| Patents for C21B 13 - Making spongy iron or liquid steel, by direct processes (6,991) |
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| 04/14/1981 | US4261734 Highly efficient gaseous reduction of iron ore |
| 04/07/1981 | US4260412 Method of producing direct reduced iron with fluid bed coal gasification |
| 03/10/1981 | US4255185 Processes and apparatus for reducing and subsequently pelletizing moist fine-grained ore |
| 03/10/1981 | US4254876 Method and apparatus for separating insufficiently cooled metal sponge particles from a mass of such particles |
| 03/03/1981 | US4254167 Partially hydrated lime coating |
| 03/03/1981 | US4253867 Method of using a methane-containing gas for reducing iron ore |
| 02/17/1981 | US4251267 Using a gas seal to prevent leakage of reduction gas from the bottom of shaft furnace |
| 02/03/1981 | US4248626 Method for producing molten iron from iron oxide with coal and oxygen |
| 02/03/1981 | US4248623 Process for the direct reduction of iron ores |
| 02/03/1981 | US4248408 Method and apparatus for reducing particulate iron oxide to molten iron with solid reductant and oxy-fuel burners |
| 01/27/1981 | US4247323 Carbonaceous reducing agents |
| 01/27/1981 | CA1094325A1 Metal refining method |
| 01/20/1981 | US4246024 Method for the gaseous reduction of metal ores using reducing gas produced by gasification of solid or liquid fossil fuels |
| 01/20/1981 | CA1094138A1 Method and apparatus for melting machining chips |
| 01/20/1981 | CA1093822A1 Treatment of coke oven gas |
| 01/13/1981 | US4244732 Manufacture of steel from ores containing high phosphorous and other undesirable constituents |
| 01/13/1981 | US4244180 Process for producing fuel gases from carbonaceous material |
| 01/07/1981 | EP0022098A1 Apparatus for reducing finely divided iron oxide material |
| 01/07/1981 | EP0022050A1 Process and apparatus for the continuous reduction of iron ore |
| 01/07/1981 | EP0021601A1 Process for regenerating a reducing gas mixture from spent gas evolved in the production of sponge iron |
| 01/07/1981 | EP0021465A1 Process for briquetting a material containing sponge iron |
| 01/06/1981 | CA1092810A1 Melting of fine particulate material in a high-speed rotary furnace |
| 12/30/1980 | US4242125 Carbothermic process for producing sponge iron and the improved vertical retort system used in said process |
| 12/23/1980 | CA1091933A1 Method for the continuous smelting of high-purity steel |
| 12/16/1980 | US4239537 And ferro dolime, roasting alkaline earth compound and iron compound |
| 12/16/1980 | US4239530 Process for producing metallized iron pellets |
| 12/11/1980 | WO1980002652A1 Apparatus for reducing finely divided iron oxide material |
| 12/09/1980 | US4238226 Method for producing molten iron by submerged combustion |
| 12/09/1980 | US4238225 Method of monitoring conversion of iron ore into high content pellets |
| 12/09/1980 | US4238222 Waelz process of volatilizing zinc and lead from iron oxide-containing materials |
| 12/02/1980 | US4236699 Apparatus for wet-post treatment of metallized iron ore |
| 11/26/1980 | EP0019362A1 Method and apparatus for the treatment of matter with low temperature plasma |
| 11/25/1980 | US4235624 Method for processing coke oven gas |
| 11/25/1980 | US4235425 Impact bed gasifier-melter |
| 11/18/1980 | US4234169 Apparatus for the direct reduction of iron and production of fuel gas using gas from coal |
| 11/18/1980 | CA1089649A1 Reduction of metal oxides to sponge metal |
| 10/29/1980 | EP0018235A1 Production of reducing gas for furnace injection |
| 10/29/1980 | EP0018184A1 An integrated process for the thermal cracking of a heavy oil and the reduction of an iron ore |
| 10/28/1980 | CA1088315A1 Shaft-furnace direct-reduction process for producing highly reduced iron-bearing material |
| 10/07/1980 | CA1086956A1 Method and apparatus for gaseous reduction of metal ores |
| 10/02/1980 | WO1980002034A1 Manufacture of steel from iron ores |
| 09/30/1980 | US4225340 Method for the direct reduction of iron using gas from coal |
| 09/23/1980 | US4224057 Method for carburizing sponge iron |
| 09/23/1980 | US4224056 Direct reduction process for iron ores with fluidized bed system |
| 09/23/1980 | US4223876 Apparatus for direct recovery of metal from metal-bearing ores |
| 09/23/1980 | US4223874 Shaft furnace for producing low-oxygen iron-base metallic powder for powder metallurgy |
| 09/16/1980 | CA1085621A1 Shaft furnace design |
| 09/09/1980 | US4221366 Gas distributing closure plug for metallurgical reactor |
| 09/09/1980 | CA1085108A1 Binder composition |
| 09/04/1980 | WO1980001808A1 Direct reduction of iron oxide containing material with biofuel |
| 09/02/1980 | US4220469 Combustion of coal-water suspension, mixing with reduction furnace waste gases, quenching slag, scrubbing, reduction |
| 08/20/1980 | EP0014274A1 Process for producing steel |
| 08/12/1980 | CA1083327A1 Method of removing nitrogen oxides from an exhaust |
| 08/05/1980 | US4216011 Method and apparatus for the secondary gaseous reduction of metal ores |
| 07/29/1980 | US4214736 Arc heater melting system |
| 07/29/1980 | US4214707 Trap-port for rotary kilns |
| 07/22/1980 | US4213778 Process for treating a mud produced during gas scrubbing in a blast furnace or a steelworks |
| 07/22/1980 | US4213777 For friction linings |
| 07/22/1980 | CA1081968A1 Method for melting steel |
| 07/22/1980 | CA1081944A1 Shaft furnace for direct reduction of ores |
| 07/15/1980 | US4212452 Apparatus for the direct reduction of iron ore |
| 07/15/1980 | CA1081468A1 Method and apparatus for direct reduction of sulfur-containing iron ore |
| 07/15/1980 | CA1081464A1 Method for generating gases for the reduction of oxide ores, particularly iron ores |
| 06/25/1980 | EP0012363A1 Method of and means for reducing ores |
| 06/24/1980 | US4209322 Pelletization, reduction |
| 06/24/1980 | US4209292 Fluid storage and distribution arrangement mounted on rotary reactor |
| 06/17/1980 | US4208181 Liquid metering and distribution arrangement for rotary reactor |
| 06/10/1980 | US4207093 High speed reaction using turbulent stream of reducing gas |
| 06/10/1980 | CA1079094A1 Making iron powder having fiber-like particles |
| 06/03/1980 | US4205831 Ore reduction reactor discharge regulator |
| 06/03/1980 | US4205830 Apparatus for the direct reduction of iron using gas from coal |
| 06/03/1980 | CA1078622A1 Method for reduction in a fluid bed of fine grained material containing iron oxide |
| 05/20/1980 | US4203761 Process of smelting with submerged burner |
| 05/20/1980 | US4203760 Method for producing steel from sponge metal by using a gas plasma |
| 05/20/1980 | CA1077723A1 Method of producing a partially reduced product |
| 05/14/1980 | EP0010647A1 Method and apparatus for producing steel from iron ore powder by direct reduction |
| 05/14/1980 | EP0010627A1 Method and apparatus for making liquid pig iron and reducing gas in a smelting down and gasification vessel |
| 05/13/1980 | US4202534 Method and apparatus for producing metallized iron ore |
| 05/13/1980 | CA1077278A1 Method for the batchwise reduction of metal ores |
| 05/06/1980 | US4201571 Method for the direct reduction of iron and production of fuel gas using gas from coal |
| 04/22/1980 | US4199545 Fluid-wall reactor for high temperature chemical reaction processes |
| 04/22/1980 | US4199349 Production of sponge iron |
| 04/22/1980 | CA1075913A1 Method and apparatus for producing metallic iron particles |
| 04/08/1980 | US4196893 Shaft furnace |
| 04/08/1980 | US4196891 Briquet strip breaker |
| 04/01/1980 | US4195821 Apparatus for reducing particulate iron oxide to molten iron with solid reductant |
| 03/25/1980 | CA1074124A1 Sponge iron production process |
| 03/18/1980 | US4193554 Method and apparatus for the drying and fine-grinding of coal |
| 03/18/1980 | CA1073670A1 Method and apparatus for cooling particulate material |
| 03/04/1980 | US4191556 Process for reducing metal oxides to metal |
| 02/20/1980 | EP0008140A1 Process for the direct reduction of materials containing iron oxide |
| 02/19/1980 | US4189313 Converting iron ore to sponge iron |
| 02/19/1980 | US4189312 Mixing iron ore and coal |
| 02/19/1980 | CA1071864A1 Shaft furnace with bottom discharge device |
| 02/12/1980 | US4188184 Continuous processes and equipment for treatment of solid substances |
| 02/12/1980 | US4188022 Hot discharge direct reduction furnace |
| 02/12/1980 | CA1071402A1 Process for the treatment of coke-oven gas |
| 02/06/1980 | EP0007662A1 Removal of zinc and lead from materials containing iron oxide by the rotary-kiln volatilizing process |
| 02/05/1980 | CA1070954A1 Method of reducing finely grained material containing iron oxides in a fluid bed |
| 01/08/1980 | CA1069313A1 Process for the direct reduction of iron oxide-containing materials in a rotary kiln |