CN101545027A - Low-carbon quick melting ladle refining slag - Google Patents
Low-carbon quick melting ladle refining slag Download PDFInfo
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- CN101545027A CN101545027A CN200810035022A CN200810035022A CN101545027A CN 101545027 A CN101545027 A CN 101545027A CN 200810035022 A CN200810035022 A CN 200810035022A CN 200810035022 A CN200810035022 A CN 200810035022A CN 101545027 A CN101545027 A CN 101545027A
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- slag
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- steel
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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 low-carbon quick melting ladle refining slag, which comprises the following chemical components in percentage by weight: 55 to 68 percent of CaO, 3 to 8 percent of SiO2, 5 to 12 percent of Al2O3, 6 to 18 percent of CaF2, 2 to 5 percent of Ca-Si, 3 to 7 percent of Al, 2 to 5 percent of MgO, less than or equal to 0.2 percent of H2O, and less than or equal to 0.015 percent of C. Compared with the prior art, the invention has the advantages that the low-carbon quick melting ladle refining slag has the characteristics of quick slag formation and good slag-metal reaction, can fully play the advantages in deep deoxidization and desulfurization of molten steel in a refining process of a ladle refining furnace, effectively removes impurities in steel, solves the problem of acieration during the LF refining of ultra-low carbon steel, and is favorable for ladle refractory materials and environment.
Description
Technical field
The present invention relates to the ladle furnace refining technology of soft steel, belong to soft steel especially at ladle refining furnace purified ladle refining slag, this ladle refining slag has very low carbon content, can reduce of the carburetting of ladle refining process to molten steel, has low fusing point simultaneously, can make slag have good flowability in the quick slagging of ladle refining process.
Background technology
Ladle refining furnace (being LF) is the refining unit with heated by electrodes device, and its refining process has energising heating makes functions such as molten steel heating and slag making refining make steel liquid deoxidation, desulfurization, go to be mingled with, alloying.The LF refining process adopts heated by electrodes can cause molten steel recarburization, makes the carbon component of ultra low-carbon steel (the following carbon content of 50ppm) go beyond the scope.Molten steel recarburization that the molten steel recarburization that causes the reason of LF refining process molten steel recarburization that the melting loss of electrode in heat-processed, carbon that the molten steel alloying is brought into are arranged to cause, ladle refining slag etc. cause at refining process etc.The molten steel recarburization that ladle refining slag etc. cause at refining process is that the refining ultra-low-carbon steel process can not put up with sometimes up to 30ppm-50ppm.Therefore, the general Ultra-low carbon steel capital is without the LF refining treatment.If solved the carburetting problem of ultra low-carbon steel at the LF refining process, made more than the ultra low-carbon steel a kind of refining means undoubtedly, can also give full play to the advantage of LF refining process to molten steel desulfurizing.This realizes that to adopting electric furnace-VD vacuum decarburization-LF ladle refining technical process the production of this Ultra-low carbon of non orientating silicon steel, ultralow-sulfur steel is highly profitable.
At present, domestic and international development and application in present technique yet there are no report.With ladle slag and refining is that keyword has carried out domestic and international patent inquiry.Relevant domestic patent has 46, wherein 36 relate to the skim refinery practice of the high steel grade of carbon containings such as invention for apparatus such as device, heating ladle furnace, ladle lining coating, soaking tub and stainless steel, bearing steel, free-cutting steel of slag steel separation method, ladle, do not get in touch with the present invention; There are 10 patents to relate to the reduction and the upgrading of refining process ladle slag, but carbon content in the slag do not proposed control, the refining treatment that is applied to soft steel and middle and high carbon steel that has, the slag composition of employing and application method have obviously different with the present invention.The foreign patent retrieval has 15 relevant patents, and its slag basicity is controlled between the 1.5-1.8 about stainless steel refining aspect wherein three, and is obviously different with the present invention; Four is the refining treatment about high carbon steel, cord steel and unkilled steel water in addition, mainly is for inclusion modification and deoxidation of molten steel, with this patent tangible difference is arranged; Other has two about the desulfurizing iron processing, does not get in touch with the present invention; One is to add the method that ferroaluminium carries out desulfurization in ladle top slag, does not relate to the content of slag; One is to spray into pulvis molten steel is carried out the desulfurization processing in the RH vacuum degasser, has obviously different with present technique; One is about taking off slag operation at LF, and to the patent that slag carries out recycle, does not get in touch with present technique; A patent is the ladle slag that designs in order to protect LF refining furnace ladle slag line refractory materials, and is obviously different with the purpose of present technique; The patent No. is that the aluminium ash of Japanese Patent " ACTIVE SLAG-MAKING MATERIAL " by adding 5%-60% in CaO of JP2001040430 is to obtain the desulfurizing and refining process that active high refining slag system is used for molten steel, can realize quick slagging, but the claim that does not relate to other composition is not conflicted with present technique.The patent No. is the molten steel desulfurizing that the Korean Patent of KR2001037012 relates to short flow process steel mill, and its method is to adopt ladle argon-blown to promote CaO and Al at tapping process
2O
3Ratio is that the slag system of 1.5-1.7 melts evenly fast, reaches the purpose of desulfurization, does not relate to other composition of slag.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of ladle refining slag of low-carbon quick melting, and this ladle refining slag can reduce the carburetting of ladle refining process to molten steel, can realize effectively that the ladle refining process to molten steel deep deoxidation and desulfurization, can remove steel inclusion.
For solving the problems of the technologies described above, the ladle refining slag of a kind of low-carbon quick melting of the present invention, its chemical component weight per distribution ratio is: CaO:55～68wt%, SiO
2: 3～8wt%, Al
2O
3: 5～12wt%, CaF
2: 6～18wt%, Ca-Si:2～5wt%, Al:3～7wt%, MgO:2～5wt%, H
2O≤0.2wt%, C≤0.015wt%.
Described refining slag is a granular mixture.
The granularity of described refining slag is 3～15mm.
CaO: CaO is the main component of molten steel desulfurizing reaction in the pulvis, and the removal of sulphur is mainly by following reaction: CaO+[S in the steel]=CaS+[O]
Promptly remove by dissolved reaction of Salmon-Saxl in CaO component in pulvis or the slag charge and the steel.Therefore, must guarantee that its content reaches certain ratio.By above-mentioned reaction as seen, reaction is carried out to the liquid steel desulphurization direction, be needed to guarantee that the oxygen in the molten steel is reduced to certain degree, promptly the molten steel oxygen level is low more, is beneficial to the carrying out of desulphurization reaction more.
Al, Ca-Si: the ladle refining slag of low-carbon quick melting contains part metals aluminium and silicon, calcium alloy, guarantees that carrying out desulfurization under the situation of molten steel degree of depth deoxidation handles, and its deoxidation products also enters in the slag, and its deoxygenation is:
Al+[O]＝(Al
2O
3)
Si+[O]＝(SiO
2)
Ca(g)+[O]＝(CaO)
CaO-Al
2O
3, CaF
2: use CaO-Al
2O
3Be pre-melted slag and CaF
2Make fusing assistant, the flowability of slag is bigger to the desulphurization reaction influence of molten steel, and the slag of good fluidity can be strengthened the slag gold reaction, thereby promotes the carrying out of molten steel desulfurizing.Therefore, need quick slagging, the fusing point of slag and good fluidity can improve reaction efficiency.Add the constituent element of fluxing and can reach reduction slag fusing point, improve its mobile purpose in slag, make that the CaO in the slag is combined into liquid state with it, with molten steel generation liquid-liquid reactions, its dynamic conditions is better than the dynamic conditions of solid-liquid reaction again.Too high fusing assistant content can influence the desulfurization thermodynamics of slag, thereby reduces the sweetening power of slag, and low excessively fusing assistant content does not then reach quick slagging and improves the dynamic (dynamical) purpose of desulfurization by slag.
Granularity 3～15mm: the granularity of refining slag also is to guarantee the key factor of quick slagging of refining process and good reaction kinetics, and too greatly then reactivity worth is poor for particle size, and slagging is slow, the lack of homogeneity of slagging; Too small then the causing easily of particle dispersed and airborne dust.The size composition of this refining slag is 3-15mm.
MgO: allocate certain MgO constituent element in the slag into, can alleviate the erosion of slag, play the effect of protection ladle lining, and do not influence the metallurgical function of slag to ladle lining.
C: because the control of carbon is very strict in the Ultra-low carbon steel to steel, the carbon content in the slag has proposed control criterion mutually, guarantees the specification of quality of ultra low-carbon steel.
In addition, should reduce the moisture in the refining slag as far as possible, reduce influence steel quality.
Described granularity is a granular mixture.
The present invention compared with prior art, the beneficial effect that has is: this low-carbon quick melting ladle refining slag, have the characteristics of quick slagging and good slag gold reaction, can give full play to the advantage of ladle refining furnace refining process, effectively remove steel inclusion molten steel deep deoxidation and desulfurization.Solved the carburetting problem of ultra low-carbon steel at the LF refining process.Also favourable to ladle lining and environment.
Embodiment
Below will adopt the composition of the different instant ladle refining slag of low-carbon (LC) of 4 groups of chemical component weight per distribution ratios to make embodiment, and test, they are different forms and result of use is represented with the form of form 1:
Embodiment 1-4
Table 14 embodiment of the present invention
As can be seen from Table 1, ladle refining slag of the present invention is mainly by CaO, CaF
2, SiO
2, Al
2O
3, MgO, Ca-Si and Al form, and has very low carbon content, can reduce the carburetting of ladle refining process to molten steel, can make slag have good flowability in the quick slagging of ladle refining process.After the ladle refining processing, the sulphur in the molten steel, total oxygen and carbon content are well controlled, and have satisfied high-quality low-carbon steel purified needs.
Claims (3)
1. the ladle refining slag of a low-carbon quick melting is characterized in that the chemical component weight per distribution ratio is: CaO:55～68wt%, SiO
2: 3～8wt%, Al
2O
3: 5～12wt%, CaF
2: 6～18wt%, Ca-Si:2～5wt%, Al:3～7wt%, MgO:2～5wt%, H
2O≤0.2wt%, C≤0.015wt%.
2. the ladle refining slag of low-carbon quick melting as claimed in claim 1, it is characterized in that: described refining slag is a granular mixture.
3. the ladle refining slag of low-carbon quick melting as claimed in claim 1, it is characterized in that: the granularity of described refining slag is 3～15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810035022A CN101545027A (en) | 2008-03-24 | 2008-03-24 | Low-carbon quick melting ladle refining slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810035022A CN101545027A (en) | 2008-03-24 | 2008-03-24 | Low-carbon quick melting ladle refining slag |
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| Publication Number | Publication Date |
|---|---|
| CN101545027A true CN101545027A (en) | 2009-09-30 |
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ID=41192403
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|---|---|---|---|
| CN200810035022A Pending CN101545027A (en) | 2008-03-24 | 2008-03-24 | Low-carbon quick melting ladle refining slag |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382947A (en) * | 2011-11-29 | 2012-03-21 | 南京钢铁股份有限公司 | Low-basicity synthetic slag for external refining |
| CN102409140A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Refined slag used in steel-making process for bearing steel |
| CN102041355B (en) * | 2009-10-23 | 2012-12-12 | 宝山钢铁股份有限公司 | Ladle slag modifier for stainless steel refining process |
| US8523977B2 (en) | 2011-01-14 | 2013-09-03 | Nucor Corporation | Method of desulfurizing steel |
| CN109423535A (en) * | 2017-08-29 | 2019-03-05 | 宝钢特钢有限公司 | A kind of technology of high-temperature alloy vacuum induction melting depth desulfurization |
-
2008
- 2008-03-24 CN CN200810035022A patent/CN101545027A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041355B (en) * | 2009-10-23 | 2012-12-12 | 宝山钢铁股份有限公司 | Ladle slag modifier for stainless steel refining process |
| CN102409140A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Refined slag used in steel-making process for bearing steel |
| US8523977B2 (en) | 2011-01-14 | 2013-09-03 | Nucor Corporation | Method of desulfurizing steel |
| CN102382947A (en) * | 2011-11-29 | 2012-03-21 | 南京钢铁股份有限公司 | Low-basicity synthetic slag for external refining |
| CN102382947B (en) * | 2011-11-29 | 2013-05-29 | 南京钢铁股份有限公司 | Low-basicity synthetic slag for external refining |
| CN109423535A (en) * | 2017-08-29 | 2019-03-05 | 宝钢特钢有限公司 | A kind of technology of high-temperature alloy vacuum induction melting depth desulfurization |
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Open date: 20090930 |