| Patents for C21B 13 - Making spongy iron or liquid steel, by direct processes (6,991) |
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| 12/15/1987 | CA1230230A1 Method for reducing oxidic iron ores in rotary tubular kilns |
| 12/03/1987 | DE3625208C1 Process for the direct reduction of iron ores using a natural gas with contents of butane or higher hydrocarbons, and equipment therefor |
| 12/03/1987 | DE3625207C1 Process for the direct reduction of iron ores and equipment therefor |
| 11/24/1987 | US4708736 Method of producing molten pig iron or steel pre-products from particulate ferrous material |
| 11/24/1987 | US4708640 Apparatus for batch preparation and feeding into the smelting process |
| 11/17/1987 | US4706943 Connection device for plasma generators |
| 11/12/1987 | DE3712846A1 Verbessertes verfahren zur herstellung metallisierter pellets Improved process for the production of metallized pellets |
| 11/11/1987 | EP0244551A1 Integrated metallurgical plant |
| 11/10/1987 | US4705563 Methods and apparatus for reducing corrosion in refractory linings |
| 11/10/1987 | US4705474 Method and apparatus for batch preparation and feeding into the smelting process |
| 11/10/1987 | US4705466 Method and apparatus for producing rolled product from metal droplets |
| 10/27/1987 | US4702766 Method of increasing carbon content of direct reduced iron and apparatus |
| 10/27/1987 | CA1228482A1 Reduction of metal compounds |
| 10/21/1987 | EP0241732A2 Method and apparatus for producing hot direct reduced iron |
| 10/20/1987 | US4701217 Smelting reduction |
| 10/20/1987 | US4701214 Prereducing agglomerated ore and carbonaceous reducing agent |
| 10/20/1987 | US4701213 Reduction of iron ore concentrates with magnesium or aluminum |
| 10/20/1987 | CA1228234A1 Process and an arrangement for producing molten pig iron or steel pre-products |
| 10/13/1987 | US4699655 Using coal fluidized bed |
| 10/13/1987 | US4699361 Shaft furnace arrangement for the direct reduction of iron ores |
| 10/07/1987 | EP0240485A1 Installation for producing steel from scrap |
| 10/06/1987 | US4698219 Multistage carbonation of calcium oxide and calcium sulfide |
| 09/29/1987 | US4697274 Electric melting furnace arrangement as well as a method of influencing the composition of a mineral melt for producing wool |
| 09/24/1987 | WO1987005634A1 Process and device for melt gasification |
| 09/23/1987 | EP0237852A1 Process and installation for the continuous remelting of scrap |
| 09/23/1987 | EP0237811A2 Method of reducing iron oxides in two steps |
| 09/23/1987 | CN87102144A Process and apparatus for directly reducing iron to produce heat |
| 09/16/1987 | EP0236802A2 Iron ore melt reduction process |
| 09/16/1987 | EP0236801A2 Method for producing iron |
| 09/16/1987 | EP0236669A1 Method for producing molten pig iron or steel pre-material |
| 09/16/1987 | CN87102252A Fusion reduction of iron ore |
| 09/16/1987 | CN87101937A Method of manufacturing iron |
| 09/10/1987 | DE3607222A1 Process for reducing iron ore to steel |
| 09/08/1987 | US4692353 Coating and impregnating with wax |
| 09/02/1987 | CN86100818A Low temp. smelting technique for pyrite |
| 08/26/1987 | EP0233404A1 Method and plant for continuous production of steel from ore |
| 08/26/1987 | CN87102333A One-step steelmaking process |
| 08/18/1987 | US4687564 Refractory lining for electrochemical cell |
| 08/18/1987 | US4687183 Apparatus for the production of liquid iron from iron oxide |
| 08/13/1987 | DE3603948A1 Arc reduction furnace or arc residue-reduction furnace, in particular for the INRED process |
| 08/12/1987 | EP0232246A2 Process for manufacturing iron powder suitable for powder metallurgy by means of reduction of fine iron oxide powders with hot gases |
| 08/11/1987 | US4685964 Method and apparatus for producing molten iron using coal |
| 08/04/1987 | CA1224920A1 Rotary kiln for use in reduction-smelting ores of oxides of iron group elements and smelting method thereof |
| 07/21/1987 | CA1224337A1 Method of reducing iron ore |
| 07/21/1987 | CA1224336A1 Process of producing liquid carbon-containing iron |
| 07/16/1987 | DE3600472A1 Method of smelting pig iron |
| 07/16/1987 | DE3600347A1 Device for influencing the distribution of the burden situated in an electric furnace, in particular reduction furnace |
| 07/15/1987 | CN86104943A Process for reduction smelting iron ore |
| 07/14/1987 | US4680009 Apparatus for removing oversize from the hot material discharged from a rotary kiln used to produce sponge iron by a direct reduction of iron oxide containing materials |
| 07/08/1987 | EP0228039A2 Method and apparatus for transferring heat to molten metal |
| 07/08/1987 | CN86105494A Direct refining and rolling of steel by pre-reduction of ore with lignite |
| 07/08/1987 | CN85104511A Arrangement comprising gasifier and direct reduction furnace |
| 07/07/1987 | US4678508 Method for fluidized bed reduction of iron ore |
| 07/07/1987 | CA1223740A1 Method for the production of iron |
| 07/02/1987 | DE3608150C1 Verfahren und Vorrichtung zur reduzierenden Schmelzvergasung Method and apparatus for reducing gassing |
| 07/02/1987 | DE3546261A1 Reduction of ores, with simultaneous gas generation |
| 06/30/1987 | US4676824 Process for generating heat and producing sponge iron |
| 06/30/1987 | US4676741 Radiantly heated furnace |
| 06/30/1987 | US4676486 Preventing attack of refractory containment by slag |
| 06/24/1987 | CN85109186A Direct reducing kiln |
| 06/19/1987 | DE3544287A1 Process for obtaining iron from roasted pyrites (burnt ore) and similar materials, and apparatus for performing this process |
| 06/16/1987 | US4673432 Process for the production of pig iron |
| 05/26/1987 | US4668284 Method of reducing iron ore |
| 05/13/1987 | CN86105093A Method for producing raw iron from iron concentrates and for the manufacture of gas, and plant apparatus for carrying out the method |
| 05/12/1987 | US4664701 Method and plant for fully continuous production of steel strip from ore |
| 04/28/1987 | US4661150 Electric melter for sponge iron |
| 04/23/1987 | DE3536134A1 Apparatus for transferring powdery substances from a delivery container to a receiving container without access of air |
| 04/08/1987 | EP0217331A2 Process for producing pig iron from finely divided ores |
| 04/07/1987 | US4655146 Reaction apparatus and method |
| 04/01/1987 | CN86106723A Method and apparatus for products molten iron using coal |
| 04/01/1987 | CN86105271A Process for mfr. of iron by melting-reducing iron ores |
| 03/31/1987 | US4654076 Smelting |
| 03/25/1987 | EP0215721A1 Process and device for the repair of an overheated gas conduit lining by a plasma torch |
| 03/18/1987 | CN85106482A Reforming of higher hydrocarbons |
| 03/04/1987 | CN85106200A Direct reduction method for ferric oxide in material |
| 02/24/1987 | US4645184 Apparatus for preparing binder-free hot-briquets |
| 02/10/1987 | US4642133 Removal of impurities using magnesium chloride |
| 02/04/1987 | EP0210658A1 Apparatus for screening oversized hot sponge iron produced in a rotary kiln in the gaseous reduction of iron ore |
| 02/04/1987 | EP0210435A2 Process for cooling and cleaning generator gas and furnace gas, and apparatus for carrying out this process |
| 02/04/1987 | CN86104420A Process for cooling and cleaning producer gas and blast furnace gas and apparatus for performing this process |
| 01/29/1987 | WO1987000554A1 A method for producing raw iron from iron concentrates and for the manufacture of gas, and plant apparatus for carrying out the method |
| 01/28/1987 | EP0210151A1 A method for producing raw iron from iron concentrates and for the manufacture of gas, and plant apparatus for carrying out the method |
| 01/28/1987 | EP0209861A2 Melt-reductive iron making method from iron ore |
| 01/27/1987 | CA1217059A1 Production of liquid iron |
| 01/21/1987 | EP0209149A1 Method for melt-reducing iron ore |
| 01/20/1987 | US4638487 Shroud for arc furnace |
| 01/20/1987 | CA1216754A1 Process of making steel by melting sponge iron in an electric arc furnace |
| 01/13/1987 | US4636127 Conveying screw for furnace |
| 01/08/1987 | DE3621323A1 Process for producing steel in an electric arc furnace |
| 01/07/1987 | EP0207779A2 Direct reduction process using shaft furnace |
| 12/30/1986 | CA1215842A1 Process and installation for the direct production of sponge iron particles and liquid crude iron from iron ore in lump form |
| 12/24/1986 | CN86104384A Manufacture of steel in d.c.furnace |
| 12/17/1986 | CN85104824A Process of producing sponge iron |
| 12/16/1986 | US4628834 Vibratory fluidized bed reactor |
| 12/10/1986 | EP0204684A1 Process for the direct reduction of particulate material containing iron oxide |
| 12/09/1986 | CA1214940A1 Process for production of low phosphorus alloy |
| 12/02/1986 | US4626654 Metallurgical plasma melting process |
| 12/02/1986 | CA1214793A1 Method of protecting a coal gasifier part from attack by liquid slags |
| 11/26/1986 | CN85104051A Process of thermally treating lump or agglomerated materials on a moving grate |
| 11/25/1986 | CA1214333A1 Method and a melt-down gasifier for producing molten pig iron or steel pre-products |