CN107083469A - The method for reducing steelmaking converter furnace bottom - Google Patents
The method for reducing steelmaking converter furnace bottom Download PDFInfo
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- CN107083469A CN107083469A CN201710322427.7A CN201710322427A CN107083469A CN 107083469 A CN107083469 A CN 107083469A CN 201710322427 A CN201710322427 A CN 201710322427A CN 107083469 A CN107083469 A CN 107083469A
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- furnace bottom
- steel
- stove
- converter
- ferrosilicon
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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
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- 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 metallurgical technology field, especially for a kind of method for reducing steelmaking converter furnace bottom.Furnace bottom rising causes converter dischargeable capacity to diminish during for existing converter smelting, dephosphorization effect is deteriorated, the problems such as easy splash, and the present invention provides a kind of method for reducing steelmaking converter furnace bottom, comprises the following steps：After each stove steel-making tapping terminates, furnace bottom thickness is measured；When furnace bottom thickness reaches more than the 90% of new block stove furnace bottom thickness, next stove stays the 4~8% of steel converter nominal capacity after smelting tapping, stays after steel converter shaking zero-bit, and adds into stove ferrosilicon 10~20kg/t steel, top blast 30~60s of oxygen, pours out molten steel and clinker.The present invention is reacted by ferrosilicon in suitable oxygen blast condition, consumes clinker, and simple to operate, effect is notable, with obvious economic benefit.
Description
Technical field
The invention belongs to metallurgical technology field, especially for a kind of method for reducing steelmaking converter furnace bottom.
Background technology
Because basicity of slag is higher during pneumatic steelmaking, content of MgO meets or exceeds saturation value, the tapping of falling stove rear hearth in slag
Temperature is reduced, and part high-melting-point substances (MgO, C2S, C3S) are separated out, slag viscosity increase, except part clinker is linked at when splashing slag
It is outer on furnace wall, furnace lining, furnace bottom is largely stayed in, the magnesia carbon brick periclase crystal combination with furnace bottom, so as to cause furnace bottom rising.Stove
Bottom causes reaction in furnace space to diminish after going up, and dephosphorization effect is deteriorated, while being also easy to cause splash, increases the same of steel-making cost
When bring security risk.Increasingly protruded with the popularization and application for staying slag charging technology, the problem of furnace bottom rising, influence converter life
Produce direct motion.
The document report of furnace bottom rising has been controlled in existing patent document.Such as patent document " control converter bottom
The slag removing and furnace protecting method gone up with furnace wall accumulated slag ", application number：201110037848.8 control steelmaking converter furnace bottom there is provided one kind
Residue adjustment and the protecting method with splash slag gone up with furnace wall accumulated slag, is solved at present using the furnace bottom heap occurred after traditional slag splashing technique
Slag go up and wall lining clinker accumulation causes converter dischargeable capacity to diminish, body of heater centre-of gravity shift the problems such as.The side of the invention
Method is characterized in：Using two step Slag modification methods, first time residue adjustment is that before tapping, boron mud-magnesia slag adjusting agent, reduction are added into stove
Slag viscosity, can prevent the unilateral wall lining clinker in tapping process from accumulating and furnace bottom slagging, and subsequent tapping, which is used, stays slag not
Stay steel to operate, implement second of residue adjustment after the completion of tapping, i.e., to remain in the slag in stove add magnesium carbonaceous slag adjusting agent (coke powder and
Containing magnesium oxide material), then implement slag splashing technique.Using the invention Converter Bottom Rising and furnace wall accumulated slag can be controlled to become
It is thick, it is ensured that furnace wall thickness uniformity, hence it is evident that to improve slag splashing effect, increase substantially the converter lining life-span.
The invention mainly controls furnace bottom and furnace lining to be stained with slag by residue adjustment, belongs to the method for prevention furnace bottom rising, but its
Do not point out when how reducing furnace bottom after furnace bottom rising to certain altitude.
Patent document " a kind of method of control rising splash slag in battom of converter ", application number：2003118577.0, its step
For：While every stove steel blowing end point puies forward oxygen rifle, fluorite is uniformly added into stove by oxygen stream；After tapping terminates, according to
Oxygen content in the temperature of converter terminal slag, iron oxide and furnace bottom slag, it is determined that from splashing slag charge；Oxygen rifle position is adjusted, makes oxygen rifle
The distance between shower nozzle and the furnace bottom top of the slag are remained in the range of 0.6~1.5m；Nitrogen offerings intensity is in 3.3~4.0NM3/ tons of steel
In the range of；Start to splash slag, with nitrogen blown converter time control at 1~4 minute；Terminate to splash slag when slag is also uncured.The invention
Fluorite is added into stove to carry out splashing slag, reduces slag melting to reduce furnace bottom using fluorite.Due to fluorite to converter lining and
Equipment has corrosion function, and existing converter smelting process disables fluorite substantially.
The content of the invention
The technical problem to be solved in the present invention is：Furnace bottom rising causes converter dischargeable capacity to become during existing converter smelting
The problems such as small, dephosphorization effect variation, easy splash.
The present invention solve technical problem technical scheme be：A kind of method for reducing steelmaking converter furnace bottom is provided.The present invention
Method by monitoring furnace bottom thickness in real time, using staying steel to operate after furnace bottom thickness reaches certain limit, and adds into stove silicon
Iron, oxygen blast reduces furnace bottom.
The method of the reduction steelmaking converter furnace bottom of the present invention, comprises the following steps：
After each stove steel-making tapping terminates, furnace bottom thickness is measured；Start to increase to new block stove again after furnace bottom is minimized
Furnace bottom thickness more than 90% when, next stove stays steel after smelting tapping, stay that steel amount is BOF nominal capacity 4~8%, stays after steel
Zero-bit is shaken into converter, and adds into stove ferrosilicon, top blast 30~60s of oxygen pours out molten steel and clinker.
Wherein, in the method for above-mentioned reduction steelmaking converter furnace bottom, described measurement is using laser thickness gauge or artificial progress
Measurement.
Wherein, in the method for above-mentioned reduction steelmaking converter furnace bottom, described top blowing oxygen air-blowing oxygen intensity is 3~4m3/t·
Min, 0.8~1.2m of oxygen blast oxygen rifle distance steel liquid level.
Wherein, in the method for above-mentioned reduction steelmaking converter furnace bottom, the ferrosilicon that described ferrosilicon is silicone content >=75wt%.
Wherein, in the method for above-mentioned reduction steelmaking converter furnace bottom, the addition of the ferrosilicon is 10~20kg/t steel.
Beneficial effects of the present invention are：The present invention provides a kind of method for reducing steelmaking converter furnace bottom, by monitoring in real time
Furnace bottom thickness, when furnace bottom thickness reaches more than the 90% of new stove furnace bottom thickness, stays steel addition ferrosilicon and oxygen blast is removed the gred, from
And reduce furnace bottom thickness.The present invention is reacted by ferrosilicon in suitable oxygen blast condition, consumes clinker, and simple to operate, effect shows
Write, with important economic benefit.
Embodiment
The present invention provides a kind of method for reducing steelmaking converter furnace bottom, comprises the following steps：
After each stove steel-making tapping terminates, furnace bottom thickness is measured；Start to increase to new block stove again after furnace bottom is minimized
Furnace bottom thickness more than 90% when, next stove stays steel after smelting tapping, stay that steel amount is BOF nominal capacity 4~8%, stays after steel
Zero-bit is shaken into converter, and adds into stove ferrosilicon, top blast 30~60s of oxygen pours out molten steel and clinker.
During using pneumatic steelmaking, with the progress of smelting, the moieties in converter bottom, which enter in clinker, discharges so that
Furnace bottom is reduced, and be typically reduced to new stove furnace bottom thickness 70~80% can normally smelt, and is further carried out with smelting, furnace bottom
It will rise.
The trend of the furnace bottom rising of monitoring in real time of the invention, using laser thickness gauge or manually measures, works as furnace bottom rising
To new stove furnace bottom thickness more than 90% when, then start slagging-off.Present invention slagging-off, which is used, to be stayed steel into stove, adds ferrosilicon and oxygen blast
Mode carry out, add after ferrosilicon and oxygen blast, silicon aoxidizes the SiO to form acidity2, with the alkali of furnace bottom under the impact of oxygen jet
Property clinker react, so as to consume clinker, reach the purpose of reduction furnace bottom thickness.
Penetration depth and impact area of the highly main influence oxygen jet of top blast oxygen intensity and oxygen rifle to molten bath.Work as oxygen
Gas intensity is too low or during oxygen rifle excessive height, can make it that oxygen rifle jet impulse depth is inadequate, it is impossible to melt furnace bottom well
On clinker or steel so that do not reach reduction furnace bottom effect；When oxygen intensity is too high or during highly too low oxygen rifle, can make oxygen
Rifle jet causes excessive shock power to furnace bottom, so that big pit occurs in furnace bottom, or makes furnace bottom occur significantly declining, shadow
Converter is rung normally to smelt.
In the present invention, in order to reduce converter bottom, and protection stove bottom, not by erosion, top blowing oxygen air-blowing oxygen strength control is
3~4m3/ tmin, oxygen blast oxygen rifle distance steel liquid surface height controlling is 0.8~1.2m.
In addition, the present invention adds ferrosilicon to reduce furnace bottom, using silicone content >=75wt% ferrosilicon.Can shape after ferrosilicon fusing
Into acid SiO2, while the temperature of molten steel in stove can be raised.Acid SiO2(alkalescence can be mainly with adhesive on furnace bottom
CaO) reacted, so as to reach the purpose of reduction furnace bottom.The addition of ferrosilicon needs strict control, when addition is excessive, stove
SiO in the too high and clinker of interior heating2Too high levels, meeting Eroded furnace bottom, make furnace bottom thickness uncontrolled；When addition is very few again
Furnace bottom can not be effectively reduced, for counterbalance effect, ferrosilicon addition is 10~20kg/t steel in the present invention.
Explanation is further explained to the embodiment of the present invention with reference to embodiment, but does not indicate that and sends out this
Bright protection domain is limited in described in embodiment in scope.
Embodiment 1 reduces steelmaking converter furnace bottom with the inventive method
Certain factory 120t steelmaking converters, furnace bottom thickness is 1.3m during new block stove, and medium and high carbon steel, furnace bottom rising are smelted due to long-term
It is more severe.The problem of to solve furnace bottom rising, using the inventive method, monitor furnace bottom thickness in real time by laser thickness gauge.
Tapping measures furnace bottom thickness for 1.2m after terminating, exceeded the 90% of new block stove furnace bottom thickness；In the tapping of next stove smelting endpoint
Shi Liugang 4.8t, stay and utilize top blow oxygen lance after converter is shaken into zero-bit, and the addition ferrosilicon 100kg into stove, addition ferrosilicon after steel
The oxygen blast 30s into stove, oxygen blast intensity is 3m3/ tmin, oxygen blast control of lance position is between 0.8~1m.Oxygen blast terminate after not
Slag is splashed again, molten steel and clinker is poured out, and carries out thickness measuring, is obtained furnace bottom thickness for 1m, is the 77% of new stove furnace bottom thickness, reaches
Furnace bottom thickness during normal smelting.
Embodiment 2 reduces steelmaking converter furnace bottom with the inventive method
Certain factory 120t steelmaking converters, furnace bottom thickness is 1.3m during new block stove, and medium and high carbon steel, furnace bottom rising are smelted due to long-term
It is more severe.The problem of to solve furnace bottom rising, using the inventive method, monitor furnace bottom thickness in real time by laser thickness gauge.
Tapping measures furnace bottom thickness for 1.4m after terminating, exceeded the 90% of new block stove furnace bottom thickness, and go out in next stove smelting endpoint
Steel 9.6t is stayed during steel, stays and utilizes top blowing oxygen after converter is shaken into zero-bit, and the addition ferrosilicon 150kg into stove, addition ferrosilicon after steel
Rifle oxygen blast 50s into stove, oxygen blast intensity is 3.5m3/ tmin, oxygen blast control of lance position is between 1~1.1m.Oxygen blast terminates
Slag is no longer splashed afterwards, molten steel and clinker is poured out, and carries out thickness measuring, is obtained furnace bottom thickness for 1.15m, is new stove furnace bottom thickness
88%, furnace bottom thickness when having reached normal smelting.
Embodiment 3 reduces steelmaking converter furnace bottom with the inventive method
Certain factory 120t steelmaking converters, furnace bottom thickness is 1.3m during new block stove, and medium and high carbon steel, furnace bottom rising are smelted due to long-term
It is more severe.The problem of to solve furnace bottom rising, using the inventive method, monitor furnace bottom thickness in real time by laser thickness gauge.
Tapping measures furnace bottom thickness for 1.3m after terminating, exceeded the 90% of new block stove furnace bottom thickness, and go out in next stove smelting endpoint
Steel 8t is stayed during steel, stays and utilizes top blow oxygen lance after converter is shaken into zero-bit, and the addition ferrosilicon 120kg into stove, addition ferrosilicon after steel
The oxygen blast 60s into stove, oxygen blast intensity is 4m3/ tmin, oxygen blast control of lance position is in 1.1~1.2m.Oxygen blast terminate after no longer
Slag is splashed, molten steel and clinker is poured out, and carries out thickness measuring, furnace bottom thickness is obtained for 1.07m, is the 82% of new stove furnace bottom thickness, reaches
Furnace bottom thickness during normal smelting.
Claims (6)
1. reduce the method for steelmaking converter furnace bottom, it is characterised in that comprise the following steps：
After each stove steel-making tapping terminates, furnace bottom thickness is measured；Start to increase to new block stove furnace bottom again after furnace bottom is minimized
Thickness more than 90% when, next stove stays steel after smelting tapping, stay that steel amount is BOF nominal capacity 4~8%, and staying will turn after steel
Stove shakes zero-bit, and adds into stove ferrosilicon, and top blast 30~60s of oxygen pours out molten steel and clinker.
2. the method for reduction steelmaking converter furnace bottom according to claim 1, it is characterised in that：Described measurement uses laser
Calibrator is manually measured.
3. the method for reduction steelmaking converter furnace bottom according to claim 1, it is characterised in that：Described top blowing oxygen air-blowing oxygen
Intensity is 3~4m3/t·min。
4. the method for reduction steelmaking converter furnace bottom according to claim 1, it is characterised in that：Described oxygen blast oxygen rifle distance
0.8~1.2m of steel liquid level.
5. the method for reduction steelmaking converter furnace bottom according to claim 1, it is characterised in that：Described ferrosilicon is silicone content
>=75wt% ferrosilicon.
6. the method for reduction steelmaking converter furnace bottom according to claim 1, it is characterised in that：The addition of the ferrosilicon is
10~20kg/t steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710322427.7A CN107083469A (en) | 2017-05-09 | 2017-05-09 | The method for reducing steelmaking converter furnace bottom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710322427.7A CN107083469A (en) | 2017-05-09 | 2017-05-09 | The method for reducing steelmaking converter furnace bottom |
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| Publication Number | Publication Date |
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| CN107083469A true CN107083469A (en) | 2017-08-22 |
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ID=59612550
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| CN201710322427.7A Pending CN107083469A (en) | 2017-05-09 | 2017-05-09 | The method for reducing steelmaking converter furnace bottom |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110408738A (en) * | 2019-08-30 | 2019-11-05 | 攀钢集团攀枝花钢钒有限公司 | Steelmaking converter furnace bottom method |
| CN110512045A (en) * | 2019-09-27 | 2019-11-29 | 阳春新钢铁有限责任公司 | A method of control Converter Bottom Rising |
| CN111500817A (en) * | 2020-05-06 | 2020-08-07 | 攀钢集团西昌钢钒有限公司 | Method for washing bottom of converter |
| CN113215348A (en) * | 2021-05-13 | 2021-08-06 | 山东鲁丽钢铁有限公司 | Method for controlling rising of 120t converter bottom by using high-temperature oxygen jet flow |
| CN114058769A (en) * | 2021-10-27 | 2022-02-18 | 重庆钢铁股份有限公司 | Method for reducing converter bottom under high-iron-steel ratio smelting condition of converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619374A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | Method for controlling furnace bottom by adding ferro-silicon |
| CN102127612A (en) * | 2011-02-15 | 2011-07-20 | 江苏大学 | Slag adjusting and furnace protecting method for controlling rising of converter bottom and furnace wall slag deposition |
| CN102994687A (en) * | 2012-11-27 | 2013-03-27 | 攀钢集团攀枝花钢钒有限公司 | Method for reducing thickness of converter bottom |
| CN103114168A (en) * | 2013-02-26 | 2013-05-22 | 莱芜钢铁集团有限公司 | Method for removing residual steel slag at converter bottom |
-
2017
- 2017-05-09 CN CN201710322427.7A patent/CN107083469A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619374A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | Method for controlling furnace bottom by adding ferro-silicon |
| CN102127612A (en) * | 2011-02-15 | 2011-07-20 | 江苏大学 | Slag adjusting and furnace protecting method for controlling rising of converter bottom and furnace wall slag deposition |
| CN102994687A (en) * | 2012-11-27 | 2013-03-27 | 攀钢集团攀枝花钢钒有限公司 | Method for reducing thickness of converter bottom |
| CN103114168A (en) * | 2013-02-26 | 2013-05-22 | 莱芜钢铁集团有限公司 | Method for removing residual steel slag at converter bottom |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110408738A (en) * | 2019-08-30 | 2019-11-05 | 攀钢集团攀枝花钢钒有限公司 | Steelmaking converter furnace bottom method |
| CN110512045A (en) * | 2019-09-27 | 2019-11-29 | 阳春新钢铁有限责任公司 | A method of control Converter Bottom Rising |
| CN110512045B (en) * | 2019-09-27 | 2021-07-30 | 阳春新钢铁有限责任公司 | Method for controlling rising of converter bottom |
| CN111500817A (en) * | 2020-05-06 | 2020-08-07 | 攀钢集团西昌钢钒有限公司 | Method for washing bottom of converter |
| CN113215348A (en) * | 2021-05-13 | 2021-08-06 | 山东鲁丽钢铁有限公司 | Method for controlling rising of 120t converter bottom by using high-temperature oxygen jet flow |
| CN113215348B (en) * | 2021-05-13 | 2022-07-22 | 山东鲁丽钢铁有限公司 | Method for controlling rising of 120t converter bottom by using high-temperature oxygen jet flow |
| CN114058769A (en) * | 2021-10-27 | 2022-02-18 | 重庆钢铁股份有限公司 | Method for reducing converter bottom under high-iron-steel ratio smelting condition of converter |
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Application publication date: 20170822 |