Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Kabushiki Kaisha Kobe Seiko Sho (kobe Steel, Ltd.)

Kabushiki Kaisha Seiko Sho

Hiroshi Sugitatsu

Takao Harada

Hidetoshi Tanaka

Itsuo Miyahara

Hideaki Fujimoto

Masahiko Tetsumoto

Masataka Tateishi

Hiroshi Uemura

Isao Kobayashi

Tsuyoshi Mimura

Kiminori Hajika

Hiroshi Tamazawa

Takeshi Sugiyama

Sumito Hashimoto

Toshiyuki Okumura

Kojiro Fuji

Koichi Morioka

Yoshiyuki Matsui

Takeshi Maki

Tadashi Ueda

Masaharu Kohno

Nobuyuki Iwasaki

Masaaki Atsushi

Korehito Kadoguchi

The present invention is directed to provide a production method for carbonaceous material-containing metal oxide briquettes, capable of ensuring sufficient strength of briquettes while using a metal oxide material containing a large amount of fine particles, such as steel mill dust. This method comprises a mixing step of mixing a metal oxide material A containing a large amount of fine particles with a carbonaceous material B in a mixer, to form a powdery mixture E, a compacting step of compacting the powdery mixture E using a briquette machineto form compacts F, a classifying step of classifying the compacts F into an oversize fraction G and an undersize fraction H, using a sieve, and collecting the oversize fraction G as product briquettes, and a compact circulating step of returning a part of the compacts F to the mixeror the briquette machine, as a recycle material.

Production method for carbonaceous material-containing metal oxide briquettes

An iron melting furnace has a refractory lined furnace body having a top opening through which raw materials including a raw material iron source, a carbonaceous material and a slag forming material may be introduced. A heating system is provided for injecting oxygen-containing gas into the furnace body to combust the carbonaceous material, whereby combustion heat can melt the raw material iron source to generate molten iron and molten slag to form a molten iron and slag bath. A plurality of tap holes penetrate the furnace body and are provided at positions different from one another in a height direction of the furnace body, and a refractory filling which is different from the refractory liner material fills at least one of the tap holes such that molten iron or slag in the furnace is unable to flow through the tap hole being filled with the refractory material.

Iron bath-type melting furnace

A method for producing molten iron by melting an iron source material using an iron bath-type melting furnace comprising a top-blowing lance at an upper part of the furnace, a bottom-blowing tuyere in the bottom of the furnace and a tap hole at a lower part on the side of the furnace, the method comprising: a melting process of melting the iron source material, wherein the melting process has at least one tapping process of discharging the molten iron and the slag through the tap hole while holding a position of the furnace in generating the molten iron, and the tapping process continues or interrupts generation of the molten iron and continues top-blowing of the oxygen-containing gas to thereby keep a temperature of the molten iron in the furnace at or above a pre-set lowest temperature of the molten iron.

Method for producing molten iron

An object of the present invention is to provide a method for reducing a chromium-containing material at a high chromium reduction degree. In the method of the present invention, a mixture of a feedstock containing chromium oxide and a carbonaceous reductant is heated and reduced by radiation heating in a moving hearth furnace. The average rate of raising the temperature of the mixture in the reduction is preferably 13.96&#xb0; C./s or higher in the period from the initiation of the radiation heating of the mixture until the mixture reaches 1,114&#xb0; C.

Method for reducing chromium containing raw material

A method for producing carbon composite metal oxide briquettes includes a mixing step of adding a binder to a metal oxide raw material and a carbonaceous material and mixing the metal oxide raw material, the carbonaceous material, and the binder by a mixer to prepare a powder mixture, and a forming step of forming the powder mixture into carbon composite metal oxide briquettes by using a briquetting machine, in which, in the mixing step, a batch mixer is used as the mixer.

Method for producing carbon composite metal oxide briquettes

The method includes the steps of: adding a carbonaceous material B and a binder C, and optionally water, to electric furnace dust A generated in a steelmaking electric furnace, to form a powdery mixture D having a water content of 0.5 to 3 mass %; compacting the powdery mixture D into a raw briquette E; and charging the raw briquette without drying into a rotary hearth furnaceand thermally reducing the raw briquette to obtain a reduced iron briquette F and a crude zinc oxide G.

Method for reduction treatment of electric furnace dust

The present invention provides a method for efficiently manufacturing a titanium oxide-containing slag from a material including titanium oxide and iron oxide, wherein a reduction of titanium dioxide is suppressed and the electric power consumption is minimized. The method includes the steps of: heating a raw material mixture including titanium oxide, iron oxide, and a carbonaceous reductant, or the raw material mixture further including a calcium oxide source, in a reducing furnace; reducing the iron oxide in the mixture to form reduced iron; feeding the resultant mixture to a heating melting furnace; heating the resultant mixture in the heating melting furnace to melt the reduced iron and separate the reduced iron from a titanium oxide-containing slag; and discharging and recovering the titanium oxide-containing slag out of the furnace.

Method for manufacturing titanium oxide-containing slag

A process for producing molten iron is a process in which while an inert gas is blown into a molten iron layer in an iron bath type melting furnace through bottom-blown tuyeres provided in a hearth bottom thereof to stir the molten iron layer, a carbon material, an additive flux, and solid reduced iron obtained by heating reduction of carbon composite iron oxide briquettes are charged into the above melting furnace, and top blowing of an oxygen-containing gas is performed through a top-blown lance provided for the melting furnace, so that the solid reduced iron is melted by combustion heat obtained by combusting the carbon material and/or carbon in molten iron to form molten iron.

Process for producing molten iron

A method for manufacturing molten iron comprises charging a carbonaceous material, a flux, and solid reduced iron obtained by thermally reducing carbon composite iron oxide agglomerates into an arc melting furnace and melting the solid reduced iron using arc heating in the melting furnace while an inert gas is blown into a molten iron layer from a bottom blowing tuyere on a bottom of the melting furnace, wherein: a carbonaceous material suspending slag layer is formed in an upper portion of a slag layer formed on the molten iron layer when the solid reduced iron is melted into the molten iron; a carbonaceous material coating layer having the carbonaceous material is formed on the carbonaceous material suspending slag layer; and the molten iron and the slag stored in the melting furnace are tapped from a tap hole formed in a lower portion of a furnace wall of the melting furnace.

Method for manufacturing molten iron

To provide a rotary hearth furnace which has a simple furnace structure in which the furnace is not damaged even if the furnace is operated for a long term while presenting general equations capable of adequately determining a thermal expansion margin in the rotary hearth furnace.

Rotary hearth furnace

A method for manufacturing a reduced metal includes thermally reducing a metal oxide including a carbonaceous reductant disposed on a hearth moving in a reducing furnace, wherein the reducing furnace includes a plurality of primary burners for supplying fuel and primary combustion air, and a plurality of secondary combustion burners for supplying secondary combustion air; and wherein the primary combustion air and/or the secondary combustion air is oxygen-enriched air, the oxygen concentration in the primary combustion air supplied from at least one of the plurality of primary burners being controlled to be lower than the oxygen concentration in the secondary combustion air.

Method for manufacturing reduced metal

A system provides assistance in the delivery of industrial wastes from industrial waste-generating sites to one or more industrial waste treatment sites based on exchanged information on industrial wastes containing metal oxide. The system includes a server, terminals at the industrial waste-generating sites, and terminals at the industrial waste treatment sites. Each terminal at the industrial waste-generating site transmits the information on industrial wastes to the server. The server stores the transmitted formation into an information storage unit. The server receives the search conditions from one of the industrial waste treatment sites who require industrial wastes, search the information storage unit, and transmits the search result to the terminal at the corresponding industrial waste treatment site. The terminal at the industrial waste treatment site displays the search result.

Method and system for providing information on industrial wastes, server and terminal for providing the information, recording medium for recording computer-readable program, and program allowing computer to execute process

The prevent invention provides a method for producing a feed material for molten metal production and a method for producing a molten metal capable of sufficiently carbonizing biomass and effectively using carbonized biomass as a reducing agent. In the method for producing a feed material for molten metal production, a mixture containing an iron oxide-containing material and biomass is heated in a heating furnace substantially isolated from oxygen to carbonize the biomass in the mixture and obtain a feed material for molten metal production, or the mixture is charged in a reducing furnace to reduce the iron oxide-containing material after being heated in the heating furnace. In the method for producing a molten metal, the feed material for molten metal production obtained by the method for producing a feed material for molten metal production is charged in a melting furnace to obtain a molten metal.

Method for producing feed material for molten metal production and method for producing molten metal

A method of producing stainless steel includes the steps of melting a raw material in an electric furnace to form molten steel, and then refining the molten steel by a refining furnace to produce stainless steel in a stainless steel producing process. In the method, a carbonaceous reducing agent is added to a zinc-containing waste material produced in the stainless steel producing process, the resultant mixture is agglomerated by a briquette press to form agglomerates incorporated with a carbonaceous material, the agglomerates incorporated with the carbonaceous material are heated in a rotary hearth furnace to reduce and evaporate zinc to form dezincified agglomerates, and then the dezincified agglomerates are charged as a coolant in an oxidation period of the refining furnace.

Method of producing stainless steel by re-using waste material of stainless steel producing process

The present invention can provide a method for combustion treatment capable of efficiently treating combustible waste, and a combustion treatment apparatus capable of realizing such a method. The present invention can further provide a method for combustion treatment capable of efficiently treating even combustible waste containing a generation source of a volatile hazardous component, and a combustion treatment apparatus capable of realizing this. Furthermore, the present invention can provide a method for combustion treatment capable of efficiently recovering and making effective use of the heat of an exhaust gas discharged during a treatment of combustible waste, and a combustion treatment apparatus capable of realizing this. The aforementioned method for combustion treatment is a method for treating combustible waste, in which the combustible waste is subjected to combustion treatment in a rotary hearth furnace.

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Kobe, Japan

Hiroshi Sugitatsu