| Patents for C21B 11 - Making pig-iron other than in blast furnaces (2,381) |
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| 07/23/1991 | CA1286505C Method for producing iron |
| 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 |
| 07/02/1991 | US5028388 Method for producing chromium containing molten iron with low sulphur concentration |
| 06/05/1991 | EP0429978A1 Method of and apparatus for continuously discharging molten metal and slag |
| 05/08/1991 | EP0425620A1 Process and device for smelting metals in cupola furnaces run without coke. |
| 04/09/1991 | CA1282599C Process and apparatus for producing sponge iron particles and molten pig iron |
| 03/27/1991 | EP0418627A1 Method of operating in-bath smelting reduction furnace |
| 03/26/1991 | CA1281907C Metallurgical composites and processes |
| 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 |
| 03/19/1991 | US5000784 Method for smelting reduction of iron ore |
| 03/06/1991 | CN1011894B Method and equipment for producing iron alloy |
| 02/26/1991 | US4996694 Method and apparatus for melting iron and steel scrap |
| 02/26/1991 | CA1280610C Smelting shaft furnaces for iron making and their operation |
| 01/23/1991 | CN1048750A Dc electric-are furnace with arc-controlling magnetic mirror |
| 01/09/1991 | CN1011143B Metallurgical composites and processes |
| 01/08/1991 | US4983214 Rotary kiln; drying, preheating, and induration of greenball pellets |
| 01/02/1991 | CA1278430C Process and apparatus for producing sponge iron or pig iron |
| 12/18/1990 | US4978387 Process for the production of molten pig iron |
| 12/18/1990 | US4978106 Iron reduction apparatus |
| 12/11/1990 | US4976776 Preheating and prereducing using recirculated hot gases; energy efficient |
| 11/29/1990 | WO1990014568A1 Process and device for smelting metals in cupola furnaces run without coke |
| 11/15/1990 | DE3936384A1 Shaft furnace for melting of iron |
| 11/14/1990 | EP0397134A1 Shaft furnace for melting of iron |
| 11/07/1990 | CN1010325B Process and apparatus for recovering metal and metal alloy |
| 10/23/1990 | CA1275358C Process for the gasification of sewage sludge |
| 09/26/1990 | CN1009736B Process for the production of pig iron |
| 09/25/1990 | US4958808 Hot reduction bas (carbon monoxide) from coal-to-gas plant |
| 09/18/1990 | US4957545 Smelting reduction process using reducing gas generated in precombustor |
| 09/05/1990 | CN1045127A Improvements in or relating to pre-reduced iron oxide |
| 08/29/1990 | CN1009373B Method for producing raw iron foro iron concentrates and for the manufacture of gas, and plant apparatus for carrying out the metlhod |
| 08/22/1990 | EP0382900A1 Method for manufacturing molten pig iron |
| 08/07/1990 | US4946498 Process for the production of steel from fine ore hot briquetted after fluidized bed reduction |
| 07/27/1990 | WO1990008843A1 Direct smelting process |
| 07/18/1990 | EP0377636A1 Congeneration process for production of energy and iron materials, including steel |
| 06/28/1990 | WO1990007010A1 Manufacture of iron and steel in a duplex smelter and solid state oxide suspension prereducer |
| 05/16/1990 | EP0368835A1 Process for the production of molten pig iron and plant for carrying out the process |
| 05/16/1990 | EP0368266A1 Process and cupola installation for the production of high-grade iron |
| 05/16/1990 | CN1042185A Process and apparatus for making molten iron |
| 05/08/1990 | CA1268633A1 Method of producing molten pig iron or steel pre- products from particulate ferrous material |
| 05/01/1990 | US4921532 Supplying iron ore and coke, injection of coal and oxygen in stoichiometric amount for carbon monoxide and hydrogen production |
| 04/25/1990 | EP0364865A1 Method for producing steel from ore fines |
| 04/24/1990 | US4919713 Using scrap iron(or steel), pig iron, chromic oxide; efficiency |
| 04/03/1990 | US4913734 Method for preparing ferrocarbon intermediate product for use in steel manufacture and furnace for realization thereof |
| 04/03/1990 | US4913733 Compressing and scrubbing carbon dioxide from top gas, adding to melt-down gasifier |
| 03/20/1990 | CA1266780A1 Process for producing pig iron |
| 03/13/1990 | US4908059 Feeding carbon containing solids and oxygen into precombustion chamber, effecting primary combustion and yielding reducing gas, separating residues, introducing reducing gas and oxygen into melting furnace for secondary combustion |
| 02/14/1990 | CN1039620A Method for smelting molten iron directly from powdered coal and tiron ore |
| 02/07/1990 | EP0353541A2 A method of recycling steel belted tires |
| 02/06/1990 | US4898366 Apparatus for charging a melting gasifier with gasification media and sponge iron |
| 01/30/1990 | US4896810 Apparatus for melting scrap |
| 01/03/1990 | EP0349167A2 Method of desulfurizing molten metal in a plasma fired cupola |
| 01/02/1990 | US4891062 Prevention of damage |
| 12/26/1989 | US4889556 Method of recycling steel belted tires |
| 12/07/1989 | DE3913287A1 Koksloser, gasbefeuerter kupolofen Cokeless, gas-fired cupola |
| 11/29/1989 | CN1037542A Process and apparatus for post combustion |
| 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 |
| 10/11/1989 | EP0336121A2 Process for operating a cupola furnace |
| 10/05/1989 | WO1989009290A1 Method and apparatus for reduction of material containing metal oxide |
| 09/28/1989 | DE3908505A1 Process for producing liquid pig iron in a smelting gasifier |
| 09/14/1989 | DE3904206A1 Verfahren zum betreiben eines kokslosen, gasgefeuerten kupolofens A method of operating a cokeless, gas-fired cupola |
| 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 |
| 08/29/1989 | US4861368 Method for producing iron |
| 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 |
| 08/08/1989 | CA1258179A1 Method of producing a mixed gas and a plant therefor |
| 08/02/1989 | EP0326403A2 Process for melting cold iron material |
| 08/02/1989 | EP0326402A2 Smelting reduction process |
| 08/01/1989 | US4853033 Method of desulfurizing molten metal in a plasma fired cupola |
| 07/26/1989 | CN1004879B Process for the smelting reduction of ores |
| 07/25/1989 | US4851039 Fine ore is reduced, sponge iron is melted and reduced |
| 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 |
| 07/18/1989 | US4849015 Heat exchanging using afterburned gases |
| 07/11/1989 | US4846449 Melting gasifier |
| 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. |
| 06/14/1989 | EP0319836A1 Method and apparatus for operating a melting gasifier |
| 06/07/1989 | EP0318896A2 Method for smelting reduction of iron ore and apparatus therefor |
| 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 |
| 05/18/1989 | WO1989004446A1 Conveyor system for metered conveying of bulk materials |
| 05/18/1989 | WO1989004445A1 System for conveying bulk materials |
| 05/17/1989 | EP0316299A2 Process of dezincifying a material flow operating a pig-iron production plant |
| 04/13/1989 | DE3733349A1 Method and apparatus for melting down scrap, sponge-iron pellets or the like |
| 04/11/1989 | US4820313 Coal processing method and apparatus |
| 04/05/1989 | CN1032192A Method for preparation of ferrocarbon intermediate product for use in steel manufacture, and furnace for realization thereof |
| 03/09/1989 | WO1989001981A1 Congeneration process for production of energy and iron materials, including steel |
| 02/21/1989 | US4805880 Fluidized bed arrangement for the production of molten pig iron and steel pre-products |
| 02/08/1989 | EP0302111A1 Method and furnace for making iron-carbon intermediate products for steel production |
| 01/25/1989 | EP0179014B1 Process for making pig iron |
| 01/18/1989 | EP0299231A1 Method for charging fuel and sponge iron into a melting furnace |
| 01/17/1989 | US4798624 Energy required is generated from afterburining gases produced from carbonaceous fuels |
| 01/03/1989 | CA1247864A1 Process for the production of pig iron |
| 12/27/1988 | US4793855 Process for the gasification of sewage sludge |