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| Number | Title | Issue Date |
| 7691178 | Production of iron A process for producing desulphurised iron in a solid form. The process includes (a) direct smelting an iron-containing metalliferous feed material and producing molten iron; (b) desulphurising molten iron produced in the direct smelting (a); and (c) casting desulph... | 04/06/2010 |
| 7279127 | Continuous steelmaking plant The present invention provides a process plant for the production of molten steel from primary and/or secondary ferrous materials in which no free oxygen is permitted to contact directly carbon-containing iron melts, comprising:—i) at least three pairs of furnaces... | 10/09/2007 |
| 7238222 | Thermal synthesis production of steel A process for producing liquid steel is disclosed. Carbon monoxide and oxygen may be combusted in a high temperature reactor. Iron and iron oxide materials, along with scrap steel if desired, may be placed in the high temperature reactor. Carbon dioxide produced in ... | 07/03/2007 |
| 7220293 | Thermal synthesis production of steel A process for producing liquid steel is disclosed. Carbon monoxide and oxygen may be combusted in a high temperature reactor. Iron and iron oxide materials, along with scrap steel if desired, may be placed in the high temperature reactor. Carbon dioxide produced in ... | 05/22/2007 |
| RE39536 | Method and plant utilizing fine coal in a melter gasifier In a method for the production of liquid metal, in particular liquid pig iron (9) or liquid steel pre-products, from metal carriers, in particular partially reduced or reduced sponge iron (3), in a melter gasifier (1) in which with supply of a c... | 04/03/2007 |
| 7160353 | Process for producing molten iron A method for making molten iron includes the steps of feeding a raw material mixture containing an iron oxide material and a carbonaceous reductant into a heating reduction furnace to reduce iron oxide in the raw material mixture with the carbonaceous reductant into... | 01/09/2007 |
| 7074375 | Method of desulfurizing a hydrocarbon gas by selective partial oxidation and adsorption A hydrocarbon gas such as methane and LPG is desulfurized in the presence of oxygen and an oxidation catalyst to convert sulfur compounds in the gas to sulfur oxides. The sulfur oxides are then trapped downstream of the oxidation by an adsorbent. The amount of oxyge... | 07/11/2006 |
| 6843828 | Method for treating slags or slag mixtures on an iron bath In a method for treating slags or slag mixtures having iron oxide contents of >5 wt.-%, in particular steelworks slags, in which the steel slags optionally mixed with other slags are charged onto a metal bath, a steel bath having a carbon content of | 01/18/2005 |
| 6837916 | Smelting reduction method A smelting reduction method comprising (a) charging a carbonaceous material and an ore into a reacting furnace to directly contact the carbonaceous material and the ore; (b) reducing the ore until at least a part of the ore is metallized, the resultant reduced ore c... | 01/04/2005 |
| 6800113 | Equipment for distribution and feeding of charge and fuel in shaft furnaces of rectangular cross section The present invention refers to an equipment for feeding and distributing charge and fuel in furnaces of rectangular cross section, comprising movable feeding tubes to distribute along the longitudinal section and the cross section of the furnace, both a charge comp... | 10/05/2004 |
| 6749664 | Furnace hearth for improved molten iron production and method of operation An apparatus and method for the direct reduction of iron oxide utilizes a hearth furnace having a vitreous hearth layer of conditioning materials, with the vitreous hearth layer introduced onto a refractory surface of the furnace. The vitreous hearth layer may have ... | 06/15/2004 |
| 6669756 | Discharge apparatus for movable hearth type heat-treatment furnace, its operation method, and method and apparatus for manufacturing molten iron using the same Heat-treated products discharged from a discharge port of a movable hearth type heat treatment furnace, for example a rotary hearth type reduction furnace are discharged to a sorting means, the heat-treated products that foreign substances have been remov... | 12/30/2003 |
| 6648942 | Method of direct iron-making / steel-making via gas or coal-based direct reduction and apparatus The invention is a method and apparatus for iron-making/steel-making using a modified rotary hearth furnace, that is a finisher-hearth-melter (FHM) furnace. In the method the refractory surface of the hearth is coated with carbonaceous hearth conditioners... | 11/18/2003 |
| 6630010 | Method of producing metallic iron The present invention is directed to a method of producing granular metallic iron, including: heating a formed raw material comprising a carbonaceous reductant and a substance containing iron oxide in a reduction melting furnace to subject the iron oxide ... | 10/07/2003 |
| 6626977 | Direct smelting process and apparatus A direct smelting process for producing iron and/or ferroalloys is provided, which involves injecting feed materials into a molten bath of molten metal in a metallurgical vessel to form an expanded molten bath zone, and injecting oxygen containing gas, wh... | 09/30/2003 |
| 6602320 | Method for producing reduced iron A method for producing reduced iron comprises agglomerating a raw material mixture containing a carbonaceous reducing agent and an iron oxide-containing material into small agglomerates, heating the agglomerate within a heat reduction furnace, thereby sol... | 08/05/2003 |
| 6592647 | Method for producing metallic iron A method for heating, reducing and melting a raw material mixture containing carbonaceous reducing agents and an iron oxide-contained substance to manufacture metallic iron, characterized in that a liquid fraction in a solid and liquid coexisting phase of... | 07/15/2003 |
| 6506231 | Method and apparatus for making metallic iron A method of making metallic iron in which a compact, containing iron oxide such as iron ore or the like and a carbonaceous reductant such as coal or the like, is used as material, and the iron oxide is reduced through the application of heat, thereby maki... | 01/14/2003 |
| 6503289 | Process for manufacturing molten metal iron A process comprising: charging a raw material compacting substance containing a carbonaceous reducing agent and an iron oxide contained substance into a moving hearth type furnace; reducing the raw material compacting substance to a reducing ratio 30 to 8... | 01/07/2003 |
| 6451084 | Iron oxide waste agglomerates and method of assisting a steel-making operation An iron oxide waste agglomerate, preferably a briquette, is provided including 0.03-15 weight percent on a dry basis lignosulfonate binder, 50-99.5 weight percent on a dry basis iron oxide waste, and 0.3-20 weight percent water. The agglomerate can furthe... | 09/17/2002 |
| 6440195 | Process and an apparatus for producing metals and metal alloys A process and an apparatus for producing metals from a metalliferous feed material are disclosed. The process includes the steps of partially reducing and at least partially melting a metalliferous feed material in a pre-reduction/melting means and comple... | 08/27/2002 |
| 6423115 | Direct smelting process A direct smelting process for producing metals from a metalliferous feed material is disclosed. The process includes forming a molten bath having a metal layer (15) and a slag layer (16) on the metal layer in a metallurgical vessel, injecting metalliferou... | 07/23/2002 |
| 6413295 | Iron production method of operation in a rotary hearth furnace and improved furnace apparatus The present invention is an apparatus and method for the direct reduction of iron oxide utilizing a rotary hearth furnace to form a high purity carbon-containing iron metal button. The hearth layer may be a refractory or a vitreous hearth layer of iron ox... | 07/02/2002 |
| 6409790 | Method and apparatus for practicing carbonaceous-based metallurgy An energy efficient, coal-based method and apparatus that are environmentally friendly which produce under pressure metallized/carbon product and molten metal directly from abundant coal or other carbonaceous material, and low cost fines (or ore concentra... | 06/25/2002 |
| 6402808 | Direct smelting process A process for direct smelting a metalliferous feed material is disclosed. Char and fuel gas are produced by pre-treating coal with an oxygen-containing gas. The fuel gas is used to heat an oxygen-containing gas and/or to produce an oxygen-containing gas i... | 06/11/2002 |
| 6379422 | Direct smelting process A process for direct smelting metalliferous feed material is disclosed. Iron oxides are partially reduced in a solid state in a pre-reduction vessel. The partially reduced iron oxides are smelted to molten iron in a direct smelting vessel which contains a... | 04/30/2002 |
| 6379424 | Direct smelting apparatus and process A vessel which produces metal from a feed material by direct smelting is disclosed. The vessel contains a molten bath having a metal layer (15) and a slag layer (16) on the metal layer and a gas continuous space (31) above the slag layer. The vessel inclu... | 04/30/2002 |
| 6368548 | Direct smelting process and apparatus A direct smelting process for producing metals from metalliferous feed material is disclosed. The process includes forming a molten bath having a metal layer and a slag layer on the metal layer and smelting injected metalliferous feed material in the meta... | 04/09/2002 |
| 6364929 | Method for reprocessing steel slags and ferriferous materials The invention relates to a method for processing steel slags and iron carriers such as, e.g., electric furnace slags, converter slags, fine ores, dusts from the production of steel and millscale, for recovering pig iron and environmentally safe slags. A m... | 04/02/2002 |
| 6332911 | Method and plant of utilizing fine coal in a melter gasifier In a method for the production of liquid metal, in particular liquid pig iron (9) or liquid steel pre-products, from metal carriers, in particular partially reduced or reduced sponge iron (3), in a melter gasifier (1) in which with supply of a carbon-cont... | 12/25/2001 |
| 6289034 | Process and an apparatus for producing metals and metal alloys A process for producing metals from a metalliferous feed material in an electric furnace is disclosed. The process includes the steps of forming a molten bath having a metal layer and a slag layer on the metal layer in the furnace and supplying electrical... | 09/11/2001 |
| 6287363 | Method of utilizing dusts produced during the reduction of iron ore In a method of effectively utilizing dusts incurring in the reduction of iron ore by means of a reducing gas and separated on that occasion in a scrubber in the form of sludges, the sludges at first are dehydrated and are used as starting materials for th... | 09/11/2001 |
| 6277172 | Method of charging metal carriers to a melt-down gasifying zone In a method of charging metal carriers which contain a portion of fines and are at least partially reduced and carbon carriers to a melter gasifier (10) in which a melt-down gasifying zone (11) is maintained, the metal carriers and the carbon carriers are... | 08/21/2001 |
| 6273933 | Method for blowing fine particles containing metal oxide into a reducing gas According to a process for injecting metal-oxide-containing fine particles into a reducing gas, a central material stream formed by the fine particles and a carrier gas is introduced into the reducing gas and at least one gas stream formed by a secondary ... | 08/14/2001 |
| 6273934 | Method and an apparatus for producing metals and metal alloys A method of producing metals and metal alloys from metal oxides is disclosed. The method comprises the steps of partially pre-reducing the metal oxides to a pre-reduction degree of at least 60% in one or more pre-reduction stages. Thereafter, the method c... | 08/14/2001 |
| 6264724 | Process for the production of spongy metal A plant for producing sponge metal, in particular sponge iron, from charging materials consisting of metal ore or iron ore respectively, preferably in lumps and/or pellets, and optionally fluxes, comprising at least one first gas source (1, 3) dispensing ... | 07/24/2001 |
| 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 |
| 6258148 | Method of charging metal carriers to a melt-down gasifying zone In a method of charging metal carriers which contain a portion of fines and are at least partially reduced to a melter gasifier in which a melt-down gasifying zone formed by a bed is maintained, the metal carriers and carbon carriers are fed into the melt... | 07/10/2001 |
| 6251162 | Process for the production of liquid pig iron or liquid intermediate products of steel In a method for producing liquid pig iron or liquid steel pre-products from charging substances comprising iron ore, preferably in lumps or pellets, and optionally fluxes. The charging substances are directly reduced to sponge iron in a reduction zone (12... | 06/26/2001 |
| 6241797 | Process for reducing oxidic slags There is disclosed a process for reducing oxidic slags or combustion residues above a metal bath. The metal bath is formed of an iron alloy containing metals nobler than iron and whose redox potential is adjusted such FeO is reduced to Fe not at all or on... | 06/05/2001 |
