Blast furnace operation method
US-9873923-B2 · Jan 23, 2018 · US
Method for operation of blast furnace
US12565688B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12565688-B2 |
| Application number | US-202017598044-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 26, 2020 |
| Priority date | Mar 28, 2019 |
| Publication date | Mar 3, 2026 |
| Grant date | Mar 3, 2026 |
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Abstract
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A method for a blast furnace includes pulverizing coal to make pulverized coal, and pulverizing iron ore to make pulverized iron ore, and injecting the pulverized coal and the pulverized iron ore from a tuyere. A loss on ignition of the iron ore is greater than or equal to 9% by mass and less than or equal to 12% by mass, an injection rate of the pulverized coal is greater than or equal to 150 kg/tp, and an injection rate of the pulverized iron ore is greater than or equal to 2.5 kg/tp and less than or equal to 50.0 kg/tp.
First claim
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The invention claimed is: 1 . A method for operation of a blast furnace, the method comprising: pulverizing coal to make pulverized coal, and pulverizing iron ore to make pulverized iron ore; and injecting the pulverized coal and the pulverized iron ore together from a tuyere, wherein a loss on ignition of the iron ore is greater than or equal to 9% by mass and less than or equal to 12% by mass, wherein an injection rate of the pulverized coal is greater than or equal to 150 kg/tp, wherein an injection rate of the pulverized iron ore is greater than or equal to 2.5 kg/tp and less than or equal to 50.0 kg/tp, wherein the pulverized coal and the pulverized iron ore, each have a maximum grain size of less than or equal to 1,000 μm, wherein a Hardgrove Index of the coal to be pulverized is greater than or equal to 40 and less than or equal to 90, wherein the pulverized coal comprises ash comprising 50% by mass or more and 60% by mass or less SiO 2 , and 20% by mass or more and 30% by mass or less Al 2 O 3 , wherein a grain size of each of the pulverized coal is equivalent to a grain size of the pulverized iron ore, and wherein a pressure loss of the blast furnace reduces in comparison to a pressure loss before the injection of the pulverized iron at said injection rate; and a pressure loss change amount of the blast furnace becomes negative. 2 . The method according to claim 1 , characterized in that the iron ore and the coal are pulverized together.
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- What does patent US12565688B2 cover?
- A method for a blast furnace includes pulverizing coal to make pulverized coal, and pulverizing iron ore to make pulverized iron ore, and injecting the pulverized coal and the pulverized iron ore from a tuyere. A loss on ignition of the iron ore is greater than or equal to 9% by mass and less than or equal to 12% by mass, an injection rate of the pulverized coal is greater than or equal to 150 …
- Who is the assignee on this patent?
- Kobe Steel Ltd
- What technology area does this patent fall under?
- Primary CPC classification C21B5/003. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 03 2026 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).