Kobe Steel, Ltd.

Tadao Tsutaya

Isao Fujita

Mamoru Onoda

Fumikazu Kawaguchi

Yoshimichi Takenaka

Ryo Watanabe

Nobuyuki Imanishi

Takao Kawai

Yoshimichi Takenake

The present invention discloses a blast-furnace operation method which comprises selecting three factors, i.e. the oxygen volume in blast, the ore/coke and the reducibility of the burden materials as control factors from among these which participate in the variation of heat input and heat output of blast furnace, plotting values of these three factors obtained from the practical operation of efficient blast furnaces on a graph consisting of three parallel axes indicating the three factors, evaluating the conditions of furnace heat with reference to a balanced state of the three plotted factors and adjusting one or more of the three factors in the furnace so all will lie within a suitable range thereby balancing the furnace heat.

Blast-furnace operation method

Fired iron-ore pellets are disclosed which are prepared by crushing iron ore to be pelletized, mixing a carbonaceous material of grain sizes ranging from 0.1 to 3 mm in diameter to the crushed iron ore in an amount of up to 4% by weight, pelletizing the mixture thus prepared, and firing the resulting pellets; thereby providing pellets throughout each of which is dispersed macro-pores of sizes ranging from 0.1 to 3 mm in diameter at a ratio of up to 25% relative to all pores contained in each pellet.

Fired iron-ore pellets having macro pores and process for producing the

Fired iron-ore pellets having macro pores

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Kobe, Japan

Tadao Tsutaya