CN114350882A - Method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron - Google Patents
Method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron Download PDFInfo
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- CN114350882A CN114350882A CN202111598059.1A CN202111598059A CN114350882A CN 114350882 A CN114350882 A CN 114350882A CN 202111598059 A CN202111598059 A CN 202111598059A CN 114350882 A CN114350882 A CN 114350882A
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- Prior art keywords
- converter
- molten iron
- low
- smelting
- carbon steel
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 42
- 238000003723 Smelting Methods 0.000 title claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 20
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 19
- 239000010703 silicon Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 17
- 239000001301 oxygen Substances 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000002893 slag Substances 0.000 claims abstract description 12
- 239000000571 coke Substances 0.000 claims abstract description 9
- 239000010881 fly ash Substances 0.000 claims abstract description 7
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 238000004939 coking Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 238000012216 screening Methods 0.000 claims abstract description 4
- 239000013589 supplement Substances 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract description 3
- 238000004880 explosion Methods 0.000 abstract description 3
- 238000013022 venting Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000009628 steelmaking Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000010855 food raising agent Nutrition 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron, which comprises the following steps: screening normally produced coke by a coking plant, and taking the coke with the granularity of 4-8 mm as a material for a converter; converter fly ash briquettes or iron sheet balls are used as FeO supplementary materials; when the content of Si in the molten iron fed into the converter is less than 0.35 percent, the converter material is used; after the gun is normally ignited under the normal blowing operation of the converter, 2.0-2.5kg/t of converter material is added along with the first batch, and after smelting is carried out for 3-4 minutes, when the content of C0 in the converter gas begins to rise, 2-3kg/t of fly ash briquettes or iron sheet balls are added to supplement the oxidability of the slag so as to control the melting point of the slag and prevent the occurrence of the dry-back phenomenon. The invention aims to provide a method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron, which solves the defects of high production cost, easy explosion venting of a dust removal system caused by double-slag smelting and the like in the measures for improving the ultra-low carbon steel smelting by the low-silicon molten iron.
Description
Technical Field
The invention relates to the field of converter steelmaking technology, in particular to a method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron.
Background
The production of low-silicon molten iron by modern large-scale blast furnaces can bring great economic benefits to iron and steel enterprises. The silicon content of the blast furnace molten iron is reduced by 0.1 percent, the yield can be improved by 1 to 1.5 percent, and the coke ratio is reduced by 4kg/t iron. The silicon content of the molten iron of the large blast furnace in all countries is reduced. However, compared with the normal silicon-containing molten iron steelmaking, the converter low-silicon molten iron (with the Si content of less than 0.30%) has the problems of insufficient heat, difficult slagging and the like in steelmaking.
The heat income in the converter steelmaking process is mostly derived from the oxidation and heat release of elements such as Si, Mn, P, C and the like in molten iron. Wherein Si is used as a main exothermic element, and the content of the Si directly influences the heat income item of the converter. The Si content is low, the heat release in the smelting process is insufficient, and in the process of producing ultra-low carbon steel, because the target end point temperature is high, the insufficient heat source can only be compensated by C, Fe element in the oxidized molten steel, the end point peroxidation phenomenon is easily caused, and the end point molten steel quality is directly influenced. When the low-silicon molten iron is used for smelting ultra-low-carbon steel in the existing iron and steel enterprises, the method of changing the slagging mode into double-slag smelting is often used; changing the included angle of the oxygen lance nozzle; the ferrosilicon alloy is added as a temperature raising agent to improve the heat balance of the converter. But the defects of high use cost, easy explosion venting of a dust removal system caused by double-slag smelting and the like appear in the application process.
Disclosure of Invention
The invention aims to provide a method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron, which solves the problems of high production cost, easy explosion venting of a dust removal system caused by double-slag smelting and the like in the measures for improving ultra-low carbon steel by low-silicon molten iron in the background technology.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron, which comprises the following steps:
screening normally produced coke by a coking plant, and taking the coke with the granularity of 4-8 mm as a material for a converter;
converter fly ash briquettes or iron sheet balls are used as FeO supplementary materials;
when the content of Si in the molten iron fed into the converter is less than 0.35 percent, the converter material is used;
after the gun is normally ignited under the normal blowing operation of the converter, 2.0-2.5kg/t of converter material is added along with the first batch, and after smelting is carried out for 3-4 minutes, when the content of C0 in the converter gas begins to rise, 2-3kg/t of fly ash briquettes or iron sheet balls are added to supplement the oxidability of the slag so as to control the melting point of the slag and prevent the occurrence of the dry-back phenomenon.
Furthermore, when the content of Si in the molten iron is less than 0.20 percent, the material consumption of the converter is improved by 0.5 kg/t.
Furthermore, when the content of Si in the molten iron is more than 0.30 percent, the material consumption of the converter is reduced by 0.5 kg/t.
Compared with the prior art, the invention has the beneficial technical effects that:
after the method is adopted, the final oxygen content of the ultra-low carbon steel is obviously reduced.
Detailed Description
So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
A method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron comprises the following steps:
screening normally produced coke by a coking plant, and taking the coke with the granularity of 4-8 mm as a material for a converter;
converter fly ash briquettes and iron sheet balls are used as FeO supplementary materials.
When the content of Si in the molten iron fed into the converter is less than 0.35 percent, the converter material is used;
after the gun is normally ignited under the normal blowing operation of the converter, 2.0-2.5kg/t of converter materials are added along with the first batch (the Si content of the molten iron is less than 0.20 percent and can be increased by 0.5kg/t as appropriate, and when the Si content of the molten iron is more than 0.30 percent, the Si content can be reduced by 0.5kg/t as appropriate), after 3-4 minutes of smelting, when the C0 content in the converter gas begins to increase, 2-3kg/t of dedusting ash pressing blocks or iron sheet balls are added to supplement the oxidability of the slag so as to control the melting point of the slag and prevent the occurrence of the dry-back phenomenon.
The invention is used on a 240t top-bottom combined blown converter. The data is calculated as the average data of 15 furnaces of ultra-low carbon steel produced by a 3-seat 240t top-bottom combined blown converter in a steel plant, and the loading in the production process is the same. After the method is adopted, the final oxygen content of the ultra-low carbon steel is obviously reduced. The comparison of the end point oxygen content of ultra low carbon steel before and after the invention is shown in the following table.
TABLE 1 comparison of oxygen content before and after endpoint with the present invention
After the method is adopted, under the condition that the average temperature of the end point is basically the same, the average oxygen of the end point molten steel is reduced by 134 ppm.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. A method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron is characterized by comprising the following steps:
screening normally produced coke by a coking plant, and taking the coke with the granularity of 4-8 mm as a material for a converter;
converter fly ash briquettes or iron sheet balls are used as FeO supplementary materials;
when the content of Si in the molten iron fed into the converter is less than 0.35 percent, the converter material is used;
after the gun is normally ignited under the normal blowing operation of the converter, 2.0-2.5kg/t of converter material is added along with the first batch, and after smelting is carried out for 3-4 minutes, when the content of C0 in the converter gas begins to rise, 2-3kg/t of fly ash briquettes or iron sheet balls are added to supplement the oxidability of the slag so as to control the melting point of the slag and prevent the occurrence of the dry-back phenomenon.
2. The method for controlling end point oxygen in smelting ultra-low carbon steel in low-silicon molten iron according to claim 1, wherein the converter charge is increased by 0.5kg/t when the content of Si in the molten iron is less than 0.20%.
3. The method for controlling end point oxygen in smelting ultra-low carbon steel in low-silicon molten iron according to claim 1, wherein the amount of converter material is reduced by 0.5kg/t when the Si content in the molten iron is greater than 0.30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111598059.1A CN114350882A (en) | 2021-12-24 | 2021-12-24 | Method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111598059.1A CN114350882A (en) | 2021-12-24 | 2021-12-24 | Method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114350882A true CN114350882A (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111598059.1A Pending CN114350882A (en) | 2021-12-24 | 2021-12-24 | Method for controlling end point oxygen in smelting ultra-low carbon steel by low-silicon molten iron |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112322822A (en) * | 2020-10-16 | 2021-02-05 | 包头钢铁（集团）有限责任公司 | Converter single slag smelting method for low-silicon high-phosphorus molten iron |
-
2021
- 2021-12-24 CN CN202111598059.1A patent/CN114350882A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112322822A (en) * | 2020-10-16 | 2021-02-05 | 包头钢铁（集团）有限责任公司 | Converter single slag smelting method for low-silicon high-phosphorus molten iron |
Non-Patent Citations (3)
| Title |
|---|
| 吴文东等: "低硅铁水冶炼工艺实践", 《中国冶金》 * |
| 安君辉 等: "低硅铁水冶炼工艺探讨", 《第七届（2009）中国钢铁年会论文集》 * |
| 李小环: "转炉低Si铁水炼钢生产实践", 《福建冶金》 * |
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Application publication date: 20220415 |