Method for producing sintered ore
US-2023085232-A1 · Mar 16, 2023 · US
Method for producing sintered ore
US12404566B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12404566-B2 |
| Application number | US-202117801141-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 22, 2021 |
| Priority date | Feb 27, 2020 |
| Publication date | Sep 2, 2025 |
| Grant date | Sep 2, 2025 |
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- Title
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Abstract
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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
First claim
Opening claim text (preview).
The invention claimed is: 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. 2. The method for producing sintered ore according to claim 1 , wherein oxygen enrichment is not performed before 4 minutes have elapsed after the upper surface of the charged layer is ignited. 3. The method for producing sintered ore according to claim 1 , wherein the method is not used in combination with an exhaust gas recirculation process. 4. The method for producing sintered ore according to claim 1 , wherein the oxygen concentration of the oxygen-enriched air to be introduced onto the raw material charged layer is more than 25 vol. %.
Assignees
Inventors
Classifications
Conditioning, transformation of reduced iron ores · CPC title
Reduction of iron ores by passing through a heated column of carbon · CPC title
Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction · CPC title
On a massing grate · CPC title
in a continuous way by reduction from ores · CPC title
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- What does patent US12404566B2 cover?
- 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 mate…
- Who is the assignee on this patent?
- Jfe Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C22B1/18. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 02 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).