Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1986-03-17
1988-02-16
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
266193, C21B 1302, F27B 124
Patent
active
047253096
ABSTRACT:
A method and an apparatus for the gaseous reduction of particulate iron ores is disclosed, wherein the reduced ore, commonly called DRI (Direct Reduced Iron) or sponge iron, is treated in a vertical shaft moving bed furnace and discharged from said furnace in solid particulate form at high temperature, e.g. above 500.degree. C. The shaft furnace is of the type wherein a bed of particles descends by gravity through said furnace which has an upper section where ore pellets, lumps, or the like are reduced by reaction with a hot reducing gas, and a lower section of a downwardly tapering, preferably, in a generally conical shape, which converges to an outlet discharge orifice of smaller cross sectional area than the rest of said furnace. A heat-exchanging means, optionally combined with insulation, in contact with the external surface of the wall of said lower section permits control of the temperature of said wall, whereby solids-flow problems in the furnace are minimized, producing a smooth operation and the desired hot exit temperature of the discharged DRI all in a reactor of a practical foreshortened size.
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Flores-Verdugo Marco-Aurelio
Lopez-Gomez Ronald-Victor-Manuel
MacKay Patrick W.
Prieto-de-la-Fuente Raul
Andrews Melvyn J.
Hylsa, S.A.
S. Safford A. Thomas
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