CN112280924B - Method for controlling temperature in converter smelting - Google Patents
Method for controlling temperature in converter smelting Download PDFInfo
- Publication number
- CN112280924B CN112280924B CN202011076042.5A CN202011076042A CN112280924B CN 112280924 B CN112280924 B CN 112280924B CN 202011076042 A CN202011076042 A CN 202011076042A CN 112280924 B CN112280924 B CN 112280924B
- Authority
- CN
- China
- Prior art keywords
- stage
- slag
- liquid level
- converter smelting
- height
- 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.)
- Active
Links
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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for controlling the temperature in converter smelting, which comprises the following steps: in the earlier stage of converter smelting, the oxygen pressure of the converter is not more than 1.05MPa, and the oxygen lance adopts a low-medium-low mode; feeding in the first stage, wherein the amount of slag is more than 85% of the total amount of slag, 4-8Kg/t of limestone is added, the height of an oxygen lance position from the liquid level of molten iron is 900-125 mm, the duration is 115-125S, and the concentration of CO is less than 20%; feeding in the second stage, namely adding slag and a cooling material containing FeO, wherein the height of the oxygen lance position from the liquid level of molten iron is 1200-1300mm, and the oxygen pressure is 0.85 MPa; in the later stage of converter smelting, CO concentration is observed, when the concentration is 25%, the height of the oxygen lance position from the molten iron liquid level is adjusted to be 950 + 1000mm, according to the slag melting condition, the height of the oxygen lance position from the molten iron liquid level is adjusted, and the lance position is reduced by not more than 25mm each time; the temperature is controlled while the Si element is oxidized in the smelting process of the converter, the temperature of a molten pool is not more than 1500 ℃ during the C-O reaction, and the metal splashing is prevented.
Description
Technical Field
The invention belongs to the technical field of metallurgical converters, and particularly relates to a method for controlling temperature in converter smelting.
Background
At present, the temperature of molten iron is higher than 1350 ℃ due to the abnormal reason of the iron-making blast furnace, and the Si content of the molten iron is higher than 0.55 percent at the same time. The control of the temperature is particularly critical in the process of converter smelting, metal splashing in a high-temperature state often occurs, which is called converter heavy boiling, and the converter heavy boiling often causes environmental protection accidents such as smoking and the like.
Disclosure of Invention
The invention aims to provide a method for controlling the temperature in converter smelting.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for controlling the temperature in converter smelting comprises the following steps:
1) in the earlier stage of converter smelting, the oxygen pressure of the converter is not more than 1.05MPa, and the oxygen lance adopts a low-medium-low mode;
2) feeding in the first stage, wherein the amount of slag is more than 85% of the total amount of slag, 4-8Kg/t of limestone is added, the height of an oxygen lance position from the liquid level of molten iron is 900-125 mm, the duration is 115-125S, and the concentration of CO is less than 20%;
3) feeding in the second stage, namely adding slag and a cooling material containing FeO, wherein the height of the oxygen lance position from the liquid level of molten iron is 1200-1300mm, and the oxygen pressure is 0.85 MPa;
4) and in the later stage of converter smelting, observing the CO concentration, adjusting the height of the oxygen lance position from the molten iron liquid level to be 950-1000mm when the concentration is 25%, and adjusting the height of the oxygen lance position from the molten iron liquid level according to the slag melting condition, wherein the lance position is reduced by not more than 25mm each time.
Specifically, the feeding in the first stage and the feeding in the second stage are controlled within 5min of converting.
Specifically, in the later stage of the converter smelting, no cold charge is added within 2min before the slag melting is finished.
The invention has the following beneficial effects: the whole process of the invention controls the temperature, the reaction of the molten pool is carried out under certain balance, and the metal splashing is controlled; the consumption of steel materials is reduced by 2.4Kg/t on average on the original basis, and the cost is saved by 5.28 yuan/t; the labor intensity of slag treatment staff is reduced, and the number of slag sprays is reduced by 1-2 on average; the TFE content in the slag is reduced by 0.45 percent on the original basis, and the oversize products are kept level; the alkalinity of the slag is controlled between 2.6 and 2.85, and the quality accidents are reduced.
Detailed Description
The present invention will now be described in further detail.
A method for controlling the temperature in converter smelting comprises the following steps:
1) in the earlier stage of converter smelting, the oxygen pressure of the converter is not more than 1.05MPa, and the oxygen lance adopts a low-medium-low mode;
2) feeding in the first stage, wherein the amount of slag is more than 85% of the total amount of slag, 4-8Kg/t of limestone is added, the height of an oxygen lance position from the liquid level of molten iron is 900-125 mm, the duration is 115-125S, and the concentration of CO is less than 20%;
3) feeding in the second stage, namely adding slag and a cooling material containing FeO, wherein the height of the oxygen lance position from the liquid level of molten iron is 1200-1300mm, and the oxygen pressure is 0.85 MPa;
4) and in the later stage of converter smelting, observing the CO concentration, adjusting the height of the oxygen lance position from the molten iron liquid level to be 950-1000mm when the concentration is 25%, and adjusting the height of the oxygen lance position from the molten iron liquid level according to the slag melting condition, wherein the lance position is reduced by not more than 25mm each time.
The molten iron required by the current 60t converter steel comprises the following components:
| composition (I) | C | Si | Mn | P | S | T |
| Range | 3.8-4.9％ | 0.25-0.70％ | 0.20-0.50％ | ≤0.150％ | ≤0.040％ | 1270-1380℃ |
The implementation method of the invention comprises the following steps: the oxygen pressure of the converter at the earlier stage of converter smelting is not more than 1.05MPa, the oxygen lance position adopts a low-medium-low mode, and the CO concentration is mainly controlled by the process to be not more than 45%.
Feeding in the first stage, wherein the lance position of the oxygen lance is controlled at a distance of 900-; and meanwhile, the temperature difference between the return water temperature of the oxygen lance and the inlet water is observed, and when the return water temperature is gradually increased, the Si element is violently oxidized at the moment, so that the temperature of a molten pool is also increased.
And feeding in the second stage, namely increasing the lance position of the oxygen lance to 1200-1300mm of the liquid level, reducing the oxygen pressure to 0.85MPa, relieving the oxidation of Si and promoting the C-O reaction to form foamed slag by earlier slagging, and adding certain cooling materials containing FeO under the condition that the conditions allow, such as: ore, sludge balls and the like, and the early-stage heating speed is relieved.
And closely observing the concentration of CO at the later stage of the converter smelting, and reducing the distance between a lance position and the liquid level by 950-1000mm in time for slagging when the concentration reaches about 25%. With the reaction, the gun position is generally slowly and gradually reduced, and the gun position is reduced by no more than 25mm each time, so that splashing is prevented.
In the whole control process, a 'semi-return-to-dry' smelting mode is observed, a small amount of slag throwing pieces at a furnace mouth are suitable, the CO concentration does not exceed 45%, the whole feeding is controlled within 5min of blowing, cold materials are added to relieve the temperature rise when the temperature rises in the later period, the cold materials are not allowed to be added within 2min before the terminal point, and otherwise, the phenomenon of final slag impermeability occurs; during the whole process, cold materials such as ores and sludge balls are added continuously in batches along with the reaction, so that the temperature rise is relieved, but the whole cold material is added within 10 minutes during the smelting process.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (3)
1. A method for controlling the temperature in converter smelting is characterized by comprising the following steps:
1) in the earlier stage of converter smelting, the oxygen pressure of the converter is not more than 1.05MPa, and the oxygen lance adopts a low-medium-low mode;
2) feeding in the first stage, wherein the amount of slag is more than 85% of the total amount of slag, 4-8Kg/t of limestone is added, the height of an oxygen lance position from the liquid level of molten iron is 900-125 mm, the duration is 115-125S, and the concentration of CO is less than 20%;
3) feeding in the second stage, namely adding slag and a cooling material containing FeO, wherein the height of the oxygen lance position from the liquid level of molten iron is 1200-1300mm, and the oxygen pressure is 0.85 MPa;
4) and in the later stage of converter smelting, observing the CO concentration, adjusting the height of the oxygen lance position from the molten iron liquid level to be 950-1000mm when the concentration is 25%, and adjusting the height of the oxygen lance position from the molten iron liquid level according to the slag melting condition, wherein the lance position is reduced by not more than 25mm each time.
2. The method for controlling the temperature in converter smelting according to claim 1, characterized in that the first-stage feeding and the second-stage feeding are controlled within 5min of blowing.
3. The method for controlling the temperature in the converter smelting according to the claim 1, characterized in that no cold charge is added in the later stage of the converter smelting within 2min before the slagging is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011076042.5A CN112280924B (en) | 2020-10-10 | 2020-10-10 | Method for controlling temperature in converter smelting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011076042.5A CN112280924B (en) | 2020-10-10 | 2020-10-10 | Method for controlling temperature in converter smelting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112280924A CN112280924A (en) | 2021-01-29 |
| CN112280924B true CN112280924B (en) | 2022-03-08 |
Family
ID=74422525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011076042.5A Active CN112280924B (en) | 2020-10-10 | 2020-10-10 | Method for controlling temperature in converter smelting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112280924B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114574654A (en) * | 2022-03-03 | 2022-06-03 | 山东莱钢永锋钢铁有限公司 | Control method for uniformly heating molten steel in converter in smelting process |
| CN114774616A (en) * | 2022-04-26 | 2022-07-22 | 山东莱钢永锋钢铁有限公司 | Method for reducing oxygen consumption by controlling lance position of oxygen lance of top-blown converter |
| CN117724430B (en) * | 2024-01-03 | 2024-05-14 | 山东诺德能源科技有限公司 | Automatic production scheduling method and scheduling system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1412923A (en) * | 1973-03-01 | 1975-11-05 | Centre Rech Metallurgique | Pig iron refining control |
| JP2010013685A (en) * | 2008-07-02 | 2010-01-21 | Nippon Steel Corp | Method for dephosphorizing molten iron |
| CN102230052A (en) * | 2011-07-19 | 2011-11-02 | 莱芜钢铁股份有限公司 | Top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with single-slag process |
| CN105755199A (en) * | 2014-12-15 | 2016-07-13 | 上海梅山钢铁股份有限公司 | Splashing-preventing smelting control method for smelting of molten high-silicon iron in converter |
| CN108977614A (en) * | 2018-08-13 | 2018-12-11 | 山东钢铁股份有限公司 | A method of inhibiting splash converter smelting early period |
| CN110724784A (en) * | 2019-10-14 | 2020-01-24 | 盐城市联鑫钢铁有限公司 | Low-silicon high-phosphorus molten iron converter smelting method |
-
2020
- 2020-10-10 CN CN202011076042.5A patent/CN112280924B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1412923A (en) * | 1973-03-01 | 1975-11-05 | Centre Rech Metallurgique | Pig iron refining control |
| JP2010013685A (en) * | 2008-07-02 | 2010-01-21 | Nippon Steel Corp | Method for dephosphorizing molten iron |
| CN102230052A (en) * | 2011-07-19 | 2011-11-02 | 莱芜钢铁股份有限公司 | Top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with single-slag process |
| CN105755199A (en) * | 2014-12-15 | 2016-07-13 | 上海梅山钢铁股份有限公司 | Splashing-preventing smelting control method for smelting of molten high-silicon iron in converter |
| CN108977614A (en) * | 2018-08-13 | 2018-12-11 | 山东钢铁股份有限公司 | A method of inhibiting splash converter smelting early period |
| CN110724784A (en) * | 2019-10-14 | 2020-01-24 | 盐城市联鑫钢铁有限公司 | Low-silicon high-phosphorus molten iron converter smelting method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112280924A (en) | 2021-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112280924B (en) | Method for controlling temperature in converter smelting | |
| CN101519710B (en) | Method for controlling non-metallic impurities in structural alloy steel | |
| CN100507022C (en) | Method for AOD whole melted iron directly smelting austenitic stainless steel | |
| CN102925818B (en) | Corrosion-resistant and high-temperature resistant bearing steel and production process thereof | |
| CN108085602B (en) | A kind of rolling processing method of abrasion-proof steel ball steel and the steel ball | |
| CN117126977A (en) | Molten steel nitrogen content control method | |
| CN103571999A (en) | Method for smelting nitrogen-controlling martensite stainless steel through total molten iron | |
| CN113186457A (en) | Titanium microalloying hot-rolled ribbed steel bar HRB400E and smelting method thereof | |
| CN103215406B (en) | Low-carbon and ultralow sulfur steel smelting method | |
| CN108842027B (en) | Gasification dephosphorization method and smelting method for final slag of dephosphorization converter | |
| CN108315645B (en) | Wear-resistant steel and production process thereof | |
| CN114535555B (en) | Method for reducing erosion rate of ladle slag line in production of deformed steel bar | |
| CN115505685A (en) | Method for reducing oxidative damage of RH top slag of ultra-low carbon steel | |
| CN113373277B (en) | Method for smelting stainless steel by blowing hydrogen in AOD furnace | |
| CN115418429A (en) | Method for smelting 200-series stainless steel in AOD furnace | |
| CN100540705C (en) | The method of smelting ferritic stainless steel from total molten iron | |
| CN103667875A (en) | Preparation method of low-carbon acid-resistant pipeline steel | |
| CN108796164B (en) | Smelting method of No. 45 steel | |
| CN113088616A (en) | Method for efficiently controlling manganese content of molten steel during steel making of return steel | |
| CN105483312B (en) | A kind of stainless steel does not reduce the method for staying slag | |
| CN115418434B (en) | Production method of low-phosphorus molten iron for carburetion | |
| CN114790503B (en) | Smelting method with addition of iron ore | |
| CN108359817B (en) | Sectional type air supply vanadium extraction method for converter | |
| CN114574654A (en) | Control method for uniformly heating molten steel in converter in smelting process | |
| CN106222356A (en) | A kind of converter steel making method of low steel technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |