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6562096 |
Management of electric arc furnace dust through a basic oxygen furnace
A method of processing electric arc furnace (EAF) dust which involves processing the EAF dust through a basic oxygen furnace (BOF). The method encompasses recovery of iron value from the EAF dust...
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6395057 |
Method for producing directly reduced iron in a layered furnace
A method for producing reduced iron in a layered furnace which includes several superimposed layers. Ore is continuously fed into the layered furnace, deposited on the uppermost layer, and...
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6395052 |
Method for producing directly-reduced iron, liquid pig iron and steel
The invention relates to a process for producing directly reduced iron, liquid pig iron and steel, in which charge materials, which are formed from iron ore, preferably in lump and/or pellet form,...
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6375701 |
Method of judging slag forming state in electric furnace steel production and method of operating electric furnace
The state of slag foaming generated in an electric furnace steel manufacture is judged by measuring the NO x amount in exhaust gas. The foaming state is adjusted to completely interrupt the...
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6372009 |
Method for reducing CO and VOC's in steelmaking furnace off-gas stream without forming or exhausting undesirable products
A process and apparatus for continuously reducing carbon monoxide (CO), uncombined free hydrogen (H 2 ) and volatile hydrocarbons (VOC's) in molten metal refining vessel off-gases without forming...
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6206948 |
Metal reduction and melting process and apparatus
A metal reduction and melting process which involves the heating of a burden comprising a metal containing component and a carbon containing component in a channel type induction furnace in order...
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6136059 |
Process for reducing the electric steelworks dusts and facility for implementing it
A process for processing electric steelworks dusts containing oxidized high-iron, zinc-bearing materials in order to recover iron and zinc from [them] said dusts. The process includes the steps of:...
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6083294 |
Method of treating dust exhausted from melting furnace
A method of treating dust exhausted from a melting furnace in melting an iron-contained material, comprising the steps of: melting the iron-contained material, with air inside the melting furnace...
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6004369 |
Steel production method
The invention relates to a method to produce steel from a ferrous material, by using one furnace divided into, at least, two vessels which are connected to each other at least by ducts for the...
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5961688 |
Process and device for making liquid iron by non-electric and electric smelting
A process and a steelmaking device for the metallurgical treatment of iron metals, especially for producing steel melts. To carry out metallurgical processing of iron metals, and especially to...
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5611838 |
Process for producing an iron melt
There is disclosed a process for producing an iron melt in a reactor with current supply. In order to utilize fine-grained iron carriers in a particularly economic manner while minimizing the...
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5541952 |
Apparatus and method of preheating steel scrap for a twin shell electric arc furnace
Apparatus and methods of abating the objectionable emissions of volatile hydrocarbons generated during the preheating cycle of a twin vessel electric arc furnace steelmaking operation wherein the...
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5366538 |
Process for the production of a metal melt
In a process for the production of a metal melt in a metallurgical vessel, the filter dusts incurring in producing the metal melt are to be processed to charging substances without causing a load...
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5316565 |
Carbothermic reduction product gas treatment
Method and apparatus for reducing the quantity of carbon dioxide emitted to the atmosphere from carbothermic processes producing metals are described. The method involves rejecting carbon from the...
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5264020 |
Smelting plant with two melting furnaces arranged in juxtaposed relationship
In a smelting plant including two melting furnaces which are arranged in juxtaposed relationship and which are operated alternately, wherein the furnace gases which are produced in the melting...
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4950324 |
Tri-level method and apparatus for post melting treatment of molten steel
This invention relates to a new method for the post melting treatment of molten steel in all, or nearly all, of the post melting systems in use at this time to lower the oxygen, hydrogen, and, to...
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4898712 |
Two-stage ferrosilicon smelting process
The present invention relates to a process for the production of ferrosilicon in a closed two-stage reduction furnace. In the present invention, carbon monoxide released as a result of the smelting...
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4692113 |
System using electric furnace exhaust gas to preheat scrap for steelmaking
Dust containing high-temperature gas exhausted from an electric steelmaking furnace is directed through scrap preheaters, wherein scrap that is to be charged into said electric furnace is...
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RE32247 |
Process for the direct production of steel
A process for the direct production of steel from particulate iron oxides or concentrates including two major steps in which in Step (1) the iron oxides are converted to iron carbide and in Step...
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4577838 |
Treatment of pelletized iron ores
A system for providing thermal and chemical energies for the production of pelletized iron ore concentrates while allowing a reduction of a portion of the material in process. The material in...
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4531971 |
Method of and apparatus for melting scrap
A method of melting iron scrap using an arc furnace with reduced electric power consumption. In one of a pair of vessels which are arc furnace bodies, melting of the scrap by heat of arc is carried...
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4514219 |
Method of producing molten metal
A furnace for the melting of ferriferous materials, namely, iron scrap, pig iron and sponge iron having a low oxygen content, is operated by the addition of coke to the charge so that the quantity...
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4464197 |
Method for making iron by induction heating
An improved method and apparatus for making metallic iron from iron ore including low-grade ore by the use of a solid reductant such as coal in a completely enclosed system wherein the heat for...
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4434001 |
Method for manufacturing metal from fine-grain metal-oxide material
A method for producing fine-grain iron-containing metal oxide material, the method comprising a first reduction stage wherein the oxide material is at least partially reduced in a fluidized state...
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4421553 |
Process for operating a blast furnace
In a method of controlling a blast furnace wherein iron ore is reduced to form pig iron and there being at least one reactor used for heating a reducing gas which reducing gas is introduced to at...
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4416689 |
Process for the manufacture of crude iron and energy-rich gases
A process for preparing crude iron and energy-rich, gases, the raw materials being comprised of iron ore concentrate, carbon-containing materials, optionally oxygen gas and electric energy,...
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4394163 |
Process for the manufacture of crude iron and synthesis gas
In a combined process crude iron and a synthesis gas particularly suitable for the preparation of methanol are prepared by supplying iron ore concentrate to the plasma zone between an electrode and...
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4362555 |
Method and apparatus for manufacturing sponge iron
Disclosed are a method and apparatus for manufacturing sponge iron by the continuous reduction of iron oxides in a shaft utilizing recirculation gases. Reaction gas is removed from the shaft...
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4318736 |
Method for manufacturing steel from iron ore dust by direct reduction
The invention relates to methods and apparatus for manufacturing steel from iron ore dust by direct reduction. The iron ore dust is preheated, then reduced with a gas mixture contaning monoxide....
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4306903 |
Method for reducing particulate iron oxide to molten iron with solid reductant and oxy-fuel burners
A method and apparatus for reducing particulate iron oxide to molten iron utilizing solid carbonaceous fuel as reductant in a shaft type reducing furnace, in which a furnace burden is formed of a...
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4290800 |
Process for feeding iron sponge into an electric arc furnace
Iron sponge, containing at least 0.5% carbon, is preheated with an oxidizing gas as the gas flows in a direction traverse to the direction of the sponge, without combustion of the iron sponge.
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4280836 |
Method of preheating iron scraps in steel-making by the electric arc furnace
A method of preheating iron scraps in steel-making by the electric arc furnace, by utilizing high-temperature exhaust gas to be discharged from the electric arc furnace. This method shortens, to a...
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4156102 |
Method for producing ferro-alloys
An improved method and apparatus for producing ferro-alloys from ore in which an ore is first mixed with a solid reducing agent, preheated and pre-reduced in a rotary kiln, and smelted in an...
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4111687 |
Process for the production of intermediate hot metal
A process and apparatus for the production of intermediate hot metal suitable for further refining into steel is disclosed. The basic process includes the steps of heating a charge of ore in a...
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4087274 |
Method of producing a partially reduced product from finely-divided metal sulphides
There is provided a method of producing a partially reduced product from finely divided metal oxide containing material. The product is suited for continued reduction and the material containing...
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4076954 |
Method and an electrically heated device for producing molten metal from powders or lumps of metal oxides
This invention is related to a method and a process for producing metals by reducing and smelting metal oxides in two steps, the first of said steps comprising prereduction of a metal oxide charge....
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4061492 |
Method of ore reduction with an arc heater
A two-stage process for converting metal-bearing ore to a metal or an alloy characterized by the steps of, first, partially reducing an ore having a relatively higher valence state to an...
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4019895 |
Method of reducing ore using a plasma burner
A method of producing metal from an oxidic material wherein final reduction and melting of a pre-reduced oxidic material takes place in the presence of a solid reduction agent in lump form, and...
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4014681 |
Vehicle recycling process
A vehicle recycling plant comprising a furnace, means for introducing a fuel into said furnace, a cupola disposed in close proximity to said furnace, and communicating therewith so that the hot...
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3997333 |
Process for the reduction of complex metallic ores
A process for the beneficiation and reduction of complex metallic ores characterized by the step of first preheating a complex ore containing a plurality of metal oxides in a reducing gas...
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3993473 |
Method of reducing iron oxide
Iron ore particles are partially reduced by passing through a rotary kiln countercurrent to flowing hydrogen and carbon monoxide. The partially reduced ore is then fed into a plasma arc torch...
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3964898 |
Process for batch production of sponge iron
Sponge iron is produced by a process including a charging step during which an iron oxide is arranged as a stationary bed in a furnace chamber, a heating step during which a hot, preferably...
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3953196 |
Process for the direct reduction of metal oxides
Metal oxides are directly reduced by charging metal oxide-carbonaceous agglomerates to a shaft furnace, passing said pellets downwardly countercurrent to a flow of hot gases in a reduction zone,...
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3941359 |
Apparatus for direct reduction of iron oxides
A method of and apparatus for reducing an oxide of iron such as the oxides which occur in mill scale involves mixing particles of the oxide with particles of a carbonaceous reducing agent and...
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3929459 |
Charging an electric furnace
A metallic charge is introduced into an electric furnace in a continuous fashion using as a feeding device an unobstructed tubular container of undulant or zig-zag shape. The feeding device is...
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3912501 |
Method for the production of iron and steel
Process for production of iron and steel. Although initial reduction is performed in rotary kiln or similar apparatus, products of excellent quality can be produced at lower cost than in processes...
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3887360 |
Methods and furnaces for steel manufacture by direct reduction and melting of iron ore
Improvements in method and apparatus for manufacturing and melting of iron from dressed ore or pellets, carried out in two steps, wherein the first step is a pre-reduction step in which reduction...
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3880648 |
Method for producing steel in an electric arc furnace
A method for producing steel in an electric arc furnace to increase its productivity and overall efficiency, which method utilizes apparatus comprising two roofs and a preheater station. One roof...
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3876418 |
Method for collecting the flue gases produced upon the charging of scrap and tapping of steel from electric furnaces
This disclosure teaches a method and related system for collecting gases generated upon charging of scrap to and tapping of steel from an electric furnace. A charging basket is brought into sealed...
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3864122 |
Method for producing steel
A method for producing steel, including flowing a reducing gas through a plurality of jacket-heated shaft-furnace units containing iron ore pellets, always from a shaft-furnace unit containing iron...
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