Method for producing hematite for ironmaking
US-10125025-B2 · Nov 13, 2018 · US
Method for producing granular metallic iron
US2017283905A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2017283905-A1 |
| Application number | US-201515509729-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 3, 2015 |
| Priority date | Sep 10, 2014 |
| Publication date | Oct 5, 2017 |
| Grant date | — |
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Abstract
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A method for producing granular metallic iron of the present invention includes: an agglomeration step of obtaining agglomerates through agglomeration of a mixture that contains an iron oxide-containing material and a carbonaceous reducing agent; and a granulation step of obtaining granular metallic iron by heating the agglomerates, reducing iron oxides in the agglomerates, aggregating generated metallic iron to be granular while separating the metallic iron from slag generated as a by-product, and thereafter cooling and solidifying the metallic iron, wherein agglomerates satisfying all the conditions given by formulas (1) to (3) below are used as the agglomerates: (1) [(total CaO amount+total SiO 2 amount+total Al 2 O 3 amount)/total Fe amount]≧0.250; (2) (total CaO amount/total SiO 2 amount)≧0.9; (3) [total Al 2 O 3 amount/(total CaO amount+total SiO 2 amount+total Al 2 O 3 amount)]×100≧9.7. In the formulas, the total CaO amount, the total SiO 2 amount, the total Al 2 O 3 amount and the total Fe amount respectively represent the mass percentage of CaO, the mass percentage of SiO 2 , the mass percentage of Al 2 O 3 and the mass percentage of Fe contained in the agglomerates.
First claim
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1 . A method for producing granular metallic iron, comprising: an agglomeration step of obtaining agglomerates through agglomeration of a mixture that contains an iron oxide-containing material and a carbonaceous reducing agent; and a granulation step of obtaining granular metallic iron by heating the agglomerates, reducing iron oxides in the agglomerates, aggregating generated metallic iron to be granular while separating the metallic iron from slag generated as a by-product, and thereafter cooling and solidifying the metallic iron; wherein agglomerates satisfying all the conditions given by formulas (1) to (3) below are used as the agglomerates: [(total CaO amount+total SiO 2 amount+total Al 2 O 3 amount)/total Fe amount]≧0.250 (1); (total Cat) amount/total SiO 2 amount)≧0.9 (2); [total Al 2 O 3 amount/(total CaO amount+total SiO 2 amount+total Al 2 O 3 amount)]×100≧9.7 (3), wherein the total CaO amount, the total SiO 2 amount, the total Al 2 O 3 amount and the total Fe amount in the formulas (1) to (3) respectively represent the mass percentage of CaO, the mass percentage of SiO 2 , the mass percentage of Al 2 O 3 and the mass percentage of Fe comprised in the agglomerates. 2 . The method for producing granular metallic iron of claim 1 , wherein in the agglomeration step an Al 2 O 3 -containing material is added to the mixture, before the agglomeration of the mixture.
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- What does patent US2017283905A1 cover?
- A method for producing granular metallic iron of the present invention includes: an agglomeration step of obtaining agglomerates through agglomeration of a mixture that contains an iron oxide-containing material and a carbonaceous reducing agent; and a granulation step of obtaining granular metallic iron by heating the agglomerates, reducing iron oxides in the agglomerates, aggregating generate…
- Who is the assignee on this patent?
- Kobe Steel Ltd
- What technology area does this patent fall under?
- Primary CPC classification C22B1/16. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Oct 05 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).