Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1985-10-11
1989-08-08
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 38, 75 40, 75 91, 266160, C21B 1100, C21B 1302
Patent
active
048549673
ABSTRACT:
A process for producing sponge iron from iron ore is described, which is reduced to sponge iron in a reduction shaft furnace by means of a hot reduction gas. For this purpose reduction gas at a temperature in the range 750 to 900.degree. C. is introduced into shaft furnace (1) level with bustle plane (5) having been produced in a gasifier (2) then cooled and purified in a cyclone separator (12). Reduction gas is introduced below the bustle plane (5) at a temperature below that of the reduction gas introduced in the bustle plane and is preferably introduced into the shaft furnace (1) between 650.degree. and 750.degree. C. Increased carburization of the sponge iron is obtained. Increased carbon separation also results through a volume increase, particularly by increasing the cross-section through the lower part of the shaft furnace. Carburization is also assisted in that the ratio of the reduction gas quantity supplied below the bustle plane is made as large as possible compared with the reduction gas quantity supplied in the bustle plane.
REFERENCES:
patent: 3511643 (1970-05-01), Vallak et al.
patent: 4268303 (1981-05-01), Kaneko et al.
patent: 4584016 (1986-04-01), Becerra Novoa et al.
Andrews Melvyn J.
Korf Engineering GmbH
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