CN101892342B - Slagging method for converter - Google Patents
Slagging method for converter Download PDFInfo
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- CN101892342B CN101892342B CN2010102362032A CN201010236203A CN101892342B CN 101892342 B CN101892342 B CN 101892342B CN 2010102362032 A CN2010102362032 A CN 2010102362032A CN 201010236203 A CN201010236203 A CN 201010236203A CN 101892342 B CN101892342 B CN 101892342B
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- slag
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Abstract
The invention belongs to a slagging method for a converter. The method comprises the following step of: adding composite slag into the converter after finishing charging and starting blowing for 3 to 3.5 minutes. Due to the addition of the composition slag at the beginning of prophase foamed slag, the splashing of the prophase foamed slag can be effectively controlled; simultaneously, the melting point of slag can be reduced because of the aluminum oxide of the composite slag; the drying time of a metaphase and the drying time of an anaphase are reduced; slag adhesion is reduced; and a slagging effect is improved. Because a process slagging effect is improved, P and S removing effects at an end point are enhanced and an effect of splashing slag for protecting the converter is improved.
Description
Technical field
The present invention relates to a kind of slagging method of converter.
Background technology
At present, control converter foamy slag in early stage, most steel mills adopt special-purpose pressure spray, perhaps change the mode of operations to control the foamy slag in early stage.The steel mill that converter intermediary and later stages slag has adopts dissolving agents such as fluorite, pelletizing, iron scale, and the steel mill that has adopts special-purpose dissolving agent, controls the time of doing of returning.Shortcoming is: 1, the control method of converter smelting foamy slag in early stage is single, and effect is bad, and splash easily makes that early stage, foamy slag was taken away the part ferric charge, influences the iron and steel recovery; 2, it is longer that the smelting process converter slag returns the time of doing, and dissolving agent slag effects such as pelletizing, iron scale are bad, can cause the steel bonding of oxygen rifle like misoperation, influence the production direct motion.
Summary of the invention
In order to overcome the shortcoming of prior art, the present invention provides a kind of slagging method of converter, and it is effective that it changes slag, and it is short to return the time of doing.
The present invention solves the technical scheme that its technical problem takes: accomplish to open in the converter charging and add composite slag when blowing 3～3.5 minutes.
The add-on of said composite slag is: the 4-5kg/t steel.
Said composite slag composition is: Al
3O
2-44%, Al-13%, CaO-17%, SiO
2-15%, C-10.9%, P-0.05%, S-0.05%.
Advantage of the present invention: 1, can effectively control foamy slag splash in early stage at foamy slag in early stage time-out adding just composite slag; Because the aluminium sesquioxide in the composite slag can reduce slag melting, reduce the intermediary and later stages and returned the time of doing simultaneously, reduced sticking rifle; Improvementization slag effect; Owing to improved process slag effect, increase terminal point and gone P, S effect, improved the slag splashing effect; Change slag operation when 2, helping high catch carbon and slag steel and pack less smelt into, the slag specimen pore is few, and abrasive grit is mingled with few, reduces finishing slag FeO.
Embodiment
The use of composite slag: the joining day of composite slag influences its result of use; Joining day: the converter charging is accomplished to open when blowing 3～3.5 minutes and is added; This moment converter initial stage foamy slag from the beginning of, the AL in the composite slag sloughs " 0 " in the foamy slag, effectively suppresses the splash of foamy slag.Add-on: 4kg/t steel.Composite slag composition Al
3O
2-44%, Al-13%, CaO-17%, SiO
2-15%, C-10.9%, P-0.05%, S-0.05%.
Can effectively control foamy slag splash in early stage at foamy slag in early stage time-out adding just composite slag,, reduce the intermediary and later stages and returned the time of doing simultaneously because the aluminium sesquioxide in the composite slag can reduce slag melting; Reduce sticking rifle; Improvementization slag effect owing to improved process slag effect, has increased terminal point and has gone P, S effect; Improved the slag splashing effect, concrete data are seen table one.
Change slag operation when helping high catch carbon and slag steel and packing less smelt into is got the slag specimen that adds the composite slag heat and is observed, and the slag specimen pore is few, and abrasive grit is mingled with few, reduces finishing slag FeO, concrete data such as table two.
Table one: endpoint molten steel composition correlation data:
Under the basic identical situation of Intake Quantity, the average end point carbon of pressurization spray dissolving agent heat is higher by 0.0111% than the average carbon of heat of the spray dissolving agent that do not pressurize, and average Mn is low by 0.01%, and mean P is low by 0.005%, average S low 0.002%.
Get slag specimen 17 heats altogether
Molten iron silicon base is originally identical; Under the also essentially identical situation of lime add-on; It is on average lower by 1.6% than the heat finishing slag feo of the spray dissolving agent that do not pressurize to add the heat of pressing the spray dissolving agent, on average adds 309.09kg at every stove and presses under the situation of spray dissolving agent, and pelletizing on average adds 246kg less.
Change slag effect in composite slag foamy slag in compacting early stage and the converting process is better, and the change slag operation when helping high catch carbon and slag steel and packing less the smelting into is for slag steel Intake Quantity heat greatly, DeGrain.The heat finishing slag bubble that adds composite slag is less, and it is less to be mingled with abrasive grit, shows that through above chart contrast iron and steel stock consumption is also low slightly, terminal point P is also low slightly, finishing slag feo reduces by 1.6% in addition.
Claims (1)
1. the slagging method of a converter is characterized in that: accomplish to open in the converter charging and add composite slag when blowing 3～3.5 minutes; Said composite slag composition is: Al
3O
2-44%, Al-13%, CaO-17%, SiO
2-15%, C-10.9%, P-0.05%, S-0.05%; The add-on of said composite slag is: the 4-5kg/t steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102362032A CN101892342B (en) | 2010-07-22 | 2010-07-22 | Slagging method for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102362032A CN101892342B (en) | 2010-07-22 | 2010-07-22 | Slagging method for converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101892342A CN101892342A (en) | 2010-11-24 |
| CN101892342B true CN101892342B (en) | 2012-04-25 |
Family
ID=43101687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102362032A Active CN101892342B (en) | 2010-07-22 | 2010-07-22 | Slagging method for converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101892342B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032065A (en) * | 2014-05-10 | 2014-09-10 | 长兴三重窑炉科技有限公司 | Steelmaking composite slag |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51121424A (en) * | 1975-04-18 | 1976-10-23 | Daiken Kako Kk | Process for the production of a composite slag-forming agent |
| JPS591610A (en) * | 1982-05-28 | 1984-01-07 | Shinagawa Rozai Kk | Composite slag forming agent for basic steel making furnace |
| CN101736114B (en) * | 2008-11-19 | 2011-11-09 | 攀钢集团研究院有限公司 | Composition for slag formation and preparation and use method thereof |
| CN101701278A (en) * | 2009-11-17 | 2010-05-05 | 永仁县隆丰工贸有限责任公司 | Composite slag former |
-
2010
- 2010-07-22 CN CN2010102362032A patent/CN101892342B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101892342A (en) | 2010-11-24 |
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