CN1320130C - Liquid steel out furnace refiner - Google Patents
Liquid steel out furnace refiner Download PDFInfo
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- CN1320130C CN1320130C CNB2004101030903A CN200410103090A CN1320130C CN 1320130 C CN1320130 C CN 1320130C CN B2004101030903 A CNB2004101030903 A CN B2004101030903A CN 200410103090 A CN200410103090 A CN 200410103090A CN 1320130 C CN1320130 C CN 1320130C
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- refiner
- liquid steel
- steel
- cao
- furnace outer
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Abstract
The present invention relates to a liquid steel furnace outer refiner for desulfurizing, dephosphorizing and preventing phosphate return, which belongs to the smelting field of steel. The liquid steel furnace outer refiner is composed of BaCO3, BaF2, Al2O3 and CaO; the refiner is formed by proportioning, uniformly mixing and drying at normal temperature under normal pressure according to components, contents and granularity, or the refiner is formed by proportioning, uniformly mixing and pre-melting under the normal pressure according to the components, the contents and the granularity. Compared with the prior art, the liquid steel furnace outer refiner has the advantages that the refiner simultaneously solves the problems of desulphurization and dephosphorization for refining furnace outer liquid steel and importantly solves the problem of the phosphate return after the reduction of the slag of a ladle, and the corrosion of a steel-smelting covering line is lightened. The liquid steel furnace outer refiner is good for enhancing the quality of products and the hit ratio of steel-smelting production, and the liquid steel furnace outer refiner creates a condition for smelting the new species of the low-sulfur and low-phosphate steel.
Description
Technical field
The invention belongs to the field of smelting of steel, the desulfurization that relates in particular to molten steel furnace external refining, dephosphorization, prevent the refining agent that rephosphorization is used.
Background technology
Sulphur, phosphorus produce segregation at the crystal boundary of steel easily, seriously reduce steel drift and hit toughness, weldability, cracking resistance line, anti-pleat in the steel.Particularly high-quality steel grades such as Cryogenic Steel, marine steel, anti-hydrogen induced cracking steel, high-ductility steel are stricter to the content requirement of the sulphur in the steel, phosphorus.The molten steel of smelting carries out external refining, reduces sulphur, phosphorus content in the steel, for the quality product that improves steel, enlarge range of product, reducing production costs has crucial meaning.The existing general CaO-Al that adopts
2O
3Be that molten steel furnace external refining sweetening agent, CaO-FeO are the molten steel furnace external refining dephosphorizing agent, the defective of existence is: the former can desulfurization, but dephosphorization effect is poor; Latter's energy dephosphorization, but desulfurization is relatively poor, and after the molten steel furnace external refining ladle slag was made reducing slag, CaO-FeO was a dephosphorizing agent complete failure, the serious rephosphorization of molten steel.Therefore, having occurred recently at CaO-FeO is to replace CaO with part BaO on the dephosphorizing agent basis, and the rephosphorization phenomenon alleviates to some extent, but the rephosphorization problem still is not resolved.Thereby causing the unstable properties of steel, hit rate is low, has increased production cost; Limited the kind of steel, refining ladle corroded, severe contamination molten steel.
Summary of the invention
In order to overcome the shortcomings and deficiencies that prior art exists, the purpose of this invention is to provide a kind of refining agent, can in refining process, make reducing slag before, molten steel is carried out dephosphorization; In the refining process after making reducing slag, molten steel is carried out desulfurization, and not rephosphorization of molten steel.
The present invention has changed that to adopt CaO for a long time be the refining agent of base, and adopting BaO be basic refining agent, and each compositions in weight percentage is by BaCO
330-60%, BaF
28-11%, Al
2O
317-23%, CaO38-13% form, and at normal temperatures and pressures, prepare burden by component and content, granularity, adopt general method uniform mixing, granulation (or not granulation), drying to form; Or carry out mixing, fritting sintering, fragmentation after the batching and form.
Refining agent of the present invention and CaO are that refining agent is in desulfurization, dephosphorization mechanism and effect narration.
1, in the refining process before ladle slag is made reducing slag, dephosphorisation reaction takes place under oxidizing atmosphere:
Its dephosphorizing capacity is a dephosphorizing agent apparently higher than CaO.
2, in the refining process after ladle slag is made reducing slag, desulphurization reaction takes place,
(3BaOP with the first oxide compound that produces of dephosphorisation reaction
2O
5Deng) back dissolves in slag, different is, and desulphurization reaction is on slag-metal interface with the replacement(metathesis)reaction of transfer transport,
Because the ion position (ionic valence/ionic radius) of BaO is 1.48, the ion position 1.89 of CaO, and the metallic cation of metal oxide is directly proportional with the ion position with the negatively charged ion bonding force, so BaO is than the easier O that emits of CaO
2-, favourable to desulfurization.Because the optical basicity of BaO slag system is 1.15, and CaO is 1.0, the former sulfur capacity is big, so the sweetening power of BaO is higher than CaO slag system sweetening agent.
3, when molten steel is made reducing slag in the external refining process after, (∑ FeO+MnO) generally reduces to 0.5～1.5% in the ladle slag, and the dividing potential drop of its oxygen is corresponding to drop to 10
-12.2～10
-11.2Atm, and CaO dephosphorisation reaction
ΔG°＝-1966388+562·TT
Because above-mentioned Δ G ° is at standard state (P
O2During the numerical value of=/atm), other factor is constant in reaction system, and when an aerobic gesture obviously reduced, the free energy change of CaO dephosphorization was as follows
ΔG°＝-1966388+(562.7-47.851gP
o2)T
Can derive the threshold value P of CaO dephosphorization and rephosphorization oxygen partial pressure according to following formula
O2=10
-10.4Atm.Therefore, CaO is that refining agent rephosphorization after ladle slag is reduced is serious.
The BaO dephosphorisation reaction:
Other factor is constant in the reaction formula system, and when an aerobic gesture obviously reduced, the free energy change of BaO dephosphorization was as follows:
ΔG°＝-2199500+(595.15-47.851gP
o2)T
Can derive the threshold value P of BaO dephosphorization and rephosphorization oxygen partial pressure according to following formula
O2=10
-12.3Atm.Therefore, BaO be refining agent after ladle slag is reduced, still not rephosphorization.
Molten steel furnace external refining adds at twice by the common refining agent method that adds.
Compared with prior art, advantage of the present invention is, with a kind of refining agent the external refining molten steel is carried out desulfurization, dephosphorization, what is more important has solved ladle and has made the serious rephosphorization problem of molten steel behind the reducing slag, help the hit rate of improving the quality of products and making steel, for the new variety of smelting low-sulfur, low phosphoretic steel have been created condition.
Embodiment
Further specify the present invention below by embodiment.
In following examples and contrast, represent sweetening effectiveness with desulfurization degree, represent dephosphorization effect with dephosphorization rate, numerical value is big more, and effect is good more.
Embodiment is at normal temperatures and pressures, prepares burden by component and content, granularity, adopts general method uniform mixing, granulation (or not granulation), drying to form; Or carry out mixing, fritting sintering, fragmentation after the batching and form.
Embodiment 1:BaCO
332-40%, BaF
28-11%, Al
2O
317-23%, CaO 28-38%,
Dephosphorization rate: 30-45% desulfurization degree: 40-75%.
Embodiment 2:BaCO
342-48%, BaF
28-11%, Al
2O
317-23%, CaO 20-28%,
Dephosphorization rate: 45-60% desulfurization degree: 40-75%.
Embodiment 3:BaCO
348-56%, BaF
28-11%, Al
2O
317-23%, CaO 13-20%
Dephosphorization rate: 60-80% desulfurization degree: 40-75%.
Claims (4)
1, the liquid steel out furnace refiner design is a base with BaO, and each compositions in weight percentage is by BaCO
330-60%, BaF
28-11%, Al
2O
317-23%, CaO 38-13% form; At normal temperatures and pressures, prepare burden, adopt general method to mix by component concentration, granularity, granulation or not granulation, drying forms; Or carry out mixing, fritting sintering, fragmentation after the batching and form.
2, liquid steel out furnace refiner according to claim 1, its chemical ingredients is by BaCO
332-40%, BaF
28-11%, Al
2O
317-23%, CaO 28-38% form, and more than are by weight percentage.
3, liquid steel out furnace refiner according to claim 1, its chemical ingredients is by BaCO
342-48%, BaF
28-11%, Al
2O
317-23%, CaO 20-28% form, and more than are by weight percentage.
4, liquid steel out furnace refiner according to claim 1, its chemical ingredients is by BaCO
348-56%, BaF
28-11%, Al
2O
317-23%, CaO 13-20% form, and more than are by weight percentage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101030903A CN1320130C (en) | 2004-12-31 | 2004-12-31 | Liquid steel out furnace refiner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101030903A CN1320130C (en) | 2004-12-31 | 2004-12-31 | Liquid steel out furnace refiner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1800419A CN1800419A (en) | 2006-07-12 |
| CN1320130C true CN1320130C (en) | 2007-06-06 |
Family
ID=36810628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004101030903A Expired - Fee Related CN1320130C (en) | 2004-12-31 | 2004-12-31 | Liquid steel out furnace refiner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1320130C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453659C (en) * | 2006-12-21 | 2009-01-21 | 马鞍山中冶钢铁冶金高新技术有限公司 | Desulfurizing and dephosphoring refining agent for external refining of molten steel |
| CN103642980A (en) * | 2013-12-10 | 2014-03-19 | 广西博士海意信息科技有限公司 | Refining agent for steel-making |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066887A (en) * | 1992-03-21 | 1992-12-09 | 呼和浩特市科学技术情报研究所 | Dephosphorization in cupola |
| CN1425780A (en) * | 2003-01-20 | 2003-06-25 | 北京科技大学 | Refining desulfurizing dreg system and desulfurizing process for producing extremely low sulfur steel |
| CN1142297C (en) * | 2001-09-11 | 2004-03-17 | 重庆工业高等专科学校 | Composite molten steel refining additive |
| CN1151286C (en) * | 2001-07-05 | 2004-05-26 | 北京科技大学 | Technology for producing ultralow-sulfur steel with steel ladle as refining furnace |
-
2004
- 2004-12-31 CN CNB2004101030903A patent/CN1320130C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066887A (en) * | 1992-03-21 | 1992-12-09 | 呼和浩特市科学技术情报研究所 | Dephosphorization in cupola |
| CN1151286C (en) * | 2001-07-05 | 2004-05-26 | 北京科技大学 | Technology for producing ultralow-sulfur steel with steel ladle as refining furnace |
| CN1142297C (en) * | 2001-09-11 | 2004-03-17 | 重庆工业高等专科学校 | Composite molten steel refining additive |
| CN1425780A (en) * | 2003-01-20 | 2003-06-25 | 北京科技大学 | Refining desulfurizing dreg system and desulfurizing process for producing extremely low sulfur steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1800419A (en) | 2006-07-12 |
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Granted publication date: 20070606 Termination date: 20131231 |