Process for manufacturing a slag conditioning agent for steel desulfurization
US-2024247330-A1 · Jul 25, 2024 · US
Method for producing low-carbon ferromanganese
US12473605B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12473605-B2 |
| Application number | US-202117802389-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 16, 2021 |
| Priority date | Mar 6, 2020 |
| Publication date | Nov 18, 2025 |
| Grant date | Nov 18, 2025 |
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Abstract
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A method for producing low-carbon ferromanganese capable of achieving a high Mn yield. In producing low-carbon ferromanganese by blowing an oxidizing gas from a top-blowing lance onto a bath face of high-carbon ferromanganese molten metal accommodated in a reaction vessel provided with a top-blowing lance and bottom-blowing tuyere to perform decarburization, the slag composition during the blowing is adjusted so that a value of (CaO+MgO)/(Al 2 O 3 +SiO 2 ) on a mass basis in the slag composition is not less than 0.4 but not more than 5.0. Also, agitation is performed under a condition that an agitation power density ε of an agitation gas blown through the bottom-blowing tuyere is not less than 500 W/t.
First claim
Opening claim text (preview).
The invention claimed is: 1 . A method for producing low-carbon ferromanganese comprising blowing an oxidizing gas onto a bath face of high-carbon ferromanganese molten metal contained in a reaction vessel provided with a top-blowing lance and bottom-blowing tuyere, from the top-blowing lance for decarburization, wherein a slag composition during the blowing is adjusted so that a value of (CaO+MgO)/(Al 2 O 3 +SiO 2 ) on a mass basis in the slag composition is not less than 2.5 but not more than 5.0, and an agitation gas is blown from the bottom-blowing tuyere to have an agitation power density of not less than 500 W/t. 2 . The method for producing a low-carbon ferromanganese according to claim 1 , wherein an auxiliary material containing MgO is added before the start of the blowing or during the blowing.
Assignees
Inventors
Classifications
based on iron, e.g. ferro-alloys · CPC title
using master alloys · CPC title
- C21C5/36Primary
Processes yielding slags of special composition · CPC title
Blowing from above and through the bath · CPC title
Treatment with gases (C21C7/06, C21C7/064, C21C7/068 take precedence) · CPC title
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- What does patent US12473605B2 cover?
- A method for producing low-carbon ferromanganese capable of achieving a high Mn yield. In producing low-carbon ferromanganese by blowing an oxidizing gas from a top-blowing lance onto a bath face of high-carbon ferromanganese molten metal accommodated in a reaction vessel provided with a top-blowing lance and bottom-blowing tuyere to perform decarburization, the slag composition during the blow…
- Who is the assignee on this patent?
- Jfe Steel Corp, Jfe Mineral & Alloy Company Ltd
- What technology area does this patent fall under?
- Primary CPC classification C21C5/36. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 18 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).