CN115323104B - Automatic slag splashing furnace protection method for converter - Google Patents
Automatic slag splashing furnace protection method for converter Download PDFInfo
- Publication number
- CN115323104B CN115323104B CN202210870539.7A CN202210870539A CN115323104B CN 115323104 B CN115323104 B CN 115323104B CN 202210870539 A CN202210870539 A CN 202210870539A CN 115323104 B CN115323104 B CN 115323104B
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- slag
- converter
- splashing
- nitrogen
- steps
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- 239000002893 slag Substances 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 130
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 65
- 238000007664 blowing Methods 0.000 claims abstract description 63
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000001301 oxygen Substances 0.000 claims abstract description 43
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 43
- 238000010079 rubber tapping Methods 0.000 claims abstract description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000000750 progressive effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007921 spray Substances 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
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
- C21C5/443—Hot fettling; Flame gunning
-
- 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
-
- 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 protecting a converter by automatically splashing slag, which is characterized by comprising the following steps of: the method comprises the following steps: step one: controlling the quantity of slag in the converter after tapping; step two: adjusting the internal components of slag in the converter; step three: slag splashing protection for the first time; step four: the secondary slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1000mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 20s; step five: the method comprises the following steps of: adjusting the height of the oxygen lance to 800mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 100s; step six: the last slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 700mm, and blowing nitrogen for 100s; step seven: checking slag splashing condition of furnace lining. The automatic slag splashing furnace protection mode of the converter adopts a scientific slag splashing furnace protection technology, and through repeated slag splashing operations for a plurality of times, not only is the phenomenon that slag is leaked from the inner wall of the converter avoided when the converter goes out, but also the uniformity of the slag hanging thickness is ensured because of the progressive mode for a plurality of times.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a method for automatically splashing slag and protecting a converter.
Background
The slag splashing furnace protection is to spray out the high-pressure nitrogen from the copper mouth of the oxygen gun, to utilize the MgO content in the final slag to reach the saturated or supersaturated end slag, to cool and solidify the slag on the furnace lining by high-pressure nitrogen blowing, to form a slag splashing layer with high melting point, to protect the furnace lining brick. The current new steel converter workshop in spring establishes a slag splashing protection control technology matched with the current end point slag remaining amount by precisely controlling the height of the oxygen lance position in the slag splashing process and precisely setting the control of the nitrogen blowing time of each oxygen lance position, thereby achieving the effect of full-automatic slag splashing.
The traditional slag splashing furnace protection technology is characterized in that the height of an oxygen lance position in the slag splashing furnace protection process is manually controlled, the skill level difference of post staff in an experience mode influences the slag splashing furnace protection effect, the control of the oxygen lance position and the nitrogen blowing time control of the lance position in the 'furnace body' and the 'furnace bottom' of a converter are not standard, the high-pressure nitrogen pressure and the flow directly influence the slag splashing furnace protection effect, the slag splashing furnace protection effect is difficult to be ensured, the analysis is carried out in the traditional manual slag splashing mode, the requirement suitable for the current slag splashing furnace protection technology is found, and the manual intervention is reduced.
The purpose of the technology is to achieve the effect of automatic slag splashing and furnace protection through standardized operation, mainly cool final slag in a furnace in the early stage of nitrogen blowing, and the final slag is in a thinner state in the period of time, even if the adhesion capability of the final slag splashed onto a furnace lining is limited, the longer the slag splashing time is found in practice, the more slag hanging quantity of the furnace lining is found, but the slag splashing caused by long-time fixed gun position slag splashing can cause excessive slag dipping at the bottom of a converter, so that the rising of the bottom of the converter is too fast, and the overlong slag splashing time affects the production rhythm, so that the finding of an automatic slag splashing system matched with a converter workshop is particularly critical.
So we propose a method for automatically splashing slag for protecting the converter so as to solve the problems.
Disclosure of Invention
The invention aims to provide a method for automatically splashing slag for protecting a converter, which aims to solve the problem that the effect of splashing slag for protecting the converter in the current market is poor in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for protecting a converter by automatically splashing slag comprises the following steps:
step one: controlling the quantity of slag in the converter after tapping;
step two: the internal components of the slag in the converter are adjusted, so that the subsequent slag splashing is facilitated, and the method comprises the following specific steps:
s1, adding a slag splashing slag adjusting agent to deoxidize slag;
s2, adjusting the height of the oxygen lance to be 600mm, blowing nitrogen for 20S, and removing ferrous oxide;
step three: the first slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1500mm, and blowing nitrogen; the nitrogen blowing time was controlled to 20s.
Step four: the secondary slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1000mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 20s;
step five: the method comprises the following steps of: adjusting the height of the oxygen lance to 800mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 100s;
step six: the last slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 700mm, and blowing nitrogen for 100s;
step seven: checking the slag splashing condition of the furnace lining, and if the slag splashing condition is needed to be locally sprayed, pouring the slag into a slag tank if the slag splashing condition is met, and ending the slag splashing operation.
Preferably, the formula of the slag control amount in the first step is as follows:
QS＝0.301×W 0.583
wherein: QS is the proper slag remaining amount of the converter, t
W is the nominal tonnage of the converter and t.
Preferably, the slag control amount of the medium-small converter is controlled to be 10-20mm in thickness of the slag layer.
Preferably, the slag composition in the second step is controlled as follows:
FeO：18.49％-22.68％；
Si02：10.69％-17.95％；
Cao：46.91％-52.11％；
MgO：8.3％-15.04％；
R：2.8％-3.2％。
preferably, in the second step, the height range of the oxygen lance is 500-700mm, and the nitrogen blowing time is controlled to be 18-22s.
Preferably, the height range of the oxygen lance in the second step is 1400-1800mm, and the nitrogen blowing time is controlled to be 18-25s.
Preferably, the height range of the oxygen lance in the second step is 900-1200mm, and the nitrogen blowing time is controlled to be 18-22s.
Preferably, the height range of the oxygen lance in the second step is 750-850mm, and the nitrogen blowing time is controlled to be 80-120s.
Preferably, the height range of the oxygen lance in the second step is 600-700mm, and the nitrogen blowing time is controlled to be 90-130s.
Compared with the prior art, the invention has the beneficial effects that:
the automatic slag splashing furnace protection mode of the converter adopts a scientific slag splashing furnace protection technology, through repeated slag splashing operations for a plurality of times, not only is the phenomenon of slag leakage and hanging on the inner wall of the converter avoided, but also the uniformity of the thickness of the hanging slag is ensured because of the progressive mode for a plurality of times, the slag flies out of the converter during slag splashing is also effectively avoided, the safety is increased, the slag splashing wall hanging is stable, the service life of the converter can be greatly improved, the consumption of refractory materials is reduced, the times of bricking the converter are reduced, the operation rate of the converter is improved, the steel yield is improved, and great positive economic benefits are provided for steelmaking of the converter.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention provides a technical scheme that: a method for protecting a converter by automatically splashing slag comprises the following steps:
step one: after tapping, the amount of slag in the converter is controlled, according to qs=0.301×w 0.583 Calculating to obtain 3t;
step two: the internal components of the slag in the converter are adjusted, so that the subsequent slag splashing is facilitated, and the method comprises the following specific steps:
s1, adding a slag splashing slag adjusting agent to deoxidize slag;
s2, adjusting the height of the oxygen lance to be 600mm, blowing nitrogen for 20S, and removing ferrous oxide;
the slag composition is controlled as follows:
FeO：22.68％；
Si02：17.95％；
Cao：47.37％；
MgO：9％；
R：3.0％；
step three: the first slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1500mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 20s;
step four: the secondary slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1000mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 20s;
step five: the method comprises the following steps of: adjusting the height of the oxygen lance to 800mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 100s;
step six: the last slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 700mm, and blowing nitrogen for 100s;
step seven: checking the slag splashing condition of the furnace lining, and if the slag splashing condition is needed to be locally sprayed, pouring the slag into a slag tank if the slag splashing condition is met, and ending the slag splashing operation.
Example two
The invention provides a technical scheme that: a method for protecting a converter by automatically splashing slag comprises the following steps:
step one: after tapping, controlling the quantity of slag in the converter, wherein the thickness of the slag is controlled to be 15mm;
step two: the internal components of the slag in the converter are adjusted, so that the subsequent slag splashing is facilitated, and the method comprises the following specific steps:
s1, adding a slag splashing slag adjusting agent to deoxidize slag;
s2, adjusting the height of the oxygen lance to 630mm, blowing nitrogen for 22S, and removing ferrous oxide;
the slag composition is controlled as follows:
FeO：20％；
Si02：16％；
Cao：50％；
MgO：11.2％；
R：2.8％；
step three: the first slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1480mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 19s;
step four: the secondary slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 980mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 19s;
step five: the method comprises the following steps of: adjusting the height of the oxygen lance to 790mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 105s;
step six: the last slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 650mm, and blowing nitrogen for 98s;
step seven: checking the slag splashing condition of the furnace lining, and if the slag splashing condition is needed to be locally sprayed, pouring the slag into a slag tank if the slag splashing condition is met, and ending the slag splashing operation.
Example III
The invention provides a technical scheme that: a method for protecting a converter by automatically splashing slag comprises the following steps:
step one: after tapping, controlling the quantity of slag in the converter, wherein the thickness of the slag is controlled to be 19mm;
step two: the internal components of the slag in the converter are adjusted, so that the subsequent slag splashing is facilitated, and the method comprises the following specific steps:
s1, adding a slag splashing slag adjusting agent to deoxidize slag;
s2, adjusting the height of the oxygen lance to 640mm, blowing nitrogen for 23S, and removing ferrous oxide;
the slag composition is controlled as follows:
FeO：19％；
Si02：17.37％；
Cao：48.63％；
MgO：11.89％；
R：3.11％；
step three: the first slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1500mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 20s;
step four: the secondary slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 990mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 19s;
step five: the method comprises the following steps of: adjusting the height of the oxygen lance to 800mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 105s;
step six: the last slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 640mm, blowing nitrogen, and controlling the nitrogen blowing time to be 100s;
step seven: checking the slag splashing condition of the furnace lining, and if the slag splashing condition is needed to be locally sprayed, pouring the slag into a slag tank if the slag splashing condition is met, and ending the slag splashing operation.
Example IV
The invention provides a technical scheme that: a method for protecting a converter by automatically splashing slag comprises the following steps:
step one: after tapping, controlling the quantity of slag in the converter, wherein the thickness of the slag is controlled to be 20mm;
step two: the internal components of the slag in the converter are adjusted, so that the subsequent slag splashing is facilitated, and the method comprises the following specific steps:
s1, adding a slag splashing slag adjusting agent to deoxidize slag;
s2, adjusting the height of the oxygen lance to 620mm, blowing nitrogen for 23S, and removing ferrous oxide;
the slag composition is controlled as follows:
FeO：21.5％；
Si02：12.3％；
Cao：50.2％；
MgO：12.8％；
R：3.2％；
step three: the first slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1480mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 19s;
step four: the secondary slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1000mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 21s;
step five: the method comprises the following steps of: adjusting the height of the oxygen lance to 790mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 110s;
step six: the last slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 690mm, and blowing nitrogen for 115s;
step seven: checking the slag splashing condition of the furnace lining, and if the slag splashing condition is needed to be locally sprayed, pouring the slag into a slag tank if the slag splashing condition is met, and ending the slag splashing operation.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (1)
1. A method for automatically splashing slag to protect a converter is characterized in that: the method comprises the following steps:
step one: after tapping, controlling the quantity of slag in the converter, controlling the slag control quantity of the small and medium-sized converter to be 10-20mm in thickness of the slag layer, and calculating to obtain 3t, wherein the slag control quantity formula is as follows:
QS＝0.301×W 0.583
wherein: QS is the proper slag remaining amount of the converter, and the unit is t; w is the nominal tonnage of the converter, and the unit is t;
step two: the internal components of the slag in the converter are adjusted, so that the subsequent slag splashing is facilitated, and the slag components are controlled as follows:
FeO：22.68％；
Si02：17.95％；
Cao：47.37％；
MgO：9％；
R：3.0％；
the method comprises the following specific steps:
s1, adding a slag splashing slag adjusting agent to deoxidize slag;
s2, adjusting the height of the oxygen lance to be 600mm, blowing nitrogen for 20S, and removing ferrous oxide;
step three: the first slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1500mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 20s;
step four: the secondary slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 1000mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 20s;
step five: the method comprises the following steps of: adjusting the height of the oxygen lance to 800mm, and blowing nitrogen; the nitrogen blowing time is controlled to be 100s;
step six: the last slag splashing furnace protection comprises the following steps: adjusting the height of the oxygen lance to 700mm, and blowing nitrogen for 100s;
step seven: checking the slag splashing condition of the furnace lining, and if the slag splashing condition is needed to be locally sprayed, pouring the slag into a slag tank if the slag splashing condition is met, and ending the slag splashing operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210870539.7A CN115323104B (en) | 2022-07-23 | 2022-07-23 | Automatic slag splashing furnace protection method for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210870539.7A CN115323104B (en) | 2022-07-23 | 2022-07-23 | Automatic slag splashing furnace protection method for converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115323104A CN115323104A (en) | 2022-11-11 |
| CN115323104B true CN115323104B (en) | 2024-03-19 |
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| CN202210870539.7A Active CN115323104B (en) | 2022-07-23 | 2022-07-23 | Automatic slag splashing furnace protection method for converter |
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|---|---|---|---|---|
| CN103937927A (en) * | 2014-03-21 | 2014-07-23 | 宝钢集团新疆八一钢铁有限公司 | Slag regulating agent for converter |
| CN106591531A (en) * | 2016-12-09 | 2017-04-26 | 河钢股份有限公司承德分公司 | Method for preventing converter oxygen lances from adhering to steel slag |
| CN112708717A (en) * | 2020-12-15 | 2021-04-27 | 阳春新钢铁有限责任公司 | Method for smelting low-phosphorus molten steel by single-converter duplex method |
| CN112981033A (en) * | 2021-02-04 | 2021-06-18 | 新余钢铁股份有限公司 | Automatic slag splashing control method and system for converter |
| CN113186369A (en) * | 2021-04-01 | 2021-07-30 | 邢台钢铁有限责任公司 | Slag splashing furnace protection method |
| WO2022001874A1 (en) * | 2020-06-29 | 2022-01-06 | 宝山钢铁股份有限公司 | Slag-splashing fettling method |
-
2022
- 2022-07-23 CN CN202210870539.7A patent/CN115323104B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103937927A (en) * | 2014-03-21 | 2014-07-23 | 宝钢集团新疆八一钢铁有限公司 | Slag regulating agent for converter |
| CN106591531A (en) * | 2016-12-09 | 2017-04-26 | 河钢股份有限公司承德分公司 | Method for preventing converter oxygen lances from adhering to steel slag |
| WO2022001874A1 (en) * | 2020-06-29 | 2022-01-06 | 宝山钢铁股份有限公司 | Slag-splashing fettling method |
| CN112708717A (en) * | 2020-12-15 | 2021-04-27 | 阳春新钢铁有限责任公司 | Method for smelting low-phosphorus molten steel by single-converter duplex method |
| CN112981033A (en) * | 2021-02-04 | 2021-06-18 | 新余钢铁股份有限公司 | Automatic slag splashing control method and system for converter |
| CN113186369A (en) * | 2021-04-01 | 2021-07-30 | 邢台钢铁有限责任公司 | Slag splashing furnace protection method |
Non-Patent Citations (1)
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| CN115323104A (en) | 2022-11-11 |
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