Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1994-08-12
1995-09-05
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75496, 75627, 75629, 266 99, 266156, C21B 1302
Patent
active
054475511
ABSTRACT:
An improved method and apparatus for forming metallized iron by direct reduction of particulate iron oxide is disclosed. Spent reducing gas is recycled from the reduction furnace through a cooler-scrubber and a catalyst-containing stoichiometric gas reformer. Upon removing the process gas from the cooler-scrubber, it is contacted with a chlorine dioxide spray, then compressed and cooled, the sulfur compound removed, and the process gas recycled either into the furnace cooling zone, or directly into the reformer, or divided and directed into both uses. Thus, most of the sulfur containing components of the spent reducing gas are removed, thereby reducing the sulfur contamination of the gas reformer catalyst. Reducing sulfur contamination of the gas reformer catalyst improves the overall efficiency of the direct reduction process. Either high sulfur ores, or high sulfur process gas, or both can be utilized in the invented process.
REFERENCES:
patent: 5340378 (1994-08-01), Huestis
Huestis Allan C.
Sanzenbacher Charles W.
Andrews Melvyn
Dougherty Ralph H.
Georgetown Steel Corporation
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