Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1978-05-11
1979-12-18
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C21B 1300
Patent
active
041792823
ABSTRACT:
A method for the production of sponge metal by the gaseous reduction of metal oxides in iron ore to sponge iron, wherein metal oxided iron ore is initially preheated to or near reduction with a hot oxygen-free gas stream produced by the combustion of a fuel with no more than a stoichiometric amount of an oxygen-containing gas. The preheated ore is then reduced by contact with a hot reducing gas stream which has been preheated by intimate mixing with a hot oxygen-free heating gas stream. The hot oxygen-free gas stream is produced by the combustion of a fuel with no more than a stoichiometric amount of an oxygen-containing gas. The intimate mixing of the reducing gas and the oxygen-free heating gas rapidly raises the temperature of the reducing gas without depleting any reducing components thereof before the heated reducing gas is passed over the oxided iron ore. The resulting body of reduced sponge metal is then cooled with a cool gas stream which, in a preferred embodiment, is provided by circulating a portion of effluent gas from the preheating step and/or the reducing step.
REFERENCES:
patent: 2900247 (1959-08-01), Celada
patent: 3128174 (1964-04-01), Celada
Andrews M. J.
CVG-Siderurgica del Orinoco, C.A.
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