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| Number | Title | Issue Date |
| 6749661 | Method for melting and decarburization of iron carbon melts A method and an apparatus for advantageously introducing a flame and a high velocity oxidizing gas into a furnace for metal melting, refining and processing, particularly steel making in an electric arc furnace. The steel making process of an electric arc furnace is... | 06/15/2004 |
| 6635096 | Method for optimizing the operating conditions of a submerged arc furnace A method for producing molten metal by the reduction and melting of raw materials in a submerged arc type electric furnace includes at least one electrode, where substantial amounts of slag are generated so that the electric furnace contains a bath of mol... | 10/21/2003 |
| 6500224 | Method for operating a steelmaking furnace during a steelmaking process The invention is directed to a method for operating a steelmaking furnace including the steps of charging steelmaking materials into the steelmaking furnace, blowing oxygen into the steelmaking furnace, discontinuing the oxygen blow when the charged steel... | 12/31/2002 |
| 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 |
| 6162280 | Process for heat treatment of organically contaminated material The technical problem of the invention is to create a process where the second layer is of higher sintering quality and improved waste gas values are achieved. The process according to the invention for the thermal transformation of materials containing o... | 12/19/2000 |
| 6077324 | Method for producing alloyed steels In a method for producing alloyed steels, wherein in a first manufacturing step iron carriers are to a great extent decarburized and dephosphorized by means of oxygen and after removal of the slag resulting therefrom the melt is adjusted to the desired al... | 06/20/2000 |
| 5925165 | Process and apparatus for the 3-stage treatment of solid residues from refuse incineration plants In a method for processing solid residues from refuse incineration plants the slag is melted and heavy metals from the melt (16) are separated for reutilization. The slag is directly transferred from the refuse incineration plant into a first heating cham... | 07/20/1999 |
| 5902372 | Process and apparatus for processing a shredder light fraction in a melt A process and apparatus for processing a shredder light fraction including multi-duct nozzle having at least an end section positionable within a metallurgical vessel containing a molten metal bath. The shredder light fraction may be fed into the molten m... | 05/11/1999 |
| 5876483 | Method and furnace for disposal of steel-making waste, and operating method of the furnace A melting furnace for reforming steel-making slag so as to be available, for example, to roadbed ballast by mixing steel-making dust with the slag in molten states, which is provided with a fuel oxygen burner for melting the slag and the dust, a slag char... | 03/02/1999 |
| 5851263 | Process for smelting steel in an electric arc furnace, and electric arc furnace for its implementation A process for smelting steel is implemented in an electric arc furnace of the type including a vessel containing a bath of molten steel, a roof resting on top of the said vessel and a single roof electrode or a plurality of roof electrodes lying within a ... | 12/22/1998 |
| 5700308 | Method for enhancing reaction rates in metals refining extraction, and recycling operations involving melts containing ionic species such as slags, mattes, fluxes A method and apparatus for enhancing reaction rates between ionic species such as slags, mattes, fluxes and the like with at least another component such as similar melts, metals, chemical compounds, gases or any combination thereof during metal processin... | 12/23/1997 |
| 5694413 | Procedure and apparatus for continuous supply of heat in electrically conductive bulk goods The invention relates to a procedure for continuous supply of heat into electrically conductive bulk goods by exploiting the electrical resistance thereof in an oven chamber with an inlet opening and a drawing-off apparatus for continuous throughput of bu... | 12/02/1997 |
| 5602867 | Method of and device for operating an arc furnace with two vessels An arrangement for operating an arc furnace with two vessels for making steel. Enough liquid raw iron is added to account for 70% of the total starting metallurgicals. The supply of electricity to one of the vessels is discontinued but not to the other ve... | 02/11/1997 |
| 5562753 | Method and installation for producing molten steel from ferrous materials rich in carbonaceous materials Both a method and apparatus for producing molten steel are provided wherein ferrous materials rich in carbonaceous materials are fused in a first vessel of a single electric furnace having separate first and second vessels. The carbonized molten metal thu... | 10/08/1996 |
| 5395420 | Process for using foamed slag in stainless steel production In the production of stainless steels, it is possible to use foamed slag, with great advantages, by using a metal charge with specific carbon and silicon contents, by insufflating limestone and carbon, by controlling the amount of employed oxygen and by m... | 03/07/1995 |
| 4986847 | Process and apparatus for at least temporarily simultaneously subjecting a molten metal to the action of a gas and fine-grain solid materials In a process for at least temporarily simultaneously subjecting a molten metal (5) in a metallurgical vessel (3) to the action of a gas and fine-grain solid materials, with a water-cooled first lance (17) for supplying the gas, in accordance with the inve... | 01/22/1991 |
| 4957542 | Process for treating liquid steels by injecting gas through the ladle bottom A process for the in-ladle treatment of liquid steels by injecting gas through the ladle bottom. The process comprises injecting at least one inert gas from locations which are distributed over the ladle bottom in such a way as to form at the surface of t... | 09/18/1990 |
| 4749408 | Method of bottom blowing operation of a steel making electric furnace In an electric furnace for producing ordinary steels, alloy and others by arc heat of electrodes incorporated with gas blowing from a furnace bottom into dissolving and refining, plugs having fine pipe holes as gas blowing means are positioned in space ea... | 06/07/1988 |
| 4531973 | Metallurgical processes The invention relates to various energy saving measures for use in the smelting, refining and melting of metals, and in particular in the manufacture of steels, alloy steels and ferrous alloys. In such processes fuel consumption is reduced and efficiency ... | 07/30/1985 |
| 4522650 | Process for production of low phosphorus alloy Herein is disclosed a process for producing an alloy of low phosphorus content by means of a furnace equipped with a lance for injection. The process is characterized by producing an alloy of low phosphorus content and at the same time by gasifying the ca... | 06/11/1985 |
| 4511396 | Refining of metals This invention uses a dual basicity (DB) flux during the refining of steel which comprises the use of one or more flux components with high basicity/activity, for example sodium carbonate and/or barium oxide, with one or more normal fluxes having a lower ... | 04/16/1985 |
| 4445933 | Method of refining molten steel An improved method of refining molten steel is disclosed. Inert gas such as argon is injected into the molten steel in a refining vessel through tuyeres at the bottom and blown through a lance from the top of the vessel. The method is particularly useful ... | 05/01/1984 |
| 4419128 | Continuous melting, refining and casting process In a continuous melting, refining and casting process which comprises, substantially in series, a step of melting and carburizing steel scrap, iron scrap and/or reduced iron as a raw material in a combustion-type melting furnace, a refining step by blowin... | 12/06/1983 |
| 4401466 | Process for protection of nozzles and refractory lining of a vessel for refining molten metal A process for protecting oxygen injection nozzles and the surrounding refractory lining of a molten metal refining vessel having such oxygen injection nozzles beneath the bath surface. The injection nozzle comprises at least three concentric pipes, the ce... | 08/30/1983 |
| 4396421 | Method of, and arrangement for, producing molten pig iron or steel pre-material In a method of, and arrangement for, producing molten pig iron or steel pre-material iron-oxide-containing raw-material particles are top-charged into a fluidized bed formed of carbon particles and an oxygen-containing carrier gas. When passing the fluidi... | 08/02/1983 |
| 4246023 | Method and apparatus for the refining of iron-based melts An apparatus and a method of operating an apparatus for the refining of a ferrous melt make use of a ladle with a removable cover provided with a porous plug at its bottom through which an inert gas is introduced. A direct current source is connected to a... | 01/20/1981 |
| 4214898 | Process for preventing the rephosphorization of electric steel This invention relates to a process for preventing the rephosphorization phenomenon in which, during the production of killed steel in a basic electric furnace, a part of the phosphorus oxide formed and removed in the oxidizing period is reduced in the su... | 07/29/1980 |
| 4200452 | Method for the refining of iron-based melts A method of and an apparatus for the refining of a ferrous melt makes use of a ladle with a removable cover provided with a porous plug at its bottom through which an inert gas is introduced. A direct current source is connected to a carbon electrode in c... | 04/29/1980 |
| 4168968 | Steelmaking process A cold charge of steel scrap is melt cut and melted in an arc furnace provided with special oxygen-fuel burners by which rapid melting is promoted, the interior of the furnace being maintained under negative pressure by a fume evacuation and filtration me... | 09/25/1979 |
| 4014681 | Vehicle recycling process A vehicle recycling plant comprising a furnace, means for introducing a fuel into said furnace, a cupola disposed in close proximity to said furnace, and communicating therewith so that the hot gases discharged from the furnace are introduced into the cup... | 03/29/1977 |
| 4014685 | Manufacture of steel The invention is concerned with the desulphurizing of molten steel by the use of a lime-based flux. In addition to lime the flux includes sodium carbonate, an alkali metal or alkaline earth metal fluoride, typically fluorspar, alumina and a metallic reduc... | 03/29/1977 |
| 3999977 | Method for controlling the injection of flux into a steelmaking vessel as a function of pressure differential This invention is directed to a method and apparatus for controlling the injection of flux into a steelmaking vessel as a function of the differential pressure between the flux containing tank and the main conduit which supplies oxygen to the tuyeres of t... | 12/28/1976 |
| 3953196 | Process for the direct reduction of metal oxides Metal oxides are directly reduced by charging metal oxide-carbonaceous agglomerates to a shaft furnace, passing said pellets downwardly countercurrent to a flow of hot gases in a reduction zone, wherein the agglomerates are heated to 2000°-2400°F. and r... | 04/27/1976 |
| 3945820 | Process and immersion lances for introducing oxygen into a metal melt Immersion lances for refining metal melts in hearth type vessels including open hearth and electric furnaces. The lances are movable into and out of the metal melt and comprise an oxygen pipe, a cooling medium pipe surrounding the oxygen pipe and a refrac... | 03/23/1976 |
