CN107287382A - A kind of method of remained converter slag slag removing and furnace protecting - Google Patents
A kind of method of remained converter slag slag removing and furnace protecting Download PDFInfo
- Publication number
- CN107287382A CN107287382A CN201710730588.XA CN201710730588A CN107287382A CN 107287382 A CN107287382 A CN 107287382A CN 201710730588 A CN201710730588 A CN 201710730588A CN 107287382 A CN107287382 A CN 107287382A
- Authority
- CN
- China
- Prior art keywords
- slag
- furnace
- converter
- remained
- dolomite
- 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.)
- Withdrawn
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
- 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
Present invention relates particularly to a kind of method of remained converter slag slag removing and furnace protecting, mainly solve remaining slag operation security difference and because lime consumption amount is big and caused by the high technical problem of smelting cost.Clinker slag adjusting agent of the present invention is the unprocessed dolomite of low cost, wide material sources, the consumption of reduction slag material and iron content cold burden；And unprocessed dolomite cooling effect is preferably, cooling effect is better than light dolomite and metallurgy lime, terminates to add the quick cooled slag of unprocessed dolomite by tapping, then carry out splashing slag operation, MgO is decomposited in the presence of high temperature furnace slag, increases the content of MgO of clinker, slag splashing effect is improved.One side rapid curing clinker, on the other hand plays action of protecting furnace, improves the lining durability reduction resistance to material cost of fettling.
Description
Technical field
The invention belongs to top-blown converter steelmaking technical field, and in particular to a kind of method of remained converter slag slag removing and furnace protecting.
Background technology
Remaining Slag Operation on LD Converter is in phase early 1980s just it has been proposed that being grasped after staying slag due to no grasp
Make Safe Problem, occur big spray often in iron making, slagging at initial stage is blown after slag comparatively fast simultaneously as staying, if careless manipulation, meeting
Generation splash, oxygen rifle igniting do not eat freely Lou, the problems such as furnace bottom rising is not easy to operate therefore, remaining slag operation, which never has, to be promoted
Using, but Remaining Slag Operation on LD Converter can substantially reduce steel technology, save lime, and can be with the initial stage of bessemerizing
Rapid slagging, and be high alkalinity oxidizing slag, be conducive to improving productivity ratio.
The security of remaining slag operation should be ensured during process implementing, realize that remaining slag operation reduces lime consumption again
And smelting cost, therefore bring very big difficulty to remained converter slag operation is promoted.Oriented turn is used in existing converter operation
Stove stay in slag add coke and after withing in bag magnesia coating make slag adjusting agent, addition lime stone the liquid slag in converter is dropped
Warm dry slag, using modification agent converter final slag composition is adjusted, but there is remaining slag operation security difference and because of lime consumption amount
Cause the high shortcoming of smelting cost greatly.
The content of the invention
The invention aims to solve remaining slag operation security difference and because lime consumption amount is big and caused by smelting cost
There is provided a kind of method of remained converter slag slag removing and furnace protecting for high technical problem.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of method of remained converter slag slag removing and furnace protecting, comprises the following steps：
1) pneumatic steelmaking oxygen supply 13min or so plays rifle, deslagging, and stays part slag in stove, then carries out thermometric and takes terminal
Sample is operated, and is tapped after terminal composition is qualified；
2) tapping terminates, and unprocessed dolomite is added in staying in slag hearth, converter finishing slag in stove is carried out at residue adjustment cooling thickening
Reason, then carries out splashing slag operation；
3) splash slag to terminate, to the built-in steel scrap of converter, steel scrap is paved with furnace bottom, cooled slag makes it be in thickening state.
The step 1) in stay the 7.0-7.5% that the quantity of slag is BOF nominal capacity, it is ensured that there is the enough quantity of slag to improve in stove
Early stage dephosphorization, desulfurized effect, while avoiding staying the quantity of slag excessive, converting process washes away molten bath, influences lining durability.
The step 2) in unprocessed dolomite addition be remained converter slag quality 5.0-10%, reduce slag temperature, together
Content of MgO in Shi Zengjia slags, improves slag splashing effect.
The step 2) in carry out when splashing slag operation, change rifle position takes low rifle position to splash eminence, and high rifle position splashes lower；Splash slag
Nitrogen pressure is controlled in 0.9-1.2Mpa；Flow is controlled in 14000Nm3/h-15500Nm3The distance between/h, pipette tips and top of the slag
Control controls the nitrogen flushing time to be 2-3min in 1.0-2.5m according to working of a furnace situation.Ensure slag splashing effect so that whole furnace lining
All uniformly covered by clinker, reduction refractory consumption and cost.
The step 3) in steel scrap the 15%-20% for BOF nominal capacity, add steel scrap further to clinker carry out
Cool, it is ensured that clinker solidification effect, it is to avoid iron making splash occur.
The present invention uses above technical scheme, and the clinker slag adjusting agent used is the unprocessed dolomite of low cost, wide material sources,
Reduce the consumption of slag material and iron content cold burden；And unprocessed dolomite cooling effect is preferably, cooling effect better than light dolomite and
Metallurgy lime, terminates to add the quick cooled slag of unprocessed dolomite by tapping, then carries out splashing slag operation, in the work of high temperature furnace slag
MgO is decomposited under, increases the content of MgO of clinker, slag splashing effect is improved.One side rapid curing clinker, on the other hand
Action of protecting furnace is played, the lining durability reduction resistance to material cost of fettling is improved.
Embodiment
Implement the present invention for 80 tons of oxygen top-blown converters and carry out following examples, but protection scope of the present invention and not only
It is limited to following examples.
Embodiment 1
A kind of method of remained converter slag slag removing and furnace protecting in the present embodiment, comprises the following steps：
1) pneumatic steelmaking oxygen supply 13min or so plays rifle, deslagging, and stays part slag in stove, and it is 5.6 tons to stay the quantity of slag, then
Carry out thermometric and take whole printing operation, tapped after terminal composition is qualified；
2) tapping terminates, and unprocessed dolomite is added in staying in slag hearth, the addition of unprocessed dolomite is 0.28 ton, to turning in stove
Stove finishing slag carries out residue adjustment cooling thickening processing, then carries out splashing slag operation, and when splashing slag operation, change rifle position takes low rifle position to splash height
Place, high rifle position splashes lower；The control of slag nitrogen pressure is splashed in 0.9Mpa；Flow is controlled in 14000m3/ h, between pipette tips and the top of the slag
Distance controlling controls the nitrogen flushing time to be 2min in 1.0m according to working of a furnace situation；
3) slag is splashed to terminate, to the built-in steel scrap of converter, steel scrap for 12 tons, steel scrap is paved with furnace bottom, cooled slag makes it be in
Thickening state.
Embodiment 2
A kind of method of remained converter slag slag removing and furnace protecting in the present embodiment, comprises the following steps：
1) pneumatic steelmaking oxygen supply 13min or so plays rifle, deslagging, and stays part slag in stove, and it is 6 tons, Ran Houjin to stay the quantity of slag
Row thermometric takes whole printing operation, is tapped after terminal composition is qualified；
2) tapping terminates, and unprocessed dolomite is added in staying in slag hearth, the addition of unprocessed dolomite is 0.6 ton, to turning in stove
Stove finishing slag carries out residue adjustment cooling thickening processing, then carries out splashing slag operation, and when splashing slag operation, change rifle position takes low rifle position to splash height
Place, high rifle position splashes lower；The control of slag nitrogen pressure is splashed in 1.2Mpa；Flow is controlled in 15500m3/ h, between pipette tips and the top of the slag
Distance controlling controls the nitrogen flushing time to be 3min in 2.5m according to working of a furnace situation；
3) slag is splashed to terminate, to the built-in steel scrap of converter, steel scrap for 16 tons, steel scrap is paved with furnace bottom, cooled slag makes it be in
Thickening state.
Embodiment 3
A kind of method of remained converter slag slag removing and furnace protecting in the present embodiment, comprises the following steps：
1) pneumatic steelmaking oxygen supply 13min or so plays rifle, deslagging, and stays part slag in stove, and it is 5.84 tons to stay the quantity of slag, then
Carry out thermometric and take whole printing operation, tapped after terminal composition is qualified；
2) tapping terminates, and unprocessed dolomite is added in staying in slag hearth, the addition of unprocessed dolomite is 0.47 ton, to turning in stove
Stove finishing slag carries out residue adjustment cooling thickening processing, then carries out splashing slag operation, and when splashing slag operation, change rifle position takes low rifle position to splash height
Place, high rifle position splashes lower；The control of slag nitrogen pressure is splashed in 1Mpa；Flow is controlled in 15000m3/ h, between pipette tips and the top of the slag away from
From control in 2m, the nitrogen flushing time is controlled to be 2.5min according to working of a furnace situation；
3) slag is splashed to terminate, to the built-in steel scrap of converter, steel scrap for 13.6 tons, steel scrap is paved with furnace bottom, cooled slag makes it
In thickening state.
Claims (5)
1. a kind of method of remained converter slag slag removing and furnace protecting, it is characterised in that：Comprise the following steps：
1) pneumatic steelmaking oxygen supply 13min or so plays rifle, deslagging, and stays part slag in stove, then carries out thermometric and takes terminal sample to grasp
Make, tapped after terminal composition is qualified；
2) tapping terminates, and unprocessed dolomite is added in staying in slag hearth, residue adjustment cooling thickening processing is carried out to converter finishing slag in stove, so
Carry out splashing slag operation afterwards；
3) splash slag to terminate, to the built-in steel scrap of converter, steel scrap is paved with furnace bottom, cooled slag makes it be in thickening state.
2. a kind of method of remained converter slag slag removing and furnace protecting according to claim 1, it is characterised in that：The step 1) in stay
The quantity of slag is the 7.0-7.5% of BOF nominal capacity.
3. a kind of method of remained converter slag slag removing and furnace protecting according to claim 2, it is characterised in that：The step 2) in it is raw
The addition of dolomite is the 5.0-10% of remained converter slag quality.
4. a kind of method of remained converter slag slag removing and furnace protecting according to claim 3, it is characterised in that：The step 2) in enter
When row splashes slag operation, change rifle position takes low rifle position to splash eminence, and high rifle position splashes lower；The control of slag nitrogen pressure is splashed in 0.9-
1.2Mpa；Flow is controlled in 14000Nm3/h-15500Nm3The distance between/h, pipette tips and top of the slag are controlled in 1.0-2.5m, according to
Working of a furnace situation controls the nitrogen flushing time to be 2-3min.
5. a kind of method of remained converter slag slag removing and furnace protecting according to claim any one of 1-4, it is characterised in that：The step
It is rapid 3) in steel scrap the 15%-20% for BOF nominal capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710730588.XA CN107287382A (en) | 2017-08-23 | 2017-08-23 | A kind of method of remained converter slag slag removing and furnace protecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710730588.XA CN107287382A (en) | 2017-08-23 | 2017-08-23 | A kind of method of remained converter slag slag removing and furnace protecting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107287382A true CN107287382A (en) | 2017-10-24 |
Family
ID=60106470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710730588.XA Withdrawn CN107287382A (en) | 2017-08-23 | 2017-08-23 | A kind of method of remained converter slag slag removing and furnace protecting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107287382A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110835668A (en) * | 2019-11-20 | 2020-02-25 | 盐城市联鑫钢铁有限公司 | Efficient furnace protection method |
| CN111206140A (en) * | 2018-11-21 | 2020-05-29 | 新疆八一钢铁股份有限公司 | Raw dolomite fettling process |
| CN113046513A (en) * | 2021-03-16 | 2021-06-29 | 马鞍山钢铁股份有限公司 | Method for eliminating partial splashing phenomenon in slag splashing furnace protection process |
| CN115341068A (en) * | 2022-08-26 | 2022-11-15 | 湖南华菱涟源钢铁有限公司 | Slag splashing furnace protection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102660658A (en) * | 2012-05-23 | 2012-09-12 | 河北省首钢迁安钢铁有限责任公司 | Method for curing converter slag |
| CN103194566A (en) * | 2013-03-30 | 2013-07-10 | 马钢(集团)控股有限公司 | Slag splashing protection method |
| CN104531940A (en) * | 2015-01-05 | 2015-04-22 | 山东钢铁股份有限公司 | Converter final slag thickening method |
| CN105671237A (en) * | 2016-03-17 | 2016-06-15 | 武钢集团昆明钢铁股份有限公司 | Low-cost slagging and dephosphorizing technique for high-phosphorus molten iron through converter smelting |
| CN105821175A (en) * | 2016-05-27 | 2016-08-03 | 山东钢铁股份有限公司 | Slag-splashing converter protection method for controlling converter profiles |
-
2017
- 2017-08-23 CN CN201710730588.XA patent/CN107287382A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102660658A (en) * | 2012-05-23 | 2012-09-12 | 河北省首钢迁安钢铁有限责任公司 | Method for curing converter slag |
| CN103194566A (en) * | 2013-03-30 | 2013-07-10 | 马钢(集团)控股有限公司 | Slag splashing protection method |
| CN104531940A (en) * | 2015-01-05 | 2015-04-22 | 山东钢铁股份有限公司 | Converter final slag thickening method |
| CN105671237A (en) * | 2016-03-17 | 2016-06-15 | 武钢集团昆明钢铁股份有限公司 | Low-cost slagging and dephosphorizing technique for high-phosphorus molten iron through converter smelting |
| CN105821175A (en) * | 2016-05-27 | 2016-08-03 | 山东钢铁股份有限公司 | Slag-splashing converter protection method for controlling converter profiles |
Non-Patent Citations (1)
| Title |
|---|
| 王雅贞 等: "《氧气顶吹转炉炼钢工艺与设备》", 30 June 2001, 冶金工业出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111206140A (en) * | 2018-11-21 | 2020-05-29 | 新疆八一钢铁股份有限公司 | Raw dolomite fettling process |
| CN110835668A (en) * | 2019-11-20 | 2020-02-25 | 盐城市联鑫钢铁有限公司 | Efficient furnace protection method |
| CN113046513A (en) * | 2021-03-16 | 2021-06-29 | 马鞍山钢铁股份有限公司 | Method for eliminating partial splashing phenomenon in slag splashing furnace protection process |
| CN115341068A (en) * | 2022-08-26 | 2022-11-15 | 湖南华菱涟源钢铁有限公司 | Slag splashing furnace protection method |
| CN115341068B (en) * | 2022-08-26 | 2024-01-26 | 湖南华菱涟源钢铁有限公司 | Slag splashing furnace protection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103060508B (en) | Smelting method for improving phosphorus removal rate of converter | |
| CN102660658B (en) | Method for curing converter slag | |
| CN102212643B (en) | Converter less-slag smelting process | |
| CN105525055B (en) | A kind of control method of converter less-slag melting carbon period splash | |
| CN110387448B (en) | Method for producing low-phosphorus special steel quickly and low in consumption by converter | |
| CN107287382A (en) | A kind of method of remained converter slag slag removing and furnace protecting | |
| CN110129517B (en) | Method for smelting high-silicon iron water based on converter duplex method to improve dephosphorization rate of desiliconization furnace | |
| CN102424886B (en) | Furnace protection process for decarburization converter less slag splashing | |
| CN103060512B (en) | Dephosphorizing and steelmaking method of medium-high-phosphorous semisteel by top-blown converter | |
| CN105671248B (en) | A kind of smelting process of converter high efficiency dephosphorating | |
| CN105132612B (en) | Converter less slag smelting early stage deslagging control method | |
| CN102965466B (en) | Technology for improving slag pouring quantity of converter in stage of dephosphorization | |
| CN103614508B (en) | Method for smelting high-titanium liquid iron by utilizing converter | |
| CN103352101B (en) | Low-cost smelting technology of converter | |
| CN103290163B (en) | Semisteel steelmaking method | |
| CN110117689A (en) | A method of based on high-silicon molten iron converter double slag process low phosphorus steel by smelting | |
| CN102888487A (en) | High-efficiency remaining slag smelting method of converters | |
| CN102965465A (en) | Method for curing converter slag | |
| CN102277470B (en) | Method for smelting low-silicon cold heading steel | |
| CN105132611A (en) | Method for producing ultra-low phosphorous steel through single slag of converter | |
| CN104531940A (en) | Converter final slag thickening method | |
| CN102994685B (en) | Method for opening steel converter | |
| CN102851449B (en) | Refining furnace molten steel dephosphorization method adopting component adjustment and hermetical blowing of argon gas and oxygen gas | |
| CN104726645A (en) | Dephosphorization method of mid-high phosphorus semisteel | |
| CN103725821B (en) | A kind of method improved containing vanadium titanium semi-steel making converter lining life |
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 | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171024 |
|
| WW01 | Invention patent application withdrawn after publication |