CN102828001A - Slagging method for steel ladle refining furnace - Google Patents
Slagging method for steel ladle refining furnace Download PDFInfo
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- CN102828001A CN102828001A CN2012103576841A CN201210357684A CN102828001A CN 102828001 A CN102828001 A CN 102828001A CN 2012103576841 A CN2012103576841 A CN 2012103576841A CN 201210357684 A CN201210357684 A CN 201210357684A CN 102828001 A CN102828001 A CN 102828001A
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- Prior art keywords
- slag
- light
- steel
- lime
- burned dolomite
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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
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a slagging method for a steel ladle refining furnace, comprising the following steps of: for anharmonic silicon aluminum killed steel of which the finished product sulphur upper limit is larger than or equal to 0.010wt% and silicon killed steel of which the finished product sulphur upper limit is larger than or equal to 0.008wt%, adding lime, light-burned dolomite and fluorite into a first batch of slag charges added into an LF (low frequency) furnace according to the proportion of 3:3:1; slagging in a heating way, and adding the lime and the light-burned dolomite into a second batch of slag charges according to the proportion of 1:1; and in the total slag charge, controlling the light-burned dolomite at 2.5-3kg/t of steel. Part lime is replaced by the light-burned dolomite, so that the flux cost of the LF furnace can be greatly reduced. Meanwhile, the MgO in the light-burned dolomite can protect a lining of a molten steel jar, the MgO content in the LF slag can reach more than 9%, and the service life of a slag line of the molten steel jar can reach more than 50 times, so that the service life of the lining of the molten steel jar can be greatly prolonged.
Description
Technical field
The invention belongs to the process for making technical field, relate in particular to a kind of ladle refining furnace (LF stove) slagging method of protecting molten steel jar jar lining.
Background technology
Hold in the process of molten steel at ladle, slag liquid or molten steel go out from this position leakage, are called the slag line accident of wearing.This kind accident is that ladle is worn the accident that often runs in the bag accident, and the generation ratio accounts for more than 50% of whole ladle leakage accident number of times.The molten steel of leakage threatens bigger to personnel safety, molten steel splashes and is prone to scald operator, causes personnel's injury accident.The molten steel of leakage tends to damage equipment, also can bring loss economically.In LF stove treating processes, the working conditions very severe of ladle slag line during the heating of LF stove, stand washing away of high-temperature molten steel.Also to stand the erosion of LF furnace roof slag in addition, be prone to cause the slag line accident of wearing.At present, preventing to wear the slag line accident mainly is to take to strengthen ladle to use preceding inspection, guarantee quality and anti-material amount that ladle is built by laying bricks or stones.But wearing the slag line accident still happens occasionally.
At present, domestic LF stove slag making mainly uses lime to carry out slag making, and the lime consumption accounts for more than 70% of LF stove flux amount.Because the lime price is higher, average price reaches 550 yuan/ton, has therefore improved the flux cost of LF stove slag making greatly, and the effect of protection molten steel jar lining is also not obvious.
Summary of the invention
The object of the invention aims to provide a kind of flux cost of the LF of reduction stove, and improves the molten steel jar jar lining ladle refining furnace slagging method in work-ing life.
For this reason, the solution that the present invention taked is:
A kind of slagging method of ladle refining furnace, to the non-low silicon aluminium killed steel of the finished product sulphur upper limit >=0.010wt% and the Si killed steel of the finished product sulphur upper limit >=0.008wt%, the concrete slagging method of taking is:
1, in first slag charge that the LF stove adds, lime, light dolomite, fluorite add according to the ratio of 3:3:1;
2, add second batch of slag charge behind the intensificationization slag, lime, light dolomite add according to the ratio of 1:1;
3, in total slag charge, light dolomite is controlled at the 2.5-3kg/t steel.
Beneficial effect of the present invention is:
1, since the present invention with light dolomite instead of part lime, the light dolomite price is 230 yuan/ton, and the lime price is 550 yuan/ton, price differential per ton is 320 yuan, therefore can reduce the flux cost of LF stove greatly.
2, owing to contain MgO in the light dolomite; Can play a protective role to the jar lining of molten steel jar; MgO content had notable difference before and after the LF stove added light dolomite, and average MgO content can increase by 1.64%, and MgO content can reach more than 9% in the LF slag; The molten steel jar slag line life-span has reached more than 50 times, thereby greatly improves the work-ing life of molten steel jar jar lining.
Embodiment
Embodiment 1: adopt 250 tons of LF stoves, actual dress steel amount is 240 tons.The production steel grade is Q235B.
1, in first slag charge that the LF stove adds, lime is that 300kg, light dolomite are that 300kg, fluorite are 100kg.
2, add second batch of slag charge behind the intensificationization slag, wherein the add-on of lime and light dolomite is 300 kg.
Thereby guarantee that in total slag charge, the add-on of light dolomite is controlled at the 2.5kg/t steel.
Embodiment 2:
Adopt 250 tons of LF stoves, actual dress steel amount is 240 tons.The production steel grade is B.
1, in first slag charge that the LF stove adds, lime is that 390kg, light dolomite are that 390kg, fluorite are 130kg.
2, add second batch of slag charge behind the intensificationization slag, wherein the add-on of lime and light dolomite is 330 kg.
Thereby guarantee that in total slag charge, the add-on of light dolomite is controlled at the 3kg/t steel.
Claims (1)
1. the slagging method of a ladle refining furnace is characterized in that, to the non-low silicon aluminium killed steel of the finished product sulphur upper limit >=0.010wt% and the Si killed steel of the finished product sulphur upper limit >=0.008wt%, its concrete slagging method is:
(1), in first slag charge that the LF stove adds, lime, light dolomite, fluorite add according to the ratio of 3:3:1;
(2), add second batch of slag charge behind the intensificationization slag, lime, light dolomite add according to the ratio of 1:1;
(3), in total slag charge, light dolomite is controlled at the 2.5-3kg/t steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103576841A CN102828001A (en) | 2012-09-25 | 2012-09-25 | Slagging method for steel ladle refining furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103576841A CN102828001A (en) | 2012-09-25 | 2012-09-25 | Slagging method for steel ladle refining furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102828001A true CN102828001A (en) | 2012-12-19 |
Family
ID=47331308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103576841A Pending CN102828001A (en) | 2012-09-25 | 2012-09-25 | Slagging method for steel ladle refining furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102828001A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115216583A (en) * | 2022-07-14 | 2022-10-21 | 包头钢铁（集团）有限责任公司 | Method for improving corrosion resistance of slag line of magnesium-carbon refining ladle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139679A (en) * | 2007-10-17 | 2008-03-12 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by top and bottom combined blown converter |
| CN101586174A (en) * | 2009-06-16 | 2009-11-25 | 武汉钢铁(集团)公司 | Steel two-slag purifying method for ultra-cleaning welding |
-
2012
- 2012-09-25 CN CN2012103576841A patent/CN102828001A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139679A (en) * | 2007-10-17 | 2008-03-12 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by top and bottom combined blown converter |
| CN101586174A (en) * | 2009-06-16 | 2009-11-25 | 武汉钢铁(集团)公司 | Steel two-slag purifying method for ultra-cleaning welding |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115216583A (en) * | 2022-07-14 | 2022-10-21 | 包头钢铁（集团）有限责任公司 | Method for improving corrosion resistance of slag line of magnesium-carbon refining ladle |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121219 |