Method for preliminary treatment of molten iron
US-2015000470-A1 · Jan 1, 2015 · US
Method of dechromizing molten iron and method of manufacturing phosphate fertilizer raw material
US11254992B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11254992-B2 |
| Application number | US-201816652575-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 16, 2018 |
| Priority date | Oct 20, 2017 |
| Publication date | Feb 22, 2022 |
| Grant date | Feb 22, 2022 |
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Abstract
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On molten iron having a P concentration of 2 to 4 mass % and having a Cr concentration of 0.3 to 1.2 mass %, a dechromization treatment is performed by adjusting a basicity (CaO mass %)/(SiO2 mass %) of slag to greater than 0.1 and 1 or less and supplying an oxygen source with a molten iron temperature falling within a range of 1250 to 1500° C. to manufacture molten iron having a P concentration of 1.9 to 3.8 mass % and having a Cr concentration of less than 0.2 mass %.
First claim
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The invention claimed is: 1. A method of dechromizing molten iron, comprising: on the molten iron having a P concentration of 2 to 4 mass % and having a Cr concentration of 0.3 to 1.2 mass %, performing a dechromization treatment by adjusting a basicity (CaO mass %)/(SiO 2 mass %) of a slag to greater than 0.1 to 1 or less and supplying an oxygen source to the molten iron at a temperature within a range of 1250 to 1500° C. and manufacturing a molten iron having a P concentration of 1.9 to 3.8 mass % and having a Cr concentration of less than 0.2 mass %. 2. The method of dechromizing the molten iron according to claim 1 , wherein the basicity of the slag is adjusted by setting an added amount of flux to 25 kg/ton or less. 3. The method of dechromizing the molten iron according to claim 2 , wherein a starting raw material of the molten iron having the P concentration of 2 to 4 mass % and having the Cr concentration of 0.3 to 1.2 mass % is steelmaking slag obtained by dephosphorizing molten iron manufactured in a shaft furnace. 4. The method of dechromizing the molten iron according to claim 1 , wherein a starting raw material of the molten iron having the P concentration of 2 to 4 mass % and having the Cr concentration of 0.3 to 1.2 mass % is steelmaking slag obtained by dephosphorizing molten iron manufactured in a shaft furnace. 5. A method of manufacturing a phosphate fertilizer raw material, comprising: on the molten iron having the P concentration of 1.9 to 3.8 mass % and having the Cr concentration of less than 0.2 mass % obtained by the method of dechromizing molten iron according to claim 1 , further performing a dephosphorization treatment and cooling.
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- What does patent US11254992B2 cover?
- On molten iron having a P concentration of 2 to 4 mass % and having a Cr concentration of 0.3 to 1.2 mass %, a dechromization treatment is performed by adjusting a basicity (CaO mass %)/(SiO2 mass %) of slag to greater than 0.1 and 1 or less and supplying an oxygen source with a molten iron temperature falling within a range of 1250 to 1500° C. to manufacture molten iron having a P concentratio…
- Who is the assignee on this patent?
- Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C21C1/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 22 2022 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).