Method of furnace operation with high pellet burdens

Details Method of furnace operation with high pellet burdens Method of furnace operation with high pellet burdens

1982-08-09

1984-03-13

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

C21B 500

Patent

active

044365527

ABSTRACT:
A method is described for producing metal such as iron in a shaft furnace wherein greater than about 80 percent of the ore therein is present in the form of pellets. The improvement involves adding fine ore material to the furnace adjacent to the walls of the furnace, and wherein the fine material is sufficiently fine to reduce the gas flow and protect the furnace lining. Preferably the fine ore material is obtained by separation from the pellets, and is added to the furnace on a controlled basis. Subsequent to separating the fine ore material from the pellets and prior to adding it to the furnace, the ultrafine fraction which would either create material handling problems or be blown out of the furnace when introduced is either (1) separated from the fine fraction which is added to the furnace, or (2) micro-pelletized prior to addition to the furnace in order to provide a material having suitable properties for flowing into the furnace.

REFERENCES:
patent: 1945341 (1934-01-01), Brassert
patent: 4129437 (1978-12-01), Taguchi et al.
Poreromo, "Blast Furnace Burden & Gas Distribution", I & S M, Jul. 1979, pp. 22-34.

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