Process for generating heat and producing sponge iron

Details Process for generating heat and producing sponge iron Process for generating heat and producing sponge iron

1985-07-31

1987-06-30

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

432106, 266160, 266173, C21B 1308

Patent

active

046768246

ABSTRACT:
Sponge iron is produced by a direct reduction of iron oxide containing materials in a rotary kiln, the material discharged from the rotary kiln is separated into sponge iron and material which contains surplus carbon, the carbon-containing material is burnt in a fluidized bed reactor containing a circulating fluidized bed, and the heat generated by the combustion is recovered and utilized to produce electric power. To ensure a utilization of the surplus energies of the rotary kiln process and to minimize the contents of SO.sub.2, NO.sub.X, and CaS, the dust-containing exhaust gas from the rotary kiln is supplied to the fluidized bed reactor and is afterburnt therein, at least a major part of all oxygen-containing gases supplied to the fluidized bed reactor is supplied as a fluidizing gas to the lower portion of the fluidized bed reactor, the combustion of the combustible constituents is effected with an over-stoichiometric oxygen content, and the solids entrained by the gases discharged from the fluidized bed reactor are recycled to the fluidized bed reactor in such a manner that the weight of solids circulated per hour is at least 5 times the weight of the solids contained in the fluidized bed reactor.

REFERENCES:
patent: 3918958 (1975-11-01), Heitmann
patent: 3985544 (1976-10-01), Collin et al.
patent: 4111158 (1978-09-01), Reh et al.
patent: 4165717 (1979-08-01), Reh et al.
patent: 4415357 (1983-11-01), Bauer
patent: 4490168 (1984-12-01), Formanek et al.
patent: 4539188 (1985-09-01), Hirsch et al.

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