Method for coating iron-bearing particles to be processed in a direct reduction process
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United States of America Patent
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-
Jan 26, 1993
Grant Date -
N/A
app pub date -
Jan 14, 1991
filing date -
Jan 14, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
At least a percentage of iron ore pellets and the like for use in a direct reduction process for the production of sponge iron are coated with a thin porous coating of Portland cement to counteract tendency to aggregate. This is accomplished by method and apparatus that mixes water and cement powder at the point of delivery in a manner such that no pumps are subjected to a wet cement slurry. The slurry is mixed and maintained in suspension by air agitation in a bin and then flowed through a bin discharge pipe and sprayed therefrom onto a passing layer of pellets in a controlled manner by regulated air injection into the discharage pipe.
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