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| Number | Title | Issue Date |
| 8142543 | Refining ferroalloys A method of refining a ferroalloy includes the step of blowing molecular oxygen or a gas mixture including molecular oxygen into a melt of the ferroalloy. A metallurgically acceptable particulate material is introduced from above into the melt. The particulate mater... | 03/27/2012 |
| 7371342 | Method for unlocking nozzles of reactors Method intended to unblock enriched air blow or reaction gases nozzles in reactors or fusion converters for mining industry pyrometallurgy CHARACTERIZED by the injection of discrete air impacts with time intervals regulated to high pressure and rate through the enri... | 05/13/2008 |
| 6638337 | Method of introducing additives in steelmaking The additives, in particulate solid form, are conveyed pneumatically in a divergent stream from a pneumatic gun to impinge upon the molten iron and mix therewith. The gun is spaced above a surface of molten iron such that the pneumatically conveyed stream... | 10/28/2003 |
| 6602321 | Direct smelting process A direct smelting process and a fixed, ie non-rotatable, metallurgical vessel for producing metal from a metalliferous feed material is disclosed. The process is a molten bath-based process which includes injecting solid feed materials with a carrier gas ... | 08/05/2003 |
| 6596227 | Machine structure steel superior in chip disposability and mechanical properties and its method of making A machine structure steel superior in chip disposability and mechanical properties which contains sulfide-type inclusions such that those particles of sulfide-type inclusions with major axes not shorter than 5 μm have an average aspect ratio not larger t... | 07/22/2003 |
| 6428603 | Direct smelting process A direct smelting process and a fixed, i.e. non-rotatable, metallurgical vessel for producing metal from a metalliferous feed material is disclosed. The process is a molten bath-based process which includes injecting solid feed materials with a carrier ga... | 08/06/2002 |
| 6395058 | Method of alloying ferrous material with magnesium injection agent A treatment agent and method to introduce magnesium into ferrous material. The treatment agent includes a mixture of high melting temperature particles and magnesium particles. The content of high melting temperature particles in the particle mixture is p... | 05/28/2002 |
| 5931985 | Process and device for blowing oxygen-containing gas with and without solid material on a metal melt in a metallurgical vessel A process for blowing oxygen-containing gas, with and without solid material, on a metal melt in a metallurgical vessel, a process for generating a burner flame and corresponding devices. The inventive process and lance suitable for such process provides,... | 08/03/1999 |
| 5368631 | Desulfurization agent A method for desulfurizing molten pig-iron involving injecting a gas-evolving desulfurization agent which includes a calcium compound and a gas forming material comprising of a gas-producing compound, a slag-forming agent and magnesium.... | 11/29/1994 |
| 5366539 | Process for the desulphurization treatment of pig iron melts The invention relates to a process for the desulphurization treatment of a pig iron melt in a container. The characterizing feature of the invention is that the treatment is performed in three phases: In the initial phase such solids are injected that deoxidiz... | 11/22/1994 |
| 5358550 | Desulfurization agent A method for desulphurizing molten pig-iron involving injecting a gas-evolving desulphurizing agent which includes a calcium compound and a gas-forming material comprising of a liquid gas-producing compound absorbed in a porous slag-forming agent and at l... | 10/25/1994 |
| 5332419 | Pneumatic injection of powder or granule through submerged tuyeres A method of injecting powdered material into converters or other metallurgical vessels equipped with at least one submerged tuyere and a gas flow line interconnecting the tuyere to a bustle pipe or other source for blowing converting gas into the tuyere c... | 07/26/1994 |
| 5298053 | Consumable lance for oxygen injection and desulfurization and method A consumable lance for simultaneously reheating and desulfurization of a molten metal bath includes an internal circuit for delivering oxygen below the slag metal interface and an external circuit for delivering a desulfurizing agent to the slag metal int... | 03/29/1994 |
| 5295669 | Refractory coated iron-based pipe A thermally stable refractory coating for iron-based piping and a method of forming the same is provided. The refractory coating comprises from about 30 to about 35 weight percent sodium silicate; from about 31 to about 36 weight percent course silica, ab... | 03/22/1994 |
| 5201941 | Process for introducing additive substances which are capable of flow into a metallurgical vessel and a vessel for that process For the metallurgical treatment of a molten metal bath (1) in a metallurgical smelting and refining vessel (3), additive substances (43) which are capable of flow, in particular lime, are supplied in a granular to dust state, at least during a part of the... | 04/13/1993 |
| 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 |
| 5019159 | Process and apparatus for the introduction of gas into a discharge opening of a metallurgical container containing molten metal For the procedure a gas, heated to at least 1000 degrees Celsius, preferably even beyond the liquid temperature of the melt, is blown into the discharge opening (26). In this manner freezing problems and deposits in the discharge opening can be largely pr... | 05/28/1991 |
| 4986847 | Process and apparatus for at least temporarily simultaneously subjecting a molten metal to the action of a gas and fine-grain solid materials In a process for at least temporarily simultaneously subjecting a molten metal (5) in a metallurgical vessel (3) to the action of a gas and fine-grain solid materials, with a water-cooled first lance (17) for supplying the gas, in accordance with the inve... | 01/22/1991 |
| 4970051 | Process for the introduction of nitrogen into cast iron The present invention provides an agent for the introduction of nitrogen into cast iron, wherein it contains or consists of at least 50% by weight of at least one nitrogen-containing compound with an N--C--N structure and/or a mixture of calcium cyanamide... | 11/13/1990 |
| 4919714 | Method and apparatus for refining steel Disclosed are an improved method of refining steel and an apparatus for practicing the method. The refining method comprises, basically, carrying out the refining, particularly, decarburization, while stirring molten steel in the refining furnace by injec... | 04/24/1990 |
| 4900357 | Injection of substances into high temperature liquids Gas injection into a metal melt, accompanied if desired by powdered or solid treatment substances, is by way of a nozzle inserted into the wall of a melt-containing vessel. The nozzle bore initially has a stopper at its inner end and a delivery pipe small... | 02/13/1990 |
| 4874428 | Fluidizing a lime-silica slag A method of fluidizing a cold lime-silica slag covering a molten metal. An acid flux is prepared from a particulate admixture of sodium fluoroaluminate and sodium silicate. The flux is mixed with the cold slag forming a fluid slag having at least 1% by we... | 10/17/1989 |
| 4783057 | Metal refining with refractory coated pipe Disclosed is a heat resistant composite comprising a refractory coating on a metal substrate. The refractory coating is provided by mixing a refractory mortar with water, impregnating a water absorbent web of fibrous material with the liquid mixture, plac... | 11/08/1988 |
| 4708736 | Method of producing molten pig iron or steel pre-products from particulate ferrous material In a method of producing molten pig iron or steel pre-products from particulate ferrous material, as well as of producing reduction gas in a melt-down gasifier by adding coal and by blowing in oxygen-containing gas by means of nozzle pipes penetrating the... | 11/24/1987 |
| 4701215 | Apparatus for introducing substances into liquids e.g. metal melts For introducing gases, wires and powders to metal melts, a multi-ducted refractory body (11) is installed in the wall (14) of a vessel (15) for the melt. The body has passage closing elements (24, 34, 35) preventing melt entering the passages (A, B, C). T... | 10/20/1987 |
| 4675049 | Process for producing high quality steel A process for producing high quality steel includes a first step of decarburizing the melt in a converter by top blowing with oxygen to a carbon content of less than 0.1% carbon. Next, carbon (comminuted coal) is delivered to the melt at a high velocity w... | 06/23/1987 |
| 4652306 | Method of refining molten steel by arc process Molten steel is tapped from a converter into a refining ladle, and an ore such as Nb2 O3 ore is charged into the molten steel. Then, the interior of the refining ladle is held in an inert gas atmosphere. A reducing agent such as an A... | 03/24/1987 |
| 4551173 | Method for adjusting composition of molten steel in arc process Molten steel is refined in a converter and is poured from the converter to a ladle. A ferro-alloy containing a component to be adjusted is added to the molten steel as needed. An amount of the alloy to be added to the molten steel in the ladle is calculat... | 11/05/1985 |
| 4540432 | Continuous process of melting sponge iron The melting operation is carried out in an elongated horizontal reactor, in which sponge iron is charged onto the molten material in an intermediate region of the reactor, carbonaceous fuel and high-oxygen gases are blown into the molten material and slag... | 09/10/1985 |
| 4539042 | Preventing an increase of the nitrogen content in molten steel Following the discharge of steel from a steel producing converter, the adding and inclusion of nitrogen is impeded by surrounding the stream of pouring steel with a layer of limestone at a grain size not exceeding 5 mm. Practice has shown that the nitroge... | 09/03/1985 |
| 4537629 | Method for obtaining high purity ductile iron A method for making high quality liquid iron with substantially no residual chemical elements and a controlled content of carbon, manganese, phosphorous, sulfur and silicon in the final metal. Sponge iron, as raw material, is melted in a vessel or convert... | 08/27/1985 |
| 4518422 | Process and apparatus for refining steel in a metallurgical vessel A process and apparatus for the desulphurization, deoxidation and purification of a metal melt is presented. The process is particularly well suited for use in a ladle during the refining of steel. The present invention comprises means for defining at the... | 05/21/1985 |
| 4511397 | Process for increasing the degree of afterburning of carbon monoxide in the refining of iron melts A process for increasing the extent of afterburning of carbon monoxide formed during the decarburization of iron melts by the action of oxygen is presented. This process is accomplished by delivering a finely divided catalyst to the space above the iron b... | 04/16/1985 |
| 4426224 | Lance for powder top-blow refining and process for decarburizing and refining steel by using the lance The invention relates to a refining lance used in blowing some additive into molten metal in a vacuum vessel when molten metal, such as molten steel, refined by employing a converter or electric furnace or the like is further refined into a metal having t... | 01/17/1984 |
| 4407490 | Method and a means for introducing close-grained carbonaceous fuels into an iron melting bath A method and a means for introducing close-grained carbonaceous fuels, which are suspended in a carrier gas, and oxygen into an iron melting bath are described. In this method the fuel and the oxygen can be alternately introduced through the same introduc... | 10/04/1983 |
| 4406443 | Apparatus for distributing gas-laden refining powdered-particles into molten metal An apparatus for injecting a gas-laden refining agent into molten metal in a ladle comprises a multinozzle lance which has a plurality of introduction tubes in a lance body and a plurality of nozzles mounted in the lance body and connected to the introduc... | 09/27/1983 |
| 4389245 | Lance ladling A method and apparatus for concurrent introduction of molten steel and gas-fluidized chemical steel additives, such as chemical desulphurants, into a teeming ladle 10. Injection apparatus includes a lance 52 arranged to remain with the vessel. Introductio... | 06/21/1983 |
| 4388113 | Method of preventing damage of an immersed tuyere of a decarburization furnace in steel making In bottom blown oxygen steel making or in top and bottom blown combined oxygen steel making, a tip end of a tuyer immersed in molten steel is seriously damaged or melted away due to very high temperatures due to the vigorous combustion of carbon, manganes... | 06/14/1983 |
| 4373967 | Process for making resulfurized machinable steel A melt is produced composed of iron, manganese and carbon in known ratios for free-cutting carbon steel with sulfur being included at roughly 0.15%. Aluminum and silicon are added to kill the steel fully and silica and alumina are added to the slag as con... | 02/15/1983 |
| 4341553 | Method of, and cupola furnace for, the introduction of treatment agents into cupola iron melts A cupola furnace has a hearth 1 with tuyeres 2, a floor 3 and a tapping duct 4 leading to a forehearth 5. To enable treatment agents to be introduced into the melt in the furnace below the surface of the melt, the furnace is additionally provided with a l... | 07/27/1982 |
