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| Number | Title | Issue Date |
| 7323032 | Pyrochemical reprocessing method for spent nuclear fuel This invention is provided for improvement of corrosion-resistant property of a crucible and for promotion of safety in a pyrochemical reprocessing method for the spent nuclear fuel. The spent nuclear fuel is dissolved in a molten salt placed in the crucible. In a p... | 01/29/2008 |
| 7267698 | Method for producing hydrogen The invention is a method for producing hydrogen using a generator, heating the vessel that is part of the generator, loading waste comprising steel into the heated vessel, melting the loaded waste to a molten state using a non-transferred torch to cut and melt the ... | 09/11/2007 |
| 7137436 | Method and apparatus for melting titanium using a combination of plasma torches and direct arc electrodes A method and apparatus for optimizing melting of titanium for processing into ingots or end products. The apparatus provides a main hearth, a plurality of optional refining hearths, and a plurality of casting molds or direct molds whereby direct arc electrodes melt ... | 11/21/2006 |
| 6980580 | Electrode arrangement as substitute bottom for an electrothermic slag smelting furnace The electrode arrangement uses vertically oriented electrodes with side wall contacts for an electrothermic smelting furnace for aluminum production. The side wall contacts are radially moveable into the furnace to compensate for wear on the contacts. The side wall ... | 12/27/2005 |
| 6971323 | Method and apparatus for treating waste An apparatus for treating waste includes a vessel and AC plasma torches with a variable flame mounted with the vessel. The flames generated by the torches can be adjusted depending on the characteristics of the waste being treated. Waste can be introduced into the v... | 12/06/2005 |
| 6935855 | Apparatus for extrusion of water-containing products The inventions relates to an extrusion apparatus suited for water-containing products which heat-expand by internal boiling of water by pressure relief after passing through extrusion nozzles. The apparatus comprises a) an extruder, which at the outlet end thereof c... | 08/30/2005 |
| 6193503 | Ash melting furnace and ash melting method thereof The object of this invention is to provide an ash-melting furnace which can respond to fluctuations in the load and which will be capable of highly efficient and stable operation. In an ash-melting furnace which heats and melts the primary ash and the fly... | 02/27/2001 |
| 6160238 | Tunable molten oxide pool assisted plasma-melter vitrification systems The present invention provides tunable waste conversion systems and apparatus which have the advantage of highly robust operation and which provide complete or substantially complete conversion of a wide range of waste streams into useful gas and a stable... | 12/12/2000 |
| 6127645 | Tunable, self-powered arc plasma-melter electro conversion system for waste treatment and resource recovery The present invention provides a relatively compact self-powered, tunable waste conversion system and apparatus which has the advantage of highly robust operation which provides complete or substantially complete conversion of a wide range of waste stream... | 10/03/2000 |
| 6125133 | Lance/burner for molten metal furnace A method for providing main gas into a pool of molten metal, which is particularly useful for use in an electric arc furnace. The method employs combustion of secondary oxygen with fuel to form a flame envelope around a main gas stream which protects the ... | 09/26/2000 |
| 6086361 | Melt treatment apparatus A melt treatment apparatus is provided which obviates an increase in floorspace and in cost and has freedom from a danger of steam explosion and further can control melt discharging with reliability. The welt treatment apparatus 1 is constructed with a furnace... | 07/11/2000 |
| 6015963 | Plasma arc furnace with improved replaceable electrodes A plasma arc waste treatment furnace is equipped with a plasma arc torch having an electrode formed from a conductive refractory material. The refractory electrode can be operated at very high temperatures and does not need to be water-cooled. This elimin... | 01/18/2000 |
| 5963579 | Method of heating a molten metal in a continuous casting tundish using a plasma torch, and tundish for its implementation Method of heating molten metal in a tundish by irradiating a plasma torch on molten metal flowing along an internal surface of a heating compartment, and tundish configured for such method.... | 10/05/1999 |
| 5961689 | Method of protective atmosphere heating A method for heating and/or melting a charge such as aluminum in a furnace using heat generated by combustion to radiatively heat the charge through a layer of protective gas wherein combustion reaction products generated by the combustion are exhausted f... | 10/05/1999 |
| 5958264 | Plasma gasification and vitrification of ashes This invention discloses a method and an apparatus for gasification and vitrification of ashes, such as produced in a hog-fuel fired boiler, by means of a plasma arc. The ashes are introduced into a shaft furnace where two or three tiltable electrodes are... | 09/28/1999 |
| 5802097 | Melting method for an electric ARC furnace with alternative sources of energy and relative electric ARC furnace with special burner positioning Melting method for an electric arc furnace with alternative sources of energy for the melting of iron-based alloys, the electric furnace (10) including tuyeres (13) positioned on the bottom to deliver oxygen, at least one tuyere (15) to deliver coal dust ... | 09/01/1998 |
| 5798496 | Plasma-based waste disposal system Method and apparatus for the disposal of waste including a rotary kiln comprising at least one, and preferably a plurality of plasma guns positioned within a chamber defined by the rotary kiln, and at least one target electrode which is rotatable. One pre... | 08/25/1998 |
| 5798497 | Tunable, self-powered integrated arc plasma-melter vitrification system for waste treatment and resource recovery The present invention provides a relatively compact self-powered, tunable waste conversion system and apparatus which has the advantage of highly robust operation which provides complete or substantially complete conversion of a wide range of waste stream... | 08/25/1998 |
| 5785923 | Apparatus for continuous feed material melting The apparatus of the present invention is a melter housing having a pretreat chamber heated with a feed material heater that is partially isolated from a melter chamber. The method of the present invention has the steps of introducing feed material into a... | 07/28/1998 |
| 5734673 | Waste-melting furnace and waste-melting method A waste-melting furnace includes a furnace body, a rotary heat-resistive vessel which is arranged inside the furnace body and into which waste is to be fed, and a transferred arc type torch plasma gun and a water-cooled electrode arranged above the rotary... | 03/31/1998 |
| 5563903 | Aluminum melting with reduced dross formation An aluminum melting method wherein an atmosphere above the aluminum charge is comprised of two strata, a lower strata covering the aluminum charge comprised of a non-oxidizing gas and an upper strata comprised of combustion gases from one or more burners.... | 10/08/1996 |
| 5528012 | Apparatus and method for starting a plasma arc treatment system An ignitable material is positioned in contact with a slag contained within a plasma arc treatment system having an electrode and an electrical ground. The slag is initially at a temperature below a conducting temperature at which the slag will conduct el... | 06/18/1996 |
| 5454852 | Converter for the production of steel A converter for the production of steel from solid and/or liquid charging substances, such as pig iron and/or scrap and/or sponge iron, includes a refractorily lined refining vessel, a refining device for feeding oxygen or an oxygen-containing gas, and a ... | 10/03/1995 |
| 5406047 | Plasma torch for melting material to be processed in a container and for maintaining the material at the required temperature The invention is directed to a plasma torch which projects into a container and is fastened at a supporting device and has a nozzle arranged at a burner lance, as well as a main electrode pipe with a main electrode arranged inside the burner lance, gaseou... | 04/11/1995 |
| 5368627 | Treatment of oxide-containing dusts An arc is drawn between a movable electrode (E) (preferably graphite), and a fixed electrode (7) in a furnace when smelting metal oxides using a plasma. Shielding gas, e.g. N. is introduced into plenum (P) about the movable electrode (E) to prevent metal ... | 11/29/1994 |
| 5329545 | Tuyere for installation in hearth of electric arc furnace Molten metal in an electric arc furnace is stirred by introducing a gas into the melt through tuyeres mounted in the hearth. Each tuyere has an inlet portion having a passage of relatively large diameter and an outlet portion having a passage of relativel... | 07/12/1994 |
| 5288969 | Electrodeless plasma torch apparatus and methods for the dissociation of hazardous waste A system and method are provided for the non-thermal destruction of hazardous waste material using an electrodeless inductively coupled RF plasma torch. The waste material is combined with a controllable source of free electrons, and the RF plasma torch i... | 02/22/1994 |
| 5272718 | Method and apparatus for forming a stream of molten material A method and apparatus for forming a stream of molten material. The apparatus includes a melt container having a bottom wall in which is formed an aperture. A funnel is adapted and constructed to receive molten material from the aperture in the container,... | 12/21/1993 |
| 5206879 | Destruction process Chemical waste is burned in oxygen using an electric plasma flame to heat a stream of gas which contains at least 70% by weight oxygen. Liquid waste in fine droplet form is introduced into the gas stream via a two-fluid atomizer using a carrier gas also p... | 04/27/1993 |
| 5177763 | Furnace bottom structure of direct current electric furnace A furnace bottom structure of a direct current electric furnace has at least one furnace bottom electrode and at least one gas injection tuyere provided in the furnace bottom refractory of the direct current electric furnace. Preferably, the furnace botto... | 01/05/1993 |
| 5157685 | Method and apparatus for preparing a melt for mineral fibre production A method of preparing a melt for mineral fibre production wherein a mixture of mineral fibre-forming raw materials is introduced into a shaft furnace and is heated to melting temperature by a plasma gas stream formed in a plasma torch and wherein waste ma... | 10/20/1992 |
| 5136609 | Method of producing finely divided particles or powder, vapor or fine droplets, and apparatus therefor A method of producing finely divided particles or powder, vapor or fine droplets comprises the steps of heating and melting the starting raw material in a vessel having opposed reflecting surfaces, and ejecting the melted raw material from the vessel as h... | 08/04/1992 |
| 5131941 | Reaction apparatus and method A high temperature reaction apparatus and method employing radiation to heat and react on matter, such as one or more fluids containing one or more reaction materials in gaseous molecular and/or particulate form. In a preferred form, one or more high temp... | 07/21/1992 |
| 5107517 | Melting furnace A furnace for producing a melt for mineral wool production includes a shaft for preheating and melting of the raw material. A water-cooled grate is disposed in the bottom portion of the shaft, which supports a bed of ceramic filling bodies as well as the ... | 04/21/1992 |
| 5104432 | Process for fiberizing molten glass or refractory oxide materials A process for the treatment of a continuous or perturbated stream of liquid material, which process consists essentially of passing the said stream of liquid material through a plasma arc coupling zone in which at least two plasma arcs are coupled at the ... | 04/14/1992 |
| 5090340 | Plasma disintegration for waste material Apparatus and method for the disintegration of waste by subjecting the waste within a closed chamber to plumes of an electrically generated high temperature plasma. The chamber is lined with an array of nozzles to produce the plumes and the nozzles are su... | 02/25/1992 |
| 5046144 | Method and furnace for the preparation of a melt for mineral wool production In a method for the preparation of a melt for the production of mineral wool a raw material is introduced at the top of a shaft furnace and heated to melting temperature partly with a hot gas formed by plasma heating and partly with a hot gas formed by co... | 09/03/1991 |
| 4997474 | Silicon smelting process A silicon smelting furnace and a process for utilizing this furnace for the production of silicon is described. The process involves a process in which equilmolar proportions of silicon carbide and silicon dioxide are charged to the reaction zone of a sil... | 03/05/1991 |
| 4996694 | Method and apparatus for melting iron and steel scrap A method for melting iron and steel scrap wherein scrap is fed through a shaft furnace countercurrent to a reducing gas. The reducing gas is formed by passing air through a plasma generator and injecting coal and/or hydrocarbon into the hot air so that th... | 02/26/1991 |
| 4985067 | Process and device for implementing hot chemical processes Method for melting or melt reducing chemical mixtures at temperatures which exceed the melting temperatures of highly-refractory linings. The method requires the steps of pressing the chemical mixture into bars and arranging the bars to form a cavern havi... | 01/15/1991 |
