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| Number | Title | Issue Date |
| 7780759 | Direct reduction process A direct reduction process for a solid metalliferous material having a particle size distribution that at least in part contains micron sized particles includes supplying the metalliferous material, a solid carbonaceous material, an oxygen-containing gas, and a flui... | 08/24/2010 |
| 7044996 | Method for reducing build-up on a roasting furnace grate The present invention relates to method, which helps to reduce and remove the build-up forming on the grate of a fluidized-bed furnace in the roasting of fine-grained material such as concentrate. The concentrate is fed into the roaster from the wall of the furnace,... | 05/16/2006 |
| 6926752 | Method for the stabilization of a fluidized bed in a roasting furnace This invention relates to a method for stabilizing a fluidized bed used in roasting by adjusting the oxygen content of the roasting gas in the bed. The fine-grained material for roasting is fed into the furnace above the fluidized bed and the roasting gas, which cau... | 08/09/2005 |
| 6923843 | Method for oxygen injection in metallurgical process requiring variable oxygen feed rate A method of processing molten metal by the injection of oxygen through a water cooled supersonic oxygen injection lance. In the first step of the process, oxygen is injected through the injection lance at an initial flowrate to the process which is the optimal flowr... | 08/02/2005 |
| 6860919 | Recovery of precious metal from sulphide minerals by bioleaching A method of recovering a precious metal from a sulphide mineral slurry which contains the precious metal which includes the steps of subjecting the slurry to a bioleaching process, supplying a feed gas which contains in excess of 21% oxygen by volume to the slurry, ... | 03/01/2005 |
| 6607577 | Desulphurization reagent control method and system A method and computer program for determining the amounts of desulphurizing reagents required to reduce the sulphur content in hot metal to meet a specified aim concentration. The determination of the amounts of reagents is based on a multivariate statist... | 08/19/2003 |
| 6503292 | Molten metal treatment furnace with level control and method A molten metal treatment furnace (10) with metal treatment and level control includes a heating chamber (12) for containing and heating a supply of molten metal (60), a pump (22) connected to the heating chamber (12), a molten metal treatment chamber (16,... | 01/07/2003 |
| 6500228 | Molten metal dosing furnace with metal treatment and level control and method A dosing furnace (10) with metal treatment and level control includes a holding chamber (12) for containing a supply of molten metal (50), a pump (22) connected to the holding chamber (12), a molten metal treatment chamber (16, 18) located at an outlet (2... | 12/31/2002 |
| 6454829 | Method and device for the continuous degassing of molten metals The invention relates to a method and a device for the continuous degassing of molten metals and subsequent casting of the degassed metal, according to which the molten metal is guided into a vacuum for the purpose of degasification and after degasificati... | 09/24/2002 |
| 6270550 | Method for direct reduction of iron bearing pellets or lump iron ore A method for effecting direct reduction of iron oxides in the form of lumps or pellets, in which an ore burden is passed downwardly successively through prereduction and metallization zones of a shaft furnace while passing a flow of rich fuel gas produced... | 08/07/2001 |
| 6264716 | Process for controlling the stirring energy delivered by a gas flowing through a liquid A process for stirring molten steel in a container. In this process, argon gas is introduced into the container at a flow rate of from about 0.005 to about 0.2 cubic feet of argon per ton of molten steel per minute, the extent to which said container is c... | 07/24/2001 |
| 6231638 | Process for producing metal from metal ores The invention concerns a process for producing metal from metal ores, in particular crude or pig iron from iron ore, wherein the ore which contains metal oxides is brought into contact with a reducing gas which contains carbon and/or hydrogen from solid, ... | 05/15/2001 |
| 6171364 | Method for stable operation of a smelter reactor A process of producing molten iron involves: a) introducing iron oxide, flux, oxygen, nitrogen, carbon, and hydrogen to a smelter reactor; b) maintaining conditions to cause (i) the iron oxide to be reduced, (ii) molten iron to be created and stirred in the bo... | 01/09/2001 |
| 6093235 | Process for decarbonising a high-chromium steel melt A process for decarburizing a steel melt for the production of high-chromium steels by blowing in oxygen in which the decarburization rate is continuously measured and the amount of oxygen to be injected is adjusted depending on the measured values. The f... | 07/25/2000 |
| 6004504 | Method and apparatus for controlling bath level and measurement of bath characteristics A method and apparatus for improved control of continuous electric arc furnace steelmaking in which a charge velocity detector measures charge velocity of metallic charge introduced to the furnace. A charge mass detector measures a charge mass of metallic... | 12/21/1999 |
| 5902371 | Melt shop scheduling for continuous casting In a melt shop for melting scrap to make steel, increased tonnage output for continuous casting for a given primary melt capacity can be obtained by stacking heated ladles of molten steel in inventory at a holding station before the ladles are transferred... | 05/11/1999 |
| 5897684 | Basic oxygen process with iron oxide pellet addition A BOF process in which iron oxide units are added to the melt during the blow characterized in that the oxygen flow is reduced during pellet feeding and is replenished with inert gas so that the total gas flow remains the same as that designed to achieve ... | 04/27/1999 |
| 5885323 | Foamy slag process using multi-circuit lance A method of improving post-combustion heat recovery in a vessel containing a charge of molten ferrous metal and slag includes the use of a lance for the introduction of oxygen gas into the charge. The method includes blowing oxygen into the charge through... | 03/23/1999 |
| 5746804 | Apparatus for melting fine particles containing carbon and method for melting such fine particles using the apparatus An apparatus for and a method of melting fine particles containing carbon, capable of uniformly burning and melting the fine particles throughout the entire zone of the combustion flame. The apparatus includes a triple tube structure including an inner ox... | 05/05/1998 |
| 5694480 | Molten slag flow rate measuring device and furnace facilities using the same Vortex melting furnace facilities picks up an image of molten slag flow in a direction traverse to the molten slag flow discharged from the furnace, calculates a molten slag flow rate by brilliance discrimination of the image pick-up signal and controls a... | 12/02/1997 |
| 5616166 | Tapping method for blast furnace In tapping method in which molten iron (16) and molten slag (18) are discharged from a blast furnace, a conducting pipe (30) is connected to the external side of a molten iron taphole (12), and an electromagnetic energy supply body (32) is disposed around... | 04/01/1997 |
| 5584909 | Controlled foamy slag process A method of improving the post-combustion heat recovery in a basic oxygen furnace by controllably forming a foamy slag. The foamy slag is generated by increasing the lance height and reducing the rate of lance height reduction during the oxygen blowing cy... | 12/17/1996 |
| 5516356 | Process and apparatus for feeding a second stream of pulverulent materials into a pneumatic conveying line carrying a first controllable flow of pulverulent materials A process for feeding a second stream of pulverulent materials into a pneumatic conveying line carrying a first controllable flow of pulverulent materials is presented. The second stream of pulverulent materials is fed at a controlled rate and the control... | 05/14/1996 |
| 5511766 | Filtration device A vessel used for transfer of molten metal having a refractory filter wall with filters for removing inclusion from molten metal as it flows through the vessel. The refractory filter wall having passages sized according to a predetermined volume of molten... | 04/30/1996 |
| 5507854 | Method and apparatus for measuring displacement of molten metal First and second electrodes are inserted into molten metal. A first pseudo random signal is transmitted to the first electrode, and at the same time the first pseudo random signal and a second pseudo random signal which has the same pattern as the first p... | 04/16/1996 |
| 5500033 | Melt heating method A method of heating a melt containing an oxidizable substance in which a fuel is burned with an oxidant by projecting fuel oxidant jets over the melt. The fuel and the oxidant jets have a fuel jet momentum and an oxidant jet momentum, respectively. The ox... | 03/19/1996 |
| 5447550 | Method and apparatus for the pneumatic transport of iron-bearing particles Methods and systems are provided for controlling the pneumatic transport of friable particulate solid material through a transport pipe by means of a carrier gas circulating in a loop comprising the transport pipe and a carrier gas recycle conduit. A valu... | 09/05/1995 |
| 5246482 | Molten metal producing and refining method The disclosure relates to a molten metal producing and refining method which does not damage the apparatus, realizes a stable and high second combustion rate, and is capable of effectively recovering heat generated by the second combustion. The method com... | 09/21/1993 |
| 5229063 | Process for the treatment of steel-mill slag and apparatus for carrying it out The present invention provides a new process and a new apparatus for the treatment of steel-mill slag in a vessel which allows a wet granulation of the slag without the risk of explosions. The slag is caused to flow through a taphole at the bottom of the ... | 07/20/1993 |
| 5226950 | Liquid-in-liquid sensor and method The present invention includes process and apparatus for continuously monitoring or detecting a liquid element or compound in another, different liquid including introducing a gas into a first liquid, measuring bubble size of bubble formation of the gas i... | 07/13/1993 |
| 5196050 | Control method of and apparatus for material charging at a top of a blast furnace In a control method of material dumping at top of a blast furnace, in which material stored in a furnace top bunker is dumped through a flow rate control gate into a blast furnace in a specified time, value of initial material weight before the transfer s... | 03/23/1993 |
| 5188661 | Dual port lance and method A apparatus is disclosed which is utilized for treatment of molten metal contained in a vessel by injection of powdered reagent below the surface of the molten metal which includes an elongated lance body containing longitudinal conduits for delivery of t... | 02/23/1993 |
| 4983214 | Method and apparatus for direct reduction of metal oxides A method and apparatus is disclosed for direct reduction of metal oxides, using a rotary kiln, fed with greenball pellets, the kiln having a feed-end and a discharge end. A first chamber within the kiln, and adjacent to the feed-end, is used for drying, p... | 01/08/1991 |
| 4976780 | Blast furnace operation management method and apparatus Inference is carried out through intermediate hypotheses representing physical states of a blast furnace using HG (Heuristic Grade) in order to comprehensively diagnose the state of the furnace to ascertain optimum actions. Specific parameters are monitor... | 12/11/1990 |
| 4963186 | Method for operating blast furnace by adding solid reducing agent Disclosed herein is a method for operating blast furnace, wherein, when charging coke and ore alternately from the furnace top to form alternate coke and ore layers for operation of a blast furnace, a coke layer is formed by charging coke of properties es... | 10/16/1990 |
| 4891062 | Method for operating and melt-down gasifier having water-cooled nozzles for oxygen and means for monitoring water and oxygen Described is a method for operating a melt-down gasifier(4) in which iron-ore-containing charge materials or iron sponge obtained from same by direct reduction are smelted due to the addition of carbon carriers and blowing an oxygen-containing gas through... | 01/02/1990 |
| 4756880 | Radiant heat vaporizing injector An apparatus and method for injecting magnesium into molten iron. The magnesium is melted and vaporized in an enclosed container located above and heated by the molten iron. The magnesium vapor is then pumped into the molten iron by its own vapor pressure... | 07/12/1988 |
| 4634559 | Fluid flow control process A method is disclosed for controlling flow rates of a primary fluid including aspirating, mixing, and metering the primary fluid with a secondary fluid. The secondary fluid has a high relative vapor pressure to form a gaseous mixture consisting essentiall... | 01/06/1987 |
| 4511399 | Control method for large scale batch reduction of zirconium tetrachloride This is a control method for large scale batch reduction of zirconium tetrachloride to zirconium metal. Solid zirconium tetrachloride is fed at least periodically into a sublimer and the sublimer heated to vaporize the zirconium tetrachloride. The vaporiz... | 04/16/1985 |
| 4264059 | Condition responsive control means for use in discharging powdered reagent into a pool of molten metal For use in a system for injecting powdered reagent into a pool of molten metal through a lance whose discharge end is submerged in molten metal and to which powdered reagent is conveyed by a flow of carrier gas, sensing means is arranged to derive a signa... | 04/28/1981 |
