Direct iron and steelmaking

Details Direct iron and steelmaking Direct iron and steelmaking

1994-09-21

1996-08-06

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Process control responsive to sensed condition

75476, C21B 1308

Patent

active

055429637

ABSTRACT:
The process of the invention comprises gaseous reduction of iron oxides in solid state combined with concurrent melting of the hot reduced iron within a closed system without cooling down the charge or exposing it to the outside atmosphere. It incorporates the continuous recycling of a major portion of the off-gases from reduction, and fully utilizes the chemical heat contained in the fuel and reductant by substantially complete oxidation to CO.sub.2 and H.sub.2 O in the system gaseous reaction products and recovery of their sensible heat, prior to final exhaustion as waste gases. Features include dewatering of the off-gas from reduction, enriching with hydrocarbon and recycling a major portion, and separately combusting a minor portion for transfer of the sensible heat to the enriched major portion, and also usually the combustion of a second minor portion with oxygen as fuel for melting, with the sensible heat of these combustion products also utilized for heating the enriched and recycled portion. The reduction stage is suitably conducted in a gas-solid reaction zone within a shaft furnace, and the melting in a gas-solid-liquid reaction zone within a rotary furnace which also contains a gas-liquid reaction zone adapted for controlling of the liquid iron temperature and composition. Supplemental materials such as iron and steel scrap, alloys and fluxes may be added directly into the rotary furnace, and the product may be discharged either batch-wise or continuously be siphon into an evacuated withdrawal chamber for final alloying and refining prior to casting.

REFERENCES:
patent: 3514280 (1970-05-01), Sherwood

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