CN114085942A - Method for reducing slag surface height in converter tapping process - Google Patents
Method for reducing slag surface height in converter tapping process Download PDFInfo
- Publication number
- CN114085942A CN114085942A CN202111256778.5A CN202111256778A CN114085942A CN 114085942 A CN114085942 A CN 114085942A CN 202111256778 A CN202111256778 A CN 202111256778A CN 114085942 A CN114085942 A CN 114085942A
- Authority
- CN
- China
- Prior art keywords
- converter
- slag
- tapping
- blowing
- nitrogen
- 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
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
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 belongs to the field of converter steelmaking, and relates to a method for reducing the slag level height in the converter tapping process. The method reduces the height of the slag surface by adopting nitrogen purging, point blowing and other modes, does not influence molten steel hydrogen control, furnace lining maintenance control, reduces the smelting period, effectively reduces the slag surface of the converter, and ensures stable and smooth production.
Description
Technical Field
The invention belongs to the field of converter steelmaking, and relates to a method for reducing the height of a slag surface in the converter tapping process.
Background
Smelting in a converter to the end point, wherein the slag surface is high in the tapping process: 1. the steel slag mixed flow can be caused, so that the molten steel is rephosphorized, and the phosphorus control of the molten steel is seriously influenced; 2. if a large amount of discharged molten steel is not properly treated, the molten steel is not deoxidized well, and safety accidents are induced in the pouring process; 3. the furnace mouth does not continuously flow slag, so that slag particles are prevented from entering a steel ladle, molten steel impacts the inner wall of the steel ladle, and the service life of the steel ladle is influenced; 4. a large amount of steel slag is sprayed out from a furnace mouth, and the safety of the cable of the steel car is threatened.
The prior art for controlling the slag surface height in the converter tapping process comprises the following steps: 1. staying an oxygen lance nozzle in an interval of-300 mm below the horizontal position of a furnace mouth, blowing oxygen for 2-3 s, then closing the oxygen, and then tapping; 2. the slag surface is high in the tapping process, and tapping is carried out after slag is poured in front of the furnace; 3. and adding auxiliary materials such as raw dolomite and the like into the converter after the converter blowing is finished, then blowing the slag surface through high-pressure nitrogen, tapping after the blowing is finished, and continuously adding a slag pressing agent into the converter during the tapping process until the tapping is finished. The method comprises the following steps: the slag surface is reduced through oxygen purging, so that on one hand, the converter lining is eroded by oxygen scouring, on the other hand, the slag is foamed due to improper operation, the slag surface does not fall and reversely rises, the subsequent operation is difficult, and the production rhythm of the converter is influenced; the mode of deslagging in front of the converter not only causes erosion to the large surface in front of the converter, but also has long time consumption and large temperature loss; after the blowing is finished, auxiliary materials such as dolomite and the like are added into the furnace to reduce the slag surface and influence the quality of molten steel, and meanwhile, a slag pressing agent is continuously added into the furnace in the tapping process, which indicates that the slag surface is not effectively reduced.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for reducing the slag level during the tapping process of a converter, which adopts nitrogen purging, spot blowing and other methods to reduce the slag level.
In order to achieve the purpose, the invention provides the following technical scheme: a method for reducing the slag level during tapping of a converter, characterized by comprising the steps of: and after the gun is lifted at the blowing end point, the slag structure is damaged by blowing nitrogen, the slag surface is high during steel tapping, the converter is shaken to directly carry out point blowing and then nitrogen is blown, the reaction in the converter is uniform, the temperature of molten steel is compensated, the slag structure is damaged, and the corrosion acceleration of the converter front large surface caused by steel tapping after slag dumping in the front of the converter is avoided.
Optionally, after lifting the lance at the blowing end point, blowing nitrogen, raising the nozzle of the oxygen lance to be 1000-2000 mm below the horizontal position of the furnace mouth, starting high-pressure nitrogen to blow for 10-20 s, achieving the purposes of destroying the structure of the furnace slag and reducing the slag surface, and directly tapping after blowing.
Optionally, after point blowing, nitrogen is blown, when the slag surface is high and the reaction in the converter is severe during tapping, the reaction in the converter is not uniform, the converter is immediately shaken and point blowing is carried out, the oxygen lance is lowered to the lowest lance position during normal smelting, the oxygen supply flow is controlled according to dynamic flow, the lance is lifted after blowing is carried out for 10-15 s, the nozzle of the oxygen lance is raised to be 1000-2000 mm below the horizontal position of the furnace mouth, and high-pressure nitrogen is started to blow for 10-20 s, so that tapping is directly carried out.
Optionally, auxiliary materials and slag pressing agents are not added in the tapping process.
Optionally, tapping after slag dumping in front of the converter is avoided, when the slag surface is found to be high in the tapping process, directly blowing the converter by a lower gun after the converter is just shaken, and directly tapping after nitrogen is point-blown.
The invention has the beneficial effects that: the method for reducing the slag level height in the converter tapping process effectively controls molten steel hydrogen control, reduces the erosion of the converter lining, reduces the smelting period, has small melt temperature loss, strong operation stability, is safe and controlled, and is beneficial to stable and smooth production; meanwhile, the traditional process thought is changed, and the method is applied to the continuous production organization of the current steel plant from the essence of problems, and has strong operability and obvious effect.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The invention relates to a method for reducing the height of a slag surface in the tapping process of a converter, wherein the height of the slag surface in the tapping process is usually caused by nonuniform reaction in the converter, so that the violent reaction in the converter is caused by the shaking of the converter in the tapping process to induce the rise of the slag surface; secondly, the end point is over-oxidized seriously, so that the slag is excessively foamed, and the slag surface is high in the tapping process caused by poor end point control. The height of the slag surface is reduced by adopting nitrogen purging, point blowing and other modes, the method does not influence molten steel hydrogen control, furnace lining maintenance is controllable, the smelting period is reduced, the slag surface of the converter is effectively reduced, and stable and smooth production is ensured.
The invention relates to a method for reducing the height of a slag surface in the tapping process of a converter, which comprises the following steps: and after the gun is lifted at the blowing end point, the slag structure is destroyed by blowing nitrogen, the slag surface is high during tapping, the converter is shaken to directly carry out point blowing and then nitrogen is blown, the slag structure is destroyed while the reaction in the converter and the temperature of molten steel are compensated, no auxiliary material and slag pressing agent are added to press slag, and the phenomenon that the erosion of the converter front large surface is accelerated by tapping after slag dumping in front of the converter is avoided.
After lifting a lance at the blowing end point, blowing nitrogen, raising a nozzle of an oxygen lance to be 1000-2000 mm below the horizontal position of a furnace mouth, starting high-pressure nitrogen (nitrogen supply flow during slag splashing and furnace protection) to blow for 10-20 s, so that the purposes of destroying a slag structure and reducing a slag surface are achieved, and directly tapping after blowing; blowing nitrogen after point blowing, when the slag surface is high and the reaction in the converter is severe during tapping, namely the reaction in the converter is uneven, immediately shaking the converter and performing point blowing, lowering an oxygen lance to the lowest lance position during normal smelting, controlling the oxygen supply flow according to dynamic flow, lifting the lance after blowing for 10-15 s, raising the nozzle of the oxygen lance to 1000-2000 mm below the horizontal position of a furnace mouth, and directly tapping after starting high-pressure nitrogen blowing for 10-20 s; and (4) tapping after deslagging in front of the converter is avoided, when the slag surface is found to be high in the tapping process, directly blowing the converter by a lower gun after the converter is just shaken, and directly tapping after nitrogen is swept by the point.
The invention effectively controls the hydrogen control of the molten steel, reduces the erosion of the converter lining, reduces the smelting period, has small melt temperature loss, strong operation stability, is safely controlled, and is beneficial to stable and smooth production.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (5)
1. A method for reducing the slag level during tapping of a converter, characterized by comprising the steps of: and after the gun is lifted at the blowing end point, the slag structure is damaged by blowing nitrogen, the slag surface is high during steel tapping, the converter is shaken to directly carry out point blowing and then nitrogen is blown, the reaction in the converter is uniform, the temperature of molten steel is compensated, the slag structure is damaged, and the corrosion acceleration of the converter front large surface caused by steel tapping after slag dumping in the front of the converter is avoided.
2. A method for reducing the slag level during tapping of a converter according to claim 1, wherein: and (3) blowing nitrogen after lifting the lance at the blowing end point, raising the nozzle of the oxygen lance to be 1000-2000 mm below the horizontal position of the furnace mouth, starting high-pressure nitrogen for blowing for 10-20 s, so as to achieve the purposes of destroying the structure of the furnace slag and reducing the slag surface, and directly tapping after blowing.
3. A method for reducing the slag level during tapping of a converter according to claim 1, wherein: and blowing nitrogen after point blowing, when the slag surface is high and the reaction in the converter is severe during tapping, namely the reaction in the converter is uneven, immediately shaking the converter and performing point blowing, lowering the oxygen lance to the lowest lance position during normal smelting, controlling the oxygen supply flow according to dynamic flow, lifting the lance after blowing for 10-15 s, raising the nozzle of the oxygen lance to 1000-2000 mm below the horizontal position of the furnace mouth, and directly tapping after starting high-pressure nitrogen to blow for 10-20 s.
4. A method for reducing the slag level during tapping of a converter according to claim 1, wherein: auxiliary materials and slag pressing agents are not added in the tapping process.
5. A method for reducing the slag level during tapping of a converter according to claim 1, wherein: and (4) tapping after deslagging in front of the converter is avoided, when the slag surface is found to be high in the tapping process, directly blowing the converter by a lower gun after the converter is just shaken, and directly tapping after nitrogen is swept by the point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111256778.5A CN114085942A (en) | 2021-10-27 | 2021-10-27 | Method for reducing slag surface height in converter tapping process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111256778.5A CN114085942A (en) | 2021-10-27 | 2021-10-27 | Method for reducing slag surface height in converter tapping process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114085942A true CN114085942A (en) | 2022-02-25 |
Family
ID=80297891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111256778.5A Pending CN114085942A (en) | 2021-10-27 | 2021-10-27 | Method for reducing slag surface height in converter tapping process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114085942A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102719595A (en) * | 2012-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Method for handling high slag surface in converter blowing endpoint |
| JP2015224387A (en) * | 2014-05-30 | 2015-12-14 | 新日鐵住金株式会社 | Defoaming agent and defoaming method |
| CN109136455A (en) * | 2018-10-15 | 2019-01-04 | 马鞍山钢铁股份有限公司 | A method of it bessemerizing terminal slag bubble and quickly eliminates |
| CN110616290A (en) * | 2019-09-30 | 2019-12-27 | 山东钢铁股份有限公司 | Converter single slag remaining smelting method capable of reducing final slag height |
| CN111100964A (en) * | 2020-02-21 | 2020-05-05 | 山东钢铁股份有限公司 | Method for improving foaming of converter final slag |
| CN112322824A (en) * | 2020-10-12 | 2021-02-05 | 天津天钢联合特钢有限公司 | Method for controlling slag overflow in converter tapping process |
-
2021
- 2021-10-27 CN CN202111256778.5A patent/CN114085942A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102719595A (en) * | 2012-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Method for handling high slag surface in converter blowing endpoint |
| JP2015224387A (en) * | 2014-05-30 | 2015-12-14 | 新日鐵住金株式会社 | Defoaming agent and defoaming method |
| CN109136455A (en) * | 2018-10-15 | 2019-01-04 | 马鞍山钢铁股份有限公司 | A method of it bessemerizing terminal slag bubble and quickly eliminates |
| CN110616290A (en) * | 2019-09-30 | 2019-12-27 | 山东钢铁股份有限公司 | Converter single slag remaining smelting method capable of reducing final slag height |
| CN111100964A (en) * | 2020-02-21 | 2020-05-05 | 山东钢铁股份有限公司 | Method for improving foaming of converter final slag |
| CN112322824A (en) * | 2020-10-12 | 2021-02-05 | 天津天钢联合特钢有限公司 | Method for controlling slag overflow in converter tapping process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108950126B (en) | Method for quickly reducing height of converter bottom | |
| CN103014224B (en) | Splashed slag furnace protection method for vanadium extraction converter | |
| CN103397133B (en) | Method for protecting converter with vanadium slag | |
| CN110616290B (en) | Converter single slag remaining smelting method capable of reducing final slag height | |
| CN113930574A (en) | Slag splashing fettling method beneficial to furnace bottom maintenance | |
| KR100334947B1 (en) | Method of vacuum decarburization /refining of molten steel and apparatus thereor | |
| CN107083469A (en) | The method for reducing steelmaking converter furnace bottom | |
| CN109266807A (en) | A kind of big flow bottom blowing splashes slag and splashes furnace retaining technique in conjunction with slag phase with top blast | |
| CN111270041B (en) | Method for reducing phosphorus content in low-phosphorus steel production tapping process of dephosphorization furnace | |
| CN110317920B (en) | Maintenance method for furnace bottom of top-bottom combined blown converter | |
| JPH10176212A (en) | Method for preventing flow-out of slag at the time of discharging molten steel | |
| CN114085942A (en) | Method for reducing slag surface height in converter tapping process | |
| KR101300617B1 (en) | Converter refining method and device of molten steel using residual slag | |
| CN113088620A (en) | Maintenance method of furnace lining of vanadium extraction device | |
| CA1157660A (en) | Method for producing steel having a low hydrogen content in an oxygen blow-through converter | |
| JP4065225B2 (en) | Dephosphorization method for hot metal | |
| CN113265504A (en) | Operation method for splashing double slag of converter | |
| JPH01127613A (en) | Method and apparatus for refining molten metal | |
| CN112760449A (en) | Smelting method of slag steel used by Consteel electric furnace | |
| JP3333339B2 (en) | Converter steelmaking method for recycling decarburized slag | |
| CN114058769A (en) | Method for reducing converter bottom under high-iron-steel ratio smelting condition of converter | |
| KR100758435B1 (en) | A Method for Removing Reclained lump steel on the Converter Throat Using Nitrogen Blowing | |
| CN116814898B (en) | Method for reducing total iron in furnace door slag of electric furnace | |
| JP3952846B2 (en) | Method for producing low phosphorus hot metal | |
| JP3668172B2 (en) | Hot metal refining method |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220225 |
|
| RJ01 | Rejection of invention patent application after publication |