CN101879591B - Method for improving service life of ladle slag line lining bricks - Google Patents
Method for improving service life of ladle slag line lining bricks Download PDFInfo
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- CN101879591B CN101879591B CN2009100114266A CN200910011426A CN101879591B CN 101879591 B CN101879591 B CN 101879591B CN 2009100114266 A CN2009100114266 A CN 2009100114266A CN 200910011426 A CN200910011426 A CN 200910011426A CN 101879591 B CN101879591 B CN 101879591B
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Abstract
The invention relates to a method for improving the service life of ladle slag line lining bricks. In the method, the chemical properties of slag is controlled and modified by adding MgO into the slag by stage. In a refining process, MgO, which accounts for 50 to 63 percent of the total amount, is added into the slag to control the MgO content of the slag to approach a saturated concentration; and after static argon blowing, MgO, which accounts for 40 to 46 percent of the total amount, is added into the slag to control the MgO content of the final slag to be greater than a saturated concentration, so the amount of the MgO fused into slag from slag line MgO-C lining bricks is reduced. The destruction speed of the slag line lining bricks is reduced by 60 percent, so the corrosion loss of the slag line lining bricks is relieved greatly, the service life of the slag line lining bricks is prolonged, the consumption of refractory materials is reduced, the replacement and repair workloads are reduced, and the using efficiency of the ladle is improved. The process is simple and easy to implement, the operation is convenient and reliable, the control is accurate and effective, and on extra equipment is used.
Description
Technical field
The invention belongs to steel-making and use fire resisting material field, be specifically related to a kind of through in LF stove ladle slag, adding MgO, thereby the method in raising ladle slag line lining bricks service life.
Background technology
At present, what domestic steel-making tandem rolling factory generally adopted is LF stove refined molten steel, and mostly the refractory material of slag line liner is MgO-C matter lining brick; Owing to receive slag character, the especially influence of finishing slag acid-base value, cause slag serious to the erosion of slag line lining brick; Therefore reduced the service life of MgO-C matter lining brick greatly, not only increased the consumption of refractory material, improved smelting cost; And directly influenced the service efficiency of ladle, increased the workload of changing and repairing.
Summary of the invention
The object of the invention is exactly to above-mentioned defective, provides a kind of cost lower, and operating procedure is simple, is easy to grasp and control, can effectively reduce the erosion of slag to refractory lining, thereby improves the ladle slag line lining bricks method in service life.
For this reason, the technical solution that the present invention taked is:
A kind of ladle slag line lining bricks method in service life that improves is characterized in that, through in slag, adding MgO stage by stage; The chemical property of control slag; Make that MgO concentration raises stage by stage in the slag, adjustment slag acid-base value reduces the etch degree of slag to the slag line lining brick; Concrete grammar is:
In refining process, the MgO content of slag is controlled near its saturated concentration, have good mobility to guarantee slag, thereby obtain good refining effect;
After the quiet Argon of beginning, again the MgO content in the finishing slag is controlled at it more than saturated concentration, make finishing slag be in liquid-solid state, MgO fuses into the quantity in the slag in the slag line MgO-C matter lining brick to reduce, and improves the service life of slag line lining brick.
Concrete interpolation process and quantity are: in the refining process, in slag, add the MgO that accounts for total adding weight 50～63%; After the quiet Argon of beginning, in slag, add the MgO that accounts for total adding weight 40～46% again.
The preferential MgO that recommends of the present invention is a light dolomite.
For the 260t ladle, in slag, add light dolomite 180～220kg. in the refining process; In slag, add light dolomite 140～160kg. after the quiet Argon again.
It is a most important measure that reduces refractory consumption rate that slag is carried out chemical property control.In alkaline steelmaking process; Employed refractory material mainly is MgO; Next is CaO; So the deteriorating of the refractory lining that is caused by slag corrosion depended on the fusion limit of MgO and CaO in the slag, the degree if MgO and CaO have reached capacity in slag, slag just can not fuse MgO or the CaO in the MgO-CaO matter liner in the refractory lining more so.Therefore, the degree of deteriorating of refractory lining also must descend.The present invention just is being based on this design and is proposing.Yet in the actual smelting process, in the slag that uses MgO-C matter lining brick, add a large amount of MgO and will directly change slag character, influence the flowability and final refining effect of slag.The present invention takes the method for adding stage by stage and controlling, and has both guaranteed refining effect, has controlled the character of slag again; Make that MgO content raises stage by stage in the slag, reduced fusing speed and the fusion degree of slag, can make the damage speed of slag line lining brick reduce by 60% MgO in the slag line; Thereby greatly reduced deteriorating of slag line lining brick; Improve the service life of slag line lining brick, reduced refractory consumption rate and cost expenditure, reduced the workload of changing and repairing; Improve workman's operating condition, improved the service efficiency of ladle.This method is simple for process, convenient and reliable operation, and precise control is effective, need not increase any equipment, and need not change normal production process and just can reach the control effect.
The specific embodiment
Below in conjunction with embodiment, the present invention is further specified.
Overall plan of the present invention is: through in slag, adding MgO stage by stage, the chemical property of control slag.In the refining process, in slag, add the MgO account for total adding weight 50～63%, the MgO content of slag in the refining process is controlled near its saturated concentration.So-called saturated concentration is meant that the amount of MgO solute in the slag reaches to greatest extent, and slag can not dissolve MgO again.Thereby make slag have good mobility, to guarantee to obtain good refining effect.After the quiet Argon; In slag, add the MgO that accounts for total adding weight 40～46% again, the MgO content in the finishing slag is controlled at it more than saturated concentration, the acid-base value of control slag; Make finishing slag be in liquid-solid state; MgO fuses into the quantity in the slag in the slag line MgO-C matter lining brick to reduce, and reduces the erosion degree of slag to the slag line lining brick, improves the service life of slag line lining brick.
Embodiment 1:
With LF stove 260t ladle is example.The total addition of various deoxidiers, desulfurizing agent and the slag former etc. that add in the smelting process is about 350kg.Therefore, in refining process, can in slag, add light dolomite 180kg.; After treating quiet Argon, in slag, add light dolomite 160kg. again.
Embodiment 2:
LF stove 260t ladle adds total addition such as various deoxidiers, desulfurizing agent and slag former altogether and is about 350kg in smelting process.In refining process, in slag, add light dolomite 210kg.; In slag, adding light dolomite 140kg. after the quiet Argon again gets final product.
Claims (2)
1. one kind is improved the ladle slag line lining bricks method in service life, it is characterized in that, through in slag, adding MgO stage by stage; The chemical property of control slag; Make that MgO concentration raises stage by stage in the slag, adjustment slag acid-base value reduces the erosion degree of slag to the slag line lining brick; Concrete grammar is:
In refining process, in slag, add the MgO account for total adding weight 50～63%, the MgO content of slag is controlled near its saturated concentration, have good mobility to guarantee slag, thereby obtain good refining effect;
After the quiet Argon of beginning; In slag, add the MgO that accounts for total adding weight 40～46% again, the MgO content in the finishing slag is controlled at it more than saturated concentration, make finishing slag be in liquid-solid state; MgO fuses into the quantity in the slag in the slag line MgO-C matter lining brick to reduce, and improves the service life of slag line lining brick.
2. the method in raising ladle slag line lining bricks according to claim 1 service life is characterized in that, for the 260t ladle, in slag, adds light dolomite 180～220kg in the refining process; In slag, add light dolomite 140～160kg after the quiet Argon again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100114266A CN101879591B (en) | 2009-05-07 | 2009-05-07 | Method for improving service life of ladle slag line lining bricks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100114266A CN101879591B (en) | 2009-05-07 | 2009-05-07 | Method for improving service life of ladle slag line lining bricks |
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| Publication Number | Publication Date |
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| CN101879591A CN101879591A (en) | 2010-11-10 |
| CN101879591B true CN101879591B (en) | 2012-04-04 |
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| CN2009100114266A Active CN101879591B (en) | 2009-05-07 | 2009-05-07 | Method for improving service life of ladle slag line lining bricks |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446529B (en) * | 2014-10-27 | 2016-07-13 | 朱小英 | A kind of ladle slag line refractory brick |
| CN107841594A (en) * | 2017-10-12 | 2018-03-27 | 河钢股份有限公司承德分公司 | A kind of method of refining for reducing ladle liner and corroding |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280365A (en) * | 2008-05-28 | 2008-10-08 | 北京科技大学 | Slag splashing method for nickel-copper smelting converter |
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2009
- 2009-05-07 CN CN2009100114266A patent/CN101879591B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280365A (en) * | 2008-05-28 | 2008-10-08 | 北京科技大学 | Slag splashing method for nickel-copper smelting converter |
Non-Patent Citations (3)
| Title |
|---|
| 吴兆学.转炉高温快补料的研究与应用.《山东金属学会2005炼钢学术交流会论文集》.2005,211-213. * |
| 李新士.转炉自流补炉料的研制.《河北冶金》.2006,93-94. * |
| 肖卫军.帘线钢钢包渣线砖侵蚀分析和提高寿命的工艺措施.《特殊钢》.2007,第28卷(第1期),55-56. * |
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| CN101879591A (en) | 2010-11-10 |
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