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| Number | Title | Issue Date |
| 7628839 | Method and system for producing metallic iron nuggets Method and system for producing metallic nuggets includes providing reducible mixture (e.g., reducible micro-agglomerates; reducing material and reducible iron bearing material; reducible mixture including additives such as a fluxing agent; compacts, etc.) on at lea... | 12/08/2009 |
| 7597740 | Recovery of non-ferrous metals from zinc residues The invention relates to a process for the separation and recovery of non-ferrous metals from zinc-bearing residues, in particular from residues produced by the zinc manufacturing industry. The process allows for the valorisation of metal values in a Zn-, Fe- and Pb... | 10/06/2009 |
| 7169205 | Method for producing a melt iron in an electric furnace A process for producing liquid smelting iron in an electric arc furnace includes several electrodes, equipped with a hearth, and containing a heel covered with a non-foaming liquid slag. The process further includes the reduction of the metallic fines, in order to f... | 01/30/2007 |
| 7135053 | Brittle formed product and iron-based power material and method for manufacturing these materials Cotton-like aggregates (B) including grinding chips from an iron-based metal and a grinding fluid containing oil and water are compression molded for forming a brittle compact (C) having the fibrous grinding chips roughly sheared and excessive water and oil removed ... | 11/14/2006 |
| 7018483 | Machine and method for thermal cleaning and separation of metal parts Thermal cleaning and separation of metal parts is performed by a stator from an electric motor. Windings embedded in an organic, insulating material are placed and heated to 250°–500° C. under controlled conditions in a heating chamber, evaporating organic mater... | 03/28/2006 |
| 6918947 | Method for making reduced iron A method for making reduced iron using blast-furnace sludge is provided. The method includes a mixing step of mixing the blast-furnace sludge and an iron-oxide-containing powder to prepare a mixed material, an agglomerating step of agglomerating the mixed material t... | 07/19/2005 |
| 6832564 | Method of operating a multiple hearth furnace A method of operating a multiple hearth furnace with a plurality of vertically aligned hearth floors includes feeding a first material onto the uppermost hearth floor and moving it over the hearth floor before it falls through a drop hole onto the next lower hearth ... | 12/21/2004 |
| 6582492 | Method for producing melt iron The invention concerns a method for producing melt iron comprising the following steps: a) reducing the iron ore particles to form pre-reduced iron comprising excess free carbon; b) hot process transfer of the pre-reduced iron in a smelting furnace; c) sm... | 06/24/2003 |
| 6464752 | Method for producing directly reduced, desulphurized iron The invention relates to a method for producing directly reduced, desulfurized iron in a multiple-hearth furnace which comprises two zones arranged one above the other and each having several hearths. Iron ore is reacted with a reducing agent in a first z... | 10/15/2002 |
| 6451086 | Process for thermal treatment of residual materials containing heavy metal and iron oxide A process for thermal treatment of residual materials containing heavy metal and iron oxide, including providing a multiple-hearth furnace having hearths provided one above the other, depositing the residual materials continuously on a top hearth of the h... | 09/17/2002 |
| 6391088 | Method for heat-treating recyclings containing oil and iron oxide Process for thermal treatment of residual materials containing oil and iron oxide in a multiple-hearth furnace, which has several hearths one above the other, the residual materials containing oil and iron oxide being mixed with a solid reducing agent, in... | 05/21/2002 |
| 6383252 | Method for the heat treatment of residues containing heavy metals The invention relates to a method for the heat treatment of residues containing heavy metals, carried out in a multiple-hearth furnace which is divided into three zones, each of which comprises several stacked levels. Said method consists of the following... | 05/07/2002 |
| 6379426 | Fluidized bed reduction of laterite fines with reducing gases generated in situ The present invention is concerned with a method for the pre-reduction of laterite fines in a reactor, preferably a fluidized bed, with reducing gases generated in situ by adding a reducing agent such as a carbonaceous material in the fluidized bed chambe... | 04/30/2002 |
| 6120577 | Treatment of steel mill waste metal oxides A process of recovering iron values and separating zinc oxides and other contaminants from steel mill waste metal oxides, such as blast furnace dust, BOF dust, mill scale and oily sludges, characterized by iron metallization levels up to 95% or more and z... | 09/19/2000 |
| 4976776 | Method for reduction of material containing metal oxide using a fluidized bed reactor and flame chamber A method and apparatus for producing, in a reactor, a suitable prereduced product for final reduction from material containing metal oxide. The material is preheated in a fluidized bed by means of hot gases from a subsequent prereduction stage. The hot ma... | 12/11/1990 |
| 4874427 | Methods for melting and refining a powdery ore containing metal oxides A powdery or fine granular ore containing metal oxides is melted and refined by charging the ore and a part of a reducing gas discharged from a vertical type of melting and reducing furnace into a fluidized bed type of preliminary reducing furnace to prel... | 10/17/1989 |
| 4023963 | Process for the direct reduction of minerals on a continuous grate In a method of reduction of a mineral on a continuous moving grate, the material layer is passed through a plurality of processing zones of the grate on a layer of chemically inert material and the gas flows through the layers in the zones alternate betwe... | 05/17/1977 |
