CN116622930A - Method for regulating slag and protecting converter by using white coal - Google Patents
Method for regulating slag and protecting converter by using white coal Download PDFInfo
- Publication number
- CN116622930A CN116622930A CN202310591006.XA CN202310591006A CN116622930A CN 116622930 A CN116622930 A CN 116622930A CN 202310591006 A CN202310591006 A CN 202310591006A CN 116622930 A CN116622930 A CN 116622930A
- Authority
- CN
- China
- Prior art keywords
- slag
- converter
- white coal
- splashing
- protecting
- 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.)
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Links
- 239000002893 slag Substances 0.000 title claims abstract description 142
- 239000003245 coal Substances 0.000 title claims abstract description 40
- 230000002633 protecting effect Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 11
- 238000010079 rubber tapping Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 9
- 230000014759 maintenance of location Effects 0.000 claims abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000004544 sputter deposition Methods 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003756 stirring Methods 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
- 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
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
- C21C5/443—Hot fettling; Flame gunning
-
- 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
- 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 regulating slag and protecting a converter by using white coal, which is characterized by comprising the following steps of: comprising the following steps: 1) The steel tapping of the converter adopts the operation of slag retention and steel retention, and the slag retention amount is 2-3% of the volume capacity of the converter; 2) Adding white coal into the converter after tapping of the converter to regulate slag, and reducing the oxygen content in the slag through a carbon-oxygen reaction, wherein the addition amount of the white coal is 1% -2% of the slag remaining amount of the converter; 3) After the white coal is put into, starting slag splashing furnace protection operation, wherein the slag splashing gun position is changed from high to low, and the slag splashing time is 3-4 min; 4) And pressing the gun position to 0.8m according to the slag splashing effect, lifting the gun, and ending the slag splashing furnace protection. The invention can effectively reduce the oxygen content in the slag, strengthen the viscosity of the slag, enable the slag to be more easily hung on the furnace wall, play a role in protecting the furnace lining, and simultaneously have short furnace time of slag mixing by adding white coal, and can effectively reduce the slag splashing furnace protection time, thereby improving the production efficiency.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a method for regulating slag and protecting a converter by using white coal.
Background
White coal is used as one of auxiliary materials commonly used in steelmaking, and is mainly used for providing a certain amount of chemical heat through a carbon-oxygen reaction when the physical heat and the chemical heat value of molten iron are insufficient. However, the practical application shows that when the molten steel is peroxidized at the end point, the content of FeO in the slag is increased, so that the slag is difficult to remove when the slag is splashed to protect the furnace, the viscosity of the slag is insufficient, the slag cannot be adhered to the furnace lining, and the furnace protecting effect is greatly reduced. Therefore, a method for maintaining the converter lining is required to be developed in a targeted manner so as to play a role in protecting the converter lining.
Disclosure of Invention
The invention aims to: aiming at the defects and defects of the prior art, the invention provides the method for regulating and protecting the slag by using the white coal for the converter, which can effectively reduce the oxygen content in the slag, strengthen the viscosity of the slag, enable the slag to be more easily hung on the furnace wall, play a role in protecting the furnace lining, ensure that the time for taking up the slag by adding the white coal for regulating the slag is short, and effectively reduce the time for splashing slag and protecting the furnace, thereby improving the production efficiency.
The technical scheme is as follows: the invention relates to a method for regulating slag and protecting a converter by using white coal, which is characterized by comprising the following steps of: comprising the following steps:
1) The steel tapping of the converter adopts the operation of slag retention and steel retention, and the slag retention amount is 2-3% of the volume capacity of the converter;
2) Adding white coal into the converter after tapping of the converter to regulate slag, and reducing the oxygen content in the slag through a carbon-oxygen reaction, wherein the addition amount of the white coal is 1% -2% of the slag remaining amount of the converter;
3) After the white coal is put into, the slag splashing furnace protection operation is started, the slag splashing nitrogen pressure is controlled to be 1.0 MPa-1.4 MPa, and the nitrogen flow is controlled to be 26000Nm 3 /h～29000Nm 3 And (h) controlling the distance between the gun head and the slag surface from high to low, changing the gun position, and sputtering the slag for 3-4 min;
4) And pressing the gun position to 0.8m according to the slag splashing effect, lifting the gun, and ending the slag splashing furnace protection.
Wherein, in the step 1), the converter is a 120T converter, and the slag remaining amount is 2-3% of the volume capacity of the converter.
Wherein the weight of the slag in the step 2) is 2.4T-3.6T.
Wherein, the weight of the white coal added in the step 2) is 20 kg-40 kg.
Wherein, the pressure of the slag splashing nitrogen in the step 3) is controlled between 1.1MPa and 1.3MPa.
Wherein, in the step 3), the nitrogen flow is controlled at 27000Nm 3 /h～28000Nm 3 /h。
Wherein, the slag splashing gun position in the step 3) is divided into a slag splashing early stage, a slag splashing middle stage and a slag splashing end stage from high to low, and the distance between the gun head and the slag surface is controlled within the range of 800 mm-1500 mm.
Wherein, the earlier stage of slag splashing adopts high gun position operation, and the gun position is put to 1500mm. The effect of slowly stirring the slag to strengthen the carbon-oxygen reaction is achieved, so that the oxidizing property of the slag is reduced, and the viscosity is enhanced to be firmly hung on the wall of the converter.
Wherein, the gun position is adjusted to 1200mm in the middle of slag splashing, and after the slag is inactive, the gun position is slowly pressed down by 800-1000 mm.
Wherein, the gun position pressure at the end of slag splashing is 800mm, and the slag splashing furnace protection is finished by lifting the gun with the advantages of high slag lifting density at the furnace mouth and certain viscosity of the slag in a sheet shape.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages: the invention uses the white coal to temper the converter slag, can effectively improve the peroxidized slag, reduce the oxidizing property of the slag and increase the viscosity of the slag. After slag is regulated by using white coal, slag can be quickly removed, slag splashing furnace protection time of peroxidation tapping can be reduced, and production efficiency can be improved.
Detailed Description
The technical scheme of the invention is further described below with reference to the specific embodiments.
The invention solves the problems of poor slag splashing effect, long slag splashing time, and influence on the service life of a furnace lining and the operation rate of a converter of the conventional peroxidized steel tapping furnace. After tapping, the peroxide slag is quenched and tempered by adding the white coal, so that the oxygen content in the slag can be effectively reduced, the viscosity of the slag becomes stronger, the slag is more easily hung on the furnace wall, the effect of protecting the furnace lining is achieved, meanwhile, the slag removing time of the furnace time of slag mixing by adding the white coal is short, the slag splashing furnace protecting time can be effectively reduced, and the production efficiency is improved.
Example 1:
the method for slag adjustment and furnace protection of white coal for a converter in the embodiment comprises the following steps:
(1) The weight of molten iron fed into the converter is 104 tons, the addition amount of scrap steel is 24 tons, and the tapping amount is 118 tons.
(2) After tapping, the slag remaining amount is calculated to be about 3 tons, the addition amount of the white coal is 34kg, and the slag sample components are as follows:
TABLE 1 slag sample composition table
(3) When the slag splashing furnace protection is operated, the overall gun position is adjusted in a high-low mode according to the slag lifting effect, the initial slag splashing gun position is 1500mm, the initial slag splashing gun position is adjusted to 1200mm after slag lifting, and the gun is gradually and slowly pressed to 800mm.
(4) The gun lifting ends the slag splashing, and the actual nitrogen supply amount is 1256Nm3. Slag splashing time 3:12, the slag lifting speed is high, the slag is firmly hung on the furnace wall, and the falling area is small.
Example 2:
the method for slag adjustment and furnace protection of white coal for a converter in the embodiment comprises the following steps:
(1) The weight of molten iron fed into the converter is 109 tons, the addition amount of scrap steel is 26 tons, and the tapping amount is calculated to be 125 tons.
(2) After tapping, calculating the slag remaining amount to be about 3 tons, wherein the addition amount of the white coal is 43kg, and the slag sample components are shown in the following table;
TABLE 2 slag sample composition Table
(3) When the slag splashing furnace protection is operated, the overall gun position is adjusted in a high-low mode according to the slag lifting effect, the initial slag splashing gun position is 1500mm, the initial slag splashing gun position is adjusted to 1200mm after slag lifting, and the gun is gradually and slowly pressed to 800mm.
(4) And the gun lifting ends the slag splashing, and the actual nitrogen supply amount is 1342Nm3. Slag splashing time 3:32, the slag lifting speed is high, the slag is firmly hung on the furnace wall, and the falling area is small.
According to the embodiment, by adopting the method for regulating and protecting the slag of the white coal for the converter, disclosed by the invention, the white coal is added after tapping, the content of (FeO) in the slag is reduced, the slag is quickly cooled through slag splashing and protecting, the oxidizing property of the slag can be quickly reduced through high-pressure nitrogen injection at a high gun position, the slag lifting time is short, the slag can be quickly and firmly hung on the furnace wall, the effect of protecting refractory bricks at the furnace bottom is achieved, and the service life of the furnace is prolonged.
Claims (10)
1. A method for regulating slag and protecting a converter by using white coal is characterized by comprising the following steps of: comprising the following steps:
1) The steel tapping of the converter adopts the operation of slag retention and steel retention, and the slag retention amount is 2-3% of the volume capacity of the converter;
2) Adding white coal into the converter after tapping of the converter to regulate slag, and reducing the oxygen content in the slag through a carbon-oxygen reaction, wherein the addition amount of the white coal is 1% -2% of the slag remaining amount of the converter;
3) After the white coal is put into, the slag splashing furnace protection operation is started, the slag splashing nitrogen pressure is controlled to be 1.0 MPa-1.4 MPa, and the nitrogen flow is controlled to be 26000Nm 3 /h～29000Nm 3 And (h) controlling the distance between the gun head and the slag surface from high to low, changing the gun position, and sputtering the slag for 3-4 min;
4) And pressing the gun position to 0.8m according to the slag splashing effect, lifting the gun, and ending the slag splashing furnace protection.
2. The method for slag conditioning and protecting of white coal for a converter according to claim 1, wherein: the converter in the step 1) is a 120T converter, and the slag remaining amount is 2% -3% of the volume capacity of the converter.
3. The method for slag control and furnace protection of white coal for a converter according to claim 2, wherein: the weight of the slag in the step 2) is 2.4T-3.6T.
4. A method for slag conditioning and protecting of white coal for a converter according to claim 3, wherein: the weight of the white coal added in the step 2) is 20 kg-40 kg.
5. The method for slag conditioning and protecting of white coal for a converter according to claim 1, wherein: the pressure of the slag splashing nitrogen in the step 3) is controlled to be 1.1-1.3 MPa.
6. The method for slag conditioning and protecting of white coal for a converter according to claim 1, wherein: the nitrogen flow rate in the step 3) is controlled at 27000Nm 3 /h～28000Nm 3 /h。
7. The method for slag conditioning and protecting of white coal for a converter according to claim 1, wherein: the slag splashing gun position in the step 3) is divided into a slag splashing early stage, a slag splashing middle stage and a slag splashing end stage from high to low, and the distance between the gun head and the slag surface is controlled within the range of 800 mm-1500 mm.
8. The method for slag control and furnace protection of white coal for a converter according to claim 7, wherein: the high gun position operation is adopted in the earlier stage of slag splashing, and the gun position is set to 1500mm.
9. The method for slag conditioning and protecting of white coal for a converter according to claim 8, wherein: and the gun position is regulated to 1200mm in the middle of slag splashing, and after the slag is inactive, the gun position is slowly pressed down by 800-1000 mm.
10. The method for slag conditioning and protecting of white coal for a converter according to claim 9, wherein: the gun position pressure at the end of slag splashing is 800mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310591006.XA CN116622930A (en) | 2023-05-24 | 2023-05-24 | Method for regulating slag and protecting converter by using white coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310591006.XA CN116622930A (en) | 2023-05-24 | 2023-05-24 | Method for regulating slag and protecting converter by using white coal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116622930A true CN116622930A (en) | 2023-08-22 |
Family
ID=87636106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310591006.XA Pending CN116622930A (en) | 2023-05-24 | 2023-05-24 | Method for regulating slag and protecting converter by using white coal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116622930A (en) |
-
2023
- 2023-05-24 CN CN202310591006.XA patent/CN116622930A/en active Pending
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