| Patents for C21B 13 - Making spongy iron or liquid steel, by direct processes (6,991) |
|---|
| 03/19/1991 | US5000784 Method for smelting reduction of iron ore |
| 03/13/1991 | CN1011981B Process for continuously melting of steel |
| 03/07/1991 | DE3928415A1 Steel mfr. using direct redn. chamber - with heating tube system fed with combusted top gas and melting furnace off-gas |
| 03/06/1991 | CN1011894B Method and equipment for producing iron alloy |
| 03/06/1991 | CN1011893B Process for direct reduction of iron oxide containing materials in rotary kiln |
| 03/01/1991 | CA2024184A1 Method of in-bath smelting reduction of metals and in-bath smelting reduction furnace |
| 02/27/1991 | EP0413894A1 Pneumatic steelmaking vessel and method of producing steel |
| 02/26/1991 | US4996694 Method and apparatus for melting iron and steel scrap |
| 02/26/1991 | US4995906 Method for smelting reduction of iron ore |
| 02/26/1991 | US4995904 Method for the pretreatment of a lumpy carbon carrier |
| 02/19/1991 | US4995051 Smelting furnace and method for feeding material to be processed therein |
| 02/19/1991 | US4993689 Convertor for continuously melting scrap with tapping means |
| 01/30/1991 | CN1011418B Process for cooling and cleaning producer gas and blast furnace gas and apparatus for performing this process |
| 01/29/1991 | US4988079 Apparatus for smelting and reducing iron ores |
| 01/23/1991 | CN1011339B Charging material preheater for preheating charging material of metallurgical smelting unit |
| 01/16/1991 | EP0408159A1 Apparatus and process for direct reduction of materials in a kiln |
| 01/15/1991 | US4985075 Method for manufacturing chromium-bearing pig iron |
| 01/14/1991 | CA2014189A1 Apparatus and process for direct reduction of materials in a kiln |
| 01/09/1991 | CN1011143B Metallurgical composites and processes |
| 01/02/1991 | CA1278430C Process and apparatus for producing sponge iron or pig iron |
| 12/26/1990 | CN1010955B Process and apparatus for directly reducing iron to produce heat |
| 12/18/1990 | US4978387 Process for the production of molten pig iron |
| 12/18/1990 | US4978106 Iron reduction apparatus |
| 12/13/1990 | WO1990015162A1 Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 12/13/1990 | CA2047188A1 Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 12/12/1990 | CN1047701A Pre-heating and pre-reduction of metal oxide ore using high temperature off-gases |
| 12/11/1990 | US4976776 Preheating and prereducing using recirculated hot gases; energy efficient |
| 11/21/1990 | CN1047109A Process for smelting reduction of cr materials, and smelting reduction furnace therefor |
| 11/07/1990 | CN1010325B Process and apparatus for recovering metal and metal alloy |
| 11/07/1990 | CN1010323B Process and arrangement for gaining electric energy in addition to producing molten pig iron |
| 10/24/1990 | EP0394214A1 Plants to be used for metallurgical treatments of metals, metal compounds and/or metal alloys or for producing calcium carbide |
| 10/23/1990 | CA1275358C Process for the gasification of sewage sludge |
| 10/13/1990 | CA2013780A1 Plant to be used for metallurgical treatments of metal compounds and/or metal alloys for producing calcium carbide |
| 10/09/1990 | US4961784 Blowing inert gas from bottom and side and oxygen from top to decarburize reduced ores |
| 09/27/1990 | DE3919715C1 Cyclone heat exchanger for powders - has tapered outlet connected to enlarged second with sloping part, opening into discharge pipe |
| 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 |
| 09/19/1990 | EP0388395A1 Process for producing combustible gases in a melting gasifier |
| 09/19/1990 | CN1045423A Method for smelting reduction of ni ore |
| 09/18/1990 | US4957722 Production of partially calcined carbonaceous reductant using steam |
| 09/18/1990 | US4957547 Process for continuously melting of steel |
| 09/18/1990 | US4957546 Refining iron and steel |
| 09/18/1990 | US4957545 Smelting reduction process using reducing gas generated in precombustor |
| 09/13/1990 | DE3934023C1 Device for melting of pig iron - and impellent prepn. from coal and ore |
| 09/12/1990 | EP0386407A2 Method for smelting reduction of Ni ore |
| 09/12/1990 | CN1009561B Process for mfr. of iron by melting-reducing iron ores |
| 09/11/1990 | US4955587 Arrangement for recovering molten pig iron or steel pre-products from lumpy iron-oxide containing charging substances |
| 09/05/1990 | CN1045127A Improvements in or relating to pre-reduced iron oxide |
| 08/29/1990 | EP0384397A1 Method for manufacturing molten metal containing Ni and Cr |
| 08/29/1990 | EP0384395A2 Method for smelting reduction of Ni ore |
| 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 |
| 08/17/1990 | WO1990009423A1 Process for producing combustible gases in a melt-down gasifier |
| 08/17/1990 | CA2027350A1 Process for producing combustible gases in a melt-down gasifier |
| 08/07/1990 | US4946498 Process for the production of steel from fine ore hot briquetted after fluidized bed reduction |
| 07/31/1990 | US4944799 Method of producing stainless molten steel by smelting reduction |
| 07/27/1990 | WO1990008843A1 Direct smelting process |
| 07/18/1990 | EP0377636A1 Congeneration process for production of energy and iron materials, including steel |
| 07/12/1990 | DE3905058C1 Apparatus and process for smelting pig iron and for producing useful gas from fine ore and coal screenings (small coal) |
| 07/11/1990 | CN1008745B Method for producing thermal sponge iron |
| 07/10/1990 | US4940488 Method of smelting reduction of ores containing metal oxides |
| 06/28/1990 | WO1990007010A1 Manufacture of iron and steel in a duplex smelter and solid state oxide suspension prereducer |
| 06/27/1990 | CN1043344A Process and apparatus for reduction of molten iron ore |
| 06/27/1990 | CN1008540B Direct reducing kiln |
| 06/26/1990 | US4936908 Preheating and prereducing ores with process gases from smelting furnace; efficiency |
| 06/19/1990 | US4935054 Through a chute to mouth of furnace |
| 06/05/1990 | US4931090 Pneumatic steelmaking vessel and method of producing steel |
| 05/29/1990 | CA1269688A1 Control device for plasma generators |
| 05/16/1990 | EP0368835A1 Process for the production of molten pig iron and plant for carrying out the process |
| 05/16/1990 | CN1042185A Process and apparatus for making molten iron |
| 05/15/1990 | US4925489 Slags; coal-free; reduced oxygen flow |
| 05/08/1990 | CA1268633A1 Method of producing molten pig iron or steel pre- products from particulate ferrous material |
| 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 |
| 04/24/1990 | US4919396 Apparatus for smelting meltable substances, particularly ore concentrates |
| 04/10/1990 | US4915731 Metallurgical method and apparatus |
| 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 |
| 04/03/1990 | US4913732 Feeding powdered ore and reducing agent to area of electric arc; blowing inert gas to stir |
| 03/22/1990 | DE3831838A1 Process for the utilisation of steel works filter dust and similar material |
| 03/21/1990 | EP0358711A1 Plasma fired feed nozzle. |
| 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 |
| 02/28/1990 | EP0355163A1 Process for producing molten stainless steel |
| 02/28/1990 | CN1040058A Process for utlizing rich iron but poor manganese ore |
| 02/14/1990 | CN1039620A Method for smelting molten iron directly from powdered coal and tiron ore |
| 02/13/1990 | US4900356 Process and apparatus for producing metallized pellets and scrubbing spent reducing gas |
| 02/07/1990 | EP0353541A2 A method of recycling steel belted tires |
| 02/07/1990 | CN1039447A Process for heating steel melts as well as device for performing this process |
| 02/07/1990 | CN1006721B Cold-concreted pellets used directly for steel-and-iron-smelting |
| 02/06/1990 | US4898366 Apparatus for charging a melting gasifier with gasification media and sponge iron |
| 01/30/1990 | US4897179 Method of producing reduced iron and light oil from ion ore and heavy oil |
| 01/30/1990 | US4897113 Direct reduction process in reactor with hot discharge |
| 01/30/1990 | US4896810 Apparatus for melting scrap |
| 01/23/1990 | US4895594 Or pig iron, sub-stoichiometric burners, combustion, discharging, ladles, tapholes, preferential, rotation |
| 01/23/1990 | US4895593 Process of recovering molten pig iron or steel pre-products from lumpy iron-oxide and scrap using a fluidized bed |
| 01/03/1990 | EP0349167A2 Method of desulfurizing molten metal in a plasma fired cupola |
| 01/02/1990 | US4891062 Prevention of damage |
| 01/02/1990 | US4890821 Metallurgical processes |
| 12/26/1989 | US4889556 Method of recycling steel belted tires |