| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 075500000 | Reduction in molten state | 8 |
| 20080302212 | Method for Manufacturing Molten Irons and Apparatus for Manufacturing Molten Irons - A method for manufacturing molten iron that improves charging and discharge of the fine iron ore, and an apparatus for manufacturing molten iron using the same. The apparatus for manufacturing molten iron includes i) at least one fluidized-bed reduction reactor that reduces fine iron ore and converts the fine iron ore into reduced iron, ii) a fine iron ore charging bin that supplies the fine iron ore to the fluidized-bed reduction reactor, iii) a fine iron ore charging line that directly connects the fine iron ore charging bin to each of the fluidized-bed reduction reactors, and directly charges the fine iron ore into each of the fluidized-bed reduction reactor, iv) a melter-gasifier into which lumped carbonaceous materials and the reduced iron are charged and oxygen is injected, the melter-gasifier manufacturing molten iron, and v) a reducing gas supply line that supplies a reducing gas discharged from the melter-gasifier to the fluidized-bed reduction reactor. | 12-11-2008 |
| 20090282950 | PROCESS FOR PRODUCING METALLIC IRON - A method for manufacturing metallic iron from a raw material mixture containing a carbonaceous reducing agent and an iron oxide-containing material, has a step of determining a target temperature of initial molten slag formation corresponding to a predetermined target carbon concentration in the metallic iron, the initial molten slag containing a gangue component, an unreduced iron oxide, and an ash component of the carbonaceous reducing agent, and being first produced in the raw material mixture by heating thereof; a step of preparing the raw material mixture producing a composition of the initial molten slag corresponding to the target temperature; and a step of heating the raw material mixture to reduce and melt the raw material mixture and to produce the initial molten slag. By this manufacturing method, metallic iron having a target carbon concentration can be efficiently manufactured. | 11-19-2009 |
| 20120180601 | METHOD OF DESULFURIZING STEEL - A method of desulfurizing steel including steps of forming a slag over a molten metal, drawing a vacuum to less than 5 torr over the slag and molten metal, stirring the molten metal and slag, and deoxidizing and desulfurizing the molten metal and slag to degas the steel reducing at least sulfur, nitrogen, oxygen, and hydrogen contents, and reducing activity of oxygen in the molten metal to less than 30 ppm. The method includes forming a slag composition after degassing the steel comprising CaO between about 50 and 70% by weight, SiO | 07-19-2012 |
| 20130167688 | METHOD OF MAKING LOW CARBON STEEL USING FERROUS OXIDE AND MINERAL CARBONATES - A cored wire injection with a filling of iron oxide and mineral carbonate provides an improved method and apparatus for increasing and maintaining dissolved oxygen in the steelmaking process, while also providing a method for forming carbon dioxide for stirring and carbon oxidation in the molten steel bath. The method and apparatus are particularly useful for low carbon steel production by lowering the tap oxygen content in the furnace and preventing high amounts of iron oxide in the slag. Injecting a cored wire containing a mineral carbonate in the ladle after the furnace melting process provides sources of oxygen and a method of stirring the steel and reducing the partial pressure of CO needed to lower the carbon content. | 07-04-2013 |
| 20140318320 | STARTING A SMELTING PROCESS - A method of starting a molten-bath based melting process includes commencing supplying cold oxygen-containing gas and cold carbonaceous material into a main chamber of a smelting vessel within at most 3 hours after completing a hot metal charge into the vessel and igniting the carbonaceous material and heating the main chamber and molten metal in the main chamber. | 10-30-2014 |
| 20150345870 | MOLTEN IRON MANUFACTURING APPARATUS AND MOLTEN IRON MANUFACTURING METHOD - An apparatus for manufacturing molten iron includes: an iron ore-mixing/pre-reducing furnace receiving and mixing natural iron ore and oxidized iron ore supplied from an iron ore oxidizing-burning furnace, and heating or pre-reducing iron ore using flue gas supplied from an iron ore reduction furnace. The iron ore reduction furnace receives pre-processed iron ore discharged from the iron ore-mixing/pre-reducing furnace or partially reduced iron ore, and reduces the iron ore using a reduction gas discharged from a molten gasification furnace that receives coal and some of reduced iron produced by the iron ore reduction furnace and produces molten iron and a reduction gas to be supplied to the iron ore reduction furnace. The iron ore oxidizing-burning furnace receives new iron ore and some of reduced iron and changes the new iron ore into oxidized iron ore including oxygen by burning the new iron ore and the reduced iron with air. | 12-03-2015 |
| 20160102374 | GASIFICATION OR LIQUEFACTION OF COAL USING A METAL REACTANT ALLOY COMPOSITION - This invention relates to a method and apparatus for gasifying or liquifying coal. In particular, the method comprises reacting a coal with a molten aluminum or aluminum alloy bath. The apparatus includes a reaction vessel for carrying out the reaction, as well as other equipment necessary for capturing and removing the reaction products. Further, the process can be used to cogenerate electricity using the excess heat generated by the process. | 04-14-2016 |
| 075501000 | Gas injection below surface of melt | 1 |
| 20110185856 | Ironmaking and Steelmaking - A steelmaking process is disclosed. The process includes producing molten steel and molten steelmaking slag in a steelmaking process, the steelmaking slag including iron units and flux units, and thereafter producing molten iron in a molten bath based direct smelting process using a substantial portion of the steelmaking slag as part of the feed material requirements for the direct smelting process. A direct smelting process is also disclosed. The process includes pre-treating ferrous material including steelmaking slag and thereafter direct smelting molten iron using the pretreated ferrous material as part of the feed material for the process. | 08-04-2011 |
