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Class 75/490 - Solid Iron(Fe) produced within shaft furnace


Subclass of Class 75 - Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
Definition: Process wherein an Iron (Fe) compound is reduced to solid
No. of patents: 46
Last issue date: 12/30/2008


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NumberTitleIssue Date
7470310Method and device for producing a static bed
Apparatus and process for producing a fixed bed in a metallurgical unit, preferably for producing pig iron or primary steel products from iron-containing charge materials, in particular in a melted gasifier, in which a lumpy bulk material, which contains ore-contain...
12/30/2008
6996989Process to recover energy from hot gas
A process to recover energy from a gas having a temperature of above 650° C. and an absolute pressure of more than 1.7 bar and having non-solidified alkali containing compounds and particles by performing the following steps: (a) cooling the gas to a t...
02/14/2006
6676731Method of charging a pressurized container with granular solids
The solids will first of all reach a first container under atmospheric pressure and then reach a second container of variable pressure, which is disposed thereunder, before they are introduced into the pressure vessel. The first and the second container e...
01/13/2004
6319301Method for the direct reduction of iron oxides
Method for the direct reduction of mineral iron inside a vertical reduction furnace (10) of the type with a gravitational load, wherein the reduction gas flows in counter-flow with respect to the material introduced into the furnace, comprising the follow...
11/20/2001
6270550Method for direct reduction of iron bearing pellets or lump iron ore
A method for effecting direct reduction of iron oxides in the form of lumps or pellets, in which an ore burden is passed downwardly successively through prereduction and metallization zones of a shaft furnace while passing a flow of rich fuel gas produced...
08/07/2001
6214082Process 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
6214086Direct reduced iron discharge system and method
A method and apparatus for simultaneously supplying varying proportions of hot and cold direct reduced iron(DRI) material from a source of hot DRI for melting, storage, briquetting, or transport. The system uses gravity to transport hot DRI material from ...
04/10/2001
6162050Furnace for the direct reduction of iron oxides
Gravitational type furnace for the direct reduction of mineral iron comprising a median reaction zone (14) in which the reactions to reduce the mineral iron occur, means (11) to feed the mineral iron to said reaction zone (14), means (18) to introduce a m...
12/19/2000
6146442Apparatus and method for introducing gas into a shaft furnace without disturbing burden flow
An apparatus for the direct reduction of iron oxide utilizing a shaft furnace equipped with a bustle and tuyere system having multiple rows of tuyeres. The bustle and tuyere system utilizes multiple rows of tuyeres to aid in the reduction of gas velocitie...
11/14/2000
6027545Method and apparatus for producing direct reduced iron with improved reducing gas utilization
A method and apparatus for producing DRI, prereduced materials, or the like, utilized in the steelmaking industry, where hydrogen contained in the gas stream purged from the reduction reactor is separated (preferably by means of a PSA system) and recycled...
02/22/2000
5858057Method 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...
01/12/1999
5643354High temperature oxygen production for ironmaking processes
A direct ironmaking process in which coal and oxygen are used directly for reducing ore and smelting the resulting sponge iron wherein a high-temperature ion transport membrane process recovers oxygen for use in the ironmaking process. Heat for oxygen rec...
07/01/1997
5618032Shaft furnace for production of iron carbide
Apparatus for the production of iron carbide in a shaft furnace, by reacting a carbon containing reducing gas as the process gas with particulate metal oxide material for an extended residence time at low temperature, including residence time and operatin...
04/08/1997
5437708Iron carbide production in shaft furnace
A method and apparatus for the production of iron carbide in a shaft furnace, by reacting a carbon containing reducing gas as the process gas with particulate metal oxide material for an extended residence time at low temperature....
08/01/1995
5078788Method for the direct reduction of iron
A process for the direct reduction of metal oxides containing iron to obtain a DRI metallized iron product comprises feeding heavy hydrocarbon oil under controlled conditions to a cracking zone upstream of the reduction reactor so as to form a cracked pro...
01/07/1992
5069716Process for the production of liquid steel from iron containing metal oxides
The present invention relates to a process for the production of liquid steel from iron containing metal oxides and, more particularly, a process for the direct production of iron-containing metal oxides wherein the hot discharge of direct reduced iron (D...
12/03/1991
5064467Method and apparatus for the direct reduction of iron
A process for the direct reduction of iron-containing metal oxides to obtain iron is disclosed in which a reformed reduction gas rich in H2 and CO and having an oxidation degree in the range of from about 0.30 to about 0.35 is formed and reduct...
11/12/1991
4897113Direct reduction process in reactor with hot discharge
A method is disclosed for the gaseous reduction of iron ore to sponge iron at a given degree of carburization and yet at a temperature suitable for hot briquetting or for direct feed to a melter or to a refining furnace. The desired percentage of carburiz...
01/30/1990
4793856Process for the direct reduction of iron ores
A method for the gaseous reduction of particulate iron ore to sponge iron product in a vertical shaft reactor having a reduction zone in the upper portion thereof, a cooling zone in the lower portion thereof and an intermediate zone between the reduction ...
12/27/1988
4734128Direct reduction reactor with hot discharge
A method is disclosed for the gaseous reduction of iron ore to sponge iron at a given degree of carburization and yet at a temperature suitable for hot briquetting or for direct feed to a melter or to a refining furnace. The desired percentage of carburiz...
03/29/1988
4725309Method and apparatus for producing hot direct reduced iron
A method and an apparatus for the gaseous reduction of particulate iron ores is disclosed, wherein the reduced ore, commonly called DRI (Direct Reduced Iron) or sponge iron, is treated in a vertical shaft moving bed furnace and discharged from said furnac...
02/16/1988
4720299Method for the direct reduction of particulate iron-oxide-containing material
A method for the direct reduction of particulate iron-oxide-containing material. The method is carried out in a shaft furnace, wherein reformed gas from a reformer is fed as reducing gas to a reducing zone of the shaft furnace, the directly reduced ferrou...
01/19/1988
4498498Double valve assembly
A double valve assembly for regulating the feed of particulate material to or from a pressure vessel comprises a valve casing containing a flow-regulating valve and pressure sealing valve in series. Particulate material is fed to the valve assembly throug...
02/12/1985
4432789Method of minimizing energy consumption when reducing iron oxide with reducing gases
Energy consumption may be minimized when reducing iron oxide with reducing gases which are at least partially re-circulated in the process and where the re-circulation gas is washed to remove the reaction product CO2 in what is known as a CO
02/21/1984
4407489Apparatus for discharging hot flowable solids from an upright container, particularly for discharging sponge iron from a shaft furnace
A discharge implement is provided, which is operable to discharge sponge iron from a shaft furnace and constitutes the bottom structure of the shaft furnace and is formed with flow passages for a cooling liquid. In order to ensure a uniform discharge, the...
10/04/1983
4380328Shaft furnace for reducing ores
A shaft furnace for reducing ores with a gas, wherein the furnace is constructed to destroy the plug-flow state of ores in or above a plug-flow zone where a reduction ratio of the ores is 50 to 70%, in order to prevent the clustering by changing the plug-...
04/19/1983
4370161Ore reduction using calcium oxide desulfurization
A process and apparatus for producing a low sulfur content hot reducing gas by desulfurizing hot reducing gas by contacting the sulfur-bearing hot reducing gas or carbonaceous material with a particulate calcium oxide desulfurizing agent to thereby produc...
01/25/1983
4363473Apparatus for reducing iron ore or the like
A reduction process and apparatus wherein the flow of the reducing fluid through the fixed bed of iron ore, oxidized pellet or the like to be reduced is reversed in direction so that the iron ore, oxidized pellet or the like, at any place in the bed, may ...
12/14/1982
4358310Dry collection of metallized fines
A method and apparatus for the dry collection of metallized fines from a direct reduction furnace cooling zone in which cooling gas removed from the cooling zone passes through a dust collector and the removed dust is cooled in a fluidized bed, the fluidi...
11/09/1982
4338123Method and apparatus for the reduction of metal ores
A method and apparatus is disclosed for reducing metal ore to sponge metal in a vertical shaft, moving bed, gaseous reduction reactor by controlling the amount of gas intermixing between the reduction and cooling zones of the reactor to result in increase...
07/06/1982
4268303Direct reduction process for producing reduced iron
The present invention discloses a direct reduction process for producing reduced iron by reducing iron ores and/or pellets with reducing gases, wherein the iron ores and/or pellets are reduced to a degree of reduction of 30-80% by a reducing gas containin...
05/19/1981
4252299Method and apparatus for discharging material from a shaft furnace
A method and apparatus for discharging freshly reduced material from a shaft furnace and controlling release of spent reducing gases so that they are not a hazard. The apparatus includes a pair of surge bins and means for directing material selectively to...
02/24/1981
4251267Method for direct reduction of metal oxide to a hot metallized product in solid form
A method for the continuous direct reduction of metal oxides, ores, etc. to a hot metallized product in solid form. A unique gas seal is employed to prevent the leakage of reduction gas from the bottom of the closed shaft furnace when the product is being...
02/17/1981
4248623Process for the direct reduction of iron ores
A process for the direct reduction of iron ore in a shaft furnace having an upper reducing zone and a lower cooling zone in which reducing gas is introduced to the furnace at the bottom of the reducing zone around the periphery of the furnace, exhausted r...
02/03/1981
4246024Method for the gaseous reduction of metal ores using reducing gas produced by gasification of solid or liquid fossil fuels
A method for the gaseous reduction of particulate ores to metals in a moving bed, vertical shaft reactor using a reducing gas externally supplied from a solid or liquid fossil fuel gasification unit. The reducing gas is reformed in a reforming zone locate...
01/20/1981
4230594Method of treating spent reducing gas
A method of producing reducing gases from oxide ores, particularly iron ores, which contain mainly carbon monoxide and hydrogen and which are employed in the reduction process with a two to three fold excess with regard to the stoichiometric requirement o...
10/28/1980
4224057Method for carburizing sponge iron
Sponge iron is carburized in the cooling zone of a vertical shaft iron ore reduction reactor by causing a carbon-containing gas to circulate in a closed loop including the cooling zone of the reactor and an external conduit containing a quench cooler and ...
09/23/1980
4179281Method for cooling high-temperature reduced iron
A method for cooling high temperature reduced iron produced by a direct reduction process in a cooling zone integrated with a direct reduction furnace, such as a shaft furnace, which method utilizes the exhaust gas of the reducing furnace as the cooling g...
12/18/1979
4153450Method and apparatus for measuring and controlling the percentage reduction of ore in a moving bed gaseous reduction reactor
A method and apparatus for measuring and controlling the percentage reduction of iron ore in a vertical shaft, moving bed, gaseous reduction reactor. Reducing gas comprising hydrogen, methane, carbon monoxide and carbon dioxide is fed from a source of suc...
05/08/1979
4135914Process for the direct reduction of metallic oxides
A process is described for the direct reduction of metallic oxides, primarily iron ore, to form sponge iron in a direct reduction plant by means of reduction gases containing hydrogen, at least part of the water vapor produced by the reduction process and...
01/23/1979
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