C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/11
C22B 1/245 (2006.01) C22B 1/24 (2006.01)
Patent
CA 1099518
ABSTRACT OF THE DISCLOSURE This invention relates to fired iron-ore pellets and a process for producing the same. The process includes the steps of: crushing iron ore to be pelletized; adding carbonace- ous materials of grain sizes of 0.1 to 3 mm in diameter to the thus crushed iron ore in an amount of up to 4% by weight for mixing therewith; pelletizing a mixture thus prepared; and firing the pellets thus obtained; thereby providing pellets, in each of which there are intentionally dispersed macro-pores of sizes of 0.1 to 0.3 mm in diameter, at a ratio of up to 25% to the entire pores contained therein. Pellets produced by this process demonstrate superior properties in both high temperatures and in non-temperatures and have a high gas efficiency as well as being free of retardation of reduction even in an elevated tempera- ture range in a blast furnace. These pellets are also free of the softening and sticking phenomena found in the prior art thereby improving the productivity of the blast furnace and reducing the coke ratio.
273060
Fujita Isao
Kawaguchi Fumikazu
Onoda Mamoru
Takenaka Yoshimichi
Tsutaya Tadao
George H. Riches And Associates
Kobe Steel Ltd.
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