US 12,404,566 B2Granted

Method for producing sintered ore

AssigneeJfe Steel Corporation

InventorsKenta Takehara, Tetsuya Yamamoto, Takahide Higuchi

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Abstract

A method produces a high-strength sintered ore while maintaining a high production rate by performing appropriate oxygen enrichment at a position closer to an ore discharging section than an ignition position without using gaseous fuel in the operation of a sintering machine. In a method for producing sintered ore including sequentially combusting carbonaceous material in a sinter bed (raw material charged layer) in a DL sintering machine to sinter the mixed raw material, in performing oxygen enrichment from above the raw material charging layer on the sintering machine, the oxygen enrichment is performed at a position closer to the ore discharging section than the position where 4 minutes have passed since the upper surface of the charging layer was ignited

Claims4

Dependent claims

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.

Dependencies are inferred from the claim text.

Facts

Application: 17/801,141Filed 22 Feb 2021
Priority: JP 2020-03195327 Feb 2020
Published: US 2023/0085232 A116 Mar 2023
Granted: 2 Sep 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

C21B 13/0046
Making spongy iron or liquid steel, by direct processes: making metallised agglomerates or iron oxide
C22B 1/18
Sintering; Agglomerating: in sinter pots
C21B 13/004
Making spongy iron or liquid steel, by direct processes: in a continuous way by reduction from ores
C21B 13/0053
Making metallised agglomerates or iron oxide: on a massing grate