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| Number | Title | Issue Date |
| 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 |
| 6989042 | Direct smelting process and apparatus A molten-bath based direct smelting process and apparatus for producing metals from a ferrous material is disclosed. The process includes injecting feed materials being solid material and carrier gas into a molten bath at a velocity of at least 40 m/s through at lea... | 01/24/2006 |
| 6939391 | Direct smelting process and apparatus A molten bath-based direct smelting process for producing ferrous metal from a ferrous feed material is disclosed. The process is characterised by injecting pro-heated air downwardly into metallurgical vessel at an angle of 20 to 90° C. relative to a horizontal axi... | 09/06/2005 |
| 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 |
| 6547847 | Continuous process for transforming material, yielding controlled composition products and apparatus apt to carry out such process A continuous process and apparatus for transforming, by chemico-physical reactions inside molten slag, materials to be gasified, thermally destroyed, inertized, or from which elements of commercial value are to be recovered, yielding controlled compositio... | 04/15/2003 |
| 6482249 | Direct smelting process A direct smelting process for producing iron and/or ferroalloys is provided, which involves forming a molten bath in a metallurgical vessel, supplying feed materials, injecting oxygen containing gas, generating upward movement of the molten material from ... | 11/19/2002 |
| 6478848 | Direct smelting process A direct smelting process for producing metal from a metalliferous feed material is disclosed. The direct smelting process is a molten bath-based process in which smelting occurs predominantly in the metal layer, carrier gas/metalliferous feed material/so... | 11/12/2002 |
| 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 |
| 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 |
| 6387153 | Stable idle procedure A procedure for holding production of molten metal in a direct smelting process is disclosed. In situations where it is necessary to hold metal production and there is a continuing available supply of oxygen-containing gas and solid carbonaceous material,... | 05/14/2002 |
| 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 |
| 6352574 | Process for direct production of cast iron from fine iron ore and fine coal A process is described for direct production of cast iron starting from iron bearing ore in an apparatus having two communicating chambers in which to carry out the process, comprising the following operations: pre-reduction and pre-heating to founding po... | 03/05/2002 |
| 6332910 | Process for working up steel slags and iron carriers for obtaining pig iron and environmentally safe slags In a process for working up steel slags and iron carriers such as, e.g., electric furnace slags, converter slags, fine ores, dusts from steel production, mill scales for obtaining pig iron and environmentally safe slags, the volume ratio of molten slag to... | 12/25/2001 |
| 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 |
| 6267799 | Method of producing metals and metal alloys A method and an apparatus for producing metals and metal alloys from metal oxides in a metallurgical vessel containing a molten bath having a metal layer and a slag layer is disclosed. The method is characterized by injecting a carrier gas and a solid car... | 07/31/2001 |
| 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 |
| 6214085 | Method for direct steelmaking This invention relates to making steel directly from ore concentrate and non-coking coal to which flux material is added. The method eliminates numerous steps by reducing the ore with the coal in a sealed chamber and under pressure termed "carbotreating" ... | 04/10/2001 |
| 6214084 | Iron manufacturing process Iron ore is reduced to molten iron by introducing the ore into a reactor while combusting coal with pure oxygen in the reactor. The molten iron phase, which forms at the bottom of the reactor, is stirred by injecting carbon monoxide into the molten iron. ... | 04/10/2001 |
| 6197088 | Producing liquid iron having a low sulfur content A method of liquid iron production using high sulfur fuels is provided in which the level of sulfur in the iron is maintained below 0.1%. The low sulfur content is achieved even in the presence of high sulfur concentrations in the reducing gases and witho... | 03/06/2001 |
| 6193781 | Method of smelting iron ore A method of smelting iron ore in which iron oxide and hot char are introduced into a primary reactor to reduce the iron oxide and thereby form a molten pool of elemental iron and iron oxide slag. A carbon containing substance, comprising fixed carbon and ... | 02/27/2001 |
| 6171364 | Method for stable operation of a smelter reactor A process of producing molten iron involves: a) introducing iron oxide, flux, oxygen, nitrogen, carbon, and hydrogen to a smelter reactor; b) maintaining conditions to cause (i) the iron oxide to be reduced, (ii) molten iron to be created and stirred in the bo... | 01/09/2001 |
| 6143054 | Process of producing molten metals A molten bath-based direct smelting process for producing metals from metal oxides (including partially reduced metal oxides) is disclosed. The process includes causing upward movement of splashes, droplets, and streams of molten material from a metal lay... | 11/07/2000 |
| 6083296 | Method of producing metals and metal alloys A method and an apparatus for producing metals and metal alloys from metal oxides in a metallurgical vessel containing a molten bath having a metal layer and a slag layer is disclosed. The method is characterized by injecting a carrier gas and a solid car... | 07/04/2000 |
| 6001148 | Process for obtaining metal from metal oxide A process for producing metals in the reduced state from their oxides using a simple and less expensive facility with lower running cost. A metal oxide in the form of particles is supplied into a high temperature flame from an oxygen burner in a reactor f... | 12/14/1999 |
| 5989309 | Method for injecting fine iron ore in smelting reducing process A method for injecting fine iron ore in a smelting reducing process is disclosed, in which the carrier gas for the iron ore is the discharge gas from a melter gasifier without the need of separate carrier gas. It includes the steps of pre-reducing iron or... | 11/23/1999 |
| 5980606 | Method for reducing sulfuric content in the offgas of an iron smelting process In order to lower the sulfuric content of the offgas from a smelter reactor in which iron oxide is reduced to molten iron, in the presence of sulfur contaminants, a sufficient amount of a source of zinc is included in the charge to the reactor that the co... | 11/09/1999 |
| 5891214 | Smelting reduction method with increased effectiveness The invention relates to a method for increasing the effectiveness of the smelting reduction of oxidic metal carriers, particularly iron ore, and improving the heat efficiency of the charged fuels in the smelting reduction process which takes place in a r... | 04/06/1999 |
| 5885322 | Method for reducing iron losses in an iron smelting process A process of smelting iron that comprises the steps of: a) introducing a source of iron oxide, oxygen, nitrogen, and a source of carbonaceous fuel to a smelting reactor, at least some of said oxygen being continuously introduced through an overhead lance; b) m... | 03/23/1999 |
| 5830259 | Preventing skull accumulation on a steelmaking lance A self-cleaning lance includes a lance body elongated along a longitudinal axis and having an upper end portion and a lower end portion, the lower end portion being spaced apart from the upper end portion along the longitudinal axis. One or more main nozz... | 11/03/1998 |
| 5800592 | Process for producing molten pig iron with melting cyclone A process for producing molten pig iron uses direct reduction of iron ore in a pre-reduction stage followed by a final reduction stage. In the pre-reduction stage iron ore is pre-reduced in a melting cyclone by means of a reducing process gas originating from ... | 09/01/1998 |
| 5647888 | Process for producing metals and metal alloys in a smelt reduction vessel A process and a smelt reduction vessel (1) for producing metals and metal alloys, in particular iron and iron alloys, from metal oxides and ores in a smelt reduction vessel. The process and the vessel are characterized in that loss of liquid and solids wi... | 07/15/1997 |
| 5607495 | Oxygen smelting of copper or nickel sulfides Copper and or nickel sulfide ore concentrates of high intrinsic value are oxygen smelted by introducing such concentrates via feeds (32) into a closed loop extraction circuit in which a molten sulphide carrier composition is forcibly circulated by an R-H ... | 03/04/1997 |
| 5518523 | Converter process for the production of iron A process for the production of iron from ferrous raw materials, the process comprising conducting a production phase and a tapping phase, the production phase including feeding fuel to an iron bath contained in a converter, continuously feeding ferrous r... | 05/21/1996 |
| 5489325 | Process for producing metals and metal alloys in a smelt reduction vessel A process and a smelt reduction vessel (1) for producing metals and metal alloys, in particular iron and iron alloys, from metal oxides and ores in a smelt reduction vessel. The process and the vessel are characterized in that loss of liquid and solids wi... | 02/06/1996 |
| 5480474 | Process and apparatus for smelting reduction of ores or pre-reduced metal carriers A process and apparatus for smelting reduction of ores or pre-reduced metal carriers in the form of an emulsion composed of slag, liquid metal and floating coke particles which pass from a smelting reduction reactor to a separate settling tank through a c... | 01/02/1996 |
| 5472478 | Reduction of metal oxides and vessel A method of reducing metal oxides in a vessel containing a molten bath, the bath comprising a metal layer and a slag layer, wherein metal oxides and carbonaceous material are introduced into the bath, gas is injected into the slag layer to case the erupti... | 12/05/1995 |
