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7094271 |
Method for producing stainless steels, in particular high-grade steels containing chromium and chromium-nickel
The invention relates to a method for producing stainless steels, in particular steels containing chromium and chromium-nickel. The method is carried out in a melting device containing a...
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6685761 |
Method for producing beneficiated titanium oxides
The invention is a method and apparatus for producing beneficiated titanium oxides using a modified rotary hearth furnace, that is a finisher-hearth-melter (FHM) furnace. In the method the...
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6669756 |
Discharge apparatus for movable hearth type heat-treatment furnace, its operation method, and method and apparatus for manufacturing molten iron using the same
Heat-treated products discharged from a discharge port of a movable hearth type heat treatment furnace, for example a rotary hearth type reduction furnace are discharged to a sorting means, the...
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6635096 |
Method for optimizing the operating conditions of a submerged arc furnace
A method for producing molten metal by the reduction and melting of raw materials in a submerged arc type electric furnace includes at least one electrode, where substantial amounts of slag are...
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6589667 |
Spherical porous iron powder and method for producing the same
The invention concerns an iron powder characterised by spherical form and a porous structure throughout. The powder particles have an average particle diameter between 10 and 300 μm, a specific...
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6582491 |
Method for producing molten iron in duplex furnaces
This invention relates to a method for operation of a moving hearth furnace in conjunction with an electric melter for production of high purity iron product having a range of silicon and...
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6524362 |
Method of melting fine grained direct reduced iron in an electric arc furnace
The direct reduced iron (DRI) which for at least 80 wt-% has a grain size of not more than 3 mm is melted in an electric arc furnace. The furnace contains a bath of liquid iron. During the...
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6503289 |
Process for manufacturing molten metal iron
A process comprising: charging a raw material compacting substance containing a carbonaceous reducing agent and an iron oxide contained substance into a moving hearth type furnace; reducing the raw...
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6478841 |
Integrated mini-mill for iron and steel making
Disclosed is a method for steel making which includes charging a direct reduction reactor (DRR) with iron ore from a charging system. The iron ore is reduced to hot direct reduced iron (DRI) in the...
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6406512 |
Method for producing high-purity niobium
A method for producing high-purity niobium involves refining crude niobium in an electrolyte comprising a melt of salts containing a complex niobium and potassium fluoride and an equimolar mixture...
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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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6372011 |
Method for producing an iron melt using iron-containing residual smelting plant materials
For effectively reprocessing iron-containing residual smelting plant materials ( 1 to 3 ), in which iron may be present both in metallic form and in oxidic form, with lowest possible energy...
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6284018 |
Method of making iron and steel
Molten iron is prepared by (1) providing iron oxide and a carbonaceous reducing agent, (2) preparing a shaped product from the carbonaceous reducing agent and the iron oxide, (3) preparing solid...
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6241798 |
Iron smelting process and plant according to the multiple zone smelting process
In order to be able to process in an economical manner different iron carriers in varying quantitative compositions, a plant for the production of iron melts (4), in particular steel melts, such as...
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6238453 |
Producing stainless steels in parallel operated vessels
A process for producing stainless steels, particularly special steels containing chromium and chromium-nickel, in a smelting arrangement having at least two vessels, for supplying a steel foundry....
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6162274 |
Steel production method
A steel production method including preparing reduced iron pellets, taking a first portion of the reduced iron pellets and charging the first portion of the reduced iron pellets in a submerged...
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6146437 |
Metal containing compound reduction and melting process
The present invention provides a metal containing compound reduction and melting process which entails feeding a burden made of a mixture of the metal containing compound and a suitable reductant...
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6053958 |
Process for preparation of fertilizer containing slag
Soil fertilizing and soil improving products may be made by a process which comprises admixing a pulverized waste copper slag with concentrated sulfuric acid having a strength of about 93.17% by...
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6001148 |
Process for obtaining metal from metal oxide
A process for producing metals in the reduced state from their oxides using a simple and less expensive facility with lower running cost. A metal oxide in the form of particles is supplied into a...
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5972066 |
Mixed bed iron reduction process
The present invention provides a method for producing direct reduced iron in a continuous and efficient fashion, which includes providing a mixture of a particulate iron oxide composition and a...
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5882375 |
Process for the production of hydraulic binders and/or alloys, such as for examples, ferrochromium or ferrovanadium
In a process for the production of hydraulic binders, crude steel and/or alloys, such as, e.g., FeCr or FeV, from basic steel slags containing chromium and/or vanadium, the liquid steel slag is...
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5810905 |
Process for making pig iron
A process for producing pig iron from iron ore fines wherein the fines are partially reduced in a fluid bed reactor and, without pelletizing, briquetting or otherwise agglomerating the partially...
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5803947 |
Method of producing metallic magnesium, magnesium oxide or a refractory material
Metallic magnesium and pure magnesium oxide are produced by carbothermal reduction of starting materials such as magnesium oxide containing minor amounts of oxides of Fe, Si, Ca and Al, and/or...
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5800591 |
Method and apparatus for feeding a steelmaking furnace
A heat processing furnace is provided with a bifurcated feeder which allows scrap steel to be introduced to the furnace from an associated preheater, and direct reduced iron, slag formers,...
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5709730 |
Hydrometallurgical processing of flue dust
Electric arc furnace production of recycled steel is plagued by the formation of an iron-depleted, metal-rich electric arc flue dust (EAFD). In the present invention, we recover at least about 85...
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5700308 |
Method for enhancing reaction rates in metals refining extraction, and recycling operations involving melts containing ionic species such as slags, mattes, fluxes
A method and apparatus for enhancing reaction rates between ionic species such as slags, mattes, fluxes and the like with at least another component such as similar melts, metals, chemical...
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5695543 |
Method for metal reduction of steel waste products
A method and system for recovering metal from steel waste products is disclosed. This method and system works on such hazardous and/or toxic wastes as mill scale, flue dust and slag. This method...
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5681367 |
Method of producing hot metal
A method for preparing iron bearing green pellets that can be processed in a rotary hearth furnace without degradation and become self-fluxing sponge iron pellets when charged to a submerged arc...
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5667553 |
Methods for recycling electric arc furnace dust
A method for the separation and recovery of metals selected from the group consisting of iron, cadmium, zinc, and lead, from raw material comprising a mixture of metals, which comprises the steps...
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5654976 |
Method for melting ferrous scrap metal and chromite in a submerged arc furnace to produce a chromium containing iron
The process feeds a mixture of scrap metal, chromite, flux materials, carbonaceous material and wood chips to a submerged arc furnace to make a base iron suitable for iron and steel purposes. The...
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5632800 |
Accelerated decarburization of Fe-C metal alloys
A process for improving the rate of metal production and FeO utilization in a steelmaking process or a process combining iron-making and steelmaking in a single reactor that uses or generates Fe-C...
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5573573 |
Electric arc furnace arrangement for producing steel
There is disclosed an electric arc furnace for the production of steel by melting scrap, in particular iron scrap, and/or sponge iron and/or pig iron as well as fluxes in a furnace vessel, into...
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5562753 |
Method and installation for producing molten steel from ferrous materials rich in carbonaceous materials
Both a method and apparatus for producing molten steel are provided wherein ferrous materials rich in carbonaceous materials are fused in a first vessel of a single electric furnace having separate...
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5531805 |
Smelting ferrous materials
Finely divided ferruginous material is intimately mixed with finely divided carbonaceous material and agglomerated and formed into pellets typically of a few cubic centimeters volume to form a...
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5529599 |
Method for co-producing fuel and iron
A method for the co-production of fuel and iron from coal and from iron ore respectively, which is comprised of heating the coal in the absence of oxygen to make a raw coal gas and a residual coke,...
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5400358 |
Continuous scrap preheating
A method and apparatus for reducing the production or emission of noxious gases while continuously preheating a mixture of iron-bearing scrap charge materials for an electric steelmaking furnace...
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5364441 |
Cotreatment of sewage and steelworks wastes
Steelworks dusts or sludge is mixed into sewage preferably in the presence of a flocculating agent to provide a rapid separation of a clear effluent and a sludge which is dewatered and dried to...
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5350434 |
Process and apparatus for making molten steel
The process for making a refined molten steel includes melting preheated solid iron sources and solid carbon sources in a melting vessel with heat generated by electric arc to form a...
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5322113 |
Method of producing amorphous alloy thin strip for commercial frequency band transformers
A method of producing amorphous alloy thin strip suitable for use in commercial frequency band transformers utilizes a high-quality molten steel suitable for electromagnetic silicon steel plates...
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5314524 |
Process of discharging charge-build up in slag steelmaking processes
A process and apparatus for improving metal production in ironmaking and steelmaking processes is disclosed. The use of an inert metallic conductor in the slag-containing crucible and the addition...
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4981510 |
Process and apparatus for the production of ferrochromium
A process and apparatus for producing ferrochromium having a carbon content ranging from about 0.02 to about 10 weight percent includes providing a mixture comprised of iron-containing chromium...
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4927457 |
Method of manufacturing low carbon ferro-chromium
Ores including oxides of Cr and Fe and melted by means of a furnace, thereby forming molten metal. The molten metal is poured from the furnace into a ladle. A reducing agent, such as SiCr, is added...
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4906522 |
Compounds of nickel, iron and phosphorus
Compositions of nickel, iron and phosphorus, are prepared by fusing nickel and ferrophosphorus in an inert atmosphere, with the nickel preferably comprising from about 5% to about 70% by weight of...
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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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4865643 |
Smelting process for making elemental silicon and alloys thereof, and apparatus therefor
A smelting process for making elemental silicon and alloys thereof is disclosed. The smelting process is of the electrometallurgical type for producing elemental silicon from silicon dioxide...
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4859237 |
Hydrometallurgical process for producing spherical maraging steel powders with readily oxidizable alloying elements
A process for producing a blend of maraging steel alloys and an oxidizable metal comprises forming an aqueous solution or iron, cobalt, nickel and molybdenum in a predetermined ratio. Thereafter, a...
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4775521 |
Process for the production of ferrous sulphide
Ferrous sulphide is produced by forming a melt of a source of sulphur, suitably flotation grade iron pyrites, and a source of iron, suitably steel, in an electric induction furnace until reaction...
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4731112 |
Method of producing ferro-alloys
A method of making a molten ferroalloy product in a melting furnace by charging a briquet consisting essentially of metallized iron, granulated alloy metal oxide, and a carbon source, such as coke...
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4629506 |
Process for the production of ferrochromium
A process for the production of ferrochromium from iron-containing chromium ores, in which the reduction of the ore, which is mixed with coal and slag-forming constituents, is conducted in a rotary...
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4613363 |
Process of making silicon, iron and ferroalloys
The present invention relates to the use of self-reducing compacts as a feed material for a submerged electric arc furnace. The compacts are comprised of finely-divided carbon-reducible oxide...
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