Sintered Ore Production Method

Abstract: This sintered ore production method comprises: a step for forming a lower-stage raw-material-filled layer (10) by charging a lower-stage blended granular raw material into a sintering machine (100); a step for forming an upper-stage raw-material-filled layer(20) by charging an upper-stage blended granular raw material on the lower-stage raw-material-filled layer; a step for igniting the surface of the lower-stage raw-material-filled layer and the surface of the upper-stage raw-material-filled layer, respectively, and introducing an oxygen-containing gas into the lower-stage raw-material-filled layer and the upper-stage raw-material-filled layer through downward-suctioning (6) under atmospheric pressure. At least a portion of the gas suctioned downward from the surface side of the upper-stage raw-material-filled layer after the completion of ignition of the upper-stage raw-material-filled layer is made to be an oxygen-enriched gas with an oxygen concentration of 26 vol% to 46 vol%. A region in which the oxygen-enriched gas is supplied is a region including a part of a first half section, when in the longitudinal direction of the sintering machine, a middle position of a section from immediately after an outlet (X) of an upper-stage ignition furnace (2C) to an ore discharge end (Y) is defined as a middle position (Z), and a section from immediately after the outlet (X) of the upper-stage ignition furnace to the middle position (Z) is defined as the first half section.

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