CN105154626A - Method for controlling ladle furnace (LF) refining slag system - Google Patents
Method for controlling ladle furnace (LF) refining slag system Download PDFInfo
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- CN105154626A CN105154626A CN201510646073.2A CN201510646073A CN105154626A CN 105154626 A CN105154626 A CN 105154626A CN 201510646073 A CN201510646073 A CN 201510646073A CN 105154626 A CN105154626 A CN 105154626A
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- ladle
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- 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
Abstract
The invention discloses a method for controlling ladle furnace (LF) refining slag system. The method comprises the steps of adding aluminum preliminary deoxidation agents enough to remove 99% of free oxygen in molten steel into the molten steel before steel tapping or in the process from steel tapping to steel ladle forming; and adding cast thermal-state refined slag with the steel amount being 6.5-7.5 kg/t into steel ladles. According to the method, the refined slag is recovered and reused in the slagging process of the LF, and accordingly refining and slagging cost can be lowered; casting remaining steel and furnace slag heat can be recovered, discharging is reduced, and the method has quite important practical significance to improvement of the comprehensive steel slag recycling level of enterprises.
Description
Technical field
The invention belongs to field of steel-making, be specifically related to a kind of control method of LF furnace refining slag system.
Background technology
Steel market state at a low ebb always in recent years, enterprises cost pressure is large, and resource environment constraint is simultaneously becoming tight, energy-saving and emission-reduction arduous task.Steel share Laiwu, mountain special steel division department of branch office silver district's year output of steel 2,300,000 tons in front of the mountains, refining steel output is more than 1,000,000 tons, and the LF stove refining slag of generation is at about 20,000 tons.Refining furnace uses large quantities of lime, fluorite slag making, add reductor makes slag have good reductibility simultaneously, after having watered to molten steel, slag still presents high alkalinity, low oxidative, has the feature of comparatively high temps, but at present for thermal slag, although there is part document to disclose its application as the fusing assistant of converter and electric furnace, but these application focus mostly in the recycling for heat, as utilized the amount of residual heat will of slag, improve stability and the thermo-efficiency of electrode, but it still exists contaminate environment, the problem that refining slag is recycled can not be solved.
Summary of the invention
The object of the present invention is to provide a kind of control method of low cost LF furnace refining slag system, refining slag can be reclaimed by the method utilizes in refining furnace slagging process again, refining slag making cost can be reduced, the remaining steel of casting and heat of slags can also be reclaimed, emissions reduction simultaneously.
Control method of the present invention adopts following steps to carry out:
In the process of ladle, add to molten steel the aluminium matter pre-deoxidant being enough to remove by the free oxygen in molten steel at least 99% before tapping or in tapping.
Preferably, the method also can comprise: before entering LF stove, adds the hot refining slag that the casting of 6.5-7.5kg/t steel amount is complete in ladle; Described hot refining slag is the hot refining slag of institute's steelmaking kind.
Preferably, described method comprises further: when LF refining furnace, adds 2.5-3.0kg/t steel amount lime, add the fluorite of 0.5-1kg/t steel amount in LF refining furnace in LF refining furnace.
Preferably, described method comprises further: the Al controlling the slag in ladle refining furnace
2o
3weight percent is 15%-20%.
Preferably, described method comprises further: adopt the FeO weight content of the slag in carbide of calcium and/or silicon carbide control ladle refining furnace and MnO weight content sum to be no more than 0.5%.
Described method also can comprise the basicity controlling slag according to the content of molten steel.
Preferably, when the acid-soluble aluminum content of molten steel is 0.010-0.020%, lime is adopted to control the basicity of slag for 3.0-4.0.
Preferably, when the acid-soluble aluminum content of molten steel is 0.025-0.045%, lime is adopted to control the basicity of slag for 4.0-5.0.
Refining slag reclaims and again utilizes in refining furnace slagging process by the present invention, refining slag making cost can be reduced, the remaining steel of casting and heat of slags can also be reclaimed, emissions reduction simultaneously, raising enterprise slag circulation comprehensive recycling level is of great practical significance.
Embodiment
Below in conjunction with example, the present invention is described in further detail, and it is only used as unrestricted for explanation of the present invention.
Embodiment 1:
In converter tapping process, with the amount of 1.5kg/t steel, aluminium manganese-titanium is added molten steel, concrete add-on carries out Dynamic controlling according to converter terminal carbon, thus the Als content of molten steel controls at 0.010%-0.020% the most at last.The hot slag of LF stove of casting complete by continuous caster after putting steel adds in ladle with the amount of 6.5kg/t steel.
In furnaceman's LF sequence, lime is added according to the amount of 2.5kg/t steel before electrified regulation, then the temperature raising slag that is energized is started, be energized and add silicon carbide reductor 0.5kg/t steel afterwards in 1 minute, after being energized 2 minutes, the carbide of calcium of 0.5Kg/t steel is added in LF stove, after being energized 4 minutes, the carbide of calcium of 0.5Kg/t steel is added in LF stove, after being energized 6 minutes, the carbide of calcium of 0.5Kg/t steel is added in LF stove, ensure refining slag (FeO+MnO) %≤0.5%, lime 0.5kg/t steel is added after taking the first sample, the basicity of refining slag is controlled for 3.0-4.0 with this, and the viscosity of slag is adjusted with this.
Due to the direct recycling slag making of the hot slag of LF stove refining of employing, saving the change slag stage of furnaceman's LF sequence, greatly reduce production cost, is 30% of traditional slagging process.
Embodiment 2:
In converter tapping process, with the amount of 2kg/t steel, aluminium manganese-titanium is added molten steel, concrete add-on carries out Dynamic controlling according to converter terminal carbon, thus the Als content of molten steel controls at 0.015%-0.025% the most at last.The hot slag of LF stove of casting complete by continuous caster after putting steel adds in ladle with the amount of 7.5kg/t steel.
In furnaceman's LF sequence, lime is added according to the amount of 3.0kg/t steel before electrified regulation, then the temperature raising slag that is energized is started, be energized and add silicon carbide reductor 0.5kg/t steel afterwards in 1 minute, after being energized 2 minutes, the carbide of calcium of 1Kg/t steel is added in LF stove, after being energized 4 minutes, the carbide of calcium of 0.5Kg/t steel is added in LF stove, after being energized 6 minutes, the carbide of calcium of 0.5Kg/t steel is added in LF stove, ensure refining slag (FeO+MnO) %≤0.5%, lime 0.5kg/t steel is added after taking the first sample, the basicity of refining slag is controlled for 3.5-4.5 with this, and the viscosity of slag is adjusted with this.
Claims (7)
1. a control method for LF furnace refining slag system, comprising:
In the process of ladle, add to molten steel the aluminium matter pre-deoxidant being enough to remove by the free oxygen in molten steel at least 99% before tapping or in tapping.
2. method according to claim 1, is characterized in that, the method also comprises: before entering LF stove, adds the hot refining slag that the casting of 6.5-7.5kg/t steel amount is complete in ladle.
3. method according to claim 1 and 2, is characterized in that, the method also comprises: when LF refining furnace, adds 2.5-3.0kg/t steel amount lime, add the fluorite of 0.5-1kg/t steel amount in LF refining furnace in LF refining furnace.
4. method according to claim 1 and 2, is characterized in that, the method also comprises: described method comprises further: the Al controlling the slag in ladle refining furnace
2o
3weight percent is 15%-20%.
5. method according to claim 1 and 2, is characterized in that, the method also comprises: adopt the FeO weight content of the slag in carbide of calcium and/or silicon carbide control ladle refining furnace and MnO weight content sum to be no more than 0.5%.
6. method according to claim 1 and 2, is characterized in that, the method also comprises: when the acid-soluble aluminum content of molten steel is 0.010-0.020%, adopts lime to control the basicity of slag for 3.0-4.0.
7. method according to claim 1 and 2, is characterized in that, the method also comprises: when the acid-soluble aluminum content of molten steel is 0.025-0.045%, adopts lime to control the basicity of slag for 4.0-5.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510646073.2A CN105154626A (en) | 2015-10-08 | 2015-10-08 | Method for controlling ladle furnace (LF) refining slag system |
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| CN201510646073.2A CN105154626A (en) | 2015-10-08 | 2015-10-08 | Method for controlling ladle furnace (LF) refining slag system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755734A (en) * | 2016-12-14 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of deoxidation slagging method of LF refining furnace |
| CN108018402A (en) * | 2018-01-13 | 2018-05-11 | 山东钢铁股份有限公司 | A kind of low cost wash heat method |
Citations (5)
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|---|---|---|---|---|
| CN101020940A (en) * | 2007-03-28 | 2007-08-22 | 北京科技大学 | Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel |
| CN102321785A (en) * | 2011-09-21 | 2012-01-18 | 首钢总公司 | Method for smelting high-silicon low-oxygen clean steel |
| CN102373316A (en) * | 2011-10-09 | 2012-03-14 | 莱芜钢铁集团有限公司 | Control method of slag system of ladle refining furnace |
| CN102676743A (en) * | 2012-05-23 | 2012-09-19 | 莱芜钢铁集团有限公司 | Step-by-step returning recycling method of LF (Lactoferrin) refining slag in thermal state |
| CN103572001A (en) * | 2013-11-01 | 2014-02-12 | 南京钢铁股份有限公司 | Method for controlling alkalinity of ultra-low-sulfur steel LF (ladle furnace) slag |
-
2015
- 2015-10-08 CN CN201510646073.2A patent/CN105154626A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020940A (en) * | 2007-03-28 | 2007-08-22 | 北京科技大学 | Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel |
| CN102321785A (en) * | 2011-09-21 | 2012-01-18 | 首钢总公司 | Method for smelting high-silicon low-oxygen clean steel |
| CN102373316A (en) * | 2011-10-09 | 2012-03-14 | 莱芜钢铁集团有限公司 | Control method of slag system of ladle refining furnace |
| CN102676743A (en) * | 2012-05-23 | 2012-09-19 | 莱芜钢铁集团有限公司 | Step-by-step returning recycling method of LF (Lactoferrin) refining slag in thermal state |
| CN103572001A (en) * | 2013-11-01 | 2014-02-12 | 南京钢铁股份有限公司 | Method for controlling alkalinity of ultra-low-sulfur steel LF (ladle furnace) slag |
Non-Patent Citations (1)
| Title |
|---|
| 武汉市科学技术协会: "《科技创新与国家中心城市建设——武汉市第五届科学年会论文集》", 31 October 2012 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755734A (en) * | 2016-12-14 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of deoxidation slagging method of LF refining furnace |
| CN106755734B (en) * | 2016-12-14 | 2018-08-14 | 山东钢铁股份有限公司 | A kind of deoxidation slagging method of LF refining furnace |
| CN108018402A (en) * | 2018-01-13 | 2018-05-11 | 山东钢铁股份有限公司 | A kind of low cost wash heat method |
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