Class / Patent application number | Description | Number of patent applications / Date published |
075100350 | Reducing or smelting slag or dross as starting material | 12 |
20080250899 | Processing Metallurgical Slag - The invention provides a method of processing a starting material in the form of a metal oxide-containing raw metallurgical slag to obtain a processed slag product. The method includes admixing the raw slag with a reductant to obtain a reaction mixture and heating the reaction mixture to cause the reductant to reduce the metal oxide in the slag, to obtain molten metal, in particular containing f erromanganese, and molten processed slag, in particular having a manganese content of at most 10% by mass. The method further includes separating the molten processed slag from the molten metal and causing or allowing the molten processed slag to solidify, thereby to obtain a solid processed slag product. This processed slag product may be, as desired, a filler for use in brick-making or for use in formulating a ready-mix concrete, an extender for extending a cement or for producing a blended cement, or an aggregate for use in the construction or building industry. | 10-16-2008 |
20080250900 | METHOD AND APPARATUS FOR LEAD SMELTING - A method for producing lead involves feeding lead concentrate, flux and solid fuel passing to a feed preparation unit. The prepared, mixed feed is then passed to a lead smelting furnace, such as an ISASMELT furnace or other top entry, submerged lance furnace. Air or oxygen, is injected into the molten charge in the ISASMELT furnace via the submerged lance. The feed mixture is converted into lead bullion and a lead-containing slag. The slag removed from the furnace is formed into lumps having a desirable size range. The slag lumps, together with coke and flux are fed into a blast furnace. In the blast furnace, the slag is converted into lead bullion and discard slag. The lead bullion removed may be subsequently fed to a lead refinery for further treatment. | 10-16-2008 |
20090211398 | Process and Arrangement for Extracting a Metal from Slag a Containing Said Metal - The invention is directed to a process for extracting a metal from a slag containing said metal, wherein the liquefied metal-containing slag is heated in at least one electric arc furnace ( | 08-27-2009 |
20090249919 | METHOD FOR THE CONTINUOUS OR DISCONTINUOUS EXTRACTION OF A METAL OR SEVERAL METALS FROM A SLAG THAT CONTAINS THE METAL OR A COMPOUND OF THE METAL - The invention concerns a method for the continuous or discontinuous extraction of a metal or several metals from a slag that contains the metal or a compound of the metal, in which the liquefied metal-containing slag is heated in a primary or secondary smelting unit ( | 10-08-2009 |
20100089202 | METHOD FOR THE REDUCTION OF A SLAG HAVING A HIGH DEGREE OF CHROMIUM IN AN ELECTRIC ARC FURNACE - During the production of stainless steel, a slag is formed during the melting of the solid material in the electric arc furnace, the slag having a high degree of metal oxides, particularly chromium oxide. The chromium concentration often reaches values of more than 30%. Currently, such slags cannot be reduced to a desired degree due to their composition. In order to minimize the resulting high loss of recyclable material, the invention provides to charge the electric arc furnace with pellets, or briquettes ( | 04-15-2010 |
20110203413 | PROCESS AND EQUIPMENT FOR THE TREATMENT OF LOADS OR RESIDUES OF NON-FERROUS METALS AND THEIR ALLOYS - A process for the treatment of loads or residues of non-ferrous metals and their alloys includes the steps of loading of scraps or dross to be processed and heating the load and melting the metal. The process additionally includes revolving the heated load, tapping the molten metal and emptying a cavity of the furnace. Heating of the load or residues to a temperature above the melting temperature of the metal or non-ferrous alloy to be recovered is carried out by means of a free burning convective arc which is independent from the supply of external gas to the process, and which may dispense with the use of melting salts. | 08-25-2011 |
20130186236 | Energy Efficient Salt-Free Recovery Of Metal From Dross - A process and an apparatus are disclosed for improved recovery of metal from hot and cold dross, wherein a dross-treating furnace is provided with a filling material with capacity to store heat. This filling material is preheated to a desired temperature by injection of an oxidizing gas to burn non-recoverable metal remaining in the filling material after tapping of the recoverable metal contained in the dross and discharging of the treatment residue. When dross is treated in such furnace, the heat emanating by conduction from the filling material is sufficient to melt and separate the recoverable metal contained in the dross, without addition of an external heat source, such as fuel or gas burners, plasma torches or electric arcs and without use of any salt fluxes. Furthermore, the recovered metal being in the molten state can be fed to the molten metal holding furnace without cooling the melt. | 07-25-2013 |
20130269481 | METHOD FOR PRODUCING BLISTER COPPER DIRECTLY FROM COPPER CONCENTRATE - The present invention provides a method for producing blister copper directly from copper concentrate, comprising: a) adding copper concentrate, copper matte, slagging material, oxygen enriched air, endothermic material to a upper segment of the reaction furnace; b) adding reducing agent to the lower segment space of the reaction furnace; c) directing the produced hot coke and liquid slag into an electric furnace, and adding copper concentrate into the electric furnace to generate an electric furnace slag and copper matte; d) the copper matte being granulated and finely ground, then re-fed into the reaction furnace. The addition of reducing agent in the lower segment will not increase the heat load of the reaction furnace since the reducing agent does not burn. Over-oxidized Cu | 10-17-2013 |
20150122082 | METHOD FOR PROCESSING SLAGS OF NON-FERROUS METALLURGY - The invention relates to a method for processing slags of non-ferrous metallurgy, containing iron and valuable metals, to produce clean slag that is free of detrimental substances and valuable metals and suitable as it is for use as a raw material or construction material. Slag is reduced in a reduction furnace ( | 05-07-2015 |
20150135896 | METHOD OF REDUCTION PROCESSING OF STEEL-MAKING SLAG - The method of reduction processing of steel-making slag, includes: a hot steel-making slag inflow process of continuously or intermittently charging, from a slag supplying container, hot steel-making slag to a molten slag layer on a molten iron contained in an electric furnace while adjusting an amount of inflow with the slag supplying container; a reducing agent supplying process of supplying a reducing agent to the molten slag layer; an electrifying and heating process of heating the molten iron and the molten slag layer through application of electric power; and a reduction process of continuing reduction processing of the hot steel-making slag in a non-oxidizing atmosphere while intermittently discharging either one or both of the molten iron or molten slag of the molten slag layer. | 05-21-2015 |
20190144970 | METHOD FOR REFINING SULFIDIC COPPER CONCENTRATE | 05-16-2019 |
20220134346 | WELDING SLAG CLEANING DEVICE, WELDING MACHINE HEAD AND WELDING SYSTEM - Disclosed are a welding slag clearing device, a welding machine head and a welding system. The welding slag clearing device includes: a mounting frame; a slag crushing mechanism comprising a slag crushing wheel and an adjusting assembly, the slag crushing wheel is connected to the adjusting assembly, the adjusting assembly is connected to the mounting frame, and the adjusting assembly is configured to adjust a longitudinal distance of the slag crushing wheel relative to the mounting frame; and a welding slag recovery mechanism comprising a hollow recovery pipe and a connecting piece used for connecting the recovery pipe with the mounting frame, the recovery pipe is correspondingly arranged right behind the slag crushing mechanism in a transverse direction. | 05-05-2022 |