Kawasaki Steel Corporation

Jfe Steel Corporation

Kanji Takeda

Yoshitaka Sawa

Tetsuya Yamamoto

Tetsuya Kikui

Tatsuya Ozawa

Natsuo Ishiwata

Hiroshi Itaya

Seiji Taguchi

Haruo Kato

Toshikazu Nakai

A method for discharging a reduced product produced on a movable hearth of a movable-hearth furnace uses a discharging device. The discharging device includes a removal unit for removing the reduced product from the movable hearth, a separation unit for separating the reduced product from a solid reductant, a leaving-returning unit for either leaving substances other than the reduced product on a solid reductant layer or returning the substances onto the solid reductant layer, and a discharge unit for discharging the reduced product to the outside of the movable-hearth furnace.

Method for discharging reduced product from a movable-hearth furnace and a discharging device

Traveling hearth furnace and an operating method thereof, which, when stacking a layer consisting of a mixture of oxides such as fine iron ore and a fine solid reducing material onto a horizontally traveling hearth and reducing the oxides through radiant heat transfer from above the hearth, is based on melting the reduction product in the course of up to a discharge port, and causing aggregation and separation of slag in from the reduction product, followed by solidifying the reducible material.

Rotary hearth furnace for reducing oxides, and method of operating the furnace

A mixed layer of fine ore and coal char and a layer of fine coal are stacked on a hearth in the form of separate layers from each other. The fine ore is reduced while fine coal is pyrolyzed to produce coal char. The produced coal char is used repeatedly.

Method of operating rotary hearth furnace for reducing oxides

With a solid fine reducing material containing hydrogen placed as a lower layer on a movable hearth, a powdered mixture of an oxide powder dominantly of a fine iron ore and a solid fine reducing material is stacked in layered arrangement, and subsequent reduction operation is performed.

Method of reducing iron oxide on a movable hearth furnace

A traveling hearth for producing reduced metal by charging and stacking a raw material containing a metal-containing material and a solid-reducing material on a horizontally moving hearth, arranged for disposing a solid-reducing material layer on the hearth, forming concave portions at the solid-reducing material surface, stacking the raw material on the surface of the solid-reducing material layer, reducing the raw material by at least once heating and melting the material on the hearth to separate metal and gangue and ash ingredients, and discharging metal from the hearth.

Method of producing a reduced metal, and traveling hearth furnace for producing same

Rotary hearth furnace and method of operating the same

Producing reduced metal by charging and stacking a raw material containing a metal-containing material and a solid reducing material on a horizontally moving hearth of a traveling hearth furnace, by disposing a solid reducing material layer on the hearth, forming concave portions at the solid reducing material surface, stacking the raw material on the surface of the solid reducing material layer, reducing raw material by at least once heating and melting the material on the hearth to separate metal and gangue and ash ingredients, and discharging metal from the hearth.

Method of producing a reduced metal, and traveling hearth furnace for

A method and a device for monitoring combustion conditions in a metallurgical furnace which is effective and simple in structure and can provide a wide monitoring range of high accuracy. The combustion conditions in the furnace are monitored by a probe lying oblique to the axis of the blow pipe. Toward this end, the probe is inserted into the furnace through a tuyere. The tuyere has a through opening admitting the probe and allows the probe in an orientation oblique to the radii of the blow pipe.

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Chiba, Japan

Kanji Takeda