| Patents for C21B 13 - Making spongy iron or liquid steel, by direct processes (6,991) |
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| 03/31/1992 | US5100314 Apparatus and process for direct reduction of materials in a kiln |
| 03/26/1992 | DE4030093A1 Granular iron ore direct redn. in blast furnace using natural gas - with high ethane content as source of methane for producing carbon mon:oxide and hydrogen@ |
| 03/26/1992 | DE4030054A1 Verfahren und anlage zum reduktionsgluehen von eisenpulver Method and system for reduktionsgluehen of iron powder |
| 03/18/1992 | EP0474704A1 Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 03/11/1992 | EP0449891A4 Manufacture of iron and steel in a duplex smelter and solid state oxide suspension prereducer |
| 02/20/1992 | WO1992002824A1 Method for controlling the conversion of iron-containing reactor feed into iron carbide |
| 02/20/1992 | WO1992002644A1 Slag control apparatus and method |
| 02/19/1992 | CN1058807A Process of and apparatus for post combustion |
| 02/19/1992 | CN1015551B Process for melting scrap iron, sponge iron and/or solid pig iron or the like |
| 02/19/1992 | CN1015550B Process for direct reduction of iron oxide containing materials in rotary kiln |
| 02/19/1992 | CN1015549B Method of smelting reduction of ores containing metal oxides |
| 02/02/1992 | WO1992002647A1 Process for controlling the product quality in the conversion of reactor feed into iron carbide |
| 02/02/1992 | WO1992002646A1 Process for preheating iron-containing reactor feed prior to being treated in a fluidized bed reactor |
| 02/02/1992 | WO1992002458A1 Fluidized bed reactor and process for using same |
| 02/02/1992 | CA2087608A1 Fluidized bed reactor and process for using same |
| 02/02/1992 | CA2087601A1 Process for controlling the product quality in the conversion of reactor feed into iron carbide |
| 01/28/1992 | US5084093 Method for manufacturing molten pig iron |
| 01/22/1992 | EP0467874A1 Method for reprocessing steel mill dust and installation using this method |
| 01/21/1992 | US5082251 Plant and process for fluidized bed reduction of ore |
| 01/15/1992 | CN1057800A Spongy iron heat diffusion body and its preparation method |
| 01/14/1992 | WO1992000801A1 Method and apparatus for treating gases and/or solid material in a circulating fluidized bed reactor |
| 01/14/1992 | CA2087253A1 Method and apparatus for treating gases and/or solid material in a circulating fluidized bed reactor |
| 01/07/1992 | US5078788 Using heavy hydrocarbon oil as natural gas source in a simultaneous reforming-reduction process |
| 01/07/1992 | US5078787 Method and apparatus for the production of hot direct reduced iron |
| 01/07/1992 | US5078785 Monitoring and controlling slag density in steelmaking, monitoring carbon content of slag |
| 01/01/1992 | CN1057487A Prereduction furnace of senelting reduction facility of iron ore |
| 01/01/1992 | CN1057486A Method and apparatus for production of hot direct reduced iron |
| 12/31/1991 | US5076838 Process for direct reduction of materials in a kiln |
| 12/27/1991 | EP0462515A2 Prereduction furnace of a smelting reduction facility of iron ore |
| 12/26/1991 | WO1991019819A1 Method and apparatus for steel making |
| 12/24/1991 | US5074530 Efficiency of heat transfer |
| 12/17/1991 | US5073194 Process for controlling the product quality in the conversion of reactor feed into iron carbide |
| 12/04/1991 | EP0459810A2 Method and apparatus for the production of hot direct reduced iron |
| 12/04/1991 | CN1014996B Metal-making apparatus involving smelting reduction of metallic oxides |
| 12/03/1991 | US5069716 Process for the production of liquid steel from iron containing metal oxides |
| 12/03/1991 | US5069429 Plant for treating and melting metals, metal compounds and/or metal alloys or for producing calcium carbide |
| 11/19/1991 | US5066325 Liquiefaction of coal to remove oil; pelletization, reduction, melting, forming mineral wool; electricity |
| 11/19/1991 | US5065985 Method for smelting reduction of iron ore and apparatus therefor |
| 11/13/1991 | CN1014721B Process and apparatus for melting and reducing iron ore |
| 11/12/1991 | US5064467 Method and apparatus for the direct reduction of iron |
| 11/12/1991 | US5064174 Apparatus for production of energy and iron materials, including steel |
| 10/30/1991 | CN1055763A Process for producing metals and metal alloys in smelt reduction vessel |
| 10/29/1991 | US5060913 Integrated metallurgical reactor |
| 10/23/1991 | CN1014432B Process and apparatus for smelting and rducing iron ores |
| 10/21/1991 | CA2039940A1 Process for the production of liquid steel from iron containing metal oxides |
| 10/15/1991 | CA1290573C Method and apparatus for producing hot direct reduced iron |
| 10/09/1991 | EP0449891A1 Manufacture of iron and steel in a duplex smelter and solid state oxide suspension prereducer. |
| 10/08/1991 | US5055131 Coal is pyrolysed to char, reduction of iron ore with char and generating hot gases, utilization of hot gases as electricity |
| 10/03/1991 | WO1991014792A2 A method of molten iron continuous production |
| 10/01/1991 | CA1289743C Plant for producing steel from scrap |
| 09/24/1991 | US5051127 Process for post combustion |
| 09/24/1991 | US5050848 Apparatus for post combustion |
| 09/19/1991 | WO1991014005A1 A process for producing metals and metal alloys in a smelt reduction vessel |
| 09/18/1991 | EP0446860A1 A process for producing metals and metal alloys in a smelt reduction vessel |
| 09/17/1991 | CA1288953C Process for the production of pig iron from fine ore |
| 09/11/1991 | CN1054447A Prereduction furnace of smelting reduction facility of iron ore |
| 09/11/1991 | CN1054446A Prereduction furnace of smelting reduction facility of iron ore |
| 09/10/1991 | US5047082 Adding carbon, vlowing oxygen, discharging slag |
| 09/10/1991 | US5047081 Blowing oxygen diluted with inert gas from furnace top and inert gas from bottom to agitate; controlling slag amount |
| 09/04/1991 | EP0444634A2 Prereduction furnace of a smelting reduction facility of iron ore |
| 09/04/1991 | EP0444614A2 Prereduction furnace of a smelting reduction facility of iron ore |
| 09/04/1991 | CN1013805B Process of thermally threating lump or agglomerated materials on a moving grate |
| 09/03/1991 | US5045112 Coal liquefaction, pyrolysis; iron reduction, melting |
| 08/29/1991 | DE4030272A1 Treating metallic sludge contaminated with oil and other impurities - by superheating in shaft furnace and passing iron ore, carbon, scrap etc. into superheated melt to give steel or cast iron melt |
| 08/27/1991 | US5043011 Process for producing pig iron |
| 08/27/1991 | CA1287982C Method for melt-reducing iron ore |
| 08/21/1991 | CN1013588B Process for utilizing rich iron but poor manganese ore |
| 08/13/1991 | US5039480 Method for manufacturing molten metal containing Ni and Cr |
| 08/10/1991 | CA2035723A1 Plant for treating and melting metals, metal compounds and/or metal alloys or for producing calcium carbide |
| 08/07/1991 | CN1013452B Method of charging chromium ores in smelting reduction |
| 08/06/1991 | CA1287216C Apparatus and method for increasing carbon content of hot directly reduced iron |
| 08/06/1991 | CA1287209C Method for increasing carbon content of direct reduced iron |
| 07/24/1991 | CN1013280B Method of decarburizing high cr molten metal |
| 07/24/1991 | CN1013279B Method for mfg. chromium-bearing pig iron |
| 07/23/1991 | CA1286505C Method for producing iron |
| 07/17/1991 | EP0436718A1 Method of charging ore in melt-reduction |
| 07/16/1991 | CA1286114C Process for the production of pig iron |
| 07/16/1991 | CA1286113C Method for the melt reduction of iron ores |
| 07/16/1991 | CA1286107C Apparatus and process for producing ferrous or non-ferrous metals from self-fluxing or not, self-reducing agglomerates or ores |
| 07/10/1991 | CN1052899A Method for controlling flow rate of gas for prereducing ore and apparatus therefor |
| 07/02/1991 | US5028388 Method for producing chromium containing molten iron with low sulphur concentration |
| 06/26/1991 | CN1012965B Process of reducing fine-grained iron-containing material by means of solid carbonaceous reducer |
| 06/12/1991 | EP0431556A1 Method for controlling a flow rate of gas for prereducing ore and apparatus therefor |
| 05/22/1991 | EP0428098A2 Improved method of reducing iron ore |
| 05/21/1991 | US5017220 Method for smelting reduction of Ni ore |
| 05/21/1991 | CA1284274C Melt-reductive iron making method from iron ore |
| 05/15/1991 | EP0427710A1 Smelting reduction |
| 05/15/1991 | CN1012622B Method for mfg. steel through smelting reduction |
| 05/08/1991 | CN1012580B Sponge iron smelting technique and furnace type |
| 05/07/1991 | US5013355 From sulfidic ores, flame smelting |
| 04/30/1991 | CA1283542C Process for cooling and cleaning producer gas and blast furnace gas and apparatus for performing this process |
| 04/23/1991 | US5009397 Plant to be used for metallurgical treatments of metal compounds and/or metal alloys or for producing calcium carbide |
| 04/17/1991 | EP0422309A1 Shaftfurnace for the reduction of iron ore with hydrogen to metallized iron powder for sintering |
| 04/09/1991 | CA1282599C Process and apparatus for producing sponge iron particles and molten pig iron |
| 04/03/1991 | EP0419868A1 Method of in-bath smelting reduction of metals and in-bath smelting reduction furnace |
| 03/27/1991 | EP0418627A1 Method of operating in-bath smelting reduction furnace |
| 03/26/1991 | CA1281907C Metallurgical composites and processes |
| 03/21/1991 | WO1991003575A1 Integrated metallurgical reactor |
| 03/20/1991 | EP0417296A1 Direct smelting process |
| 03/20/1991 | EP0277947B1 Apparatus for producing ferrous or non-ferrous metals from self-fluxing or not, self-reducing agglomerates or ores |