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| Number | Title | Issue Date |
| 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 |
| 7083825 | Composition used in producing calcium-rich getter thin film An improved getter device and method for forming a calcium-rich getter thin film in an electronic vacuum device is disclosed. The getter device includes a powder of a Ca—Ba—Al ternary alloy composed of between 53% and 56.8% by weight of aluminum, from 36% to 41.... | 08/01/2006 |
| 6740138 | Molten steel producing method A method of producing a molten steel, including the steps of putting, in an electric furnace, an iron material and a carbon material, to melt the iron material and the carbon material and produce a high-carbon molten iron whose carbon content is not lower than 1%, s... | 05/25/2004 |
| 6689182 | Method and device for producing molten iron A method capable of suppressing damages to furnace wall refractories in a melting furnace and making the working life of them longer and a technique capable of obtaining a molten iron with homogenized composition while keeping a high productivity upon arc... | 02/10/2004 |
| 6391081 | Metal purification method and metal refinement method A metal purification method and a metal refinement method in which metals of high purity can be easily refined and recovered without increasing the size of the purification and refining devices or complicating the operation. To this end, metals containing... | 05/21/2002 |
| 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 |
| 6264723 | Method for manufacturing steel A method and a plant for manufacturing steel in an electric steel furnace wherein the electric steel furnace is charged with at most 70% scrap and with at most 60% liquid pig iron obtained in a mini-blast furnace, and optionally with additional iron carri... | 07/24/2001 |
| 6251156 | Method of producing molten iron in duplex furnaces This invention relates to a method for operation of a rotary hearth furnace in conjunction with an electric melter for production of high purity iron product having a range of silicon and manganese, with low sulfur and phosphorus content. The method inclu... | 06/26/2001 |
| 6162274 | Steel production method A steel production method including preparing reduced iron pellets, taking a first portion of the reduced iron pellets and charging the first portion of the reduced iron pellets in a submerged electrical arc furnace such that a sufficient amount of hot me... | 12/19/2000 |
| 6155333 | Continuous electric steelmaking with charge preheating, melting, refining and casting An improved method and apparatus for preheating, melting, refining and casting of steel. The apparatus has a variable length secondary belt conveyor positioned in a charging area for introducing minute charge materials or slag formers, a skirted self-posi... | 12/05/2000 |
| 6068676 | Method and apparatus for producing high chromium content steels and/ or ferroalloys in an electric arc converter A method and an apparatus for producing steels with predominantly high Cr content and/or ferro-alloys, wherein the metal charge is melted in a melting crucible, is alloyed, refined and reduced, and wherein process gases are simultaneously supplied through... | 05/30/2000 |
| 5885328 | Method of agglomerating oil-containing steel mill waste A method of agglomerating oil-containing steel mill waste includes the step of combining a first steel mill waste component with a second steel mill waste component to form a mixture. The first waste component includes substantially dry non-oily steel mil... | 03/23/1999 |
| 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 |
| 5849062 | Method for recovering metallic materials of gas generator for air bag To provide a method for taking out gas generators readily from waste vehicles and then recovering metallic materials of gas generators taken out efficiently. The method is comprised by a) crushing waste vehicles in which air bag apparatuses are installed ... | 12/15/1998 |
| 5810905 | Process for making pig iron A process for producing pig iron from iron ore fines wherein the fines are partially reduced in a fluid bed reactor and, without pelletizing, briquetting or otherwise agglomerating the partially reduced fines, injecting them with a lance below the surface... | 09/22/1998 |
| 5800591 | Method and apparatus for feeding a steelmaking furnace A heat processing furnace is provided with a bifurcated feeder which allows scrap steel to be introduced to the furnace from an associated preheater, and direct reduced iron, slag formers, carburizers, and other alloys to be introduced through a lower cha... | 09/01/1998 |
| 5738823 | Meltdown apparatus To improve operation, particularly to allow more universal use, in which both liquid and solid crude metal, especially iron can be refined in only one reactor vessel, a reactor vessel (1) is of converter-like design with a relatively large space above a m... | 04/14/1998 |
| 5547487 | Amorphous metal alloy and method of producing same A process is described for producing amorphous metal alloys wherein impure ferrophosphorus slag, a by-product from a phosphorus-producing electric furnace, is used to supply phosphorus, chromium, vanadium and iron values to such alloys by mixing it with i... | 08/20/1996 |
| 5518518 | Amorphous metal alloy and method of producing same A process is described for producing amorphous metal alloys wherein impure ferrophosphorus slag, a by-product from a phosphorus-producing electric furnace, is used to supply phosphorus, chromium, vanadium and iron values to such alloys by treating the fer... | 05/21/1996 |
| 5514331 | Method and device for producing stainless steel The invention relates to a method and device for producing stainless steel, comprising methods for creating a ferroalloy, such as ferrochromium, and for further processing the alloy in order to produce a desired stainless steel. According to the invention... | 05/07/1996 |
| 5493580 | Process for recycling the filter dust in an electric arc furnace for producing steel The present invention relates to a process of recycling filter dust obtained during the production of steel in an electric arc furnace. Filter dust is injected and mixed with the smalls of carbon containing material in the slag or at the interface between... | 02/20/1996 |
| 5348567 | Decontamination method A method for decontamination of steel components contaminated with radioactive material comprises the steps: (a) providing a mass of material including: (i) a proportion of steel carrying radioactive material; and (ii) a mass of slag forming material; (b) melting t... | 09/20/1994 |
| 5322544 | Melting a mixture of scrap metal using scrap rubber This invention relates to the melting of scrap metal containing steel in an electric arc furnace using whole scrap rubber tires as an additional source of heat. Also, scrap rubber may be pylarized to form combustibles which are fed into the electric arc f... | 06/21/1994 |
| 5297160 | Furnace electrode design An arc furnace comprising a furnace vessel having a transverse axis and a central axis, electrodes disposed on a graduated circle, the electrodes projecting into the furnace vessel parallel to the central vertical axis, the electrodes are mounted on an el... | 03/22/1994 |
| 5296015 | Method for the pneumatic transport of large iron-bearing particles In a method of producing iron and steel, from iron ores largely composed of iron oxides, wherein a direct reduction process is used to produce a solid particulate intermediate product, generally known as sponge iron or Direct Reduced Iron (DRI); pneumatic... | 03/22/1994 |
| 5218617 | Apparatus for feeding iron-bearing materials to metallurgical furnaces A method and apparatus for feeding iron-bearing particles into a metallurgical furnace such as an electric arc furnace, comprising a vessel for containing a bath of molten iron, having a wall extending above the bath of molten iron, a preferably screw typ... | 06/08/1993 |
| 4906522 | Compounds of nickel, iron and phosphorus Compositions of nickel, iron and phosphorus, are prepared by fusing nickel and ferrophosphorus in an inert atmosphere, with the nickel preferably comprising from about 5% to about 70% by weight of the composition. The fused composition is ground or atomiz... | 03/06/1990 |
| 4875933 | Melting method for producing low chromium corrosion resistant and high damping capacity Fe-Mn-Al-C based alloys This invention describes the melting of Fe-Mn-Al Alloys and includes production methods such as non-continuous casting, continuous casting, hot forging, hot rolling, cold rolling, surface finishing, and heat treating. Products produced using one or more o... | 10/24/1989 |
| 4808219 | Method for treating metal melts and apparatus for carrying out the method A treatment of metal melts comprising the addition of chemically active substances or alloying elements with subsequent mixing taking place as a result of electromagnetic force exerted on the metal melt. The melt, which fills a substantially cylindrical v... | 02/28/1989 |
| 4797154 | Plant to convert a metallic charge into semifinished products, and connected smelting and casting method Integrated plant (10) to convert a metallic charge continuously into semi-finished products such as billets, blooms, slabs, bars or ingots, which comprises in close cooperation a chamber (14) to pre-heat a controlled metallic charge, the chamber (14) incl... | 01/10/1989 |
| 4780132 | Plasma fired cupola A plasma-fired cupola may be operated at very low gas flow levels in the range of 0.9 SCFM per sq. inch of cupola cross-sectional area and with recirculated off-gas substantially reducing the rate at which coke is burned thus reducing the sulfur content o... | 10/25/1988 |
| 4775521 | Process for the production of ferrous sulphide Ferrous sulphide is produced by forming a melt of a source of sulphur, suitably flotation grade iron pyrites, and a source of iron, suitably steel, in an electric induction furnace until reaction has ocurred, allowing a slag to form and removing the slag ... | 10/04/1988 |
| 4767451 | Method of operating an electric arc furnace In the method of producing steel by providing a vessel containing ferrous metal to be melted and passing electric current into the metal to melt the same by means of at least one electrode connected to an exterior source of electrical power, the improveme... | 08/30/1988 |
| 4764210 | Production of liquid iron The invention relates to a method for producing liquid in an electric melter or furnace. The method relates to producing liquid iron in an electric melter, utilizing highly reduced sponge iron, which is defined as sponge iron resulting from reduction of i... | 08/16/1988 |
| 4690385 | Method for storing and maintaining the temperature of molten metal An apparatus (1) for storing and maintaining the temperature level of molten metals, such as a cast iron melt which has been treated with pure magnesium. The apparatus includes a heatable furnace chamber (3) having a pressure-tight cover (4) and an inlet ... | 09/01/1987 |
| 4681625 | Methods for simultaneously desulfurizing and degassing steels A method is provided for removing sulfur and hydrogen from steel by the steps of pouring a stream of steel, low in oxygen and free of slag into a vertical tube installed in a ladle which extends from the bottom of the ladle to the top of the ladle, provid... | 07/21/1987 |
| 4655826 | Method for post-melting treatment of molten steel Molten steel is refined by a method that includes the steps of isolation from contact with the ambient and atmosphere, motion of the molten steel so that portions of the molten steel remote from the surface up to the surface, and addition of heat to the p... | 04/07/1987 |
| 4609400 | Method and apparatus for preheating charge materials for continuous steelmaking A method and apparatus for the continuous preheating of charge materials for an electric steelmaking furnace operation including provision for preheating with both off-gas from the furnace and burners in the preheating chamber. Seals are provided to preve... | 09/02/1986 |
| 4604135 | Apparatus and process for the metallurgical aftertreatment of premelted metals The invention relates to an apparatus for the metallurgical aftertreatment of premelted metals, especially steel, consisting of a cylindrical ladle receiving the melt and closed by means of a cover and one or more electrodes passing through the cover and ... | 08/05/1986 |
| 4514218 | Reduced iron melting method using electric arc furnace Molten metal is pooled at the bottom of an electric arc furnace and a layer of slag is formed overlying the molten metal. Electric arcs are formed between the electrodes and molten metal, the arcs piercing through the slag layer to heat the molten metal a... | 04/30/1985 |
