Abstract:
En la presente invencion se revela un proceso y una instalacion para la fabricacion de acero para el tratamiento metalurgico de metales de hierro, en particular para producir acero forjado. Para llevar cabo el tratamiento químico de los metales de hierro, en particular para producir acero forjado, de una manera con ahorro de energía, ambientalmente segura y economica, todas las operaciones metalurgicas se llevan a cabo en un recipiente que actua primero como un convertidor y después toma la funcion de un horno de arco directo sin la necesidad de vaciar el producto fundido en otro recipiente.
Abstract:
A method of operating a metallurgical furnace, and a furnace apparatus capable of using this method, in which coal is pulverized in a pulverizer vessel by interparticle collisions in at least one stream of gaseous medium, to produce ultrafine pulverized coal and feeding a mixture of the ultrafine pulverized coal and gaseous medium directly and continuously from the pulverizer vessel to the metallurgical furnace.
Abstract:
The method for making steel from solid metal Fe-bearing materials, particularly from scrap material, in an oxygen converter provides for heating and melting solid metal Fe-bearing materials by the bottom- and lateral-blown fuel and oxidizer feed, which is effected upwards and sideways across the thickness of the metal materials charged into the converter, and by the top-blown oxidizer feed. Then the metal melt is refined and a silicon-containing and heat-conveying material is added thereinto simultaneously. At the same time the lateral and top-blown oxidizer feed is discontinued and the bottom-blown oxidizer feed is reduced.
Abstract:
A method of steel production in an oxygen converter from solid metallic Fe-carriers, in which the metallic Fe-carriers are heated and melted by burning a solid carbon-containing fuel while continuously feeding the oxygen, the fuel being fed to the converter in two portions: the first - together with the Fe-carriers and the second - along the path of the oxygen. The solid carbon-containing fuel used for the first portion is a gas coal in a quantity of 20 to 30% by weight of the total quantity of the solid carbon-containing fuel needed for the melting process. The second portion of the solid carbon-containing fuel is charged after consumption of 20 to 30% by weight of the total oxygen needed for the melting process.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung hochlegierter Stähle, insbesondere mit hohen Legierungsgehalten an sauerstoffaffinen Elementen, wie Chrom und Mangan, im Sauerstoffblaskonverter. Um ein Verfahren anzugeben, mit dem im Sauerstoffblaskonverter hochlegierte Stähle, insbesondere Stähle mit hohen Gehalten an Legierungselementen, deren Sauerstoffaffinität größer ist als die des Eisens, ohne Schwierigkeiten und ohne Abbrandverluste während des Frischprozesses hergestellt werden kann, wird vorgeschlagen, daß in einer ersten Herstellungsstufe der aus Eisenträgern und Schlackebildnern bestehende Einsatz durch Sauerstoffblasen unter der sich bildenden basischen Schlacke entkohlt, entphosphort und entschwefelt und auf Abstichtemperatur erhitzt wird, daß die Stahlschmelze unter Zurückhaltung der Konverterschlacke ab gestochen und während des Abstiches desoxidiert und legiert und mit neuen Schlackenbildnern, wie Kalk, Flußspat und ggf. Tonerde, eine hochbasische Schlacke erzeugt wird, wobei die mindestens zur Desoxidation verwendete Menge an Reaktionsmitteln, insbesondere Silizium, höcher ist als zur Erzielung der vorgeschriebenen Zusammensetzung notwendig und die Menge der Legierungsmittel nach der für den Aufschmelzvorgang vorhandenen Wärmemengenreserve der Schmelze bestimmt wird, und in einer zweiten Stufe die Schemlze in einen Sauerstoffblaskonverter gefüllt und auf einem gewünschten Gehalt wenigstens eines Desoxidationsmittels und die notwendige Endtemperatur fertiggeblasen wird, ggf. unter Zugabe weiterer, zur Erzeugung der Endanalyse notwendiger Legierungsmittel.
Abstract:
A process for decarburizing high-Cr molten pig iron under atmospheric pressure in a short time with minimized Cr loss due to oxidation is disclosed. A fundamental feature of the process comprises top-blowing decarburizing O2 diluted with an inert gas through a top-blowing lance against high-Cr molten pig iron in a vessel and at the same time blowing an inert gas through a bottom-blowing tuyere to vigorously stir the molten pig iron. Another feature of the process comprises controlling a slag amount in the above-described decarburizing blowing to thereby depress Cr loss due to oxidation. A further feature comprises conducting a predetermined denitrification after the blowing to thereby economically produce low-nitrogen molten iron with depressed Cr loss due to oxidation.
Abstract:
A method of steel production in an oxygen converter from solid metallic Fe-carriers, in which the metallic Fe-carriers are heated and melted by burning solid, liquid and gaseous carbon-containing fuel while passing the oxidizer through the Fe-carriers and the solid fuel, which are loaded in the converter. The liquid fuel used is a fuel with a density of 800 to 1100 kg/m3, which is fed into the converter before the heating of the charge so as to provide a film of the liquid carbon-containing fuel on the surface of the charge.
Abstract:
Method and apparatus for post-combustion (after-burning) of the combustible gases present in a metallurgical vessel used for smelting metals. A swirling flow of an oxidizing gas emanating from a radiant injector (10) having a funnel-shaped (conical) diffuser (14) causes a reaction between the combustible gases and the oxidizing gas at the inner surface (13) of the diffuser (14) thereby further heating the inner surface (13). Heat from the inner surface (13) of the diffuser (14) is radiated inside the vessel toward the metal (12). Fuel gas can be supplied to the radiant injector to aid in heating of the inner surface (13) of the diffuser (14).
Abstract:
The proposed method consists in that in the course of steel smelting the oxygen is supplied in a quantity allowing a melt to be obtained with a temperature 5 to 50 degrees above that of the steel to be smelted. As a reducing agent, materials containing carbon and aluminium are used in quantities corresponding to the ratio between the carbon of the carbon containing material and the aluminium of the aluminium containing material, equal to 1:(1-3) respectively, and a mixture of an inert and natural gas is blown through the melt from the bottom. The present invention may be used, in particular, for the production of manganese steel.