Rotary bed-type electric furnace
US-10746467-B2 · Aug 18, 2020 · US
Production method of granular metallic iron
US2017073781A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2017073781-A1 |
| Application number | US-201515310483-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 13, 2015 |
| Priority date | May 15, 2014 |
| Publication date | Mar 16, 2017 |
| Grant date | — |
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Abstract
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This method is for producing granular metallic iron in which the relation between the mass ratio (mass %) of the volatile matter content contained in a carbonaceous reducing agent and the average gas flow rate (m/s) of the ambient gas in a heating furnace fulfills expression (1). Mass ratio of volatile matter content≦−4.62×average gas flow rate+46.7 . . . (1)
First claim
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1 . A method for producing granular metallic iron, the method comprising: agglomerating a mixture comprising an iron oxide-containing material and a carbonaceous reducing agent; charging a resulting agglomerate onto a hearth of a heating furnace and heating it, thereby reducing iron oxide in the agglomerate; and melting reduced iron by further heating to cause the reduced iron to coalesce, thereby producing granular metallic iron, wherein, when the agglomerate is heated on the hearth of the heating furnace, a relationship between a mass ratio (% by mass) of a volatile matter contained in the carbonaceous reducing agent and an average gas flow rate (m/sec) of an atmospheric gas in the heating furnace satisfies formula (1): Mass ratio of volatile matter≦−4.62×average gas flow rate+46.7 (1). 2 . The method according to claim 1 , wherein a value (oxygen amount/fixed carbon amount) obtained by dividing an oxygen amount (% by mass) derived from the iron oxide-containing material included in the agglomerate by a fixed carbon amount (% by mass) derived from the carbonaceous reducing agent included in the agglomerate is from 1.46 to 2.67. 3 . The method according to claim 1 , wherein the mixture further comprises a melting-point controlling agent. 4 . The method according to claim 2 , wherein the mixture further comprises a melting-point controlling agent.
Assignees
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Classifications
Rotary hearth-type furnaces · CPC title
Binding; Briquetting {; Granulating} · CPC title
Particular sequence of the process steps · CPC title
- C21B13/12Primary
in electric furnaces · CPC title
- C21B13/0053Primary
On a massing grate · CPC title
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- What does patent US2017073781A1 cover?
- This method is for producing granular metallic iron in which the relation between the mass ratio (mass %) of the volatile matter content contained in a carbonaceous reducing agent and the average gas flow rate (m/s) of the ambient gas in a heating furnace fulfills expression (1). Mass ratio of volatile matter content≦−4.62×average gas flow rate+46.7 . . . (1)
- Who is the assignee on this patent?
- Kobe Steel Ltd
- What technology area does this patent fall under?
- Primary CPC classification C21B13/12. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Mar 16 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).