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| Number | Title | Issue Date |
| 7819941 | Method for reducing and/or refining a metal-containing slag The invention relates to a method for reducing and/or refining a metal-containing slag. The aim of the invention is to improve reduction of the slag. For this purpose, calcium carbide (CaC2) is added to the slag as the reducing agent. ... | 10/26/2010 |
| 7776132 | Molten metal treatment, method for treating molten metal, and apparatus and method for feeding cover gas to molten metal A molten metal treatment consisting of a liquid mixture in which fluorinated ketone is dissolved in liquid carbon dioxide at 0.01 to 10 wt % is put in a container, and the molten metal treatment is vaporized, and is fed as a cover gas to be contacted with the surfac... | 08/17/2010 |
| 7776133 | Method of operating non-ferrous smelting plant In the operation, a flux mainly composed of silica ore and a non-ferrous metal-ore raw-material are charged into a smelting furnace via a conveying system. In order to increase the production amount of the metal, the flux is conveyed and treated through a first syst... | 08/17/2010 |
| 7226493 | Method for grain refining of steel, grain refining alloy for steel and method for producing grain refining alloy The present invention relates to a method for grain refining of steel. A grain refining alloy having a composition FeXY where X is one or more elements selected from the group consisting of Cr, Mn, Si, Ni, and Mo and where Y is one or more oxide and/or sulphide and ... | 06/05/2007 |
| 7147823 | High temperature cooling system and method A method for cooling a heat source, a method for preventing chemical interaction between a vessel and a cooling composition therein, and a cooling system. The method for cooling employs a containment vessel with an oxidizable interior wall. The interior wall is oxid... | 12/12/2006 |
| 6929674 | Cover gases A cover gas composition for protecting molten magnesium/magnesium alloy includes a fluorine containing inhibiting agent and a carrier gas. Each component of the composition has a Global Warming Potential (GWP) (referenced to the absolute GWP for carbon dioxide at a ... | 08/16/2005 |
| 6923843 | Method for oxygen injection in metallurgical process requiring variable oxygen feed rate A method of processing molten metal by the injection of oxygen through a water cooled supersonic oxygen injection lance. In the first step of the process, oxygen is injected through the injection lance at an initial flowrate to the process which is the optimal flowr... | 08/02/2005 |
| 6921474 | Chloride melt process for the separation and recovery of zinc Process for the production of ZnCl2 from a Zn bearing primary and/or secondary material comprising the steps of reacting the Zn bearing material with a chlorinating agent such as Cl2 to convert metals into chlorides and vaporising the volatile ... | 07/26/2005 |
| 6887298 | Method and equipment for smelting non-ferrous metal sulphides in a suspension smelting furnace in order to produce matte of a high non-ferrous metal content and disposable slag The present invention relates to a method and equipment, whereby matte with a high non-ferrous metal content and disposable slag are produced simultaneously in a suspension-smelting furnace from non-ferrous sulphide concentrate. According to the invention, a carbona... | 05/03/2005 |
| 6814779 | Process for producing high-purity metals A process for metal purification comprising a first step for heating a feed metal in a feed crucible to generate a vapor of the metal, a second step for directing the vapor into a condensation passageway for vapors, where part of the vapor is condensed to generate a... | 11/09/2004 |
| 6755890 | Method for reducing non-ferrous metal content in slag in the production of non-ferrous metals occurring in suspension smelting furnace The present invention relates to a method, whereby the non-ferrous metal content of the slag generated in the production of non-ferrous metals such as copper or nickel in a suspension smelting furnace is reduced by charging metallurgical coke, with a size ranging fr... | 06/29/2004 |
| 6685764 | Processing molten reactive metals and alloys using fluorocarbons as cover gas This invention relates to a method for preventing the ignition of molten magnesium by contacting the molten magnesium with a gaseous mixture comprising a fluorocarbon selected from the group consisting of perfluoroketones, hydrofluoroketones, and mixtures... | 02/03/2004 |
| 6682585 | Refining nonferrous metals and alloys with gases having reduced global warming potential An improved method of processing both primary and secondary nonferrous metal and alloys of said metals using a refining gas is provided. The improvement involves refining said non-ferrous metal and alloys with a gaseous mixture including at least one comp... | 01/27/2004 |
| 6576040 | Process and plant with oxygen-enriched air feed for a non-ferrous metal production unit All of the air is compressed in a single compressor, which feeds a smelter for smelting ore, a converter for converting matte coming from the smelter and an air separation unit which delivers two oxygen streams for enriching the air. A buffer tank is used... | 06/10/2003 |
| 6572675 | Method of operation of tilting rotary furnace system for recovery of non-ferrous metals from scrap or dross A furnace system for recovering a non-ferrous metal from a charge of material containing the metal. The furnace system having a furnace chamber having walls defining a refractory chamber, the refractory chamber receiving the charge of material and the met... | 06/03/2003 |
| 6537346 | Molten magnesium cover gas using fluorocarbons This invention relates to a method for preventing the ignition of molten magnesium by contacting the molten magnesium with a gaseous mixture comprising a fluorocarbon selected from the group consisting of perfluoroketones, hydrofluoroketones, and mixtures... | 03/25/2003 |
| 6521018 | Blanketing metals and alloys at elevated temperatures with gases having reduced global warming potential An improved method of processing a nonferrous metal and alloys of said metal using a blanketing gas having a global warming potential is provided. The improvement involves reducing the global warming potential of the blanketing gas by blanketing the nonfe... | 02/18/2003 |
| 6398844 | Blanketing molten nonferrous metals and alloys with gases having reduced global warming potential An improved method of processing a molten non-ferrous metal and alloys of the metal using a blanketing gas having a global warming potential is provided. The improvement involves reducing the global warming potential of the blanketing gas by blanketing th... | 06/04/2002 |
| 6387154 | Process for separating molten metals A process for separating molten metals, the molten metals being treated with metal hydrides is provided. The molten metals employed are from Groups II-IV of the Periodic Table of Elements and the subgroups, including their alloys, and are distinguished by... | 05/14/2002 |
| 6261340 | Method for transforming slag derived from non-iron metallurgy In a method of converting slags derived from nonferrous metallurgy, in particular primary and secondary Ni and Cu metallurgical slags, while recovering and/or enriching the nonferrous metals and forming synthetic puzzolans, the molten oxidic slags are red... | 07/17/2001 |
| 6096110 | Method for cleaning slag in an electric furnace The invention relates to a method for cleaning slag, created in metallurgical processes of non-ferrous metals, in an electric furnace, and particularly the method is related to a semi-continuous cleaning process. According to the novel method, the electri... | 08/01/2000 |
| 6093235 | Process for decarbonising a high-chromium steel melt A process for decarburizing a steel melt for the production of high-chromium steels by blowing in oxygen in which the decarburization rate is continuously measured and the amount of oxygen to be injected is adjusted depending on the measured values. The f... | 07/25/2000 |
| 6010553 | Process for producing pig iron, nonferrous heavy metal alloys, FECR and synthetic blast furnace slags using metal-oxide-containing waste incineration residues or slags In a process for producing pig iron, nonferrous heavy metal alloys, ferrochromium carbure or carbon-free ferrochromium and synthetic blast furnace slags, using metal-oxide-containing waste incineration residues or slags, the charging materials of waste bu... | 01/04/2000 |
| 5882377 | Process for smelting reduction of chromium ore In this invention, the smelting reduction operation can be carried out in a high efficiency by charging a carbonaceous material in such an amount that total surface area is not less than 60 m2 per 1 ton of slag weight. Carbon substance finely p... | 03/16/1999 |
| 5855645 | Production of more concentrated iron product from industrial waste materials streams A method for producing a more concentrated iron product from an industrial waste materials stream comprising iron and non-iron constituents such as EAF and basic oxygen furnace dust generally comprising the steps of compacting or briquetting the waste mat... | 01/05/1999 |
| 5849061 | Process for refining high-impurity copper to anode copper A process for refining high-impurity blister copper to anode quality copper is disclosed. In an oxidation step of a blister copper refining stage, soda ash fluxing removes antimony and arsenic while also removing sulfur and iron. In a deoxidation step of ... | 12/15/1998 |
| 5776226 | Method for working up refuse or metal-oxide-containing refuse incineration residues A method for working up refuse or metal-oxide-containing refuse incineration residues or metallurgical residues includes an at least partial oxidation in a meltdown oxidizing reactor followed by a two-stage reduction. The first reduction stage is effected... | 07/07/1998 |
| 5669957 | Dross compression apparatus and method utilizing ribs on collector and head A dross compression apparatus and method utilizes a dross compression head and a skim box or collector having mating ribs. The ribs may be any type of projection or shape of the head and skim box sufficient to form grooves in both sides of the dross which... | 09/23/1997 |
| 5591248 | Method for melting metal, especially non-ferrous metal The invention relates to a method and a device for melting or processing metal. The metal material is batched into a chamber (1) and circulated from one chamber to another (3, 5, 10, 11, 15, 18) with simultaneous melting under the effect of thermal radiat... | 01/07/1997 |
| 5540752 | Method for recovery of non-ferrous metals from scrap and dross A process and apparatus are disclosed for recovering a non-ferrous metal, preferably aluminum and aluminum alloys, in molten coherent form from a charge of material to be processed containing the metal. The charge is introduced into a sealable furnace whi... | 07/30/1996 |
| 5527380 | Recovery of non-ferrous metals from dross A method for recovering non-ferrous metal from a dross that includes the non-ferrous metal includes introducing the dross into a rotary furnace or rotatable converter. The furnace or converter has a refractory lining. Oxygen and a fossil fuel are supplied... | 06/18/1996 |
| 5518524 | Method of reducing emissions from a metal melting furnace A vertical shaft furnace for melting non-ferrous metals, such as copper, aluminum, and their alloys, includes metal blocks disposed in an annular wall just beneath the charging section of the furnace. Preheated air is forced into the furnace shaft through... | 05/21/1996 |
| 5445847 | Method for preparing chalcopyrite-type compound A chalcopyrite-type compound, for instance, CuInS2 or CuGaS2, is prepared by subjecting a Group I-III oxide composition, containing at least one of the Group Ib element, for instance copper (Cu), and at least one of the Group IIIb el... | 08/29/1995 |
| 5423900 | Method for blowing oxidizing gases into molten metal The invention relates to a method for blowing oxidizing gases into molten metal located in a reaction vessel having tuyeres below the metal bath surface, whereby the oxidizing gases are blown into the molten metal from these tuyeres and fed to the tuyeres... | 06/13/1995 |
| 5300136 | Potassium fertilizer from aluminum reclamation by-products Scrap aluminum is reclaimed by a salt flux-based reclamation process using potassium chloride in place of the commonly used sodium chloride. The spent flux which remains after the recovery of the aluminum is useful as a soil fertilizer, with the potassium... | 04/05/1994 |
| 5281252 | Conversion of non-ferrous sulfides The invention relates to the smelting or converting of particulate sulfide material, such as nickel or copper sulfide. A molten seed bath of smelted or converted material is provided in a reaction vessel. Particulate sulfide material is injected into a re... | 01/25/1994 |
| 5246484 | Process for reducing nonferrous metal oxides in slags In the reduction of liquid slags or molten salts which contain nonferrous metal oxides and are disposed over a liquid metal layer consisting of the corresponding nonferrous metal oxides and are disposed over a liquid metal layer consisting of the correspo... | 09/21/1993 |
| 5104445 | Process for recovering metals from refractory ores The present invention is a process to recover metals from refractory ores. It involves the chlorination of an ore concentrate in the presence of solid salt at a temperature between 300° and 650° C. Thereafter, an oxidation step can be used to convert ir... | 04/14/1992 |
| 5076838 | Process for direct reduction of materials in a kiln An apparatus for directly reducing pellets of material without melting the material includes the transporting of the pellets through drying and preheating zones on an oxidizing traveling grate and reduction in a ported rotary kiln. There is a kiln having ... | 12/31/1991 |
| 4828814 | Process for purification of solid material A process is disclosed for producing a solid material which, in some cases, may have a resultant purity of 99.999% or better which comprises contacting the solid material at a temperature approaching the melting point of the solid material with a purifyin... | 05/09/1989 |
