US 12,404,566 B2
Method for producing sintered ore
Kenta Takehara, Tokyo (JP); Tetsuya Yamamoto, Tokyo (JP); and Takahide Higuchi, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/801,141
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Feb. 22, 2021, PCT No. PCT/JP2021/006552
§ 371(c)(1), (2) Date Aug. 19, 2022,
PCT Pub. No. WO2021/172254, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 2020-031953 (JP), filed on Feb. 27, 2020.
Prior Publication US 2023/0085232 A1, Mar. 16, 2023
Int. Cl. C22B 1/18 (2006.01); C21B 13/00 (2006.01)
CPC C22B 1/18 (2013.01) [C21B 13/0086 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for producing sintered ore comprising charging mixed raw material for sintering containing iron ore and carbonaceous material into a raw material ore charging section on a pallet that circulates in a sintering machine to thus form a raw material charged layer,
igniting the carbonaceous material on an upper surface (upper layer part) of the raw material charged layer by an ignition furnace disposed downstream of the raw material ore charging section while sucking gas above the raw material charged layer through a wind box disposed below the pallet, and
introducing the gas into the raw material charged layer to sequentially ignite the carbonaceous material in the raw material charged layer and thus sinter the mixed material, wherein
in performing oxygen enrichment from above the raw material charged layer on the sintering machine, the oxygen enrichment is performed for a duration of 1 to 7 minutes during a period of time starting 5.8 minutes after the upper surface of the charged layer is ignited, and the oxygen enrichment is completed within 13 minutes after the raw material charged layer is ignited.