Kabushiki Kaisha Kobe Seiko Sho

Kobe Steel, Ltd.

Shinichi Inaba

Isao Kobayashi

Masataka Shimizu

Shoichi Kikuchi

Shuzo Ito

Akira Uragami

Osamu Tsuchiya

Yoshimichi Takenaka

Takuya Negami

Toshihide Matsumura

Kimio Sugiyama

Kazuo Kunii

Takashi Kujirai

Kiichi Narita

Masakata Shimizu

Yoshio Kimura

Tsunao Kamijo

Ryuichi Hori

Fumio Noma

Mitsutoshi Isobe

Kenichi Okimoto

A method of making metallic iron in which a compact, containing iron oxide such as iron ore or the like and a carbonaceous reductant such as coal or the like, is used as material, and the iron oxide is reduced through the application of heat, thereby making metallic iron. In the course of this reduction, a shell composed of metallic iron is generated and grown on the surface of the compact, and slag aggregates inside the shell. This reduction continues until substantially no iron oxide is present within the metallic iron shell. Subsequently, heating is further performed to melt the metallic iron and slag. Molten metallic iron and molten slag are separated one from the other, thereby obtaining metallic iron with a relatively high metallization ratio. Through the employment of an apparatus for making metallic iron of the present invention, the above-described method is efficiently carried out, and metallic iron having a high iron purity can be made continuously as well as productively not only from iron oxide having a high iron content but also from iron oxide having a relatively low iron content.

Method and apparatus for making metallic iron

Metallic iron containing slag

Disclosed herein is a method for operating blast furnace, wherein, when charging coke and ore alternately from the furnace top to form alternate coke and ore layers for operation of a blast furnace, a coke layer is formed by charging coke of properties especially suitable for improvement of gas and liquid permeability of the coke layer to the central part thereof or an ore layer is formed by charging ordinary versatile type coke to the central part of the ore layer prior to formation thereof. The centrally charged coke forms a major part of the dead coke layer which is sequentially renewed under the cohesive zone of the blast furnace to maintain appropriate gas and liquid permeability of the dead coke layer, thereby enhancing the production efficiency and stability of the blast furnace operation while suppressing erosive wear of refractory walls of the furnace.

Method for operating blast furnace by adding solid reducing agent

A method for estimating the geographical distribution of a cohesive zone in a blast furnace which is intermittently charged with an iron ore material to produce molten iron substantially in a continuous manner is disclosed. The method comprises altering the whole or part of the composition of the charging iron ore material at a certain time point, measuring variations in the composition of produced molten iron ore slag over a given time period, and estimating the shape of the cohesive zone in the furnace on the basis of a pattern of variation of one selected component and the speed of gravitational descent of the charged material through the furnace.

Method for estimating geographical distribution of cohesive zone in

Growing community of inventors

Kakogawa, Japan

Shinichi Inaba