Method and apparatus for reducing iron-oxides-particles having a broad range of sizes
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United States of America Patent
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Oct 17, 2000
Grant Date -
N/A
app pub date -
Oct 2, 1998
filing date -
Jul 6, 1998
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Abstract
The present invention describes a method and apparatus for the reduction into metallic iron of iron-oxides-containing particles having a broad range of sizes. Particles, preferably within a broad range of sizes smaller than about 3.2 mm, are reduced by contact with a hot reducing gas, preferably mainly composed of hydrogen and within a temperature range of 700 to 750.degree. C. The reducing gas flows through a descending moving bed of coarser particles and forms an ascending fluidized bed of fines, all in a single reduction reactor, where the particles charged to the reactor are fed into the lower portion of the fluidized bed and the reduced fines are withdrawn from the reactor from the upper portion of the fluidized bed.
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