CN114350880A - Method for controlling oxidability of top slag in steel ladle after converter tapping - Google Patents
Method for controlling oxidability of top slag in steel ladle after converter tapping Download PDFInfo
- Publication number
- CN114350880A CN114350880A CN202210015031.9A CN202210015031A CN114350880A CN 114350880 A CN114350880 A CN 114350880A CN 202210015031 A CN202210015031 A CN 202210015031A CN 114350880 A CN114350880 A CN 114350880A
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- CN
- China
- Prior art keywords
- top slag
- steel ladle
- oxidability
- tapping
- ladle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 65
- 239000010959 steel Substances 0.000 title claims abstract description 65
- 239000002893 slag Substances 0.000 title claims abstract description 56
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 21
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 20
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 15
- 239000004571 lime Substances 0.000 claims abstract description 15
- 229910052786 argon Inorganic materials 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 7
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 230000009471 action Effects 0.000 claims abstract description 4
- 238000005275 alloying Methods 0.000 claims abstract description 4
- 239000003607 modifier Substances 0.000 abstract description 16
- 230000000051 modifying effect Effects 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 239000000428 dust Substances 0.000 abstract description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002411 adverse 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for controlling the oxidability of top slag in a steel ladle after converter tapping, which comprises the following steps: s1, after deoxidation alloying operation is carried out on converter tapping, when the alloy is added, adding a certain amount of active lime into a steel ladle to form top slag in the steel ladle until the tapping operation is finished; and S2, 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, adding a certain amount of aluminum particles into the steel ladle after the active lime is fully melted, and fully contacting and reacting the molten steel with top slag under the stirring action of the argon gas after the steel ladle is added to achieve the effect of reducing the oxidability of the top slag. The invention aims to provide a method for controlling the oxidability of top slag in a steel ladle after converter tapping, which solves the defects of large using amount of the traditional modifier, unsatisfactory modifying effect, large smoke dust during modifying operation and the like.
Description
Technical Field
The invention relates to the field of converter steelmaking technology, in particular to a method for controlling the oxidability of top slag in a steel ladle after converter tapping.
Background
The oxidability of steel slag is closely related to the quality of steel, and the oxidability of steel ladle top slag directly influences the total oxygen content of molten steel in a tundish, so that the cleanliness of the molten steel is influenced. In order to ensure the quality of steel, the oxidability of ladle slag, refining slag and tundish slag must be strictly controlled in the steel-making process, and the capability of absorbing impurities by top slag is improved, so that impurities in steel are reduced, the quality of steel is improved, and the market demand is finally met.
In the aspect of controlling the oxidability of the ladle top slag, the prefabricated top slag modifier is used as a technical means at the present stage, and the oxidability of the top slag is reduced through the reaction between the modifier and the top slag. However, the components of the prefabricated top slag modifier are complex, and when the modifier reacts with top slag even molten steel, the oxidability in the slag is reduced, and the complex chemical components of the modifier easily have adverse effects on the molten steel. Meanwhile, due to different component contents, the modifier is required to achieve an ideal modifying effect, the using amount of the modifier is large, and the production cost of an enterprise is increased; the reaction with slag is violent during modification, a large amount of smoke is generated, and the environment is polluted to a certain extent.
The patented method of the present invention is made in view of the problems mentioned in the background art. Through search query, the document and the invention patent which are the same as or similar to the patent do not exist.
Disclosure of Invention
The invention aims to provide a method for controlling the oxidability of top slag in a steel ladle after converter tapping, which solves the defects of large using amount of the traditional modifier, unsatisfactory modifying effect, large smoke dust during modifying operation and the like in the background art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for controlling the oxidability of top slag in a steel ladle after converter tapping, which comprises the following steps:
s1, after deoxidation alloying operation is carried out on converter tapping, when the alloy is added, adding a certain amount of active lime into a steel ladle to form top slag in the steel ladle until the tapping operation is finished;
and S2, 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, adding a certain amount of aluminum particles into the steel ladle after the active lime is fully melted, and fully contacting and reacting the molten steel with top slag under the stirring action of the argon gas after the steel ladle is added to achieve the effect of reducing the oxidability of the top slag.
Furthermore, the adding amount of the active lime is 3-5 kg/t.
Further, the adding amount of the active lime is 4 kg/t.
Further, the adding amount of the aluminum particles is 0.8-1 kg/t.
Further, the granularity of the aluminum particles is 15-20 mm.
Further, the addition amount of the aluminum particles is 0.9 kg/t.
Compared with the prior art, the invention has the beneficial technical effects that:
after alloy is added in the converter tapping process, active lime is added to form top slag in a steel ladle, so that a deoxidation product and partial slag in molten steel are adsorbed, and the surface of the molten steel is covered to isolate partial air. After the tapping operation is finished, the bottom of the steel ladle is opened to blow argon gas to stir the molten steel, and meanwhile, pure aluminum particles are added into the steel ladle, the density of the pure aluminum particles is far less than that of the steel slag and the molten steel, so that the pure aluminum particles float on the upper part of the steel ladle and react with the steel slag, the strong deoxidation property of aluminum elements is utilized, the pure aluminum particles fully react with FeO in slag, and the oxidability of the top slag of the steel ladle after tapping is effectively reduced. When the molten steel reaches the external refining process or the argon blowing station after the furnace, the top slag modification is finished.
The method is used on a 240t top-bottom combined blown converter, and the data statistics shows the average data of 5 furnaces of ultra-low carbon steel produced by a 3-seat 240t top-bottom combined blown converter in a steel plant. After the method is adopted, the FeO content of the top slag is obviously reduced when the ultra-low carbon steel RH vacuum furnace arrives at the station.
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 the oxidability of top slag in a steel ladle after converter tapping comprises the following steps;
s1, after deoxidation alloying operation is carried out on converter tapping, adding 4kg/t of active lime into a steel ladle when alloy addition is finished, and enabling the active lime to form top slag in the steel ladle until the tapping operation is finished;
and S2, 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, adding aluminum particles into the steel ladle after the active lime is fully melted, wherein the addition amount is 0.9kg/t, the particle size of the aluminum particles is about 15-20mm, the particle size is small, the density is light, and the aluminum particles are fully contacted and reacted with top slag under the stirring action of the argon gas after being added into the steel ladle to achieve the effect of reducing the oxidability of the top slag.
The invention is used on a 240t top-bottom combined blown converter. The data is calculated as the average data of 5 furnaces of the ultra-low carbon steel produced by a 3-seat 240t top-bottom combined blown converter in the steel plant. After the method is adopted, the FeO content of the top slag is obviously reduced when the ultra-low carbon steel RH vacuum furnace arrives at the station. The FeO content of the RH arrival top slag of the ultra-low carbon steel adopting the invention and the pre-prepared modifier is compared as shown in the following table. (the modifier 1-5 and the traditional modifier are explained here. the modifier 1-5 in Table 1 is the traditional prefabricated modifier, the principle is that the aluminum slagging ball is added with lime to be mixed to modify molten steel, the modifier is prepared by dry mixing three raw materials of passivated aluminum powder with the purity of 96 percent, Al2O3 with the purity of 40 percent and CaO with the purity of 91 percent, and the modifier comprises the chemical components of Al (20 percent), A1203(15-25 percent), CaO (40-50 percent), Si02 < 8 percent, C < 1 percent, S < 0.05 percent and P < 0.05 percent in percentage by weight
TABLE 1 comparison of FeO content in top slag (%)
The comparison of test slag samples can visually show that after the method is adopted, the content of FeO in the top slag of the steel ladle is reduced to 0.80 percent from 1.37 percent on average when RH arrives at the station, the reduction amplitude reaches 41 percent, the content of TFe is reduced to 0.95 percent from 1.26 percent on average, the reduction amplitude reaches 24.6 percent, and the effect of controlling the oxidability of the top slag is obvious; meanwhile, the content of the top slag F using the mass agent is 0.07 percent on average, and after the aluminum particles are used for modification, the content percent of the top slag F is reduced to trace amount and can not be detected.
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 (6)
1. A method for controlling the oxidability of top slag in a ladle after converter tapping is characterized by comprising the following steps:
s1, after deoxidation alloying operation is carried out on converter tapping, when the alloy is added, adding a certain amount of active lime into a steel ladle to form top slag in the steel ladle until the tapping operation is finished;
and S2, 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, adding a certain amount of aluminum particles into the steel ladle after the active lime is fully melted, and fully contacting and reacting the molten steel with top slag under the stirring action of the argon gas after the steel ladle is added to achieve the effect of reducing the oxidability of the top slag.
2. The method for controlling the oxidability of the top slag in the ladle after tapping of the converter according to claim 1, wherein the addition amount of the active lime is 3-5 kg/t.
3. The method for controlling the oxidability of the top slag in the ladle after tapping of the converter according to claim 2, wherein the addition amount of the active lime is 4 kg/t.
4. The method for controlling the oxidability of the top slag in the ladle after tapping of the converter according to claim 1, wherein the addition amount of the aluminum particles is 0.8-1 kg/t.
5. The method for controlling the oxidability of the top slag in the ladle after tapping of the converter according to claim 1, wherein the particle size of the aluminum particles is 15-20 mm.
6. The method for controlling the oxidability of the top slag in the ladle after tapping of the converter according to claim 4, wherein the addition amount of the aluminum particles is 0.9 kg/t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210015031.9A CN114350880A (en) | 2022-01-07 | 2022-01-07 | Method for controlling oxidability of top slag in steel ladle after converter tapping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210015031.9A CN114350880A (en) | 2022-01-07 | 2022-01-07 | Method for controlling oxidability of top slag in steel ladle after converter tapping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114350880A true CN114350880A (en) | 2022-04-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210015031.9A Pending CN114350880A (en) | 2022-01-07 | 2022-01-07 | Method for controlling oxidability of top slag in steel ladle after converter tapping |
Country Status (1)
| Country | Link |
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| CN (1) | CN114350880A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798612A (en) * | 2010-04-12 | 2010-08-11 | 首钢总公司 | Process for washing, pre-desulfurizing and refining tapping steel slag of converter |
| CN107858474A (en) * | 2017-10-16 | 2018-03-30 | 首钢集团有限公司 | The control method of ultra-low-carbon steel slag beneficiation and adsorptivity |
| CN110453028A (en) * | 2019-09-04 | 2019-11-15 | 鞍钢股份有限公司 | Method for reducing aluminum-containing steel inclusions |
| CN110804685A (en) * | 2019-12-05 | 2020-02-18 | 唐山瑞丰钢铁（集团）有限公司 | Slag washing and refining process for tapping of converter |
-
2022
- 2022-01-07 CN CN202210015031.9A patent/CN114350880A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798612A (en) * | 2010-04-12 | 2010-08-11 | 首钢总公司 | Process for washing, pre-desulfurizing and refining tapping steel slag of converter |
| CN107858474A (en) * | 2017-10-16 | 2018-03-30 | 首钢集团有限公司 | The control method of ultra-low-carbon steel slag beneficiation and adsorptivity |
| CN110453028A (en) * | 2019-09-04 | 2019-11-15 | 鞍钢股份有限公司 | Method for reducing aluminum-containing steel inclusions |
| CN110804685A (en) * | 2019-12-05 | 2020-02-18 | 唐山瑞丰钢铁（集团）有限公司 | Slag washing and refining process for tapping of converter |
Non-Patent Citations (1)
| Title |
|---|
| 王德永 等: "《洁净钢与清洁辅助原料》", 31 July 2017, 冶金工业出版社 * |
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Application publication date: 20220415 |