Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1993-04-14
1995-07-11
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75501, 75958, C21B 1314
Patent
active
054317100
ABSTRACT:
A fine particle mixture of iron concentrate and pulverized flux is introduced into the upper portion of the vertical prereduction section of a sealed unitary vessel. Heated gas partially reduces the iron concentrate particles to form wustite which falls to the lower portion where it is melted to form fluid slag. The slag passes into the horizontal section of the vessel which is divided by a barrier into a reduction portion and an oxidation portion. In the reduction portion, pulverized coal and oxygen are introduced and iron oxide in the slag is reduced to iron. The entrained iron droplets in the slag are permitted to sediment in a quiescent zone where the slag is removed. The molten iron may be recovered or converted into steel by flowing through passages in the lower portion of the barrier into the oxidation portion where oxygen is introduced to remove C, Si, P and other impurities and to convert iron into steel or semi-steel. The final product and slag are separately removed from the oxidation portion. Exhaust gases, produced in the prereduction, reduction and oxidation steps, are recovered and used to generate power and optionally recycled as reducing gas for use in the prereduction section.
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