CN113881828A - Method for quickly desulfurizing steel - Google Patents
Method for quickly desulfurizing steel Download PDFInfo
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- CN113881828A CN113881828A CN202111240515.5A CN202111240515A CN113881828A CN 113881828 A CN113881828 A CN 113881828A CN 202111240515 A CN202111240515 A CN 202111240515A CN 113881828 A CN113881828 A CN 113881828A
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- steel
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- refining
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 109
- 239000010959 steel Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 90
- 238000007670 refining Methods 0.000 claims abstract description 68
- 238000010079 rubber tapping Methods 0.000 claims abstract description 59
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 42
- 230000023556 desulfurization Effects 0.000 claims abstract description 42
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 18
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 18
- 239000004571 lime Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 18
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 5
- 238000009628 steelmaking Methods 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 23
- 229910052717 sulfur Inorganic materials 0.000 description 22
- 239000011593 sulfur Substances 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 241001417490 Sillaginidae Species 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910052786 argon Inorganic materials 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
- 238000009749 continuous casting Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- C21C7/064—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
- C21C7/06—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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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 method for quickly desulfurizing steel, which comprises the following steps: 1) before tapping, pouring one fourth to one half of the amount of the hot refining slag of the last casting residue into a ladle to be tapped, and then tapping, wherein 3-7 kg of lime per ton of steel is added into the ladle filled with the molten steel to be refined during tapping to obtain a steel material to be refined; 2) and carrying out molten steel refining on the steel material to be refined: after the steel is discharged, the molten steel, namely the steel to be refined, is fed to a refining station for electrifying and heating, and silicon carbide of 0.1-0.3 kg/ton steel is added for slag surface deoxidation, thus finally completing desulfurization. According to the method for rapidly desulfurizing steel, the high-alkalinity refining slag required by desulfurization can be rapidly formed by utilizing the hot refining slag to participate in the slagging in the tapping process; by utilizing the good dynamic condition of the tapping process, the steel slag is fully mixed and contacted, the deoxidation and the desulfurization can be rapidly carried out, and the desulfurization efficiency is extremely high; the refining slag can be recycled all the time, the practicability is strong, and the economic benefit is high.
Description
Technical Field
The invention belongs to the field of steel manufacturing, and particularly relates to a method for quickly desulfurizing steel.
Background
The steel-making desulfurization is a large task in the steel-making process, sulfur in the steel-making process mainly comes from molten iron, scrap steel and other raw materials required by steel making, the sulfur content in the initial steel-making water of a steel-making plant is generally about 0.04%, the sulfur content of the superior steel is generally required to be less than 0.015% by users, the sulfur content of the special steel is required to be less than 0.005% by users, and therefore the sulfur content in the steel must be reduced in the steel-making process.
The task of steel-making desulphurization is mainly completed in an LF ladle refining process, and the desulphurization adopted in most steel plants at present is a process that 6 kg of lime/ton steel and 3 kg of synthetic refining slag/ton steel and other slagging materials are added into a ladle during tapping, then the ladle is electrified to raise the temperature to manufacture high-alkalinity refining slag after reaching a refining station, simultaneously, slag surface deoxidizing materials such as silicon carbide 0.5 kg/ton steel and aluminum particles 0.2 kg/ton steel are added, and the deoxidation and desulphurization task in the refining process is realized by utilizing good dynamic conditions generated by argon blowing at the bottom of the ladle in the refining process, so that the sulfur content in the steel is reduced to the target content.
The main problems of the prior art are as follows: the slag forming speed in the refining process is low, cold materials such as lime, synthetic slag and the like are required to be heated and melted through electrodes to form high-alkalinity refining slag with good fluidity, then deoxidizing materials such as silicon carbide, aluminum particles and the like are added to the slag surface to carry out slag surface diffusion and deoxidation, the sulfur in steel can be gradually removed after the oxygen content in the slag is continuously reduced, the general refining time is ensured to be more than 45 minutes, the sulfur in the steel can be removed from 0.040% to less than 0.015%, if the sulfur is removed to less than 0.005%, longer refining slag surface diffusion and deoxidation time is required, even the slag is re-formed after the refining slag is removed, the refining, slag forming, deoxidizing and desulfurizing work is carried out again, and the refining time is generally more than 1 hour. Traditional refining process desulfurization efficiency is lower, needs longer concise time just to accomplish the desulfurization task, and great restriction concise production rhythm and production efficiency, the desulfurization degree of depth is not enough moreover, smelts special low sulphur steel grade and need take off the sediment secondary and make the concise sediment desulfurization, and the process is complicated, and the operation degree of difficulty is big, hardly guarantees the high efficiency production of continuous casting.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for quickly desulfurizing steel.
The invention is realized by the following technical scheme:
the method for rapidly desulfurizing steel-making comprises the following steps:
1) before tapping, pouring one fourth to one half of the amount of the hot refining slag of the last casting residue into a steel ladle to be tapped, then tapping, and adding 3-7 kg/ton of lime into the steel ladle filled with the molten steel to be refined during tapping without adding other slag materials such as synthetic slag and the like to obtain the steel material to be refined. The molten steel is subjected to slag washing by utilizing the good dynamic condition of tapping in the tapping process, the sulfur content in the steel can be rapidly removed from 0.040% to below 0.015% in the tapping process, namely, the desulfurization task which can be completed in about 40 minutes by the traditional refining is completed in the tapping process, and the molten steel forms the refining slag with good fluidity when reaching a refining furnace after tapping, and the main components of the slag washing are as follows: 55-60% of CaO, not more than 10% of SiO2, 25-30% of Al2O3, 5-6% of MgO and not more than 0.5% of FeO, wherein the high-alkalinity furnace slag has good desulfurization capability;
2) and carrying out molten steel refining on the steel material to be refined: after the steel is discharged, the molten steel, namely the steel to be refined, is fed to a refining station for electrifying and heating, and silicon carbide of 0.1-0.3 kg/ton steel is added for slag surface deoxidation, thus finally completing desulfurization.
Preferably, in the step 1), one third to one half of the amount of the residual slag of the previous furnace is poured into a ladle ready for tapping, and lime is added into the ladle filled with the molten steel to be refined during tapping, wherein the lime accounts for 4-6 kg/ton of the steel.
More preferably, in the step 1), one third of the amount of the residual slag of the previous furnace is poured into a ladle ready for tapping, and 5 kg of lime per ton of steel is added into the ladle filled with molten steel to be refined during tapping.
Preferably, in the step 2), the molten steel after steel tapping, namely the steel to be refined, is fed to a refining station for electrifying and heating, and 0.2 kg/ton of silicon carbide is added for slag surface deoxidation, so that desulfurization is finally completed.
The invention changes the prior steelmaking deoxidization slagging process, introduces a brand new desulfurization process in the production process, namely pouring hot refining slag which is one third to one half of the amount of the residual slag of the previous furnace into a ladle to be tapped before tapping, and then tapping, wherein only 3-7 kg of lime per ton of steel is needed to be added into the ladle during tapping, and other slag materials such as synthetic slag and the like are not needed to be added. The molten steel is subjected to slag washing by utilizing the good dynamic condition of tapping in the tapping process, the sulfur content in the steel can be rapidly removed from 0.040% to below 0.015% in the tapping process, namely, the desulfurization task which can be completed in about 40 minutes by the traditional refining is completed in the tapping process, and the molten steel forms the refining slag with good fluidity when reaching a refining furnace after tapping, and the main components of the slag washing are as follows: 55-60% of CaO, not more than 10% of SiO2, 25-30% of Al2O3, 5-6% of MgO and not more than 0.5% of FeO, wherein the high-alkalinity furnace slag has good desulfurization capability; after the steel is discharged, the molten steel is electrified and heated in a refining station, and 0.2 kg/ton of silicon carbide is added for slag surface deoxidation, so that the sulfur content in the steel is easily and quickly removed from 0.015% to below 0.005%, and finally the desulfurization is finished.
The invention has the beneficial effects that:
the method for quickly desulfurizing steel-making has ingenious and simple process, and can quickly form high-alkalinity refining slag required by desulfurization by utilizing the hot refining slag participating in the slagging process of the steel-making; by utilizing the good dynamic condition of the tapping process, the steel slag is fully mixed and contacted, the deoxidation and the desulfurization can be rapidly carried out, and the desulfurization efficiency is extremely high; the amount of the returned slag is controlled between one fourth and one half of the total slag amount, a certain amount of slag-making materials such as lime and the like are supplemented during tapping, the sulfur capacity of the refining slag can be ensured to be in a controllable range, the desulfurization capacity of the refining slag is ensured, the refining slag can be recycled all the time, the production speed is high, the cost is low, the sustainability is good, the practicability is high, the economic benefit is high, and the following advantages are particularly realized:
1. the refining slag is poured into the steel ladle before tapping, so that the good dynamic conditions of the steel ladle tapping can be fully utilized, the steel slag is fully mixed, and the rapid desulfurization can be realized;
2. the desulfurization task of the refining process is divided into two steps, firstly, the sulfur in the steel is removed from 0.040% to 0.015% during tapping, and the sulfur in the steel is removed from 0.015% to below 0.005% at a refining station, so that the desulfurization task of the refining station is greatly reduced, and the refining efficiency and the product quality are improved;
3. the amount of the returned slag is controlled between one fourth and one half of the total amount of the slag, the sulfur capacity in the slag is controlled in a reasonable range, the refining slag can be recycled, and the subsequent refining slag is ensured to have good desulfurization capability.
Drawings
For ease of illustration, the invention is described in detail by the following specific examples and figures.
FIG. 1 is a schematic diagram of a background art steelmaking desulfurization process;
FIG. 2 is a schematic diagram of the steelmaking desulfurization process of the present invention.
Detailed Description
As shown in FIG. 2, the method for rapidly desulfurizing steel comprises the following steps:
1) before tapping, pouring one fourth to one half of the amount of the hot refining slag of the last casting residue into a steel ladle to be tapped, then tapping, and adding 3-7 kg/ton of lime into the steel ladle filled with the molten steel to be refined during tapping without adding other slag materials such as synthetic slag and the like to obtain the steel material to be refined.
2) And carrying out molten steel refining on the steel material to be refined: after the steel is discharged, the molten steel, namely the steel to be refined, is fed to a refining station for electrifying and heating, and silicon carbide of 0.1-0.3 kg/ton steel is added for slag surface deoxidation, thus finally completing desulfurization.
Preferably, in the step 1), one third to one half of the amount of the residual slag of the previous furnace is poured into a ladle ready for tapping, and lime is added into the ladle filled with the molten steel to be refined during tapping, wherein the lime accounts for 4-6 kg/ton of the steel.
More preferably, in the step 1), one third of the amount of the residual slag of the previous furnace is poured into a ladle ready for tapping, and 5 kg of lime per ton of steel is added into the ladle filled with molten steel to be refined during tapping.
Preferably, in the step 2), 0.2 kg of silicon carbide per ton of steel is added for deoxidation of the slag surface.
The invention changes the prior steelmaking deoxidization slagging process, introduces a brand new desulfurization process in the production process, namely pouring hot refining slag which is one fourth to one half of the amount of the residual slag of the previous furnace into a ladle to be tapped before tapping, and then tapping, wherein only 3-7 kg of lime per ton of steel is needed to be added into the ladle during tapping, and other slag materials such as synthetic slag and the like are not needed to be added. The molten steel is subjected to slag washing by utilizing the good dynamic condition of tapping in the tapping process, the sulfur content in the steel can be rapidly removed from 0.040% to below 0.015% in the tapping process, namely, the desulfurization task which can be completed in about 40 minutes by the traditional refining is completed in the tapping process, and the molten steel forms the refining slag with good fluidity when reaching a refining furnace after tapping, and the main components of the slag washing are as follows: 55-60% of CaO, not more than 10% of SiO2, 25-30% of Al2O3, 5-6% of MgO and not more than 0.5% of FeO, wherein the high-alkalinity furnace slag has good desulfurization capability; after the steel is discharged, the molten steel is electrified and heated in a refining station, and 0.2 kg/ton of silicon carbide is added for slag surface deoxidation, so that the sulfur content in the steel is easily and quickly removed from 0.015 percent to below 0.005 percent.
The method for quickly desulfurizing steel-making has ingenious and simple process, and can quickly form high-alkalinity refining slag required by desulfurization by utilizing the hot refining slag participating in the slagging process of the steel-making; by utilizing the good dynamic condition of the tapping process, the steel slag is fully mixed and contacted, the deoxidation and the desulfurization can be rapidly carried out, and the desulfurization efficiency is extremely high; the amount of the returned slag is controlled between one fourth and one half of the total slag amount, a certain amount of slag-making materials such as lime and the like are supplemented during tapping, the sulfur capacity of the refining slag can be ensured to be in a controllable range, the desulfurization capacity of the refining slag is ensured, the refining slag can be recycled all the time, the production speed is high, the cost is low, the sustainability is good, the practicability is high, the economic benefit is high, and the following advantages are particularly realized:
1. the refining slag is poured into the steel ladle before tapping, so that the good dynamic conditions of the steel ladle tapping can be fully utilized, the steel slag is fully mixed, and the rapid desulfurization can be realized;
2. the desulfurization task of the refining process is divided into two steps, firstly, the sulfur in the steel is removed from 0.040% to 0.015% during tapping, and the sulfur in the steel is removed from 0.015% to below 0.005% at a refining station, so that the desulfurization task of the refining station is greatly reduced, and the refining efficiency and the product quality are improved;
3. the amount of the returned slag is controlled between one fourth and one half of the total amount of the slag, the sulfur capacity in the slag is controlled in a reasonable range, the refining slag can be recycled, and the subsequent refining slag is ensured to have good desulfurization capability.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (4)
1. The method for rapidly desulfurizing steel-making is characterized by comprising the following steps:
1) before tapping, pouring one fourth to one half of the amount of the hot refining slag of the last casting residue into a ladle to be tapped, and then tapping, wherein 3-7 kg of lime per ton of steel is added into the ladle filled with the molten steel to be refined during tapping to obtain a steel material to be refined;
2) and carrying out molten steel refining on the steel material to be refined: after the steel is discharged, the molten steel, namely the steel to be refined, is fed to a refining station for electrifying and heating, and silicon carbide of 0.1-0.3 kg/ton steel is added for slag surface deoxidation, thus finally completing desulfurization.
2. The method for rapidly desulfurizing steel according to claim 1, wherein in step 1), one third to one half of the amount of the slag remaining in the previous casting is poured into the ladle ready for tapping, and 4 to 6 kg of lime is added per ton of steel during tapping to the ladle filled with the molten steel to be refined.
3. The method for rapid desulfurization in steel making according to claim 2, wherein in the step 1), one third of the amount of the last-cast slag is poured into the ladle ready for tapping, and 5 kg/ton of lime is added to the ladle charged with the molten steel to be refined during tapping.
4. The method for rapidly desulfurizing steel making according to claim 1, wherein in the step 2), molten steel after steel discharging, namely steel to be refined, is fed to a refining station for electrifying and heating, and silicon carbide of 0.2 kg/ton steel is added for slag surface deoxidation, and finally desulfurization is completed.
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| CN202111240515.5A CN113881828A (en) | 2021-10-25 | 2021-10-25 | Method for quickly desulfurizing steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111240515.5A CN113881828A (en) | 2021-10-25 | 2021-10-25 | Method for quickly desulfurizing steel |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002079522A1 (en) * | 2001-04-02 | 2002-10-10 | Nucor Corporation | Ladle refining of steel |
| US20100024596A1 (en) * | 2008-08-04 | 2010-02-04 | Nucor Corporation | Low cost making of a low carbon, low sulfur, and low nitrogen steel using conventional steelmaking equipment |
| CN102051444A (en) * | 2010-12-31 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Desulfurizing method of ladle refining furnace and desulfurizing method used for slab-grade steel |
| CN106222363A (en) * | 2016-08-29 | 2016-12-14 | 中天钢铁集团有限公司 | A kind of ladle refining control sulfur technique |
| CN110423952A (en) * | 2019-09-02 | 2019-11-08 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of the low B high purity steel of low S |
| CN110423947A (en) * | 2019-09-02 | 2019-11-08 | 湖南华菱湘潭钢铁有限公司 | A kind of smelting process of the low boron steel of low-sulfur |
-
2021
- 2021-10-25 CN CN202111240515.5A patent/CN113881828A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002079522A1 (en) * | 2001-04-02 | 2002-10-10 | Nucor Corporation | Ladle refining of steel |
| US20100024596A1 (en) * | 2008-08-04 | 2010-02-04 | Nucor Corporation | Low cost making of a low carbon, low sulfur, and low nitrogen steel using conventional steelmaking equipment |
| CN102051444A (en) * | 2010-12-31 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Desulfurizing method of ladle refining furnace and desulfurizing method used for slab-grade steel |
| CN106222363A (en) * | 2016-08-29 | 2016-12-14 | 中天钢铁集团有限公司 | A kind of ladle refining control sulfur technique |
| CN110423952A (en) * | 2019-09-02 | 2019-11-08 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of the low B high purity steel of low S |
| CN110423947A (en) * | 2019-09-02 | 2019-11-08 | 湖南华菱湘潭钢铁有限公司 | A kind of smelting process of the low boron steel of low-sulfur |
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