CN110157859A - Finishing slag adjusting material and its application method for semisteel smelting splashing slag in converter - Google Patents
Finishing slag adjusting material and its application method for semisteel smelting splashing slag in converter Download PDFInfo
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- CN110157859A CN110157859A CN201910313047.6A CN201910313047A CN110157859A CN 110157859 A CN110157859 A CN 110157859A CN 201910313047 A CN201910313047 A CN 201910313047A CN 110157859 A CN110157859 A CN 110157859A
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- slag
- adjusting material
- converter
- finishing
- splashing
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- 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
-
- 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
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of finishing slag adjusting material and its application method for semisteel smelting splashing slag in converter, the finishing slag adjusting material composition are as follows: the 40-60% magnesium carbonaceous grain of resistance to material, 15-25% unprocessed dolomite, 10-20% coke powder, is no more than 2.0% water, surplus for clay at 10-15% light dolomite.Application method is that finishing slag adjusting material is added in converter after tapping, and nitrogen flushing stirring fusing forms new slag with slag melting, is then blown into nitrogen by top blow oxygen lance and blows the slag after fusing and splash the formation furnace lining protective layer on furnace wall, improves steelmaking converter furnace life.On the one hand the present invention reduces FeO content in steel, on the other hand increases clinker content of MgO, improve furnace lining corrosion resistance, 1000 furnaces or more can be improved in steelmaking converter furnace life, reduce and make steel resistance to material cost, reduce environmental pollution by adding adjusting material in converter finishing slag.
Description
Technical field
The invention belongs to metallurgic auxiliary materials technical fields, and in particular to a kind of finishing slag for semisteel smelting splashing slag in converter
Adjusting material and its application method.
Background technique
Pneumatic steelmaking is to be invented early in 1856 by British bass wheat, in order to improve converter lining service life, 20 generation
It records the mid-90, LTV company, the U.S. develops first and using Technology of Slag Splashingfor Furnace Maintenance, and China starts from Taiyuan Iron and Steel Co., Baosteel for 1994
Technology of Slag Splashingfor Furnace Maintenance is applied in equal companies' test, and life of converter is significantly improved.General furnace life is in 8000 furnaces or so.
Chengde Branch Co., Ltd. of Hebei Iron & Steel Group is one using vanadium titano-magnetite as the smelting iron and steel enterprise of raw material,
There are biggish difference in other more domestic iron and steel enterprises of steel-smelting production process, and Chengde Branch Co., Ltd. of Hebei Iron & Steel Group is adopted
Technique is first to carry out vanadium extraction processing to molten iron, and the molten iron after vanadium extraction is known as half steel, and half steel enters converter again and smelted into
For qualified molten steel.
Semisteel smelting and common molten iron smelting it is maximum it is different be exactly half steel heat it is low compared with the heat of molten iron, do not have in half steel
There are the elements such as silicon, manganese, basicity of slag is higher, and slagging is slow, slagging is difficult, and the higher erosion to furnace lining of slag oxidation iron content is serious.
Furnace life is lower than domestic average level, thus by the use of modification adjusting material, the effect of slag splashing can be improved, improve Converter
Age reduces and makes steel resistance to material cost.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of finishing slag adjusting materials for semisteel smelting splashing slag in converter
And its application.The invention can be improved the content of MgO in steel slag, reduce the FeO content in steel slag, improve the furnace retaining effect for splashing slag blanket
Fruit extends the service life of converter lining, improves the furnace life of converter.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of splash slag for semisteel smelting converter
The finishing slag adjusting material of furnace retaining, the finishing slag adjusting material composition are as follows: the 40-60% magnesium carbonaceous grain of resistance to material, 10-15% light dolomite, 15-
25% unprocessed dolomite, 10-20% coke powder are no more than 2.0% water, surplus for clay.
Finishing slag adjusting material of the present invention suppresses slagging ball through mixed high-voltage pelletizer, and the slag spherolite degree is 47-53mm,
Slag ball warp is distributed to steel mill use after drying excessively.
MgO >=45% in finishing slag adjusting material of the present invention.
The magnesium carbonaceous grain of resistance to material of the present invention is to be crushed to granularity by recycling waste and old magnesia carbon brick through crusher and be not more than
The particle of resistance to material of 10mm.
Light dolomite and unprocessed dolomite of the present invention are the particle that granularity is not more than 5mm.
Coke fines size specification of the present invention is≤10mm.
The present invention also provides a kind of application methods of finishing slag adjusting material for semisteel smelting splashing slag in converter, will be whole
Slag adjusting material is added in converter after tapping, and nitrogen flushing stirring fusing makes it melt to form new slag with converter slag, new slag master
Want chemical component are as follows: then CaO:32-45%, MgO:9-15%, FeO:8-14% are blown into nitrogen for new slag by top blow oxygen lance
Blow the furnace lining protective layer for splashing and forming 5-10mm thickness on furnace wall.
SiO in new slag of the present invention2Content is 3-8%.
1000 furnaces or more can be improved in application method of the present invention, steelmaking converter furnace life.
Mentality of designing of the present invention:
Magnesium refractory can effectively improve the content of MgO of slag, be mainly characterized by improving anti-slag action ability；Light dolomite
It is to improve the viscosity of clinker in the basicity and content of MgO for improving slag after high temperature furnace slag melts；Coke powder burns at high temperature to be put
Heat promotes the fusing of regulator out；Unprocessed dolomite is decomposed into calcium and magnesium under the action of high temperature furnace slag and coke powder combustion heating
Oxide；Adjusting material product strictly presses the production of technology formula, and adjusting material is added after having gone out steel in steelmaking converter, mainly utilizes magnesium
Magnesium and carbon adjustment steel slag viscosity simultaneously participate in deoxygenation in carbon brick, optimize slag splashing technique.
The present invention makes full use of adjusting material to melt in furnace and forms new slag with clinker, and it is viscous to splash slag by elevated pressure nitrogen air-blowing
Tie the protective layer that one layer of anti-slag action is formed on furnace wall.Chengde Branch Co., Ltd. of Hebei Iron & Steel Group's converter slag body
System is CaO:32-45%, MgO:5-9%, FeO:15-25%, SiO2: 5-10%；For basicity of slag range in 4.5-6.0, finishing slag is quenched
Agent main component system is the magnesium carbonaceous grain of resistance to material 40-60%, light dolomite 10-15%, unprocessed dolomite 15-25%, coke powder 10-
20%.Converter slag forms new slag: CaO:35-49%, MgO:9-15%, FeO:8-15%, SiO after final slag modifier is added2: 5-
10%；The content of MgO of new slag, which averagely increases by 5.3%, FeO, averagely reduces 8.7%, SiO21.8% is averagely reduced, slag splashing
Effect it is obvious.
The beneficial effects of adopting the technical scheme are that 1, adjusting material of the present invention is by waste magnesia carbon brick, light-burned
Dolomite, unprocessed dolomite, coke powder are main raw material(s), and the use of waste magnesia carbon brick realizes waste utilization, the use of dolomite
The basicity and viscosity for increasing slag are conducive to splash the bonding of clinker after slag, play the purpose of slag splashing.2, the present invention by
Adjusting material is added in converter finishing slag, is on the one hand reduced the FeO content in steel, is on the other hand increased the content of MgO of clinker, improves furnace
The corrosion resistance of lining improves converter service life, reduces and makes steel resistance to material cost, reduces environmental pollution.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Finishing slag adjusting material is tracked in the application of 150 tons of steelmaking converters.
Embodiment 1
The present embodiment is used for the finishing slag adjusting material of semisteel smelting splashing slag in converter by 52% waste magnesia carbon brick powder, 12% light-burned white clouds
The slag that stone, 21% unprocessed dolomite, 12% coke powder, 1.0% water and 2.0% clay are 50mm into granularity through the compacting of mixed high-voltage pelletizer
Ball, slag ball MgO:56%, slag ball warp are distributed to steel mill use after drying excessively.
Finishing slag adjusting material is added in converter after tapping, nitrogen flushing stirring fusing makes it form new slag with slag melting,
New slag main chemical compositions are as follows: CaO:35%, MgO:12%, FeO:14%, SiO2: 8%.Then nitrogen is blown by top blow oxygen lance
Slag after fusing is blown to the furnace lining protective layer for splashing and forming 6mm thickness on furnace wall, steelmaking converter furnace life is made to improve 1110 furnaces.
Embodiment 2
The present embodiment is used for the finishing slag adjusting material of semisteel smelting splashing slag in converter by 48% waste magnesia carbon brick powder, 13% light-burned white clouds
The slag that stone, 23% unprocessed dolomite, 13% coke powder, 1.5% water and 1.5% clay are 48mm into granularity through the compacting of mixed high-voltage pelletizer
Ball, slag ball MgO:48%, slag ball warp are distributed to steel mill use after drying excessively.
Finishing slag adjusting material is added in converter after tapping, nitrogen flushing stirring fusing makes it form new slag with slag melting,
New slag main chemical compositions are as follows: CaO:45%, MgO:9%, FeO:11%, SiO2: 5%.Then nitrogen is blown by top blow oxygen lance
Slag after fusing is blown to the furnace lining protective layer for splashing and forming 5mm thickness on furnace wall, steelmaking converter furnace life is made to improve 1000 furnaces.
Embodiment 3
The present embodiment is used for the finishing slag adjusting material of semisteel smelting splashing slag in converter by 55% waste magnesia carbon brick powder, 10% light-burned white clouds
The slag that stone, 20% unprocessed dolomite, 12% coke powder, 1.2% water and 1.8% clay are 49mm into granularity through the compacting of mixed high-voltage pelletizer
Ball, slag ball MgO:53%, slag ball warp are distributed to steel mill use after drying excessively.
Finishing slag adjusting material is added in converter after tapping, nitrogen flushing stirring fusing makes it form new slag with slag melting,
New slag main chemical compositions are as follows: CaO:42%, MgO:11%, FeO:11%, SiO2: 6%.Then nitrogen is blown by top blow oxygen lance
Slag after fusing is blown to the furnace lining protective layer for splashing and forming 8mm thickness on furnace wall, steelmaking converter furnace life is made to improve 1220 furnaces.
Embodiment 4
The present embodiment is used for the finishing slag adjusting material of semisteel smelting splashing slag in converter by 45% waste magnesia carbon brick powder, 15% light-burned white clouds
The slag that stone, 25% unprocessed dolomite, 12% coke powder, 1.7% water and 1.3% clay are 52mm into granularity through the compacting of mixed high-voltage pelletizer
Ball, slag ball MgO:51%, slag ball warp are distributed to steel mill use after drying excessively.
Finishing slag adjusting material is added in converter after tapping, nitrogen flushing stirring fusing makes it form new slag with slag melting,
New slag main chemical compositions are as follows: CaO:40%, MgO:14%, FeO:13%, SiO2: 5%.Then nitrogen is blown by top blow oxygen lance
Slag after fusing is blown to the furnace lining protective layer for splashing and forming 9mm thickness on furnace wall, steelmaking converter furnace life is made to improve 1305 furnaces.
Embodiment 5
The present embodiment is used for the finishing slag adjusting material of semisteel smelting splashing slag in converter by 58% waste magnesia carbon brick powder, 11% light-burned white clouds
The slag that stone, 17% unprocessed dolomite, 11% coke powder, 1.8% water and 1.2% clay are 51mm into granularity through the compacting of mixed high-voltage pelletizer
Ball, slag ball MgO:55%, slag ball warp are distributed to steel mill use after drying excessively.
Finishing slag adjusting material is added in converter after tapping, nitrogen flushing stirring fusing makes it form new slag with slag melting,
New slag main chemical compositions are as follows: CaO:44%, MgO:12%, FeO:9%, SiO2: 8%.Then nitrogen is blown by top blow oxygen lance
Slag after fusing is blown to the furnace lining protective layer for splashing and forming 7mm thickness on furnace wall, steelmaking converter furnace life is made to improve 1430 furnaces.
Embodiment 6
The present embodiment is used for the finishing slag adjusting material of semisteel smelting splashing slag in converter by 40% waste magnesia carbon brick powder, 14% light-burned white clouds
The slag that stone, 24% unprocessed dolomite, 19% coke powder, 1.3% water and 1.7% clay are 50mm into granularity through the compacting of mixed high-voltage pelletizer
Ball, slag ball MgO:45%, slag ball warp are distributed to steel mill use after drying excessively.
Finishing slag adjusting material is added in converter after tapping, nitrogen flushing stirring fusing makes it form new slag with slag melting,
New slag main chemical compositions are as follows: CaO:42%, MgO:12%, FeO:14%, SiO2: 6%.Then nitrogen is blown by top blow oxygen lance
Slag after fusing is blown to the furnace lining protective layer for splashing and forming 5mm thickness on furnace wall, steelmaking converter furnace life is made to improve 1105 furnaces.
Embodiment 7
The present embodiment is used for the finishing slag adjusting material of semisteel smelting splashing slag in converter by 60% waste magnesia carbon brick powder, 12% light-burned white clouds
The slag that stone, 15% unprocessed dolomite, 10% coke powder, 1.9% water and 1.1% clay are 47mm into granularity through the compacting of mixed high-voltage pelletizer
Ball, slag ball MgO:59%, slag ball warp are distributed to steel mill use after drying excessively.
Finishing slag adjusting material is added in converter after tapping, nitrogen flushing stirring fusing makes it form new slag with slag melting,
New slag main chemical compositions are as follows: CaO:41%, MgO:12%, FeO:8%, SiO2: 8%.Then nitrogen is blown by top blow oxygen lance
Slag after fusing is blown to the furnace lining protective layer for splashing and forming 10mm thickness on furnace wall, steelmaking converter furnace life is made to improve 1500 furnaces.
Embodiment 8
The present embodiment is used for the finishing slag adjusting material of semisteel smelting splashing slag in converter by 50% waste magnesia carbon brick powder, 11% light-burned white clouds
The slag that stone, 16% unprocessed dolomite, 20% coke powder, 2.0% water and 1.0% clay are 53mm into granularity through the compacting of mixed high-voltage pelletizer
Ball, slag ball MgO:52%, slag ball warp are distributed to steel mill use after drying excessively.
Finishing slag adjusting material is added in converter after tapping, nitrogen flushing stirring fusing makes it form new slag with slag melting,
New slag main chemical compositions are as follows: CaO:32%, MgO:15%, FeO:13%, SiO2: 3%.Then nitrogen is blown by top blow oxygen lance
Slag after fusing is blown to the furnace lining protective layer for splashing and forming 7mm thickness on furnace wall, steelmaking converter furnace life is made to improve 1335 furnaces.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (9)
1. a kind of finishing slag adjusting material for semisteel smelting splashing slag in converter, which is characterized in that the finishing slag adjusting material composition
Are as follows: the 40-60% magnesium carbonaceous grain of resistance to material, 15-25% unprocessed dolomite, 10-20% coke powder, is no more than 2.0% at 10-15% light dolomite
Water, surplus are clay.
2. a kind of finishing slag adjusting material for semisteel smelting splashing slag in converter according to claim 1, which is characterized in that
The finishing slag adjusting material suppresses slagging ball through mixed high-voltage pelletizer, and the slag spherolite degree is 47-53mm.
3. a kind of finishing slag adjusting material for semisteel smelting splashing slag in converter according to claim 1, which is characterized in that
MgO >=45% in the finishing slag adjusting material.
4. a kind of finishing slag adjusting material for semisteel smelting splashing slag in converter according to claim 1 to 3,
It is characterized in that, the magnesium carbonaceous grain of resistance to material is to be crushed to granularity by recycling waste and old magnesia carbon brick through crusher and be not more than
The particle of resistance to material of 10mm.
5. a kind of finishing slag adjusting material for semisteel smelting splashing slag in converter according to claim 1 to 3,
It is characterized in that, the light dolomite and unprocessed dolomite are the particle that granularity is not more than 5mm.
6. a kind of finishing slag adjusting material for semisteel smelting splashing slag in converter according to claim 1 to 3,
It is characterized in that, the coke fines size specification is≤10mm.
7. based on a kind of finishing slag adjusting material for semisteel smelting splashing slag in converter as claimed in any one of claims 1 to 6
Application method, which is characterized in that finishing slag adjusting material is added in converter after tapping, nitrogen flushing stirring fusing makes itself and Converter
Slag melts to form new slag, new slag main chemical compositions are as follows: then CaO:32-45%, MgO:9-15%, FeO:8-14% pass through
Top blow oxygen lance is blown into nitrogen and new slag is blown to the furnace lining protective layer for splashing and forming 5-10mm thickness on furnace wall.
8. a kind of application method of finishing slag adjusting material for semisteel smelting splashing slag in converter according to claim 7,
It is characterized in that, SiO in the new slag2Content is 3-8%.
9. a kind of application method of finishing slag adjusting material for semisteel smelting splashing slag in converter according to claim 7,
It is characterized in that, the application method, steelmaking converter furnace life be can be improved to more than 1000 furnaces.
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| CN201910313047.6A CN110157859A (en) | 2019-04-18 | 2019-04-18 | Finishing slag adjusting material and its application method for semisteel smelting splashing slag in converter |
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| CN201910313047.6A CN110157859A (en) | 2019-04-18 | 2019-04-18 | Finishing slag adjusting material and its application method for semisteel smelting splashing slag in converter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110564917A (en) * | 2019-09-24 | 2019-12-13 | 山东钢铁股份有限公司 | Slag modifier and preparation method thereof |
| CN111304400A (en) * | 2020-02-26 | 2020-06-19 | 河钢股份有限公司承德分公司 | Method for protecting converter by splashing slag |
| CN114277212A (en) * | 2020-12-23 | 2022-04-05 | 天津荣程联合钢铁集团有限公司 | Method for prolonging service life of converter |
| CN115159961A (en) * | 2022-06-01 | 2022-10-11 | 玉溪新兴钢铁有限公司 | Method for recycling waste magnesium dry material for continuous casting tundish |
| CN115354111A (en) * | 2022-08-25 | 2022-11-18 | 山西隆迪特工贸有限公司 | Slag modifier for converter steelmaking slag splashing protection and preparation method thereof |
| CN116854492A (en) * | 2023-07-25 | 2023-10-10 | 湖南湘钢瑞泰科技有限公司 | Method for recycling magnesium-containing mixed waste brick slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110564917A (en) * | 2019-09-24 | 2019-12-13 | 山东钢铁股份有限公司 | Slag modifier and preparation method thereof |
| CN111304400A (en) * | 2020-02-26 | 2020-06-19 | 河钢股份有限公司承德分公司 | Method for protecting converter by splashing slag |
| CN111304400B (en) * | 2020-02-26 | 2021-08-17 | 河钢股份有限公司承德分公司 | Method for protecting converter by splashing slag |
| CN114277212A (en) * | 2020-12-23 | 2022-04-05 | 天津荣程联合钢铁集团有限公司 | Method for prolonging service life of converter |
| CN115159961A (en) * | 2022-06-01 | 2022-10-11 | 玉溪新兴钢铁有限公司 | Method for recycling waste magnesium dry material for continuous casting tundish |
| CN115159961B (en) * | 2022-06-01 | 2024-02-13 | 玉溪新兴钢铁有限公司 | Method for recycling waste magnesium dry material for continuous casting tundish |
| CN115354111A (en) * | 2022-08-25 | 2022-11-18 | 山西隆迪特工贸有限公司 | Slag modifier for converter steelmaking slag splashing protection and preparation method thereof |
| CN116854492A (en) * | 2023-07-25 | 2023-10-10 | 湖南湘钢瑞泰科技有限公司 | Method for recycling magnesium-containing mixed waste brick slag |
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