CN115094191A - Ladle top slag forming method for smelting low-silicon-content aluminum deoxidized steel - Google Patents
Ladle top slag forming method for smelting low-silicon-content aluminum deoxidized steel Download PDFInfo
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- CN115094191A CN115094191A CN202210692028.0A CN202210692028A CN115094191A CN 115094191 A CN115094191 A CN 115094191A CN 202210692028 A CN202210692028 A CN 202210692028A CN 115094191 A CN115094191 A CN 115094191A
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- silicon
- steel
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- content
- slag
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Links
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000002893 slag Substances 0.000 title claims abstract description 45
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 20
- 229910000532 Deoxidized steel Inorganic materials 0.000 title claims abstract description 18
- 238000003723 Smelting Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 27
- 238000007670 refining Methods 0.000 claims abstract description 25
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 239000010703 silicon Substances 0.000 claims abstract description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000010079 rubber tapping Methods 0.000 claims abstract description 11
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 9
- 230000023556 desulfurization Effects 0.000 claims abstract description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 7
- 239000004571 lime Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229910000655 Killed steel Inorganic materials 0.000 claims 2
- 238000009847 ladle furnace Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 101150055297 SET1 gene Proteins 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 101100042371 Caenorhabditis elegans set-3 gene Proteins 0.000 description 1
- 101150104646 SET4 gene Proteins 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a ladle top slag-making method for smelting low-silicon-content aluminum-deoxidized steel, which is characterized in that when the low-silicon-content aluminum-deoxidized steel is smelted, the adding amount of active lime is 4.5-5.5kg/t in the tapping process, and 0.2-0.25kg/t of aluminum particles is added into ladle top slag after tapping is finished, so that the alkalinity value range of slag components of molten steel refined to a station in an external refining process is ensured to be 5-6, and when the slag-making method is used, the refining desulfurization is stable, and the silicon increasing amount of the molten steel is controlled to be less than 0.03 percent when the FeO content range is 0.5-1.0 percent. The invention aims to provide a ladle top slag forming method for smelting low-silicon-content aluminum deoxidized steel, which solves the problem of silicon increase of molten steel caused by slagging and desulfuration in the external refining process when smelting low-silicon (Si is less than or equal to 0.03%) aluminum deoxidized steel.
Description
Technical Field
The invention relates to the field of converter steelmaking process, in particular to a ladle top slag forming method for smelting low-silicon-content aluminum-deoxidized steel.
Background
When smelting low silicon content (Si is less than or equal to 0.03 percent) aluminum deoxidized steel, the silicon increase of molten steel basically occurs in the following links: a deoxidation alloying process, a refining process, a molten steel waiting after refining and a pouring process.
Under the normal condition, the silicon content of molten steel at the blowing end of a converter is basically zero, and the deoxidation alloying process can be controlled by the required alloy quality because the original auxiliary alloy material is brought into to increase silicon; therefore, the silicon increasing process in the later procedures of refining and the like is difficult to control. Because the percentage of the smelted finished product [ S ] is generally below 0.015 percent under the limit of national standards of products and internal control standard conditions of enterprises, yellow white slag and white slag are required to be made in the refining process, and the desulfurization efficiency can be ensured only by keeping the furnace slag in a reducing atmosphere. However, SiO2 in the slag is reduced into molten steel because of being in the refining reducing atmosphere for a long time, and the phenomenon of silicon increase of the molten steel is easy to happen
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a ladle top slag forming method for smelting low-silicon-content aluminum deoxidized steel, which solves the problem of molten steel silicon increase caused by slagging and desulfurization in the external refining process when low-silicon (Si is less than or equal to 0.03%) aluminum deoxidized steel is smelted in the background technology.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a ladle top slag-forming method for smelting low-silicon-content aluminum deoxidized steel, which is characterized in that when the low-silicon-content aluminum deoxidized steel is smelted, the adding amount of active lime is 4.5-5.5kg/t in the tapping process, and 0.2-0.25kg/t of aluminum particles is added into ladle top slag after tapping is finished, so that the alkalinity value range of slag components in molten steel refined to a station in an external refining process is ensured to be 5-6, and when the FeO content range is 0.5-1.0 percent, the refining desulfurization is stable, and the silicon increasing amount of the molten steel is controlled to be less than 0.03 percent.
Furthermore, the adding amount of the active lime in the tapping process is 5 kg/t.
Furthermore, Si of the low-silicon-content aluminum deoxidized steel is less than or equal to 0.03 percent.
Further, the FeO content of the ladle top slag is reduced to below 0.8 percent when the molten steel arrives at the station.
Further, the slag basicity is reduced to 6.2 or less.
Furthermore, the granularity of the aluminum particles is 15-20 mm.
Further, when the steel ladle reaches an LF refining station, fluorite slag melting agent is added, the adding amount is 0.5-1kg/t, the bottom blowing of the steel ladle is started, argon gas is stirred, electrode heating is carried out, the heating time is 3 minutes, and subsequent refining operation is carried out after top slag is fully melted.
Compared with the prior art, the invention has the beneficial technical effects that:
after the invention is adopted, the alkalinity of the top slag and the FeO content are stably controlled when the molten steel LF arrives at the station, the refining desulfurization efficiency is kept stable, and meanwhile, the Si content is controlled below 0.03 percent, thereby ensuring the component qualification rate.
Detailed Description
A method for smelting ladle top slag of low-silicon aluminum-content deoxidized steel comprises the following steps:
after the converter tapping is subjected to deoxidation alloying operation, and when the alloy is added, 5kg/t of active lime is added into a steel ladle to form top slag in the steel ladle. Until the tapping operation is finished.
And after the tapping operation is finished, opening the bottom of the steel ladle to blow argon gas to stir the molten steel in the steel ladle, fully melting the active lime, and adding aluminum particles into the steel ladle at the addition amount of 0.2-0.25 kg/t. The aluminum grain has the granularity of about 15-20mm, small granularity and light density, and is fully contacted and reacted with the top slag under the stirring action of argon after being added into a steel ladle, so as to achieve the effect of reducing the oxidability of the top slag.
When the steel ladle reaches an LF refining station, fluorite slagging agent is added, the adding amount is 0.5-1kg/t, the bottom blowing of the steel ladle is started, argon gas is stirred, electrode heating is carried out, the heating time is 3 minutes, and the follow-up refining operation is carried out after top slag is fully melted.
The invention is used on a 120t double-station LF refining furnace. The data is counted as average data of 5 furnaces in a 120t double-station LF refining furnace production blank group and a patent method group of a steel plant. After the invention is adopted, the alkalinity of the top slag and the FeO content are stably controlled when the molten steel LF arrives at the station, the refining desulfurization efficiency is kept stable, and meanwhile, the Si content is controlled below 0.03 percent, thereby ensuring the component qualification rate.
Table 1 refining composition of slag to station (%)
| Composition of slag | Al2O3 | CaO | FeO | S | SiO2 | R |
| Blank group-1 | 30.61 | 50.65 | 1.28 | 0.71 | 6.57 | 7.71 |
| Blank group-2 | 24.04 | 43.37 | 1.53 | 0.14 | 9.29 | 4.67 |
| Blank group-3 | 29.58 | 49.73 | 1.44 | 0.38 | 6.41 | 7.76 |
| Blank group-4 | 28 | 47.53 | 1.53 | 0.36 | 7.44 | 6.39 |
| Blank group-5 | 29.16 | 50.71 | 1.36 | 0.28 | 7.19 | 7.05 |
| Blank group average | 28.28 | 48.40 | 1.43 | 0.37 | 7.38 | 6.56 |
| Patent Process set-1 | 34.63 | 48.43 | 0.72 | 0.43 | 8.49 | 5.70 |
| Patent Process set-2 | 37.24 | 50.31 | 0.83 | 0.61 | 7.68 | 6.55 |
| Patent Process set-3 | 29.81 | 49.75 | 0.77 | 0.234 | 8.62 | 5.77 |
| Patent Process set-4 | 35.01 | 50.45 | 0.75 | 0.513 | 7.54 | 6.69 |
| Patent Process set-5 | 34.52 | 48.91 | 0.81 | 0.572 | 7.96 | 6.14 |
| Patent group averaging | 34.24 | 49.57 | 0.78 | 0.47 | 8.06 | 6.17 |
The comparison of test slag samples can be seen intuitively, after the method is adopted, the FeO content of the ladle top slag is reduced from 1.43 percent of the blank group to 0.78 percent of the patent group on average when molten steel arrives at a station, the reduction amplitude reaches 45.5 percent, and the effect of controlling the oxygen activity of the top slag is obvious; meanwhile, the basicity of the slag is reduced from the average of 6.56 of the blank group to 6.17 of the patent group, and the S content of the slag is increased from the average of 7.38% of the blank group to 8.06%, which proves that under the working conditions of the components of the patent slag, the basicity and the oxygen activity of the slag are effectively improved, and the sulfur capacity of the slag is increased. The Si content and S content of the two sets of end-point molten steel are shown in Table 2.
TABLE 2 end-point molten steel composition (%)
| Product ingredient | LF to station S content | S content of finished product | Si content of finished product | LF (ladle furnace) stripperSulfur rate |
| Blank group-1 | 0.28 | 0.009 | 0.032 | 96.79％ |
| Blank group-2 | 0.22 | 0.008 | 0.031 | 96.36％ |
| Blank group-3 | 0.25 | 0.007 | 0.028 | 97.20％ |
| Blank group-4 | 0.19 | 0.008 | 0.032 | 95.79％ |
| Blank group-5 | 0.17 | 0.008 | 0.025 | 95.29％ |
| Blank group average | 0.22 | 0.008 | 0.030 | 96.40％ |
| Patent Process set-1 | 0.26 | 0.008 | 0.028 | 96.92％ |
| Patent Process set-2 | 0.19 | 0.005 | 0.029 | 97.37％ |
| Patent Process group-3 | 0.27 | 0.007 | 0.022 | 97.41％ |
| Patent Process group-4 | 0.24 | 0.006 | 0.026 | 97.50％ |
| Patent Process set-5 | 0.28 | 0.008 | 0.023 | 97.14％ |
| Patent group averaging | 0.25 | 0.007 | 0.026 | 97.26％ |
By comparing the components of the finished molten steel samples of the blank group and the patent group, the average Si content of the finished product is 0.026% of the patent group and is lower than the average Si content of the blank group by 0.03%; the average 97.26% of the refining desulfurization rate in the patent group is higher than the average 96.40% of the blank group.
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 (7)
1. The method for slagging the ladle top slag of the low-silicon-content aluminum-killed steel is characterized in that in the process of smelting the low-silicon-content aluminum-killed steel, the adding amount of active lime is 4.5-5.5kg/t in the tapping process, and 0.2-0.25kg/t of aluminum particles is added into the ladle top slag after tapping is finished, so that the alkalinity value range of slag components of molten steel refined to a station in the external refining process is ensured to be 5-6, and the refining desulfurization is stable and the silicon increasing amount of the molten steel is controlled to be less than 0.03% in the slagging method with the FeO content range of 0.5-1.0%.
2. The method for smelting the ladle top slag of the deoxidized steel containing the low-silicon aluminum and the slag forming is characterized in that the adding amount of the active lime is 5kg/t in the tapping process.
3. The method for slagging from the ladle top of the smelted low-silicon-content deoxidized aluminum steel as claimed in claim 1, wherein Si of the low-silicon-content deoxidized aluminum steel is less than or equal to 0.03%.
4. The method for slagging from the ladle top slag of deoxidized steel for smelting low-silicon aluminum content according to claim 1, characterized in that the FeO content of the ladle top slag is reduced to below 0.8 percent when the molten steel arrives at a station.
5. The method for slagging from the top slag of a steel ladle for smelting low-silicon aluminum-containing deoxidized steel according to claim 1, wherein the alkalinity of the slag is reduced to below 6.2.
6. The method for smelting the ladle top slag of the deoxidized steel with low silicon content and aluminum according to claim 1, wherein the granularity of aluminum grains is 15-20 mm.
7. The method for slagging from the ladle top for smelting low-silicon-content deoxidized aluminum steel according to claim 1, characterized in that a fluorite slagging agent is added when the ladle reaches an LF refining station, the addition is 0.5-1kg/t, the ladle bottom blowing is started to stir argon gas and electrode heating is carried out, the heating time is 3 minutes, and the follow-up refining operation is carried out after the top slag is fully melted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210692028.0A CN115094191A (en) | 2022-06-17 | 2022-06-17 | Ladle top slag forming method for smelting low-silicon-content aluminum deoxidized steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210692028.0A CN115094191A (en) | 2022-06-17 | 2022-06-17 | Ladle top slag forming method for smelting low-silicon-content aluminum deoxidized steel |
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| Publication Number | Publication Date |
|---|---|
| CN115094191A true CN115094191A (en) | 2022-09-23 |
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ID=83290496
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210692028.0A Pending CN115094191A (en) | 2022-06-17 | 2022-06-17 | Ladle top slag forming method for smelting low-silicon-content aluminum deoxidized steel |
Country Status (1)
| Country | Link |
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| CN (1) | CN115094191A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591708A (en) * | 2016-12-21 | 2017-04-26 | 山东钢铁股份有限公司 | Production method for producing low-carbon low-silicon and aluminum-containing steel through short process |
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- 2022-06-17 CN CN202210692028.0A patent/CN115094191A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591708A (en) * | 2016-12-21 | 2017-04-26 | 山东钢铁股份有限公司 | Production method for producing low-carbon low-silicon and aluminum-containing steel through short process |
Non-Patent Citations (3)
| Title |
|---|
| 刘飞等: "低碳低硅铝镇静钢(SPHC)BOF―LF―CCM的生产实践", 《科技信息》 * |
| 宋林海等: "低碳低硅含铝钢CAS直接连铸的生产实践", 《山东冶金》 * |
| 王晓晶: "冷镦钢冶炼过程钢水增硅机理研究", 《天津冶金》 * |
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Application publication date: 20220923 |