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| Number | Title | Issue Date |
| 8034283 | Rotary hearth furnace and method of operating the same A rotary hearth furnace includes an exhaust gas eductor. The exhaust gas eductor includes a compartment-defining portion and an exhaust duct. The compartment-defining portion is provided on part of a ceiling of the rotary hearth furnace in an exhaust gas discharge r... | 10/11/2011 |
| 7229281 | Method of mixing high temperature gases in mineral processing kilns A method is described for reducing NOx emissions and improving energy efficiency during mineral processing in a rotary kiln. The method comprises injection of air with high velocity/high kinetic energy into the kiln to reduce or eliminate stratification o... | 06/12/2007 |
| 7214254 | Method of removing mercury from mercury contaminated materials A method of reducing mercury levels in a mercury contaminated material using microwave energy. The method comprises the steps of (a) placing the mercury contaminated material in a microwave reactor; (b) providing a stream of gas in the microwave reactor, the stream ... | 05/08/2007 |
| 7032850 | Used-can processing system and method A used-can processing system includes a shredder for cutting a used drum can, and a pelletizer for pelletizing cut pieces of the used can. The shredder includes a pair of rotary blade units which rotate with their blades meshing each other so as to cut a used drum c... | 04/25/2006 |
| 6993855 | Method for drying compact containing metal oxide, method for reducing metal oxide, and rotary-hearth-type metal reducing furnace The present invention provides: a method for drying compacts containing water so as not to cause explosion and powdering; a method for reducing the compacts after being dried with great efficiency in a rotary-hearth-type reducing furnace; and a rotary-hearth-type me... | 02/07/2006 |
| 6630099 | Continuous metal melting apparatus A rotary furnace apparatus is provided for rapid melting of a variety of virgin and recycled ferrous and non-ferrous metals, which distributes the introduction of the unmelted charge materials and hence the melting heat requirements along an elongate gas-... | 10/07/2003 |
| 6551548 | Apparatus for producing reduced iron and compact drying An apparatus for producing reduced iron, and a compact drying method for application to the apparatus are disclosed. The apparatus comprises a pelletizer or a briquetter for mixing and agglomerating coal as a reducing agent and iron ore as iron oxide to f... | 04/22/2003 |
| 6451086 | Process for thermal treatment of residual materials containing heavy metal and iron oxide A process for thermal treatment of residual materials containing heavy metal and iron oxide, including providing a multiple-hearth furnace having hearths provided one above the other, depositing the residual materials continuously on a top hearth of the h... | 09/17/2002 |
| 6126716 | Iron-base scrap preheating apparatus and method In order to preheat pieces of iron scrap of various sizes and shapes highly effectively while avoiding the fusion of the pieces of iron scrap, a rotary kiln type preheating furnace and a shaft type preheating furnace are arranged in parallel with each oth... | 10/03/2000 |
| 6117387 | Apparatus for production of direct reduced iron with reduced fuel consumption and emission of carbon monoxide A system for producing direct reduced iron wherein iron oxide material and carbonaceous material is passed successively through an oxidizing zone and a reducing zone of a furnace, each zone fired by oxy-fuel combustion, enabling a reduction in the amount ... | 09/12/2000 |
| 6015527 | Facility for producing reduced iron In the method of producing reduced iron according to the invention, fine iron oxides and powdery solid reductants are mixed, compacted into sheet-like compacts, and charged onto the hearth of a reduction furnace for reduction while maintaining the tempera... | 01/18/2000 |
| 5989486 | Apparatus for removal of the mercury from granulated materials An apparatus for retorting granulated material containing mercury such as ores and precipitates wherein the granulated material is stirred by means of a plurality of paddles while under vacuum and at high temperature within a drum of the apparatus. The va... | 11/23/1999 |
| 5951740 | Production of direct reduced iron with reduced fuel consumption and emission of carbon monoxide A system for producing direct reduced iron wherein iron oxide material and carbonaceous material is passed successively through an oxidizing zone and a reducing zone of a furnace, each zone fired by oxy-fuel combustion, enabling a reduction in the amount ... | 09/14/1999 |
| 5885521 | Apparatus for rapid reduction of iron oxide in a rotary hearth furnace A method and apparatus for producing direct reduced iron from dry compacts composed of iron oxide and carbonaceous material by feeding compacts no more than two layers deep onto a hearth and removing all the volatiles and metallizing the compacts by expos... | 03/23/1999 |
| 5853657 | Reduced dusting bath system for metallurgical treatment of sulfide materials A pyrometallurgical vessel suitable for continuous or semicontinuous smelting and/or conversion of molten base metal sulfide feed materials. The top blown, bottom stirred vessel includes oxidizing gas lances and feed pipes directing their respective conte... | 12/29/1998 |
| 5843204 | Method for recycling iron and steel industry waste In a method of recycling iron and steel industry waste by processing the waste as an object substance by the use of a rotary kiln, the object substance is changed into a valuable material while the object substance travels within the rotary kiln from an u... | 12/01/1998 |
| 5783142 | Kiln system for treatment of reactive fines A kiln system for a process for treatment of aluminum dross residue (NMP) having available aluminum nitride (AlN) and/or free aluminum (Al) and/or aluminum chlorides (AlCl3) having a particle size within the range of 0.3 to 300 microns, i.e., "... | 07/21/1998 |
| 5700425 | Device for the pretreatment of electronic scrap A device for the pretreatment of electronic scrap, comprising a scroll cylinder (1) with a worm screw (2) inside it, endowed with inputs and outputs for thermal exchange fluid (13, 8) and electronic scrap to be treated (6, 14); a furnace comprising sucha ... | 12/23/1997 |
| 5616296 | Waste management facility An industrial waste management facility (IWMF) for disposing of spent potlining includes a co-current gas-fired rotary kiln for containing a molten pool of spent potlining throughout the entire length of the rotary kiln from the inlet to the outlet, an as... | 04/01/1997 |
| 5547490 | Method and installation for removing lead and zinc from foundry dust The foundry dust is fed to a first furnace atmosphere which is preferably at 1000° to 1100° C. With the dust pellet being continuously rolled around, it remains therein until in particular chlorine, alkali and lead compounds have almost completely evapo... | 08/20/1996 |
| 5451033 | Heat processing apparatus Apparatus for the continuous heat processing of scrap materials, particularly for decontaminating aluminum can scrap, has a rotary kiln defining a furnace chamber along which the material is fed and a hot gas circulation system including a duct leading th... | 09/19/1995 |
| 5402990 | Steel making plant This invention provides a method and appratus whereby steel of various compositions may be produced from iron ore and coal through a series of stages without the intermediate production of liquid iron. A reforming reactor receives top gases from the steel... | 04/04/1995 |
| 5324487 | Vacuum-suction degassing apparatus A melt is stored in a vessel. A lower half of a degassing member is immersed in the melt. The degassing member has a cylindrical form with the lower end closed, and the lower half section is made of a porous material which is permeable to gas and impermea... | 06/28/1994 |
| 5248473 | Apparatus for treatment and purification of waste gases from a secondary aluminum melting plant A process and apparatus for purifying waste gases from a secondary aluminum melting plant are provided, by which the individual waste gas flows are collected and thermally post-combusted, wherein the generation of the energy necessary for post-combustion ... | 09/28/1993 |
| 5186740 | Method for preheating scrap iron by pyrolysis of resinous residues contained therein, with total recovery of their energy content and improvement of the steelmaking cycle This method of preheating scrap iron mixed with plastic, rubber and resinous, ie organic, materials and intended for electric furnaces, in particular electric arc furnaces, is characterized by transforming the plastic, rubbery or resinous and like materia... | 02/16/1993 |
| 4767452 | Process for separating metals by distillation and condensation Process and equipment for separating molten metals with a distillation part (1) and a condenser part. The metal vessel (12) of the distillation part (1) is tiltable about at least one horizontal articulated axle (15) and is connected to a drive mechanism ... | 08/30/1988 |
| 4758268 | Method and apparatus for reclaiming metal values from electric arc furnace flue dust and sludge and rendering residual solids recyclable or non-hazardous A method for the pyrometallurgical treatment of environmentally hazardous steelmill flue dust and sludges to separate and recover the volatile heavy metals from the flue dust material and to convert the remaining iron into recyclable directly reduced iron... | 07/19/1988 |
| 4526350 | Waste gas collection device A push-pull exhaust scavenging system for removal of noxious fumes emanating from the mouth of metalurgical vessels known as converters. The converter, configured as a drum disposed for rotation about the elongate longitudinal axis includes a mouth openin... | 07/02/1985 |
| 4487399 | Converter for refining liquid metal A converter for refining liquid metals having a cylindrical horizontally disposed vessel (1) with a first opening (6) for charging and pouring and a second opening (13) circumferentially and longitudinally displaced from the first opening for exhaust gase... | 12/11/1984 |
| 4436286 | Process of afterburning combustible constituents of exhaust gases from rotary kilns In order to avoid incrustation and an excessively strong thermal attack on the afterburning chamber, the exhaust gases which contain gaseous and solid constituents which are combustible are afterburned in a plurality of stages, which are connected in seri... | 03/13/1984 |
| 4415360 | Method for working-up metal-containing waste products The invention relates to a method for converting metal-containing waste material having substantial quantities of organic constituents, such as plastics, rubber, paper and greases, to a product from which metal can readily be recovered. The waste material... | 11/15/1983 |
| 4284419 | Declogging process for filtration installation and improved filtration installation The invention relates to an apparatus and a declogging process for filtration installation for dust-laden gases presenting reducing properties, consisting in taking dust-free gas at the outlet of the filtration installation, oxidizing this gas and using t... | 08/18/1981 |
| 4273314 | Direct reduction rotary kiln with improved air injection In the direct reduction process for reducing iron ore to sponge iron of the type disclosed in U.S. Pat. No. 3,890,138 to Hockin wherein all of the air supply tubes along the rotary kiln inject air toward the discharge end of the kiln it has been found tha... | 06/16/1981 |
| 4147334 | Method and apparatus of producing iron In a method of producing iron by direct reduction of the ore, compaction into agglomerates and fusion, where the ore is reduced by a gaseous process with pre-reduction to monoxide FeO at 1000° C., followed by a final reduction at 700° C. The resultant p... | 04/03/1979 |
| 4040819 | Basic oxygen steel furnace and process An improved method for the production of steel which results in reducing the volume of off-flow gases which are created in the production of steel by the Basic Oxygen Steel Process. The method involves introduction of oxygen within the flame cone of the o... | 08/09/1977 |
| 4039173 | Aluminum dross recovery method Dross, principally oxides and nitrides of aluminum and entrained metallic aluminum, is transferred quickly from the melting furnace to a cooling drum and cooled in less than 3 minutes to below 400° F. without substantial removal of metallic aluminum befo... | 08/02/1977 |
| 4017061 | Conveyor tube for a particulate heating furnace A conveyor tube construction for transporting particulate material as it passes through a furnace, the heating elements being a plurality of parallel radiant heating rods parallel to the conveyor tube and surrounding the tube in spaced relation to the tub... | 04/12/1977 |
| 3963416 | Furnace exhaust system Apparatus is disclosed for attachment adjacent an open end of a rotary furnace, having a first effluent furnace gas exhaust duct projecting into the furnace and a dust collecting hood adjacent the furnace opening. A pressurized air duct plenum having a pl... | 06/15/1976 |
| 3963465 | Gas line loop water seal A gas line loop water seal has a water supply line connected to the entrance end of a vertical gas pipe loop, a vertical water discharge line with a drain seal at the exit end of the loop and a water drain line with a shut off valve connected from the bot... | 06/15/1976 |
