Self-fluxing pellets to be charged into blast furnace, and metho

Details Self-fluxing pellets to be charged into blast furnace, and metho Self-fluxing pellets to be charged into blast furnace, and metho

1991-04-01

1992-07-07

Kastler, Scott

Specialized metallurgical processes, compositions for use therei

Compositions

Solid treating composition for liquid metal or charge

75768, C21C 116

Patent

active

051279401

ABSTRACT:
Disclosed herein is a self-fluxing pellet to be charged into blast furnace, the pellets containing open pores of diameters larger than 5 .mu.m in an amount greater than 0.045 cm.sup.3 /g. Calcium.ferrite structures with a thickness of 100 .mu.m or greater exist around pores of diameters larger than 5 .mu.m including the open pores. The self-fluxing pellets as a whole has a CaO/SiO.sub.2 value higher than 0.8. For forming the self-fluxing pellets, at least one of coarse dolomite and limestone having a particle size of 44 .mu.m-1 mm is added as a pellet material to powdery iron ore. The green pellet formed from the resulting powdery mixture are sintered at a temperature of 1220.degree. C.-1300.degree. C. to have a CaO/SiO.sub.2 value higher than 0.8 after sintering.

REFERENCES:
patent: 4257806 (1981-03-01), Fujita et al.
patent: 4326887 (1982-04-01), McAllister et al.
patent: 4350523 (1982-09-01), Taguchi et al.

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