Partially-reduced iron producing method and partially-reduced iron producing apparatus
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United States of America Patent
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Feb 24, 2015
Grant Date -
Jun 6, 2013
app pub date -
Dec 4, 2012
filing date -
Dec 5, 2011
priority date (Note) -
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Abstract
A reduction furnace includes a pellet material supplying device forming on a grate an ignition carbon material layer having a predetermined height; an ignition device; and an exhaust gas circulation device supplying an oxygen-containing gas comprising circulated exhaust gas mixed with air, to a packed bed of the pellets heated by a combustion heat of the ignition carbon material layer. A partially-reduced iron is produced by thermally reducing the pellets through a combustion region for the ignition carbon material layer and a heating region, the combustion region formed upstream in a travelling direction of the grate by supplying a gas having a high oxygen concentration, the heating region formed downstream of the combustion region by supplying a gas having a low oxygen concentration.
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