Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

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

Mitsubishi Denki Kabushiki Kaisha

Other

Kabushiki Kaisha Seiko Sho

Hidetoshi Tanaka

Takao Harada

Hiroshi Sugitatsu

Isao Kobayashi

Takeshi Sugiyama

Shoichi Kikuchi

Osamu Tsuchiya

Itsuo Miyahara

Kojiro Fuji

Yasuhiko Igawa

Jun Jimbo

Takuo Shigehisa

Masahiko Tetsumoto

Makoto Nishimura

Sumito Hashimoto

Shoji Shirouchi

Yoshimichi Takenaka

Noriyuki Okuyama

Masataka Tateishi

Koichi Matsushita

Kiminori Hajika

Tadashi Yaso

Toshiyuki Kurakake

Wakasa Kise

Yoshihito Hirano

Hiroshi Uemura

Shumpei Kameyama

Koji Tokuda

Shuzo Ito

Shusou Wadaka

Kazuya Miyagawa

Hideaki Fujimoto

Takao Umeki

Haruhisa Iwakiri

Shunpei Kameyama

Teruhisa Uehara

Koichi Morioka

Hiroshi Tamazawa

Yoshiyuki Matsui

Masaaki Atsushi

Takaya Kitajima

Masaharu Kohno

Nobuyuki Iwasaki

Tadashi Ueda

Takeshi Maki

Niroyuki Okuyama

The present invention provides a method for producing a high-quality reduced metal using an upgraded coal as a carbonaceous material to be incorporated. In the method, coal is first aged by heating in an organic solvent to produce upgraded coal for metallurgy having higher thermal plasticity than that of the coal. Then, a mixture of the upgraded coal for metallurgy and a metal oxide-containing raw material is agglomerated by an agglomerator, and the resultant agglomerates are reduced by heating in a furnace and then melted by further heating to produce a reduced melt. The reduced melt is cooled and solidified in the furnace to produce a reduced solid. The reduced solid is discharged to the outside of the furnace and slag is removed using a screen to recover a metal as a reduced metal.

Method for producing reduced metal and slag containing oxidized nonferrous metal using an upgraded coal

The present invention is directed to providing a production method capable of producing carbon composite briquettes having sufficient strength without excessively reducing a production capacity, even using steel mill dust containing oil. This method comprises: adding at least a carbonaceous material and a binder to steel mill dust containing oil and mixing them to form a powdery mixture; compacting the powdery mixture by means of a pressure roll to produce briquettes; and recognizing an increase/decrease in an oil content of the powdery mixture to adjust a rotation speed of the pressure roll so as to lower the rotation speed along with an increase in the oil content.

Method of producing carbonaceous material-containing briquettes using steel mill dust containing oil

Hot briquette iron includes a plurality of reduced iron particles which are bonded to each other by hot forming, wherein the reduced iron particles each have a surface region having an average carbon content of 0.1 to 2.5% by mass and a central region positioned inside the surface region and having an average carbon content higher than that of the surface region.

Hot briquette iron and method for producing the same

A process for producing molten iron with a combination of a moving-hearth reducing furnace and an iron bath-type melting furnace that includes charging a bedding carbonaceous material on a hearth of the moving-hearth reducing furnace and placing carbonaceous material-containing agglomerates containing a powdery iron oxide source and a powdery carbonaceous reductant on the bedding carbonaceous material; thermally reducing the carbonaceous material-containing agglomerates while moving the hearth in the moving-hearth reducing furnace to generate solid reduced iron and simultaneously thermally carbonizing the bedding carbonaceous material to generate char; hot-forming the solid reduced iron and the char into agglomerates without substantial cooling; continuously charging the agglomerates into the iron bath-type melting furnace from thereabove; and blowing oxygen-containing gas into the iron bath-type melting furnace to melt the solid reduced iron and to thereby generate molten iron.

Process for producing molten iron and apparatus 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

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

The disclosure relates to improvements of technology for producing metallic iron by thermally reducing an iron source such as iron ore with a carbonaceous reductant such as coke by including efficiently reducing iron oxides into metallic iron at a lower operation temperature while conducting carburization, and efficiently separating the generated metallic iron from slag-forming components such as gangue components contained in raw material ore whereby metallic iron with controlled carbon concentrations can be produced in high yield.

The present invention provides a method for upgrading low-rank coal unsuitable for production of a reduced metal by a conventional carbon composite method to produce an upgraded coal suitable for the carbon composite method. The prevent invention also provides a method for producing a high-quality reduced metal using the upgraded coal as a carbonaceous material to be incorporated. In these methods, coal is first aged by heating in an organic solvent to produce upgraded coal for metallurgy having higher thermal plasticity than that of the coal. Then, a mixture of the upgraded coal for metallurgy and a metal oxide-containing raw material is agglomerated by an agglomerator, and the resultant agglomerates are reduced by heating in a moving hearth furnace and then melted by further heating to produce a reduced melt. The reduced melt is cooled and solidified in the moving hearth furnace to produce a reduced solid, and then the reduced solid is discharged to the outside of the furnace. Then, a slag is removed using a screen to recover a metal as a reduced metal.

Method for producing improved coal for use in metallurgy, and method for producing reduced metal and slag containing oxidized nonferrous metal

Agglomerates with a carbonaceous material incorporated therein and a process for producing reduced metal using the agglomerates are provided. The agglomerates are prepared with high-VM coal, which is widely and abundantly produced and is less expensive, and they provide high strength after reduction without the need for finer metal oxide particles. The agglomerates are made of a carbonaceous material and a raw material to be reduced that contains a metal oxide, such as iron ore. The carbonaceous material used is a high-VM coal containing 35% or more by mass of volatile matter. The agglomerates are formed at a pressure of at least 2 t/cmso that the porosity thereof is reduced to 35% or less. The reduction in porosity is effective in promoting heat transfer inside the agglomerates in a rotary hearth furnace in a high-temperature reduction step so that the sintering of reduced metal proceeds efficiently in the overall regions of the agglomerates to produce a reduced metal having high crushing strength.

Process for producing reduced metal and agglomerate with carbonaceous material incorporated therein

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 method for producing an iron oxide pellet including the steps of adding water to a raw material mixture comprising iron oxide which serves as a primary component, a carbonaceous material in an amount sufficient for reducing the iron oxide, an organic binder in an amount sufficient for binding the iron oxide and the carbonaceous material, and an inorganic coagulant in an amount of not less than 0.05 mass % and less than 1 mass %; pelletizing the resultant mixture to thereby obtain a green pellet; and drying the green pellet until the moisture content is reduced to equal to or less than 1.0 mass %. The thus-produced iron oxide pellet is charged in a reducing furnace for reduction to thereby obtain a reduced iron pellet.

Method of producing iron oxide pellets

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 for making molten iron includes the steps of feeding a raw material mixture containing an iron oxide material and a carbonaceous reductant into a heating reduction furnace to reduce iron oxide in the raw material mixture with the carbonaceous reductant into solid reduced iron; transporting the solid reduced iron to a melting furnace; and combustion of a carbonaceous material supplied as fuel to melt the solid reduced iron in the melting furnace for producing molten iron. After the metallization of the solid reduced iron is enhanced to at least 60%, the solid reduced iron is transported to the melting furnace. The amounts of oxygen and the carbonaceous material supplied to the melting furnace are controlled so that the secondary combustion ratio of CO gas in the melting furnace is reduced to 40% or less. The heat transfer efficiency of the secondary combustion heat to the molten iron is preferably increased to at least 60%.

Process for producing molten iron

A method for making reduced iron using blast-furnace sludge is provided. The method includes a mixing step of mixing the blast-furnace sludge and an iron-oxide-containing powder to prepare a mixed material, an agglomerating step of agglomerating the mixed material to form agglomerates, a feeding step of feeding the agglomerates onto a continuously moving hearth, and a reducing step of heating the agglomerates to remove zinc and reduce the agglomerates.

Method for making reduced iron

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Kobe, Japan

Hidetoshi Tanaka