| Patents for C21B 13 - Making spongy iron or liquid steel, by direct processes (6,991) |
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| 12/26/1989 | US4889323 Steel making |
| 12/12/1989 | US4886246 Metal-making apparatus involving the smelting reduction of metallic oxides |
| 11/30/1989 | DE3817433A1 Process for the direct reduction of iron oxide-containing materials in a rotary kiln |
| 11/29/1989 | CN1037542A Process and apparatus for post combustion |
| 11/23/1989 | EP0342374A1 Method for smelting reduction in electric furnace |
| 11/21/1989 | US4881972 Process for feeding heat energy into a molten metal bath |
| 11/14/1989 | US4880459 Reforming reduced gas, catalytic reforming |
| 11/14/1989 | US4880458 Reduction of iron ore, loops |
| 11/08/1989 | CN1036990A Method and apparatus for reduction of meterial containing metal oxide |
| 11/07/1989 | US4878943 Iron oxide reduction, sponge iron, cooling, dedusting |
| 11/02/1989 | DE3912260A1 Process and equipment for melting scrap iron and scrap steel |
| 11/01/1989 | CN1036797A Method for producing chromium-containing molten iron with low sulphur concentration |
| 10/31/1989 | CA1262510A1 Smelting process and apparatus for recovering metals from non-ferrous metal, sulphide ores or concentrates |
| 10/17/1989 | US4874427 Using reducing gas; then oxidation |
| 10/11/1989 | EP0336920A2 Process for charging of pig iron and installation for performing that process |
| 10/11/1989 | CN1036247A Cogeneration process for production of energy and iron materials, including steel |
| 10/05/1989 | WO1989009290A1 Method and apparatus for reduction of material containing metal oxide |
| 10/05/1989 | DE3908787A1 Process and installation for producing liquid metal from lumpy, oxide-containing feedstocks |
| 09/28/1989 | DE3908505A1 Process for producing liquid pig iron in a smelting gasifier |
| 09/19/1989 | US4867787 Mill arrangement with temporary storage vessel and a process of operating the same |
| 09/13/1989 | EP0331751A1 PROCESS FOR DECARBURIZING HIGH-Cr MOLTEN PIG IRON |
| 08/30/1989 | EP0330483A2 Process for producing chromium containing molten iron |
| 08/30/1989 | EP0330482A2 Method for producing chromium containing molten iron with low sulphur concentration |
| 08/30/1989 | CN1035136A Process and apparatus for smelting and reducing iron ores |
| 08/30/1989 | CN1035135A Method of charging chromium ores in smelting reduction |
| 08/29/1989 | US4861369 Process for gaining electric energy in addition to producing molten pig iron and an arrangement for carrying out the process |
| 08/29/1989 | US4861368 Method for producing iron |
| 08/23/1989 | EP0328677A1 PROCESS FOR MELT REDUCTION OF Cr STARTING MATERIAL AND MELT REDUCTION FURNACE |
| 08/16/1989 | EP0327862A2 A process of and an apparatus for post combustion |
| 08/16/1989 | CN1034759A Process for feeding heat energy into molten metal bath |
| 08/15/1989 | US4857284 Scrubbing desulfurization |
| 08/15/1989 | US4857105 Process for producing pig iron using coal degassing reactor to form reductants |
| 08/08/1989 | US4854967 Process for producing carburized sponge iron |
| 08/02/1989 | EP0326403A2 Process for melting cold iron material |
| 08/02/1989 | EP0326402A2 Smelting reduction process |
| 08/02/1989 | CN1034394A Method of smelting reduction of ores containing metal oxides |
| 08/01/1989 | US4853033 Method of desulfurizing molten metal in a plasma fired cupola |
| 08/01/1989 | US4852858 Charging material preheater for preheating charging material for a metallurgical smelting unit |
| 07/26/1989 | CN1004880B Process for producing sponge iron |
| 07/26/1989 | CN1004879B Process for the smelting reduction of ores |
| 07/25/1989 | US4851040 Direct reduction |
| 07/25/1989 | US4851039 Fine ore is reduced, sponge iron is melted and reduced |
| 07/25/1989 | US4850574 Apparatus for cooling and cleaning producer gas and top gas |
| 07/25/1989 | CA1257774A1 Process and an arrangement for the production of molten pig iron and steel pre-products |
| 07/19/1989 | CN1034053A Method of and apparatus for melting metal waste |
| 07/19/1989 | CN1034022A Metal-making apparatus involving smelting reduction of metallic oxides |
| 07/18/1989 | US4849015 Heat exchanging using afterburned gases |
| 07/11/1989 | US4846449 Melting gasifier |
| 07/05/1989 | CN1033649A Process for directly reducing iron oxide-containing materials in rotary kiln |
| 07/05/1989 | CN1033648A Production of clean spongy iron in shaft furnace by reducing iron scale with coke powder |
| 07/05/1989 | CN1033646A Microorganism having low acetate forming capability and process for production of useful substrate using same |
| 07/05/1989 | CN1004706B Arrangement comprising gasifier and direct reduction furnace |
| 06/28/1989 | CN1033529A Process for continuously melting scrap as well as apparatus for performing this process |
| 06/21/1989 | EP0321443A2 Process and installation for continuously melting scrap |
| 06/21/1989 | EP0321018A1 Process for the direct reduction of iron-containing materials in a rotary furnace |
| 06/21/1989 | EP0320999A1 Method for smelting reduction of iron ore and apparatus therefor |
| 06/21/1989 | EP0320587A1 Process and apparatus for melting scrap metal |
| 06/21/1989 | EP0302111A4 Method and furnace for making iron-carbon intermediate products for steel production. |
| 06/15/1989 | DE3806861C1 Transport installation for hot iron sponge |
| 06/14/1989 | EP0319966A2 Method of smelting reduction of ores containing metal oxides |
| 06/14/1989 | EP0319836A1 Method and apparatus for operating a melting gasifier |
| 06/13/1989 | US4838934 Carbonaceous reducing agent is separated by particle sizes; uniform remixing gives rapid combustion |
| 06/13/1989 | CA1255498A1 Shaft furnace arrangement for the direct reduction of iron ores |
| 06/07/1989 | EP0318896A2 Method for smelting reduction of iron ore and apparatus therefor |
| 06/06/1989 | US4836998 Production of partially calcined carbonaceous reductant using steam |
| 06/06/1989 | US4836847 Method for reclaiming metal values from electric arc furnace flue dust and sludge and rendering residual solids recyclable or non-hazardous |
| 06/06/1989 | CA1255352A1 Shroud for arc furnace |
| 06/06/1989 | CA1255245A1 Process for the manufacture of coke granulates as a carburizing agent |
| 05/30/1989 | US4834792 Method for producing hot sponge iron by introducing hydrocarbon for carburizing into reduction zone |
| 05/30/1989 | US4834791 Method for producing raw iron from iron concentrates for the manufacture of gas, and plant apparatus for carrying out the method |
| 05/24/1989 | EP0316819A1 Metal-making process and apparatus involving the smelting reduction of metallic oxides |
| 05/18/1989 | WO1989004445A1 System for conveying bulk materials |
| 05/18/1989 | WO1989004365A1 Microorganism having low acetate forming capability and its application |
| 05/18/1989 | DE3811654A1 Verfahren zur direktreduktion von eisen und vorrichtung zur durchfuehrung des verfahrens Process for the direct reduction of iron and apparatus for performing the method |
| 05/17/1989 | EP0316299A2 Process of dezincifying a material flow operating a pig-iron production plant |
| 05/17/1989 | EP0316229A1 Microorganism having low acetate forming capability, and process for production of useful substrate using same |
| 05/17/1989 | EP0315825A1 Pretreatment of a carbonaceous carrier |
| 05/09/1989 | US4828607 Replacement of coke in plasma-fired cupola |
| 05/03/1989 | DE3743745C1 Method for constructing a shaft furnace, and shaft furnace |
| 04/27/1989 | DE3734892A1 Process for dressing metallurgical dusts |
| 04/26/1989 | EP0313547A1 Continuous steel melting process |
| 04/26/1989 | CN1032553A Process for continuously melting of steel |
| 04/26/1989 | CN1032552A Process and apparatus for melting and reducing iron ore |
| 04/25/1989 | US4824479 Method for producing a carbonaceous solid reductant for direct reduction of iron ore |
| 04/19/1989 | EP0311978A1 Process for delivering heat to molten metal |
| 04/18/1989 | US4822411 Integrated steel mill arrangement |
| 04/11/1989 | US4820313 Coal processing method and apparatus |
| 04/06/1989 | DE3731851A1 Process for producing a metal melt |
| 04/05/1989 | CN1032193A Process for melting scrap iron, sponge iron and/or solid pig iron or the like |
| 04/05/1989 | CN1032192A Method for preparation of ferrocarbon intermediate product for use in steel manufacture, and furnace for realization thereof |
| 03/29/1989 | EP0308925A1 Method and apparatus for smelting and reducing iron ores |
| 03/29/1989 | CN1032034A Method of decarburizing high cr molten metal |
| 03/23/1989 | WO1989002479A1 Process for decarburizing high-cr molten pig iron |
| 03/23/1989 | WO1989002478A1 Process for producing molten stainless steel |
| 03/23/1989 | WO1989002477A1 Method of charging ore in melt-reduction |
| 03/09/1989 | WO1989001981A1 Congeneration process for production of energy and iron materials, including steel |
| 02/28/1989 | CA1250540A1 Method of producing reduced iron and light oil from iron ore and heavy oil |
| 02/23/1989 | WO1989001532A1 Process for melt reduction of cr starting material and melt reduction furnace |
| 02/23/1989 | DE3727039A1 Process for steel smelting using iron sponge |
| 02/22/1989 | EP0304413A1 Method for melting scrap, sponge iron and/or solid pig iron or the like |