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| Number | Title | Issue Date |
| 7435281 | Pyrometallurgic process for the treatment of steelwork residues A pyrometallurgic process for the treatment of post-steelwork residues, comprises the following phases: preparing a furnace (1) of the electric type, suitable for the introduction of the residues; preparing the residues, for example in a hopper with the possi... | 10/14/2008 |
| 7169205 | Method for producing a melt iron in an electric furnace A process for producing liquid smelting iron in an electric arc furnace includes several electrodes, equipped with a hearth, and containing a heel covered with a non-foaming liquid slag. The process further includes the reduction of the metallic fines, in order to f... | 01/30/2007 |
| 6562096 | Management of electric arc furnace dust through a basic oxygen furnace A method of processing electric arc furnace (EAF) dust which involves processing the EAF dust through a basic oxygen furnace (BOF). The method encompasses recovery of iron value from the EAF dust and the concentration of zinc into a material that has more... | 05/13/2003 |
| 6395052 | Method for producing directly-reduced iron, liquid pig iron and steel The invention relates to a process for producing directly reduced iron, liquid pig iron and steel, in which charge materials, which are formed from iron ore, preferably in lump and/or pellet form, and, if appropriate, additions, are reduced directly, in a... | 05/28/2002 |
| 6395057 | Method for producing directly reduced iron in a layered furnace A method for producing reduced iron in a layered furnace which includes several superimposed layers. Ore is continuously fed into the layered furnace, deposited on the uppermost layer, and gradually transferred to the lower layer. A reducing agent is depo... | 05/28/2002 |
| 6375701 | Method of judging slag forming state in electric furnace steel production and method of operating electric furnace The state of slag foaming generated in an electric furnace steel manufacture is judged by measuring the NOx amount in exhaust gas. The foaming state is adjusted to completely interrupt the contact of melted steel with air so that low nitrogen o... | 04/23/2002 |
| 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 |
| 6206948 | Metal reduction and melting process and apparatus A metal reduction and melting process which involves the heating of a burden comprising a metal containing component and a carbon containing component in a channel type induction furnace in order to reduce such metal containing component, in which at leas... | 03/27/2001 |
| 6136059 | Process for reducing the electric steelworks dusts and facility for implementing it A process for processing electric steelworks dusts containing oxidized high-iron, zinc-bearing materials in order to recover iron and zinc from [them] said dusts. The process includes the steps of: feeding the dusts to an induction furnace partially fille... | 10/24/2000 |
| 6083294 | Method of treating dust exhausted from melting furnace A method of treating dust exhausted from a melting furnace in melting an iron-contained material, comprising the steps of: melting the iron-contained material, with air inside the melting furnace shut out from outside air and collecting the dust from the ... | 07/04/2000 |
| 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 |
| 5961688 | Process and device for making liquid iron by non-electric and electric smelting A process and a steelmaking device for the metallurgical treatment of iron metals, especially for producing steel melts. To carry out metallurgical processing of iron metals, and especially to produce steel melts, in an energy-saving, environmentally frie... | 10/05/1999 |
| 5611838 | Process for producing an iron melt There is disclosed a process for producing an iron melt in a reactor with current supply. In order to utilize fine-grained iron carriers in a particularly economic manner while minimizing the energy input when carrying out such process in an electric arc ... | 03/18/1997 |
| 5541952 | Apparatus and method of preheating steel scrap for a twin shell electric arc furnace Apparatus and methods of abating the objectionable emissions of volatile hydrocarbons generated during the preheating cycle of a twin vessel electric arc furnace steelmaking operation wherein the vessels cycle between a powered or melting state and an unp... | 07/30/1996 |
| 5366538 | Process for the production of a metal melt In a process for the production of a metal melt in a metallurgical vessel, the filter dusts incurring in producing the metal melt are to be processed to charging substances without causing a load on the environment and without great expenditures. This is ... | 11/22/1994 |
| 5316565 | Carbothermic reduction product gas treatment Method and apparatus for reducing the quantity of carbon dioxide emitted to the atmosphere from carbothermic processes producing metals are described. The method involves rejecting carbon from the process system or using carbon as a reagent to be recycled... | 05/31/1994 |
| 5264020 | Smelting plant with two melting furnaces arranged in juxtaposed relationship In a smelting plant including two melting furnaces which are arranged in juxtaposed relationship and which are operated alternately, wherein the furnace gases which are produced in the melting process are respectively introduced into the other melting fur... | 11/23/1993 |
| 4950324 | Tri-level method and apparatus for post melting treatment of molten steel This invention relates to a new method for the post melting treatment of molten steel in all, or nearly all, of the post melting systems in use at this time to lower the oxygen, hydrogen, and, to some extent, the nitrogen content thereof, and carry out th... | 08/21/1990 |
| 4898712 | Two-stage ferrosilicon smelting process The present invention relates to a process for the production of ferrosilicon in a closed two-stage reduction furnace. In the present invention, carbon monoxide released as a result of the smelting process, in the first stage of the furnace, is used to pr... | 02/06/1990 |
| 4692113 | System using electric furnace exhaust gas to preheat scrap for steelmaking Dust containing high-temperature gas exhausted from an electric steelmaking furnace is directed through scrap preheaters, wherein scrap that is to be charged into said electric furnace is preheated. The absorption of some of the heat from the exhaust leav... | 09/08/1987 |
| 4577838 | Treatment of pelletized iron ores A system for providing thermal and chemical energies for the production of pelletized iron ore concentrates while allowing a reduction of a portion of the material in process. The material in process is introduced as ore fines, pelletized and fired in an ... | 03/25/1986 |
| 4531971 | Method of and apparatus for melting scrap A method of melting iron scrap using an arc furnace with reduced electric power consumption. In one of a pair of vessels which are arc furnace bodies, melting of the scrap by heat of arc is carried out while a carbonaceous material and oxygen-containing g... | 07/30/1985 |
| 4514219 | Method of producing molten metal A furnace for the melting of ferriferous materials, namely, iron scrap, pig iron and sponge iron having a low oxygen content, is operated by the addition of coke to the charge so that the quantity of coke substantially is equal to that required to carburi... | 04/30/1985 |
| 4464197 | Method for making iron by induction heating An improved method and apparatus for making metallic iron from iron ore including low-grade ore by the use of a solid reductant such as coal in a completely enclosed system wherein the heat for reduction originates from induction coils surrounding a verti... | 08/07/1984 |
| 4434001 | Method for manufacturing metal from fine-grain metal-oxide material A method for producing fine-grain iron-containing metal oxide material, the method comprising a first reduction stage wherein the oxide material is at least partially reduced in a fluidized state at a temperature of approximately 1025°-1275° K. by a red... | 02/28/1984 |
| 4421553 | Process for operating a blast furnace In a method of controlling a blast furnace wherein iron ore is reduced to form pig iron and there being at least one reactor used for heating a reducing gas which reducing gas is introduced to at least one tuyere, the improvement being the steps of adjust... | 12/20/1983 |
| 4416689 | Process for the manufacture of crude iron and energy-rich gases A process for preparing crude iron and energy-rich, gases, the raw materials being comprised of iron ore concentrate, carbon-containing materials, optionally oxygen gas and electric energy, comprising the combination of the following operations: 1.1: preh... | 11/22/1983 |
| 4394163 | Process for the manufacture of crude iron and synthesis gas In a combined process crude iron and a synthesis gas particularly suitable for the preparation of methanol are prepared by supplying iron ore concentrate to the plasma zone between an electrode and a crude iron melt in an arc furnace, while injecting gase... | 07/19/1983 |
| 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 |
| 4318736 | Method for manufacturing steel from iron ore dust by direct reduction The invention relates to methods and apparatus for manufacturing steel from iron ore dust by direct reduction. The iron ore dust is preheated, then reduced with a gas mixture contaning monoxide. Thereafter, the reduced product is charged by means of a gas... | 03/09/1982 |
| 4306903 | Method for reducing particulate iron oxide to molten iron with solid reductant and oxy-fuel burners A method and apparatus for reducing particulate iron oxide to molten iron utilizing solid carbonaceous fuel as reductant in a shaft type reducing furnace, in which a furnace burden is formed of a mixture of iron oxide lumps or pellets and particulate soli... | 12/22/1981 |
| 4290800 | Process for feeding iron sponge into an electric arc furnace Iron sponge, containing at least 0.5% carbon, is preheated with an oxidizing gas as the gas flows in a direction traverse to the direction of the sponge, without combustion of the iron sponge.... | 09/22/1981 |
| 4280836 | Method of preheating iron scraps in steel-making by the electric arc furnace A method of preheating iron scraps in steel-making by the electric arc furnace, by utilizing high-temperature exhaust gas to be discharged from the electric arc furnace. This method shortens, to a large extent, the time required for melting iron scraps an... | 07/28/1981 |
| 4179278 | Method for reducing particulate iron oxide to molten iron with solid reductant A method for reducing particulate iron oxide to molten iron utilizing solid carbonaceous fuel as reductant in a shaft type reducing furnace, in which a furnace burden is formed of a mixture of iron oxide lumps or pellets and particulate solid fuel. Reacte... | 12/18/1979 |
| 4156102 | Method for producing ferro-alloys An improved method and apparatus for producing ferro-alloys from ore in which an ore is first mixed with a solid reducing agent, preheated and pre-reduced in a rotary kiln, and smelted in an electric furnace, in which the pre-reduced ore is heated by a bu... | 05/22/1979 |
| 4111687 | Process for the production of intermediate hot metal A process and apparatus for the production of intermediate hot metal suitable for further refining into steel is disclosed. The basic process includes the steps of heating a charge of ore in a reducing furnace having a reducing atmosphere therein comprising a ... | 09/05/1978 |
| 4087274 | Method of producing a partially reduced product from finely-divided metal sulphides There is provided a method of producing a partially reduced product from finely divided metal oxide containing material. The product is suited for continued reduction and the material containing the metal oxide may be an ore concentrate or an oxidic inter... | 05/02/1978 |
| 4082543 | Method for reducing particulate iron oxide to metallic iron with solid reductant A method and apparatus for reducing particulate iron oxide to metallic iron utilizing solid carbonaceous fuel as reductant in a shaft type reducing furnace, in which a furnace burden is formed of a mixtue of iron oxide lumps or pellets and particulate sol... | 04/04/1978 |
| 4076954 | Method and an electrically heated device for producing molten metal from powders or lumps of metal oxides This invention is related to a method and a process for producing metals by reducing and smelting metal oxides in two steps, the first of said steps comprising prereduction of a metal oxide charge. The prereduced metal oxide is transferred directly to the... | 02/28/1978 |
