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| Number | Title | Issue Date |
| 7608129 | Method and apparatus for producing direct reduced iron A direct reduction process for producing direct reduced iron (DRI) in a reduction reactor having a reduction zone for reducing iron-oxides-containing particles, such as iron ore pellets, to DRI by reaction of said iron oxides with a high temperature reducing gas, an... | 10/27/2009 |
| 7175690 | Pre-treatment process for feed material for direct reduction process A pretreatment process for solid lump feed material for a gas and pellet/lump-based direct reduction process, comprising preheating feed material to a temperature of from about 200 C to about 500 C, without reduction, in a non-reducing atmosphere prior to charging t... | 02/13/2007 |
| 6602317 | Method and apparatus for controlling temperature uniformity of the burden in a direct reduction shaft furnace A method and apparatus for increasing hydrocarbons to a direct reduction shaft furnace while controlling the temperature uniformity of the center portion of the iron burden wherein the hydrocarbon gases used in direct reduction may be preheated, which inc... | 08/05/2003 |
| 6562103 | Process for removal of carbon dioxide for use in producing direct reduced iron The present invention relates to a pressure swing adsorption process for direct reduction of iron wherein a portion of spent reducing gas withdrawn from the direct reduction reactor is subjected to a PSA process for the removal of carbon dioxide from the ... | 05/13/2003 |
| 6506230 | Method for increasing productivity of direct reduction process An improved method and apparatus for increasing the productivity of a direct reduction process in which iron oxide is reduced to metallized iron by contact with hot reducing gas; comprising the steps of: a) providing a first hot reducing gas consisting es... | 01/14/2003 |
| 6478841 | Integrated mini-mill for iron and steel making Disclosed is a method for steel making which includes charging a direct reduction reactor (DRR) with iron ore from a charging system. The iron ore is reduced to hot direct reduced iron (DRI) in the DRR and discharged to rotary kiln(s). The rotary kiln(s) ... | 11/12/2002 |
| 6395055 | Method 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 reducing gas flows in counter-flow with respect to the material introduced into the furnace, comprising the followi... | 05/28/2002 |
| 6395056 | Method for the heat treatment of iron ore lumps in a reduction system A method and apparatus for the production of prereduced iron ore, DRI, sponge iron or the like by the gaseous reduction of iron-oxide containing particles in a reduction system which comprises a preheating device for the iron ore particles. The preheating... | 05/28/2002 |
| 6372009 | Method for reducing CO and VOC's in steelmaking furnace off-gas stream without forming or exhausting undesirable products A process and apparatus for continuously reducing carbon monoxide (CO), uncombined free hydrogen (H2) and volatile hydrocarbons (VOC's) in molten metal refining vessel off-gases without forming undesirable oxides of nitrogen. Off-gases are dire... | 04/16/2002 |
| 6319301 | Method 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 |
| 6293992 | Method and device for processing reducing gas for reducing ores 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... | 09/25/2001 |
| 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 |
| 5447551 | Method and apparatus for the removal of hydrogen sulfide from a process gas stream An improved method and apparatus for forming metallized iron by direct reduction of particulate iron oxide is disclosed. Spent reducing gas is recycled from the reduction furnace through a cooler-scrubber and a catalyst-containing stoichiometric gas refor... | 09/05/1995 |
| 5437708 | Iron 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 |
| 5407460 | Method for improving quality of reforming gas used in the direct reduction of metal oxides A method for modifying existing direct reduction processes and retrofitting existing direct reduction facilities so as to increase the capacity of the facilities without the need for increasing the capacity of external reformers associated with the existi... | 04/18/1995 |
| 5340378 | Method and apparatus for producing low sulfur metallized pellets An improved method and apparatus for forming metallized iron by direct reduction of particulate iron oxide is disclosed. Spent reducing gas is recycled from the reduction furnace through a cooler-scrubber and a catalyst-containing stoichiometric gas refor... | 08/23/1994 |
| 5078787 | Method and apparatus for the production of hot direct reduced iron A method and apparatus for the gaseous reduction of particulate iron ores, wherein the ore or is fed to a vertical moving bed direct reduction reactor, reduced therein, and discharged as hot sponge iron. The ore is charged to the top portion of the reduct... | 01/07/1992 |
| 4900356 | Process and apparatus for producing metallized pellets and scrubbing spent reducing gas An improved method and apparatus for producing metallized iron or other metal by direct reduction of particulate metal oxide is disclosed. Spent reducing gas is recycled from a reduction furnace through a cooler-scrubber and a catalyst-containing stoichio... | 02/13/1990 |
| 4897113 | Direct 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 |
| 4880459 | Method of and apparatus for reducing iron oxide to metallic iron This invention relates to a method and apparatus for reducing iron oxide to metallic iron, utilizing a continuous process employing a reducing gas with high hydrogen and carbon monoxide content made by a catalytically reforming mixture of hydrocarbons, re... | 11/14/1989 |
| 4834792 | Method for producing hot sponge iron by introducing hydrocarbon for carburizing into reduction zone A method and apparatus for the direct gaseous reduction of iron ore to sponge iron at an elevated temperature suitable for hot briquetting, wherein a hot reducing gas is circulated upwardly through a descending body of iron ore and a make-up reducing gas ... | 05/30/1989 |
| 4822411 | Integrated steel mill arrangement When operating mills including a coling plant, a blast furnace arrangement and a converter steelworks, large amounts of partially high-grade so-called cupola gases, such as coke oven gas and converter exhaust gases, form, which cupola gases, so far. In or... | 04/18/1989 |
| 4752329 | Apparatus and method for increasing carbon content of hot directly reduced iron A method of producing a hot, carburized metallized iron product in a generally vertical shaft furnace having an upper reducing zone in which iron oxide reacts with a gaseous reductant, and a lower carbon control and product discharge zone, including: esta... | 06/21/1988 |
| 4735653 | Process for the direct reduction of sulphurous iron ores An apparatus for the direct reduction of sulphurous iron ores with a shaft furnace, in which the ore is reduced in counterflow to the reducing gas is described, the waste gas being subdivided into two streams following the furnace. One stream heats and de... | 04/05/1988 |
| 4591380 | Method of generating a reducing gas A method for forming a reducing gas in a molten metal bath gasifier and simultaneously directly reducing iron oxide in a shaft furnace with the gas thus produced, wherein the bath coolant is preferably provided by cleaned recycle gas from the direct reduc... | 05/27/1986 |
| 4566904 | Process for the production of iron With the process for the production of iron from an iron-oxygen combination, preferably ore, the iron-oxygen combination is essentially reduced in an ore reduction vessel with a reaction gas from a melting crucible, then supplied to this melting crucible ... | 01/28/1986 |
| 4556417 | Process for the direct reduction of iron ores The present invention relates to a process for the production of metallic iron through direct reduction of iron ores and particularly to an optimized process which permits operation at higher reducing temperatures with minimized problems of sinterization ... | 12/03/1985 |
| 4536213 | Reforming of higher hydrocarbons for metal oxide reduction A method for utilizing pentane and higher hydrocarbons in a shaft furnace direct reduction process without any special treatment and without any special reforming catalyst, and in particular a method for the reforming of such higher hydrocarbons in conjun... | 08/20/1985 |
| 4528030 | Method of reducing iron ore A process for the gaseous reduction of iron ore to sponge iron in a vertical shaft, moving bed reactor wherein a hot gaseous mixture of hydrogen and a carbon monoxide is used to reduce the ore. It has been found unnecessary to use the external catalytic r... | 07/09/1985 |
| 4428772 | Method for reducing metal ore A method is disclosed for achieving improved reduction efficiency and economy in the reduction of particulate metal ores, e.g. iron ore, in a vertical shaft, moving bed reactor having a reduction zone in which a heated reducing gas is caused to flow throu... | 01/31/1984 |
| 4370162 | Method for the gaseous reduction of iron ore to sponge iron Process and apparatus for the gaseous direct reduction of iron ores wherein at least a portion of the spent reducing gas effluent from a reduction reactor is upgraded and thereafter heated and recycled to said reactor forming a reducing gas loop and make-... | 01/25/1983 |
| 4363654 | Production of reducing gas for furnace injection A process for producing a reducing gas for a direct reduction or blast furnace which comprises partially oxidizing oil and/or coal and/or coke in the presence of air to produce a gas stream containing hydrogen and nitrogen together with other gases, treat... | 12/14/1982 |
| 4362555 | Method and apparatus for manufacturing sponge iron Disclosed are a method and apparatus for manufacturing sponge iron by the continuous reduction of iron oxides in a shaft utilizing recirculation gases. Reaction gas is removed from the shaft furnace, substantially cleaned of all CO2 and H2... | 12/07/1982 |
| 4362554 | Method and apparatus for manufacturing sponge iron Disclosed are a method and apparatus for manufacturing sponge iron by the continuous reduction of iron oxides in a shaft utilizing recirculation gases. Reaction gas is removed from the shaft furnace, substantially cleaned of all CO2 and H2... | 12/07/1982 |
| 4351513 | Direct reduction of iron using coke oven gas Apparatus for the direct reduction of iron oxide utilizing sulfur-containing gas such as coke oven gas for the process gas. Sulfur-containing gas is heated by indirect heat exchange and injected into the furnace above the reduction zone to transfer the su... | 09/28/1982 |
| 4348226 | Direct reduction process for producing metallic iron A process for the direct reduction of iron oxide by blowing into a reduction furnace a reducing gas which is prepared by reforming a mixture of a reduction furnace exhaust gas and a gas mainly composed of methane, which comprises the steps of dividing the... | 09/07/1982 |
| 4338123 | Method 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 |
| 4336063 | Method and apparatus for the gaseous reduction of iron ore to sponge iron Process and apparatus for the gaseous direct reduction of iron ores wherein at least a portion of the spent reducing gas effluent from a reduction reactor is upgraded and thereafter heated and recycled to said reactor forming a reducing gas loop and make-... | 06/22/1982 |
| 4333761 | Method for direct reduction of iron using high sulfur gas A method for the direct reduction of iron oxide utilizing sulfur-containing gas such as coke oven gas for the process gas. Sulfur-containing gas is heated and injected into a shaft furnace above the reduction zone into a prereduction and sulfur transfer z... | 06/08/1982 |
| 4270739 | Apparatus for direct reduction of iron using high sulfur gas A method and apparatus for the direct reduction of iron oxide utilizing sulfur-containing gas such as coke oven gas for the process gas. Sulfur-containing gas is heated and injected above the reduction zone to transfer the sulfur to the hot burden. The ap... | 06/02/1981 |
