| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 075100140 |
Electrical induction
| 29 |
| 075100650 |
Melting or holding melt
| 18 |
| 075100190 |
Plasma
| 18 |
| 075100130 |
Electromagnetic wave energy (e.g., microwave, laser, etc.)
| 17 |
| 075100460 |
Adding solid treating agent, slag or flux
| 14 |
| 075100350 |
Reducing or smelting slag or dross as starting material
| 12 |
| 075100390 |
Adding gaseous treating agent
| 10 |
| 075100620 |
Reducing or smelting
| 9 |
| 075100120 |
Controlling process through sensed condition
| 7 |
| 075100640 |
Vacuum purifying or degassing | 5 |
| 20080257106 | Process for Producing a High-Cleanliness Steel - A process for producing a high-cleanliness steel which can produce, without relying upon a high-cost remelting process, steel products having cleanliness high enough to satisfy requirements for properties of mechanical parts used under severe environmental conditions. The production process comprises the steps of: transferring a molten steel produced in an arc melting furnace or a converter to a ladle furnace to refine the molten steel; subjecting the molten steel to circulation-type degassing; and casting the molten steel into an ingot, wherein, in transferring the molten steel to the ladle furnace, a deoxidizer including aluminum and silicon, is added to previously deoxidize the molten steel, that is, to perform tapping deoxidation before refining in the ladle refining furnace. | 10-23-2008 |
| 20100024596 | LOW COST MAKING OF A LOW CARBON, LOW SULFUR, AND LOW NITROGEN STEEL USING CONVENTIONAL STEELMAKING EQUIPMENT - A method of making a steel with low carbon less than 0.035% by weight including steps of preparing a heat of molten steel composition in a steelmaking furnace to a tapping temperature as desired for desulfurization at a VTD, tapping open into a ladle the molten steel composition with an oxygen level between about 600 and 1120 ppm, providing slag forming compound to the ladle to form a slag cover over the molten steel composition in the ladle, transporting the molten steel composition in the ladle to a VTD, decarburizing the molten steel composition at the VTD by drawing a vacuum of less than 650 millibars, after decarburizing, adding one or more deoxidizers to the molten steel composition and deoxidizing the molten steel composition, after deoxidizing, adding one or more flux compounds to desulfurize the molten steel composition, and casting the molten steel composition to form a steel with low carbon less than 0.035% by weight. | 02-04-2010 |
| 20100206128 | METHOD AND DEVICE FOR REMOVAL OF ELEMENTS RESOLVED IN A METAL MELT - Method for removal of elements from a metal melt in a container, which melt contains a base metal and elements of undesirable constituents, in which the metal melt is heated to a level maintaining the content melted. The metal melt is heated to a level causing vaporization of an element to be removed, but under the level providing gas pressure for the base metal. The container with the metal melt is brought under a reduced pressure in at least one compartment in which the temperature is maintained under the vaporization level of the element to be removed. A device for the removal of elements from metal melts, with a container ( | 08-19-2010 |
| 20120279350 | DEGASSING OF MARTENSITIC STAINLESS STEEL BEFORE REMELTING BENEATH A LAYER OF SLAG - The invention relates to a method of fabricating a stainless martensitic steel, comprising a step of electroslag remelting of an ingot of said steel then a step of cooling said ingot. Before the electroslag remelting step, the ingot undergoes vacuum degassing for a time that is sufficient to obtain a hydrogen content in the ingot of less than 3 ppm. | 11-08-2012 |
| 20120304820 | Process for Producing a High-Cleanliness Steel - A process for producing a high-cleanliness steel which can produce, without relying upon a high-cost remelting process, steel products having cleanliness high enough to satisfy requirements for properties of mechanical parts used under severe environmental conditions. The production process comprises the steps of: transferring a molten steel produced in an arc melting furnace or a converter to a ladle furnace to refine the molten steel; subjecting the molten steel to circulation-type degassing; and casting the molten steel into an ingot, wherein, in transferring the molten steel to the ladle furnace, a deoxidizer including aluminum and silicon, is added to previously deoxidize the molten steel, that is, to perform tapping deoxidation before refining in the ladle refining furnace. | 12-06-2012 |
| 075100360 |
Exhaust or top gas reused or treated | 5 |
| 20090031854 | Apparatus for the Combustion of Gas Exiting From a Furnace, for the Preheating of Scraps Entering the Furnace Itself and Related Process - An apparatus for the combustion of gas exiting from an electric arc furnace for the preheating of scraps entering the furnace itself foresees an insertion device of comburent substance into a preheating chamber or loading tunnel of the scrap metal having an inlet section of the scrap metal, a seal section to prevent an uncontrolled entrance of air in the tunnel, a heating section and an unloading section of the scrap metal in the furnace. Said insertion device of the comburent substance comprises one or more adjustable openings placed in the loading tunnel, and said apparatus comprises a device or a series of devices, also not equipped with autonomous movement, of mechanical seal nature placed in the insertion or inlet section of the scrap metal in the loading tunnel or preheating chamber. | 02-05-2009 |
| 20140373677 | Process for Carbothermic or Electrothermic Production of Crude Iron or Base Products - A process serves for the carbothermic/electrothermic production of crude iron or other base products in furnaces ( | 12-25-2014 |
| 20150344983 | FIXED-TYPE ELECTRIC FURNACE AND MOLTEN STEEL PRODUCTION METHOD - Provided are a fixed-type electric furnace enabling continuous operation which allows melting without the interruption of power supply and tapping in a fixed state, and a fixed-type electric furnace and a molten steel production method using same. The fixed-type electric furnace comprises: a preheating furnace which is disposed on the side of a melting furnace and preheats an iron source (scrap) using exhaust gas from the melting furnace; a supply means for supplying the iron source, which has been preheated in the preheating furnace, to the melting furnace; the melting furnace comprising electrodes for melting the preheated iron source; and a fixed-type discharge means for discharging molten steel which has been melted in the melting furnace, wherein the preheating furnace is integrally connected to the melting furnace. | 12-03-2015 |
| 20120006156 | STEEL PRODUCTION FACILITY - A steel production facility and a method of uninterrupted, or at least cyclical, steelmaking in the facility. In the case of uninterrupted steelmaking at least the first three of the following steps and in case of cyclical steelmaking all five steps are performed: charge materials are molten uninterruptedly or cyclically in an electric arc furnace; the charge materials (e.g., shredded scrap-iron pieces shredded in a shredding-system for shredding discarded iron and/or steel junk), Direct Reduced Iron and/or Hot Briquette Iron are uninter ruptedly or continuously during a melting process cycle fed into the electric arc furnace; a part of liquid steel is uninterruptedly or cyclically discharged from the steel bath of the electric arc furnace; from the thermic energy included in the hot process-exhaust of the electric arc furnace, electric energy is, by means of power generation, generated uninterruptedly or at least during a melting process cycle; a shredding-system assigned to the electric arc furnace for shredding the scrap is powered by the electric energy generated from the process exhaust. | 01-12-2012 |
| 20100263484 | SMELTING FURNACE - A smelting furnace having a vessel ( | 10-21-2010 |
| 075100340 |
Rotating chamber | 4 |
| 20080202287 | Process and Equipment for the Treatment of Loads or Residues of Non-Ferrous Metals and Their Alloys - Process and equipment for the treatment of loads or residues of non-ferrous metals and their alloys including the steps of loading of scraps or dross to be processed; heating the load ( | 08-28-2008 |
| 20120125151 | INTEGRATED STEEL PLANT WITH PRODUCTION OF HOT OR COLD DRI - An integrated steelmaking plant design is disclosed for efficiently merging the continuous operation of a reduction reactor producing hot DRI with the batch operation of at least one DRI melting furnace. The direct reduction reactor is adapted for producing hot DRI for its consumption in a DRI melting furnace or for producing cold DRI when the continuous production of DRI will exceed the DRI consumption rate of the melting furnace or when it suffers long-term operational delays. The reduction reactor has a DRI cooling zone within the same reactor vessel which is selectively operable for cooling the DRI in the same reactor vessel when the hot DRI produced in said reactor will not be consumed by the DRI melting furnace and when the capacity of the hot DRI bin feeding the melting furnace is insufficient to accumulate the amount of hot DRI which will not be consumed. The need of a DRI cooling vessel with its associated gas compressor and gas cooling and cleaning system is dispensed with therefore decreasing the capital and operational costs of said steelmaking plant. The invention also allows for a flexible and modular construction and operation of a steelmaking plant and is applicable to reduction reactors whether designed to operate at high or low pressure. | 05-24-2012 |
| 20160123664 | METHOD OF OPERATING ELECTRIC ARC FURNACE - The present invention relates to a method of operating an electric arc furnace containing (a) a furnace shell having a tapping hole and/or a slag door, (b) a furnace roof having a plurality of electrodes provided so as to face downwards, and (c) a rotating apparatus that rotates the furnace shell around a vertical axis relative to the electrodes, the method contains a rotating step of rotating the furnace shell relative to the electrodes during melting of a metal material, and a holding step of stopping the rotation when any one of the plurality of electrodes reaches a holding position that is previously set close to the tapping hole or the slag door, and holding the furnace shell at the holding position. | 05-05-2016 |
| 20160123665 | METHOD OF OPERATING ELECTRIC ARC FURNACE - The present invention relates to a method of operating an electric arc furnace containing a furnace shell having a tapping hole, a plurality of electrodes, and a rotating apparatus that rotates the furnace shell around a vertical axis relative to the electrodes, the method contains a charging step of opening an opening-and-closing door of a scrap bucket containing a metal material and falling the metal material into the furnace shell in which the furnace shell is rotated by the rotating apparatus until a direction of a line connecting a center of the furnace shell to a center of the tapping hole intersects an extension direction of a seam at a closing side of the opening-and-closing door, the opening-and-closing door is opened in this positional relationship to charge the metal material. | 05-05-2016 |
| 075100270 |
Carbothermic reduction of Aluminum(Al) compound | 4 |
| 20080196545 | LOW CARBON ALUMINUM PRODUCTION METHOD USING SINGLE FURNACE CARBOTHERMIC REDUCTION OPERATED IN BATCH MODE - A batch process for producing low carbon aluminum using a single carbothermic reactor furnace is disclosed in which the slag making, metal making and carbon extraction is carried out in a single furnace, single compartment reactor. The Al | 08-21-2008 |
| 20090007723 | METHOD FOR USING FRACTURE RESISTANT ELECTRODES IN A CARBOTHERMIC REDUCTION FURNACE - Graphite electrodes for the production of aluminum by carbothermic reduction of alumina are either submerged in the molten bath in the low temperature compartment or they are horizontally arranged in the side walls of the high temperature compartment. The electrodes are manufactured by using a mixture of coke particles covering the complete particle size range between 25 μm to 3 mm and by using an intensive mixer to effectively wet all coke particles with pitch. The electrodes have a flexural strength of at least 20 N/mm | 01-08-2009 |
| 20090139371 | CARBOTHERMIC ALUMINUM PRODUCTION APPARATUS, SYSTEMS AND METHODS - Apparatus, systems and methods for carbothermically producing aluminum are disclosed. The systems may include a reactor and an electrical supply. The reactor may include a plurality of side-entering electrodes and a top-entering electrode. The electrical supply may be operable to supply multiphase current to the side-entering electrodes and/or the top-entering electrodes. The electrodes may be in communication with a molten bath of the reactor, and the multiphase current supplied thereto may be passed through the bath to heat the reactor. The amount of current supplied to various electrode sets may be adjusted to facilitate tailored heating of the molten bath. | 06-04-2009 |
| 20100162850 | CARBOTHERMIC ALUMINUM PRODUCTION APPARATUS, SYSTEMS AND METHODS - Apparatus, systems and methods for carbothermically producing aluminum are disclosed. The systems may include a reactor and an electrical supply. The reactor may include a plurality of side-entering electrodes and a top-entering electrode. The electrical supply may be operable to supply multiphase current to the side-entering electrodes and/or the top-entering electrodes. The electrodes may be in communication with a molten bath of the reactor, and the multiphase current supplied thereto may be passed through the bath to heat the reactor. The amount of current supplied to various electrode sets may be adjusted to facilitate tailored heating of the molten bath. | 07-01-2010 |
| 075100230 |
Consumable metal-containing electrode | 2 |
| 20130340569 | METHOD FOR THE MELTING OF NEAR-BETA TITANIUM ALLOY CONSISTING OF (4.0-6.0)% AL - (4.5-6.0)% MO - (4.5-6.0)% V - (2.0-3.6)% CR, (0.2-0.5)% FE - (0.1-2.0)% ZR - This invention relates to nonferrous metallurgy, namely to manufacture of near-beta titanium alloys containing titanium and such alloying elements as molybdenum, vanadium, chromium, zirconium, iron and aluminum. The provided alloy contains the following components, in weight percentages: molybdenum—25 to 27; vanadium—25 to 27; chromium—14 to 16; titanium—9 to 11; with balance aluminum and iron and zirconium in the form of commercially pure metals. The technical result of this invention is capability to produce a near-beta titanium alloy with high chemical homogeneity alloyed by refractory elements and having aluminum content <6 wt %, wherein the alloy is characterized by a combination of stable high strength and high impact strength. | 12-26-2013 |
| 20120042749 | ESR Melting of NiTi Alloys - In a method for forming high purity NiTi alloys conventionally formed NiTi alloy containing inclusions is melted with a slag forming material which will chemically react with the inclusions. The slag forming material preferably is or contains CaF | 02-23-2012 |
| 075100290 |
Distillation or volatilization of refined metal or compound thereof | 1 |
| 20130152734 | METHODS AND APPARATUSES FOR EFFICIENT METALS PRODUCTION, SEPARATION, AND RECYCLING BY SALT- AND ARGON-MEDIATED DISTILLATION WITH OXIDE ELECTROLYSIS, AND SENSOR DEVICE RELATED THERETO - In one aspect, the present invention is directed to methods and apparatuses for recovering target metals from scrap. In some embodiments, the methods comprise dissolving a portion of a mixed metal scrap into a molten salt to form a molten salt and metal mixture, the scrap including a target metal species and at least one contaminant metal species; bubbling a gas through the molten salt and metal mixture to form a gas and metal vapor mixture comprising target metal vapors; and condensing at least a portion of the target metal vapors. In some embodiments, the apparatuses comprise a housing; a divider at least partially disposed within the housing, the divider forming at least a first chamber, a second chamber, and a fluid conduit between the first and second chambers; a top wall cooperating with a lower housing wall and at least one of the plurality of side walls to enclose the second chamber; a plurality of gas inlets disposed in the second chamber; and a gas outlet in fluid communication with the second chamber. | 06-20-2013 |
| Entries |
| Document | Title | Date |
|---|
| 20090000425 | Graphite Electrode for Electrothermic Reduction Furnaces, Electrode Column, and Method of Producing Graphite Electrodes - A graphite electrode for an electrothermic reduction furnace is formed from anode grade coke and graphitized at a graphitization temperature below 2700° C. The resulting electrode is particularly suited for carbothermal reduction of alumina. It has an iron content of about 0.05% by weight, a specific electrical resistivity of above 5 μOhm·m, and a thermal conductivity of less than 150 W/m·K. The graphite electrode is manufactured by first mixing calcined anode coke with a coal-tar pitch binder, and a green electrode is formed from the mixture at a temperature close to the softening point of the pitch binder. The green electrode is then baked to carbonize the pitch binder to solid coke. The resultant carbonized electrode, after further optional processing is then graphitized at a temperature below 2700° C. for a time sufficient to cause the carbon atoms in the carbonized electrode to organize into the crystalline structure of graphite. | 01-01-2009 |
| 20110005350 | RECOVERY METHOD AND RECOVERY APPARATUS OF THALLIUM IN CEMENT PRODUCTION FACILITIES - A method for recovering thallium in a cement production facility according to the present invention includes: a collecting process of collecting dust from combustion gas at a passage of the combustion gas, which is downstream of a gas outlet of a suspension preheater or a gas outlet of a demineralizer of a cement kiln of the cement production facility; a water-cleaning process of producing slurry or a water solution by cleaning the collected dust using water; and a filtering process of separating the slurry or water solution into a solid and a liquid and recovering thallium, wherein thallium is recovered from the combustion gas exhausted from the cement production facility. | 01-13-2011 |
| 20110005351 | METHOD FOR TREATING SPHEROIDAL GRAPHITE IRON AND POURING DEVICE THEREOF - A method for treating spheroidal graphite iron includes the step: pouring molten spheroidal graphite iron into a pouring electrical furnace ( | 01-13-2011 |
| 20120167714 | Systems and Methods for Recycling Steelmaking Converter Sludge - Systems and methods for processing sludge from a fume scrubbing system that scrubs fumes from a steelmaking converter in a manner that separates/isolates a significant portion of the metallic iron particles in the sludge and prepares these particles for convenient handling. In an exemplary system, the system includes separating equipment that isolates metallic iron particles in the sludge and forming equipment that forms the isolated particles into briquettes that have relatively high mechanical resistance that allow the briquettes to maintain their integrity during handling and storage. The high-metallic-iron-content briquettes can be recycled in the steelmaking process, for example, as charging material for a basic oxygen converter or an electric arc furnace. Water used in the system can be recycled and reused within the system, thereby making the system environmentally friendly. | 07-05-2012 |
| 20130019714 | METHOD FOR FOAMED SLAG GENERATION OF A NON-CORROSIVE MELT IN A CONVERTER - In order to carry out foaming of a slag having a high ratio of chromium oxide having values of often above 20% of a non-corrosive melt in an AOD (Argon Oxygen Decarburization) or MRP (Metallurgical Refining Process) converter or CONARC SSt for stainless steel by adding a foam material, according to the invention a previously defined mixture ( | 01-24-2013 |
| 20150075326 | HIGH-CARBON BIOGENIC REAGENTS AND USES THEREOF - This invention provides processes and systems for converting biomass into high-carbon biogenic reagents that are suitable for a variety of commercial applications. Some embodiments employ pyrolysis in the presence of an inert gas to generate hot pyrolyzed solids, condensable vapors, and non-condensable gases, followed by separation of vapors and gases, and cooling of the hot pyrolyzed solids in the presence of the inert gas. Additives may be introduced during processing or combined with the reagent, or both. The biogenic reagent may include at least 70 wt %, 80 wt %, 90 wt %, 95 wt %, or more total carbon on a dry basis. The biogenic reagent may have an energy content of at least 12,000 Btu/lb, 13,000 Btu/lb, 14,000 Btu/lb, or 14,500 Btu/lb on a dry basis. The biogenic reagent may be formed into fine powders, or structural objects. The structural objects may have a structure and/or strength that derive from the feedstock, heat rate, and additives. | 03-19-2015 |
