CN115786626A - Method for reducing oxygen of industrial material molten steel entering station - Google Patents
Method for reducing oxygen of industrial material molten steel entering station Download PDFInfo
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- CN115786626A CN115786626A CN202211665069.7A CN202211665069A CN115786626A CN 115786626 A CN115786626 A CN 115786626A CN 202211665069 A CN202211665069 A CN 202211665069A CN 115786626 A CN115786626 A CN 115786626A
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- molten steel
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- oxygen
- entering
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 28
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 27
- 239000001301 oxygen Substances 0.000 title claims abstract description 27
- 239000012770 industrial material Substances 0.000 title claims abstract description 18
- 238000007664 blowing Methods 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- 239000004571 lime Substances 0.000 claims abstract description 9
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 8
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 15
- 238000003723 Smelting Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 239000010459 dolomite Substances 0.000 claims description 4
- 229910000514 dolomite Inorganic materials 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000013473 artificial intelligence Methods 0.000 claims description 3
- 230000029087 digestion Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000013178 mathematical model Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 2
- 238000007670 refining Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 abstract description 3
- 206010039509 Scab Diseases 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 208000004434 Calcinosis Diseases 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000002308 calcification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005245 sintering Methods 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
Abstract
The invention discloses a method for reducing oxygen entering industrial material molten steel, which comprises the following steps: step one, adopting a similar one-time hit method, controlling the molten steel end-point carbon to be 0.06-0.08%, controlling the end-point temperature to be 1610 +/-10 ℃, and determining oxygen; secondly, blowing again according to the carbon and P components of a sample, adding metallurgical lime or carrying out point blowing by using 300-500 kg of returned ore, wherein the point blowing time is controlled within 20 seconds, the end point carbon is controlled to be 0.05 +/-0.005%, and the molten steel P is less than or equal to 0.020%; and thirdly, combining with a determined oxygen value, increasing the post-blowing time by 100ppm for 10 seconds to calculate the end point molten steel [ O ] to be less than or equal to 600ppm, and controlling the station entering of the molten steel [ O ] to be 50-100 ppm by adding 240-260 kg/furnace high-aluminum ferromanganese and 3 packets of slag-making deoxidizers through calculation. The method for reducing oxygen of the industrial material molten steel entering the station adopts a similar one-time hit method, and controls the molten steel terminal point (O) to be 600ppm, so that the entering molten steel station (O) is controlled to be less than or equal to 100ppm, the deoxidation pressure of a refining station is relieved for the follow-up, and the rolling scab defect is reduced.
Description
Technical Field
The invention relates to the technical field of converter smelting processes, in particular to a method for reducing oxygen of molten steel entering a station of an industrial material.
Background
The existing converter steelmaking iron loss is more than or equal to 840kg/t, the situation of surplus heat can occur, most steel plants adopt a high iron loss production mode, because of the surplus heat, the amount of sintering return fine ore is added, and the temperature is easily lower, thereby increasing the converter after-blowing, particularly easily causing the molten steel (O) to reach more than 800ppm when smelting industrial materials, and the control of the existing converter steelmaking molten steel (O) mainly has the following defects:
1. when the silicon content of the molten iron exceeds 0.50% or the temperature of the molten iron reaches more than 1300 ℃, an assistant of the converter adds the returned mineral powder according to the material proportioning model, and the situation of the end point temperature being more than or equal to 1640 ℃ and the situation of the end point P being more than or equal to 0.020% are combined, metallurgical lime and a large amount of returned mineral powder are generally added in the process of blowing off the P, and the situation of returning [ O ] of the molten steel is easy to occur, so that the refining deoxidation time is long to influence the subsequent calcification treatment and soft blowing, and the quality of the molten steel is influenced.
2. The control condition of the smelting end point temperature of the converter is not ideal. The smelting end point carbon of the steel-making industrial material is generally controlled to be less than or equal to 0.06 percent, under the condition that the end point carbon is 0.06 percent lower and the temperature is 1600 +/-10 ℃ due to the addition of return fine, the converter adopts gun-pressing blowing and temperature-rising to ensure that the tapping is more than or equal to 1620 ℃, so that the end point (C) is less than or equal to 0.04 percent, the (O) in molten steel reaches more than 800ppm and sometimes more than 1000ppm, and the addition of high-aluminum ferromanganese into the converter reaches more than 300kg, thereby wasting the alloy cost.
3. When the molten steel end point (C) is less than or equal to 0.04 percent, the FeO content in the converter slag reaches more than 20 percent, the slag is thin and has poor slag blocking effect on the converter due to foaming, and the phenomena of slag falling or slag rolling during tapping are easy to occur, so that the molten steel returns to P for steel modification, the quality of the variety steel is damaged, and the production cost is increased.
Disclosure of Invention
The invention aims to provide a method for reducing oxygen in molten steel entering a station of an industrial material, and aims to solve the problems that slag is thin and foaming has poor slag blocking effect on a converter, and slag is easy to fall or roll during tapping, so that molten steel returns to P for steel change, the quality of steel of a variety is damaged, and the production cost is increased.
In order to achieve the purpose, the invention provides the following technical scheme: a method for reducing oxygen entering industrial material molten steel comprises the following steps:
step one, adopting a similar one-time hit method, controlling the molten steel end-point carbon to be 0.06-0.08%, controlling the end-point temperature to be 1610 +/-10 ℃, and determining oxygen;
secondly, blowing again according to the carbon and P components of a sample, adding metallurgical lime or carrying out point blowing by using 300-500 kg of returned ore, wherein the point blowing time is controlled within 20 seconds, the end point carbon is controlled to be 0.05 +/-0.005%, and the molten steel P is less than or equal to 0.020%;
thirdly, combining with a determined oxygen value, increasing the post-blowing time by 100ppm for 10 seconds to calculate the end point molten steel [ O ] to be less than or equal to 600ppm, and controlling the station entering of the molten steel [ O ] to be 50-100 ppm by adding 240-260 kg/furnace high-aluminum ferromanganese and 3 packets of slag-making deoxidizers through calculation;
fourthly, optimizing the operation of the converter, adopting a less slag method aiming at high-temperature or high-silicon molten iron, adding limestone of which the weight is less than or equal to 600kg, and reducing the temperature of the molten steel to be more than or equal to 1640 ℃ when pouring;
fifthly, strengthening end point component control, namely adopting a higher gun position to carry out melting and slag penetration operation when the carbon drawing is close to the end point, so that the P of the molten steel is less than or equal to 0.020 percent, and making a foundation for subsequent point blowing only by adding light-burned dolomite;
and sixthly, when the iron smelting consumption is more than 870kg/t, the molten iron temperature reaches more than 1300 ℃, and the five-hole oxygen lance is used for operation, so that the slag melting effect is ensured.
Preferably, the carbon added in the first step is carburant or electrode particles, and the adding amount is 0.006-1.6% of the mass percentage of the molten steel.
Preferably, in the second step, the steelmaking mathematical model is used for automatically judging whether the secondary molten steel needs to be subjected to the blowing-in-addition operation, if the blowing-in-addition operation is not needed, the metallurgical lime can be directly added or the 300-500 kg return mine can be directly added for point blowing.
Preferably, the optimizing converter operation in the fourth step includes equipment condition monitoring, equipment operation optimizing and reducing steel material digestion.
Preferably, the equipment state monitoring utilizes an artificial intelligence technology to learn, summarize and analyze the normal operation rule of the converter equipment, can autonomously identify the data fluctuation trend of the abnormal state of the equipment, intelligently establishes an equipment personalized early warning model, provides equipment fault early warning in time, and ensures safe production.
Compared with the prior art, the invention has the beneficial effects that: the method for reducing oxygen of molten steel entering the station of the industrial material adopts a similar one-time hit method, controls the end point [ O ] of the molten steel at 600ppm, controls the end point carbon at 0.05 +/-0.005%, and adds 240-260 kg of high-aluminum ferromanganese per furnace according to the end point [ O ] of the molten steel, so that the end point [ O ] of the molten steel entering the station is controlled to be less than or equal to 100ppm, thereby relieving the deoxidation pressure of a refining station subsequently, being beneficial to stably reducing the upper platform [ O ] of the molten steel, reducing the generation of rolling scab defects, preventing the molten steel from being over oxidized, controlling the end point carbon at 0.05% level, being beneficial to smelting and protecting the furnace, and effectively reducing the end point molten steel [ O ] so as to reduce the adding amount of the high-aluminum ferromanganese.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a method for reducing oxygen entering industrial material molten steel comprises the following steps:
a method for reducing oxygen entering industrial material molten steel comprises the following steps:
step one, adopting a similar one-time hit method, controlling the molten steel endpoint carbon to be 0.06-0.08%, controlling the endpoint temperature to be 1610 +/-10 ℃, and determining oxygen;
the carbon added in the first step is carburant or electrode particles, and the adding amount is 0.006-1.6 percent of the mass percentage of the molten steel;
secondly, blowing again according to the carbon and P components of a sample, adding metallurgical lime or carrying out point blowing by using 300-500 kg of returned ore, wherein the point blowing time is controlled within 20 seconds, the end point carbon is controlled to be 0.05 +/-0.005%, and the molten steel P is less than or equal to 0.020%;
in the second step, the steelmaking mathematical model is used for automatically judging whether the secondary molten steel needs to be subjected to the blowing-in-addition operation, if the blowing-in-addition operation is not needed, the metallurgical lime can be directly added or 300-500 kg returned ore is carried out for point blowing;
the equipment state monitoring utilizes an artificial intelligence technology to learn, summarize and analyze the normal operation rule of converter equipment, can autonomously identify the data fluctuation trend of the abnormal state of the equipment, intelligently establishes an equipment personalized early warning model, provides equipment fault early warning in time and ensures safe production;
thirdly, combining with a determined oxygen value, increasing the post-blowing time by 100ppm for 10 seconds to calculate the end point molten steel [ O ] to be less than or equal to 600ppm, and controlling the station entering of the molten steel [ O ] to be 50-100 ppm by adding 240-260 kg/furnace high-aluminum ferromanganese and 3 packets of slag-making deoxidizers through calculation;
fourthly, optimizing the operation of the converter, adopting a less slag method aiming at high-temperature or high-silicon molten iron and adding less than or equal to 600kg of limestone, and reducing the temperature of the molten steel to be more than or equal to 1640 ℃ when the molten steel is poured once;
optimizing converter operation in the fourth step comprises equipment state monitoring, equipment operation optimization and reduction of steel material digestion;
fifthly, strengthening end point component control, namely adopting a higher gun position to carry out melting and slag penetration operation when the carbon drawing is close to the end point, so that the P of the molten steel is less than or equal to 0.020 percent, and making a foundation for subsequent point blowing only by adding light-burned dolomite;
sixthly, when the iron smelting consumption is more than 870kg/t, the temperature of the molten iron reaches more than 1300 ℃, and the five-hole oxygen lance is used for operation, so that the slagging effect is ensured.
Preferably, the carbon added in the first step is carburant or electrode particles, and the adding amount is 0.006-1.6% of the mass percentage of the molten steel.
Example 1: smelting industrial materials in a furnace, wherein the temperature of molten iron in the furnace is 1326 ℃, the silicon content of the molten iron is 0.40 percent, the amount of the molten iron in the furnace is 108.2t, 16.06t of scrap steel is added, 600kg of limestone is added, 2300kg of calcareous metallurgical lime, 2100kg of light calcined dolomite and 3400kg of return ore powder are added simultaneously, the pouring temperature is 1625 ℃, 0.0561 percent of first pouring carbon, 505ppm of definite [ O ], point blowing is carried out for 9 seconds, the end point molten steel [ O ] is about 600ppm according to calculation, 260kg of high-aluminum ferromanganese is added, the station entering [ O ] is 86ppm, the refining station is fed with 36ppm of oxygen after being fed with an aluminum wire for 60m, and is fed with a silicon-calcium wire for 450m, and the molten steel tundish [ O ] is 32.3ppm (the silicon-calcium wire for 100m can be deoxidized for 5 ppm).
Those not described in detail in this specification are within the skill of the art.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (5)
1. A method for reducing oxygen entering industrial material molten steel is characterized in that: the method comprises the following steps:
step one, adopting a similar one-time hit method, controlling the molten steel end-point carbon to be 0.06-0.08%, controlling the end-point temperature to be 1610 +/-10 ℃, and determining oxygen;
secondly, blowing additionally according to the carbon and P components of a reversed sample, and adding metallurgical lime or carrying out point blowing by using 300-500 kg of return mine, wherein the point blowing time is controlled within 20 seconds, so that the end point carbon is controlled to be 0.05 +/-0.005%, and the molten steel P is less than or equal to 0.020%;
thirdly, combining with a determined oxygen value, increasing the post-blowing time by 100ppm for 10 seconds to calculate the end point molten steel [ O ] to be less than or equal to 600ppm, and controlling the station entering of the molten steel [ O ] to be 50-100 ppm by adding 240-260 kg/furnace high-aluminum ferromanganese and 3 packets of slag-making deoxidizers through calculation;
fourthly, optimizing the operation of the converter, adopting a less slag method aiming at high-temperature or high-silicon molten iron and adding less than or equal to 600kg of limestone, and reducing the temperature of the molten steel to be more than or equal to 1640 ℃ when the molten steel is poured once;
fifthly, strengthening end point component control, namely, adopting a higher gun position to operate and completely slag when the carbon pulling is close to the end point, so that the P of the molten steel is less than or equal to 0.020 percent, and laying a foundation for subsequent point blowing only by adding light-burned dolomite;
sixthly, when the iron smelting consumption is more than 870kg/t, the temperature of the molten iron reaches more than 1300 ℃, and the five-hole oxygen lance is used for operation, so that the slagging effect is ensured.
2. The method for reducing the oxygen of the molten steel entering the station of the industrial material according to claim 1, which is characterized in that: the carbon added in the first step is carburant or electrode grain in the amount of 0.006-1.6 wt% of molten steel.
3. The method for reducing the oxygen of the industrial material molten steel entering the station as claimed in claim 1, characterized in that: and in the second step, the steelmaking mathematical model is used for automatically judging whether the secondary molten steel needs to be subjected to the blowing-in-addition operation, and if the blowing-in-addition operation is not needed, the metallurgical lime can be directly added or 300-500 kg returned ore is carried out for point blowing.
4. The method for reducing the oxygen of the industrial material molten steel entering the station as claimed in claim 1, characterized in that: and the fourth step of optimizing the operation of the converter comprises equipment state monitoring, equipment operation optimization and steel material digestion reduction.
5. The method for reducing oxygen of the molten steel of the industrial material as claimed in claim 4, wherein the method comprises the following steps: the equipment state monitoring utilizes an artificial intelligence technology to learn, summarize and analyze the normal operation rule of converter equipment, can autonomously identify the data fluctuation trend of the abnormal state of the equipment, intelligently establishes an equipment personalized early warning model, provides equipment fault early warning in time and ensures safe production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211665069.7A CN115786626A (en) | 2022-12-23 | 2022-12-23 | Method for reducing oxygen of industrial material molten steel entering station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211665069.7A CN115786626A (en) | 2022-12-23 | 2022-12-23 | Method for reducing oxygen of industrial material molten steel entering station |
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| Publication Number | Publication Date |
|---|---|
| CN115786626A true CN115786626A (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202211665069.7A Pending CN115786626A (en) | 2022-12-23 | 2022-12-23 | Method for reducing oxygen of industrial material molten steel entering station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050094922A (en) * | 2004-03-23 | 2005-09-29 | 주식회사 포스코 | Refining method for maintaining high carbon content in molten steel contained in converter |
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| CN105112595A (en) * | 2015-07-24 | 2015-12-02 | 北京科技大学 | Smelting method capable of realizing phosphorus content of less than 70ppm in high-carbon converter tapping |
| CN105420446A (en) * | 2014-09-22 | 2016-03-23 | 南京钢铁股份有限公司 | Light treatment smelting method for ladle furnace (LF) |
| CN110747305A (en) * | 2019-11-05 | 2020-02-04 | 山东钢铁集团日照有限公司 | Converter steelmaking method for producing low-sulfur phosphorus-containing IF steel by using RH single-link process |
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| CN114921607A (en) * | 2022-04-24 | 2022-08-19 | 安阳钢铁股份有限公司 | Method for reducing oxygen content at smelting end point of converter |
| CN115147349A (en) * | 2022-05-12 | 2022-10-04 | 北京科技大学 | Method and device for determining smelting end point of converter, electronic equipment and storage medium |
-
2022
- 2022-12-23 CN CN202211665069.7A patent/CN115786626A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050094922A (en) * | 2004-03-23 | 2005-09-29 | 주식회사 포스코 | Refining method for maintaining high carbon content in molten steel contained in converter |
| CN103627840A (en) * | 2013-11-14 | 2014-03-12 | 攀钢集团研究院有限公司 | Method for enhancing end point carbon content of converter and semisteel steelmaking method |
| CN105420446A (en) * | 2014-09-22 | 2016-03-23 | 南京钢铁股份有限公司 | Light treatment smelting method for ladle furnace (LF) |
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