CN1796576A - Method for maintaining converter - Google Patents
Method for maintaining converter Download PDFInfo
- Publication number
- CN1796576A CN1796576A CN 200410099079 CN200410099079A CN1796576A CN 1796576 A CN1796576 A CN 1796576A CN 200410099079 CN200410099079 CN 200410099079 CN 200410099079 A CN200410099079 A CN 200410099079A CN 1796576 A CN1796576 A CN 1796576A
- Authority
- CN
- China
- Prior art keywords
- slag
- converter
- bottom blowing
- lining
- furnace
- 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.)
- Pending
Links
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
This invention relates to a lining protection method for converter with detailed process as follows: investigate the circumstance of slag after tapping of converter and add some slag coordinating materials into high-temperature and high-oxidative slag so as to keep the MgO content in the slag above 8%; tilt the converter back and forth so as to enhance the fusion of the slag and make partial slag coherent to the converter wall; set the bottom blowing flux and split the quenched and tempered slag onto the wall surface by bottom blowing ventilating components; the control of bottom blowing flux can be modulated according to the lining corrosion and slag circumstances. In this invention, bottom blowing ventilating components are employed and nitrogen and argon are blowing for slag splitting and deposition. Therefore, the line slag, molten pool and ear-axis areas, which are usually corroded most seriously, can be effectively protected. Difficult issues such as sticking lances and burning lances of oxygen lances and bottom rising in the lining protection process of top blowing slag splitting and flow blockage of bottom blowing ventilating components in top and bottom blowing converter are completely avoided. Besides, it also significantly weakens the corrosion of feeble sites of lining and displays considerable lining protection effect.
Description
Technical field
The invention belongs to the converter smelting field, particularly maintaining converter technology.
Background technology
Existing method for maintaining converter comprises mending material furnace retaining method, carries out the slag splashing method with converter top rifle.Wherein, mending material furnace retaining method mainly is to adopt the fettling material of certain proportioning and granularity, covers the furnace lining surface that weathers; because compositions such as the main magnesia of fettling material, graphite, wedding agent; have higher refractoriness, therefore, under the steel-making condition, play the protection furnace lining and reduce the erosive effect.
Spray repairing machine or the hopper furnace lining surface that fettling material is sprayed onto or tiles is mainly used in the mending material furnace retaining, makes mending material stick to the furnace lining surface, by furnace high-temperature not the furnace charge sintering stick to the furnace lining surface, play the furnace retaining effect.
The advantage of this method is that the mending material erosion resistance that sticks to the furnace lining surface behind its fettling is good, and general mending material spray repair can be kept 6～10 stoves, fills up and can keep about 40 stoves.
But its shortcoming is that the filling time is long generally more than 30 minutes, and mending material costs an arm and a leg, fettling cost height.
Carry out the slag splashing method with converter top rifle, it is to import China from the mid-90 in last century into by the U.S., is widely used in China, and result of use is good, and this furnace retaining method combines with mending material furnace retaining method, and converter lining life is reached more than ten thousand stoves.Become a kind of main furnace retaining method in China at present.
The N that this furnace retaining method cardinal principle is penetrated by oxygen lance spraying
2Jet splashes the slag in the stove, makes the adhesion of slag on the furnace lining surface.Owing to contain certain MgO in the slag,, can make slag have certain refractoriness by suitable slag modification.If every stove slag splashing can form certain refractory-lined ovens slag blanket on the furnace lining surface, effectively slow down lining erosion speed.
Its key step: converter tapping finishes, and stays a certain amount of slag in stove; Residue adjustment materials such as rhombspar, magnesite ball can be added according to the slag situation; The top rifle is dropped in the stove, open N
2Valve, flow control is at 4000～40000Nm
3Not etc.; Spatter the slag time length about 3～5 minutes at every turn.
The advantage of this furnace retaining method: 1) need not fettling material, the furnace retaining cost is low than mending material furnace retaining method; 2) the furnace retaining time is short, each about 3 minutes, little to converter production influence; 3) furnace retaining is effective, can reach more than 10,000 stoves.
The shortcoming of this furnace retaining method: facility investment (N that 1) need be higher
2Pipeline laying); 2) the easily sticking cold steel of oxygen rifle influences oxygen rifle work-ing life; 3) the furnace bottom ventilated element easily stops up, and influences smelting technology.
Summary of the invention
The object of the present invention is to provide a kind of method for maintaining converter, can make full use of slag and have certain refractoriness,, improve the fire performance of slag by the slag denaturing treatment.
For achieving the above object, technical solution of the present invention is to adopt converter bottom blowing ventilated element, the rare gas element (N of winding-up
2, Ar) make slag spray hang over the furnace lining surface of converter, can form certain thickness slag layer at furnace lining equally, play the effect of protection furnace lining.
Its concrete steps:
A. converter tapping finishes, check the slag situation, mainly from converter terminal temperature, Free[O] judge, when the converter terminal temperature greater than 1680 ℃ or Free[O] during greater than 800ppm, add a certain proportion of residue adjustment material, the input amount of residue adjustment material is controlled at 5%～15% of total quantity of slag, and (MgO) content of slag is controlled at more than 8%;
B. spray slag, set the bottom blowing flow, the flow control of every ventilated element is at 100Nm
3More than, bottom blown gas house steward operating pressure is sprayed at the surface, furnace wall with modified good slag more than 1.4Mpa;
C. spatter slag and finish, will remain slag and get final product to the greatest extent.
Wherein, adopt converter bottom blowing ventilated element winding-up rare gas element (N
2, Ar) dross.
Described residue adjustment material is rhombspar or magnesite ball etc.
Described bottom blown gas house steward operating pressure is more than 1.4Mpa.
The time of the each bottom blowing dross of described step b was controlled at more than 3 minutes.
The invention has the beneficial effects as follows,
1. adopt the technical equipment of existing top and bottom combined blown converter, utilization bottom blowing ventilated element, nitrogen-blow, argon gas spatter, dross.
2. by the control of bottom blowing flow, can make converter corrode the most serious slag line, molten bath, gudgeon zone effectively and effectively be safeguarded.
3. need not increase the injection system of top blast nitrogen, directly adopt the bottom blowing ventilated element of the top and bottom combined blown converter dross of jetting.
4. the sticking rifle of oxygen rifle, burning rifle, furnace bottom rising and the top and bottom combined blown converter thoroughly having avoided existing in the top blast slag splashing technology easily block up difficult problems such as bottom blowing ventilated element;
5. on the furnace retaining effect, the erosive velocity of significantly slowing down the furnace lining weak part plays good furnace retaining effect.
Embodiment
Employing converter bottom blowing ventilated element of the present invention, the rare gas element (N of winding-up
2, Ar) make slag spray hang over the furnace lining surface of converter, can form certain thickness slag layer at furnace lining equally, play the effect of protection furnace lining.
Its concrete steps: converter tapping finishes, when the converter terminal temperature greater than 1680 ℃ or Free[O] during greater than 800ppm, add a certain proportion of residue adjustment material, mainly contain rhombspar, magnesite ball etc., the input amount of residue adjustment material is controlled at 5%～15% of total quantity of slag, and (MgO) content of slag is controlled at more than 8%; Before and after the converter of fascinating, the adjustment of accelerating slag is merged, and makes the part adhesion of slag in the furnace wall, front and back simultaneously; Set the bottom blowing flow, modified good slag is hung be applied to the surface, furnace wall; The time of bottom blowing dross was controlled at more than 3 minutes; Flow control is according to the lining erosion situation, molten bath, slag line and the furnace bottom of the general top and bottom combined blown converter degree maximum that weathers.Therefore, the flow control of every ventilated element is at 100Nm
3More than.Corrode seriously to make and to increase the bottom blowing flow when burner hearth reaches upper of furnace body greatly, otherwise then reduce flow.
1649 ℃ of converter terminal temperature, Free[O]=602ppm, judging thus that this furnace bottom blows spatters slag and need not to drop into 8% residue adjustment material (rhombspar) residue adjustment again, and the flow with every bottom blowing ventilated element after converter is vertical is adjusted to 300Nm
3About, continued 6 minutes, then will remain slag and outwell, spatter slag and finish.Finish in the blowing of 1134 stoves, it is as follows to adopt laser thickness gauge to measure lining thickness:
Position, molten bath, north: 446mm; Position, molten bath, south: 486mm; Furnace bottom position: 554mm;
Compare the stove labour that does not adopt bottom blowing to spatter slag: the 2# converter, the 2nd stove labour, the 1112nd stove, it is as follows to adopt laser thickness gauge to measure lining thickness:
Position, molten bath, north: 166mm; Position, molten bath, south: 170mm; Furnace bottom position: 409mm
After furnace retaining method of the present invention is adopted in measuring and calculating, lining erosion speed is reduced to below the 0.12mm/ stove, bottom blowing ventilated element obstruction accident does not take place simultaneously, and therefore furnace retaining method of the present invention can compare favourably with present popular top blast slag splashing to a certain extent.
The present invention adopts the original bottom blowing ventilated element of converter; nitrogen-blow, argon gas spatter, the novel process of dross furnace retaining; gas with the certain flow impulse force upwards blows the slag that covers furnace bottom by the bottom blowing ventilated element; cause that slag to furnace wall splash, the attached effect of extension, makes the part adhesion of slag play the effect of protection furnace lining on the furnace wall.
The present invention uses on top and bottom combined blown converter, and effect is remarkable, and the lining erosion speed of slag line, gudgeon part is reduced to the 0.12mm/ stove from original 0.4mm/ stove.For now, obviously slow down the erosive velocity of converter lining, improved the work-ing life of converter lining, also reduced expenses such as repairing stove material simultaneously.
Claims (4)
1. a method for maintaining converter adopts converter bottom blowing ventilated element, the rare gas element (N of winding-up
2, Ar) make slag spray hang over the furnace lining surface of converter, can form certain thickness slag layer on the furnace lining surface like this, play the effect of protection furnace lining; Its concrete steps:
A. converter tapping finishes, check the slag situation, mainly from converter terminal temperature, Free[O] judge, when the converter terminal temperature greater than 1680 ℃ or Free[O] during greater than 800ppm, add a certain proportion of residue adjustment material, the input amount of residue adjustment material is controlled at 5%～15% of total quantity of slag, and (MgO) content of slag is controlled at more than 8%;
B. spray slag, set the bottom blowing flow, the flow control of every ventilated element is at 100Nm
3More than, bottom blown gas house steward operating pressure is sprayed at the surface, furnace wall with modified good slag more than 1.4Mpa;
C. spatter slag and finish, will remain slag and get final product to the greatest extent.
2. method for maintaining converter as claimed in claim 1 is characterized in that, adopts converter bottom blowing ventilated element winding-up rare gas element (N
2, Ar) dross.
3. method for maintaining converter as claimed in claim 1 is characterized in that, described residue adjustment material is rhombspar or magnesite ball etc.
4. method for maintaining converter as claimed in claim 1 is characterized in that, the time of the each bottom blowing dross of described step b was controlled at more than 3 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410099079 CN1796576A (en) | 2004-12-27 | 2004-12-27 | Method for maintaining converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410099079 CN1796576A (en) | 2004-12-27 | 2004-12-27 | Method for maintaining converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1796576A true CN1796576A (en) | 2006-07-05 |
Family
ID=36817891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410099079 Pending CN1796576A (en) | 2004-12-27 | 2004-12-27 | Method for maintaining converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1796576A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101684986B (en) * | 2008-09-25 | 2011-11-16 | 攀钢集团钢铁钒钛股份有限公司 | Maintenance method of gas permeable brick of vanadium extraction converter and production method of converter vanadium extraction |
| CN102337373A (en) * | 2011-11-07 | 2012-02-01 | 秦皇岛首秦金属材料有限公司 | Using method for recovering refining slag and recycling in converter |
| CN102534092A (en) * | 2012-02-10 | 2012-07-04 | 四川省达州钢铁集团有限责任公司 | Method for protecting top-bottom combined blown converter |
| CN102719598A (en) * | 2012-03-29 | 2012-10-10 | 鞍钢股份有限公司 | 90-ton basic oxygen furnace bottom maintenance method |
| CN102094105B (en) * | 2009-12-09 | 2013-01-16 | 攀钢集团钢铁钒钛股份有限公司 | Bottom blowing system for converter |
| CN102994689A (en) * | 2012-11-30 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Method for heat application of low-alkalinity casting residue in steel-making |
| CN107012289A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | A kind of converter bottom method for repairing and mending |
| CN107419061A (en) * | 2017-08-01 | 2017-12-01 | 华北理工大学 | Bottom-blowing of converter dust improve gasification dephosphorization effect method |
| CN108728603A (en) * | 2018-06-28 | 2018-11-02 | 承德建龙特殊钢有限公司 | A kind of method of quick fettling |
| CN109266807A (en) * | 2018-10-29 | 2019-01-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of big flow bottom blowing splashes slag and splashes furnace retaining technique in conjunction with slag phase with top blast |
| CN114262762A (en) * | 2021-10-29 | 2022-04-01 | 武汉钢铁有限公司 | Method, device, medium and equipment for adjusting bottom blowing flow of converter |
| CN114574656A (en) * | 2022-03-18 | 2022-06-03 | 重庆钢铁股份有限公司 | Method for repairing converter |
| CN114774620A (en) * | 2022-05-18 | 2022-07-22 | 邯郸钢铁集团有限责任公司 | Converter bottom gun slag splashing method |
| CN114941050A (en) * | 2022-05-09 | 2022-08-26 | 首钢水城钢铁（集团）有限责任公司 | Method for maintaining furnace lining at trunnion position of converter |
-
2004
- 2004-12-27 CN CN 200410099079 patent/CN1796576A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101684986B (en) * | 2008-09-25 | 2011-11-16 | 攀钢集团钢铁钒钛股份有限公司 | Maintenance method of gas permeable brick of vanadium extraction converter and production method of converter vanadium extraction |
| CN102094105B (en) * | 2009-12-09 | 2013-01-16 | 攀钢集团钢铁钒钛股份有限公司 | Bottom blowing system for converter |
| CN102337373A (en) * | 2011-11-07 | 2012-02-01 | 秦皇岛首秦金属材料有限公司 | Using method for recovering refining slag and recycling in converter |
| CN102534092A (en) * | 2012-02-10 | 2012-07-04 | 四川省达州钢铁集团有限责任公司 | Method for protecting top-bottom combined blown converter |
| CN102534092B (en) * | 2012-02-10 | 2013-08-14 | 四川省达州钢铁集团有限责任公司 | Method for protecting top-bottom combined blown converter |
| CN102719598A (en) * | 2012-03-29 | 2012-10-10 | 鞍钢股份有限公司 | 90-ton basic oxygen furnace bottom maintenance method |
| CN102994689A (en) * | 2012-11-30 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Method for heat application of low-alkalinity casting residue in steel-making |
| CN102994689B (en) * | 2012-11-30 | 2014-09-17 | 武钢集团昆明钢铁股份有限公司 | Method for heat application of low-alkalinity casting residue in steel-making |
| CN107012289A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | A kind of converter bottom method for repairing and mending |
| CN107419061A (en) * | 2017-08-01 | 2017-12-01 | 华北理工大学 | Bottom-blowing of converter dust improve gasification dephosphorization effect method |
| CN107419061B (en) * | 2017-08-01 | 2019-10-18 | 华北理工大学 | Bottom-blowing of converter dust improve gasification dephosphorization effect method |
| CN108728603A (en) * | 2018-06-28 | 2018-11-02 | 承德建龙特殊钢有限公司 | A kind of method of quick fettling |
| CN109266807A (en) * | 2018-10-29 | 2019-01-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of big flow bottom blowing splashes slag and splashes furnace retaining technique in conjunction with slag phase with top blast |
| CN114262762A (en) * | 2021-10-29 | 2022-04-01 | 武汉钢铁有限公司 | Method, device, medium and equipment for adjusting bottom blowing flow of converter |
| CN114574656A (en) * | 2022-03-18 | 2022-06-03 | 重庆钢铁股份有限公司 | Method for repairing converter |
| CN114941050A (en) * | 2022-05-09 | 2022-08-26 | 首钢水城钢铁（集团）有限责任公司 | Method for maintaining furnace lining at trunnion position of converter |
| CN114774620A (en) * | 2022-05-18 | 2022-07-22 | 邯郸钢铁集团有限责任公司 | Converter bottom gun slag splashing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1796576A (en) | Method for maintaining converter | |
| CN102127612B (en) | Slag adjusting and furnace protecting method for controlling rising of converter bottom and furnace wall slag deposition | |
| CN102424886B (en) | Furnace protection process for decarburization converter less slag splashing | |
| CN1040128C (en) | Converter protecting method with splash slag | |
| CN108660282A (en) | A kind of converter deslagging face furnace lining Rapid Maintenance Method | |
| CN103397133A (en) | Method for protecting converter with vanadium slag | |
| CN102864282B (en) | Recarburization method for semi-steel desulfurization | |
| CN108728603A (en) | A kind of method of quick fettling | |
| CN109266807A (en) | A kind of big flow bottom blowing splashes slag and splashes furnace retaining technique in conjunction with slag phase with top blast | |
| CN113930574A (en) | Slag splashing fettling method beneficial to furnace bottom maintenance | |
| CN105238903A (en) | Method for achieving splashing slag furnace protecting work by means of converter gas | |
| CN104673960A (en) | Method for splashing slag of converter for protecting furnace | |
| CN109652606B (en) | Low-calorific-value molten iron converter smelting method | |
| CN102373311B (en) | Slag modification method of stainless steel smelting end slag used for converter splash protection | |
| CN103397132A (en) | Method for enhancing erosion resistance of vanadium extraction converter lining | |
| CN114015828A (en) | Slag splashing furnace protection method for modifying converter slag through bottom blowing powder injection | |
| CN104789733B (en) | A kind of maintaining method of converter lining | |
| CN102344984A (en) | Semisteel smelting and slag remaining method under dry dedusting conduction | |
| CN103773915B (en) | Control method for steel tapping of converter | |
| CN101684986B (en) | Maintenance method of gas permeable brick of vanadium extraction converter and production method of converter vanadium extraction | |
| CN103525971B (en) | Vanadium slag modifier and preparation method thereof, and vanadium-extracting revolving furnace slag-splashing furnace-protecting method | |
| CN1257134A (en) | Anti-impringement protective layer for tuyere of blast furnace and making method thereof | |
| CN113265504B (en) | Operation method for splashing double slag of converter | |
| CN1064714C (en) | Method for reforming slags system of smelting steel with low-Si molten iron or semisteel by using slag inclusion of converter as slag modifier | |
| CN103820598B (en) | A kind of boron mud is used for residue adjustment and the furnace retaining method of slag splashing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |