| Patents for C21B 13 - Making spongy iron or liquid steel, by direct processes (6,991) |
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| 02/21/1989 | US4806158 Process of reducing fine-grained iron-containing material by means of solid carbonaceous reducing agents |
| 02/21/1989 | US4806154 Process for the production of pig iron from fine ore using plasma burner |
| 02/21/1989 | US4805880 Fluidized bed arrangement for the production of molten pig iron and steel pre-products |
| 02/15/1989 | CN1003307B Process for direct reduction of briquets bound with high molecular substances |
| 02/14/1989 | US4804408 A mill arrangement and a process of operating the same using off gases to refine pig iron |
| 02/14/1989 | US4804319 Process for compacting iron particles and subsequent breaking apart of the compacted iron band |
| 02/08/1989 | EP0302111A1 Method and furnace for making iron-carbon intermediate products for steel production |
| 02/01/1989 | EP0302047A1 Method and apparatus for the production of liquid pig iron or raw materials for steel from granular charging materials containing iron oxide |
| 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 |
| 01/04/1989 | EP0297167A1 Method and apparatus for producing molten metal from powder state ore |
| 01/03/1989 | CA1247864A1 Process for the production of pig iron |
| 12/28/1988 | EP0296616A1 Process for the detoxification of steel plant wastes |
| 12/27/1988 | US4793857 Melt-down gasifier and iron reduction unit |
| 12/27/1988 | US4793856 Reducing iron ore to sponge iron in a shaft reactor; preventing agglomeratin with gases |
| 12/27/1988 | US4793855 Process for the gasification of sewage sludge |
| 12/20/1988 | US4792352 Method for manufacturing steel through smelting reduction |
| 12/14/1988 | CN87103881A Method for manufacturing steel through smelting reduction |
| 12/13/1988 | US4790517 Apparatus for the direct reduction of sulphurous iron ores |
| 11/30/1988 | CN88103135A Cold-concreted pellets used directly for steel-and iron-smelting |
| 11/29/1988 | CA1245462A1 Method and apparatus for batch preparation and feeding into the smelting process |
| 11/23/1988 | EP0291754A2 Process for removal of sulphur from waste gas of a reduction shaft furnace |
| 11/23/1988 | EP0291701A1 Charge preheater for preheating the charge of a metallurgical melting installation |
| 11/23/1988 | CN88102184A Charging material preheater for preheating charging material for a metallurgical smelting unit |
| 11/22/1988 | US4786321 Coal combustion |
| 11/17/1988 | WO1988009109A1 Plasma fired feed nozzle |
| 11/17/1988 | EP0290650A1 Method for manufacturing steel through smelting reduction |
| 11/16/1988 | CN87103111A Novel sponge iron smelting technique and furnace type |
| 11/15/1988 | US4784689 Reduction of iron ore |
| 11/15/1988 | CA1244656A1 Processes and appparatus for the smelting reduction of smeltable materials |
| 11/15/1988 | CA1244653A1 Process of producing sponge iron |
| 11/01/1988 | US4781576 Retractable burner for coal gasification plants |
| 10/25/1988 | US4780135 Process for the detoxification of steel plant wastes |
| 10/25/1988 | US4780132 Producing iron from scrap iron; controlling gas flow rate |
| 10/20/1988 | DE3739344A1 Production of pig iron by reduction of finely granular iron ore by means of carbon carriers and oxygen carriers, and plant for carrying out the process |
| 09/28/1988 | CN87108012A Process and arrangement for gaining electric energy in addition to producing molten pig iron |
| 09/20/1988 | US4772316 Process for the reduction of iron-containing chrome ores |
| 09/20/1988 | CA1242077A1 Process for the direct reduction of iron-oxide- containing materials |
| 09/14/1988 | EP0282321A2 Power generation |
| 09/13/1988 | CA1241833A1 Combined melting gasifier and a direct reduction shaft furnace |
| 09/06/1988 | US4769211 Passibating sponge iron against o2; minimizing metallization losses; homogenizing and precompression separating via rollers; bending to break at set points |
| 09/06/1988 | US4769065 Control of a plasma fired cupola |
| 08/25/1988 | WO1988006190A1 Method and furnace for making iron-carbon intermediate products for steel production |
| 08/24/1988 | CN87101210A Direct smelting of steel from iron ore |
| 08/23/1988 | US4766098 Method of protecting a coal gasifier part from attack by liquid slags |
| 08/17/1988 | EP0277947A1 Apparatus for producing ferrous or non-ferrous metals from self-fluxing or not, self-reducing agglomerates or ores. |
| 08/16/1988 | US4764210 In electric melter |
| 08/10/1988 | CN87107197A Process and apparatus for recovering metal and metal alloy |
| 08/04/1988 | DE3701571A1 Digestion of raw phosphates even in a fusion gasifier, with addition of scrap and steelworks slag |
| 08/02/1988 | US4761793 For a furnace |
| 07/12/1988 | US4756750 Process for the direct reduction of iron ore |
| 07/12/1988 | US4756748 Processes for the smelting reduction of smeltable materials |
| 07/06/1988 | CN86101817B Process for producing liquid iron and half-finished steel products using granular material containing iron |
| 07/05/1988 | US4755219 Process for producing molten pig iron or steel raw material |
| 06/21/1988 | US4752329 Apparatus and method for increasing carbon content of hot directly reduced iron |
| 06/16/1988 | DE3642103A1 Gasification of domestic refuse, hazardous waste and even highly toxic waste in a fusion gasifier |
| 06/01/1988 | EP0269609A1 A process and an arrangement for gaining electric energy in addition to producing molten pig iron |
| 05/31/1988 | US4747872 Process and apparatus for producing high purity iron |
| 05/24/1988 | CA1236982A1 Reforming of higher hydrocarbons |
| 05/24/1988 | CA1236975A1 Method for producing a carbonaceous solid reductant for direct reduction of iron ore |
| 05/18/1988 | CN87107202A Recovering method and equipment for metal and alloy |
| 05/17/1988 | US4744875 Steel refining with an electrochemical cell |
| 05/11/1988 | EP0266975A1 Smelting reduction |
| 05/11/1988 | EP0124541B1 Processing of metal |
| 05/05/1988 | DE3735966A1 Process for winning metals or metal alloys and also plant for carrying out the process |
| 05/05/1988 | DE3735965A1 Process for winning metals or metal alloys and also plant for carrying out the process |
| 04/27/1988 | CN86107778A Equipment for the production of ferrous or nonferrous metals from self-reduced lumps or ores with self-melting or non-self-melting process |
| 04/26/1988 | US4740989 Plant for producing steel from scrap |
| 04/26/1988 | US4740242 Method for transferring heat to molten metal, and apparatus therefor |
| 04/26/1988 | US4740240 Oxidation, gasification, reduction |
| 04/26/1988 | US4740239 Controlled reduction in rotary kiln |
| 04/21/1988 | WO1988002838A1 Apparatus for producing ferrous or non-ferrous metals from self-fluxing or not, self-reducing agglomerates or ores |
| 04/13/1988 | EP0263119A1 Process and device for melt gasification |
| 04/06/1988 | EP0262353A1 Method for producing hot sponge iron |
| 04/05/1988 | US4735653 Waste gas used for heating, desulfurization; and for producing reducing gas |
| 03/30/1988 | CN87106305A Process of reducing fine-grained iron-coutaining material by means of solid of solid carbonaceous |
| 03/29/1988 | US4734128 Recycled reducing gas and methane to adjust carburization and cooling of sponge iron |
| 03/29/1988 | US4733619 Powder feeder |
| 03/16/1988 | EP0259510A1 Archimedean screw for metallurgical furnaces, in particular for hearth furnaces |
| 03/16/1988 | CN87102213A Method for producing thermal sponge iron |
| 03/09/1988 | EP0258678A2 Process for the production of iron from fine-grained iron ores |
| 03/08/1988 | US4729786 Process for the direct reduction of iron-oxide-containing materials |
| 03/02/1988 | EP0258208A1 Iron and steel plant and process for its operation |
| 03/02/1988 | EP0257173A1 Metallurgical plant and method of operating the same |
| 03/02/1988 | EP0257172A1 Metallurgical plant and method of operating the same |
| 03/01/1988 | US4728360 Fluidized bed of coke particles |
| 02/25/1988 | DE3627037A1 Process and plant meant for producing crude iron |
| 02/17/1988 | CN86101529A Production of liquid iron |
| 02/16/1988 | US4725309 Method and apparatus for producing hot direct reduced iron |
| 02/16/1988 | US4725308 Process for producing molten pig iron or steel pre-products |
| 02/03/1988 | EP0255180A1 Process for the reduction of ferrous fine-grained materials by means of reducing agents containing solid carbon |
| 02/03/1988 | EP0255154A1 Process for the reduction of iron-containing ores in a rotary furnace |
| 01/20/1988 | CN87104326A Process for direct reduction of iron oxide containing materials in rotary kiln |
| 01/19/1988 | US4720299 Method for the direct reduction of particulate iron-oxide-containing material |
| 01/19/1988 | CA1231532A1 Melting furnace operating method and implementation means |
| 12/30/1987 | CN86106417A The furnace continuous steelmaking and the continuity of steelmaking production |
| 12/23/1987 | CN87103786A Method for mfg. chromium-bearing pig iron |
| 12/23/1987 | CN86102198A Technology and equipment for directly deoxy iron-smelting with two-stage cyclone |
| 12/16/1987 | EP0249006A1 Method for manufacturing chromium-bearing pig iron |