2-stage fluidized bed type fine iron ore reducing apparatus, and reducing method using the apparatus
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United States of America Patent
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Dec 10, 2002
Grant Date -
N/A
app pub date -
Feb 20, 2001
filing date -
Jun 21, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A two-stage fluidized bed reducing apparatus and a reducing method for fine iron ore of a wide particle size distribution with an increased degree of utilization of the reducing gas. Fine iron particles dropping through the holes of a gas distributor can be recycled into the fluidized bed furnace, thereby preventing an impediment of the reducing gas flow due to abnormal defluidizing or channeling. A first fluidized bed furnace dries, pre-heats and pre-reduces the fine iron ore, and a second fluidized bed furnace finally reduces the pre-reduced iron ore. Downstream of the respective fluidized beds are installed intermediate hoppers and gas/solid sealing valves. Thus, the fine iron ore particles which drop through the holes of gas distributors during the abnormal operation are recycled to the furnaces. Accordingly, the gas flow is not impeded.
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