination furnace, and a manufacturing method therefor are disclosed. A high temperature reducing gas (1000 to 1100° C.) from a melter gasifier is used as a calcination heat in a calcination furnace... | 05/01/2001 |
| 6214082 | Process for the reduction of metal-oxide-bearing material The invention relates to a process for the reduction of metal-oxide-bearing material, particularly of iron ore, in a reduction vessel (1), wherein the metal-oxide-bearing material is charged from a vessel (2) for the metal-oxide-bearing material into the ... | 04/10/2001 |
| 6210631 | Reduction vessel for the reduction of metal-oxide-bearing material The invention relates to a reduction vessel (1) for the reduction of metal-oxide-bearing material, particularly of iron ore, by means of a reduction gas flowing countercurrently to the metal-oxide-bearing material, which reduction vessel (1) is provided w... | 04/03/2001 |
| 6203594 | Method for reducing iron ore in a blast furnace A method and a plant for reducing iron ore to pig iron in a blast furnace with the use of carbon, wherein a partial quantity of the carbon is admixed to the iron ore in the form of coke which ensures that the bulk material column is loosened and supported... | 03/20/2001 |
| 6200518 | Melt-reducing facility and method of operation thereof A melt-reducing facility for directly producing molten iron or molten pig iron by throwing iron bearing material, carbon material and flux into furnace bodies and blowing pure oxygen and/or an oxygen-rich gas therein, wherein a waste heat boiler and a pow... | 03/13/2001 |
| 6183535 | Method for increasing the capacity of a direct reduced iron plant without increasing its reformer capacity A method and apparatus for increasing the productivity of an existing direct reduction iron (DRI) plant without increasing its reformer capacity existing in the plant. This object is achieved by not only recycling some effluent gas of the reduction reacto... | 02/06/2001 |
| 6149859 | Gasification plant for direct reduction reactors The present invention is an integrated process and apparatus for supplying at least a portion of the reducing gas feedstock to a reduction reactor, such as a reactor for the direct reduction of iron, wherein the reducing gas contacts a feed material at a ... | 11/21/2000 |
| 6126716 | Iron-base scrap preheating apparatus and method In order to preheat pieces of iron scrap of various sizes and shapes highly effectively while avoiding the fusion of the pieces of iron scrap, a rotary kiln type preheating furnace and a shaft type preheating furnace are arranged in parallel with each oth... | 10/03/2000 |
| 6110413 | 3-Stage fluidized bed type fine iron ore reducing apparatus having x-shaped circulating tubes A 3-stage fluidized bed type iron ore reducing apparatus having X shaped circulating tubes is disclosed for forming a gas pore fluidizing layer of a fine iron ore, and for drying/pre-heating it to reduce it, so that the gas utilization rate and the reduci... | 08/29/2000 |
| 6039916 | Apparatus for producing direct reduced iron with a controlled amount of carbon Method and apparatus for the production of prereduced iron ore, Direct Reduced Iron (DRI), or the like, in an ironmaking plant wherein the reducing gas utilized in the chemical reduction of iron oxides is generated from natural gas within the reduction re... | 03/21/2000 |
| 6024912 | Apparatus and process system for preheating of steel scrap for melting metallurgical furnaces with concurrent flow of scrap and heating gases The invention provides a novel preheating apparatus and method for preheating a ferrous scrap mixture prior to feeding the scrap into a metallurgical furnace, primarily using heat recovered from hot waste gases emitted from the furnace exhaust port, and s... | 02/15/2000 |
| 6007761 | Heat treating furnace for a continously supplied metal strip A continuous heat treating furnace in which heat is efficiently recovered from the combustion exhaust gas from the heating section of a continuous annealing furnace. The continuous annealing furnace of the metal strip is a heating furnace or a heating dev... | 12/28/1999 |
| 6004369 | Steel production method The invention relates to a method to produce steel from a ferrous material, by using one furnace divided into, at least, two vessels which are connected to each other at least by ducts for the off-gases and ducts for the melted metal. The vessels have a g... | 12/21/1999 |
| 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 |
| 5997608 | Process for the production of molten pig iron or molten steel, pre-products and sponge iron and a plant for carrying out the process In a process for the production of molten pig iron or molten steel pre-products and sponge iron from charging materials consisting of iron ore and, if desired, fluxes, direct reduction of the charging materials to sponge iron is carried out in a fixed-bed... | 12/07/1999 |
| 5971752 | Sintering plant A sintering plant includes an apparatus for transporting sinter material along a sintering section through at least one first zone in which the sinter material heats to a low temperature, and through a second zone in which the sinter material heats to a h... | 10/26/1999 |
| 5968448 | Process and apparatus for producing molten pig iron A process for producing molten pig iron uses direct reduction of iron ore in a pre-reduction stage followed by a final reduction stage. In the pre-reduction stage iron ore is pre-reduced in a melting cyclone by means of a reducing process gas originating ... | 10/19/1999 |
| 5961690 | Process for producing molten pig iron of liquid steel preproducts and plant for carrying out the process In a process for producing molten pig iron or liquid steel pre-products, from particulate iron-oxide-containing material by fluidization, the iron-oxide-containing material is prereduced in at least one prereduction stage (7) by aid of a reducing gas and ... | 10/05/1999 |
| 5897829 | Apparatus for reducing fine iron ore A device for three-stage fluidized bed for reducing a fine iron ore in accordance with the present invention comprises: a first single-type fluidized bed furnace for drying/pre-heating a fine iron ore in a bubbling fluidized state; a first cyclone for col... | 04/27/1999 |
| 5871560 | Process and plant for the direct reduction of iron-oxide-containing materials A direct reduction process is disclosed for iron oxide-containing materials. Synthesis gas is mixed with top gas produced during direct reduction of the iron oxide-containing materials and is used as reduction gas for directly reducing and heating the iro... | 02/16/1999 |
