CN106591533A - IF steel top slag modifying method - Google Patents
IF steel top slag modifying method Download PDFInfo
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- CN106591533A CN106591533A CN201611023302.6A CN201611023302A CN106591533A CN 106591533 A CN106591533 A CN 106591533A CN 201611023302 A CN201611023302 A CN 201611023302A CN 106591533 A CN106591533 A CN 106591533A
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- slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
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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 provides an IF steel top slag modifying method. The method comprises the steps that when a converter smelting end point is reached, converter pouring is conducted, a slag sample is taken, and the content of CaO, the content of FeO and the content of SiO2 are assayed; the adding amount of lime in the steel tapping process is determined according to the content of SiO2, wherein when the content of SiO2 ranges from 5 wt% to 8 wt%, 1.9 kg of lime is added to each ton of steel, when the content of SiO2 ranges from 9 wt% to 12 wt%, 2.5 kg of lime is added to each ton of steel, and when the content of SiO2 is larger than 12 wt%, 3.0 kg of lime is added to each ton of steel; and after steel tapping is finished, aluminum slag is added for modification according to the content of FeO in the measured slag sample, wherein when the content of FeO is larger than 25 wt%, 2.3 kg of the aluminum slag is added to each ton of steel, when the content of FeO is smaller than or equal to 25 wt%, 1.5 kg of the aluminum slag is added to each ton of steel, and it is guaranteed that FeO in top slag is lower than 10 wt%. According to the IF steel top slag modifying method, C/A in the top slag can be effectively controlled to range from 1.2 to 1.8, the capacity of the top slag for adsorbing slag inclusions is guaranteed, and molten steel cleanness is improved.
Description
Technical field
The present invention relates to Ferrous Metallurgy smelting process technical field, more particularly to a kind of method of IF steel top slag modification.
Background technology
The production process of IF steel is generally converter → RH → continuous casting, so containing turning for FeO in converter tapping process part
Slag is entered in ladle, along with whole RH processes.High oxidative slag can be polluted in RH processing procedures to molten steel, so
Most of steel mill can carry out pushing up slag modification after Converter.Nippon Steel adds modification agent complete in slag when IF steel is smelted, after tapping
Fe element mass fractions（T.Fe）It is reduced to below 4 wt %, the surface defect of cold-reduced sheet can be reduced to the 1/6 of conventional flat；
The testing result of NKK shows, after slag deoxidation treatment, the surface defect index decreased of ultra-low-carbon steel 80%.
Ladle top slag modification will equally keep pushing up slag to Al while FeO contents in reducing slag2O3The absorbability of type impurity；Control
Suitable C/A in slag processed【(CaO wt%)/ (Al2O3wt%)】Ratio, can effectively reduce the activity of FeO in slag, and reduce
Slag and Al2O3Between angle of wetting, beneficial to such absorption being mingled with, it is therefore desirable to suitable C/A values in slag are controlled, to improve top
Slag is to Al2O3The adsorption capacity of type impurity.Kawasaki, Japan research thinks, produce the ratio that C/A is controlled during IF steel 1.2 ~
Dross inclusion adsorption is utilized between 1.8, but this control range is larger and does not have specific standards, therefore, how to control top slag and change
The addition of various modification agents during matter, is of great significance with reaching preferable C/A values tool.
The content of the invention
The technical problem to be solved is to provide a kind of method of IF steel top slag modification, according to different vessel slag feelings
Condition controls the addition of lime and aluminium slag and adds opportunity, and to reach control purposes of the C/A between 1.2 ~ 1.8 in slag is pushed up, and protects
The ability of card top slag dross inclusion adsorption, improves Cleanliness of Molten Steel, improves the castability of molten steel.
For achieving the above object, the technical solution used in the present invention is：
A kind of method of IF steel top slag modification, its concrete grammar and step are：
（1）, converter smelting endpoint when, stove takes slag specimen and carries out CaO, FeO and SiO2The chemical examination of content；
（2）, according to SiO in slag2Content determine in tapping process add lime amount：Work as SiO2Content is between 5 ~ 8 wt%
When, add lime 1.9kg/t steel；Work as SiO2Content between 9 ~ 12 wt% when, add lime 2.5kg/t steel；Work as SiO2Content is more than
During 12 wt%, lime 3.0kg/t steel is added；
（3）, tapping terminate after according to step（1）The content of FeO in surveyed slag specimen, adds aluminium slag to be modified：As FeO in slag specimen
Content>During 25 wt %, aluminium slag 2.3kg/t steel is added；During the wt % of FeO content≤25, aluminium slag 1.5kg/t steel is added；Ensure top
FeO contents are less than 10 wt % in slag, and work as SiO2In 1 ~ 3 wt %, C/A values are 1.2～1.3 to content；Work as SiO2Content 4 ~
During 7 wt %, C/A values are 1.4 ~ 1.5；Work as SiO2When content is higher than 8 wt %, C/A values are 1.6 ~ 1.8.
A kind of method of above-mentioned IF steel top slag modification, the step（1）Middle requirement was completed in slag specimen in 10 minutes
CaO, FeO and SiO2Components tests；The step（2）In add lime into ladle when converter tapping is to 1/2 ~ 2/3, go out
Whole Argon during steel, it is ensured that be sufficiently stirred for, be completely melt slag.
A kind of method of above-mentioned IF steel top slag modification, the step（3）The composition of middle aluminium slag is：
Al：30 ~ 35wt%, Al2O3：20 ~ 30wt%, CaCO3:30~40wt%。
Inventive principle is analyzed：
Application claims completed CaO, FeO and SiO in slag specimen in 10 minutes2Components tests, it is ensured that the precision of its composition, be
Modification agent and lime is added to provide accurate foundation according to slag specimen composition in follow-up tapping process；The addition analysis of aluminium slag：250t
Converter is operated using pushing off the slag, and in 5kg/t steel or so, if FeO contents are 25wt% in its slag, FeO contains general its lower quantity of slag in slag
Measure as 1.25kg/t, and add aluminium slag 1.5kg/t, Al content is generally 30% or so in aluminium slag, then the Al content in aluminium slag is
0.45kg/t, react enough it is scaling-off in 15% FeO, it is ensured that top slag in FeO contents be less than 10 wt %；According to Factsage7.0
Calculating shows, in CaO-Al2O3-FeO-SiO2In quaternary slag system, SiO2Content influence whether the change in low melting point region in slag
Change, with SiO in slag2The rising of content, its low melting point region can gradually to the direction movement of deflection CaO, and this explanation is with SiO2
Content increases, and needs the value for improving C/A in slag just to can guarantee that ladle top slag is in the relatively low region of fusing point, beneficial to the fusing of slag,
Be conducive to pushing up the field trash in slag absorption steel；Fig. 1～Fig. 3 is SiO in slag2Content is respectively 2 wt %, 6 wt % and 8 wt %
When, the situation of change in slag low melting point region, it can be seen that working as FeO in slag is less than 10%, and SiO2Content be 2wt%,
Respectively at 1.2,1.4 ~ 1.5 and 1.6 ~ 1.8, slag is in low melting point region to the value of 6wt% and 8wt%, C/A；According to field experience,
After lime and aluminium slag are added, SiO in slag2Content can reduce by 4 ~ 5%, so according to SiO in vessel slag2Content prepare slag into
Timesharing, SiO2Content is slightly higher, draws step（2）With（3）The addition of middle lime and aluminium slag.
Beneficial effects of the present invention are：
The present invention controls the addition of lime and aluminium slag and adds opportunity according to different vessel slag situations, can be in the slag of effective control top
C/A is between 1.2 ~ 1.8, it is ensured that the ability of top slag dross inclusion adsorption, improves Cleanliness of Molten Steel, improves the castability of molten steel.
Description of the drawings
Fig. 1 is CaO-FeO-Al in the principle of the invention2O3-SiO2Quarternary phase diagram low melting point region during=2wt%；
Fig. 2 is CaO-FeO-Al in the principle of the invention2O3-SiO2Quarternary phase diagram low melting point region during=6wt%；
Fig. 3 is CaO-FeO-Al in the principle of the invention2O3-SiO2Quarternary phase diagram low melting point region during=8wt%.
Specific embodiment
The present invention is calculated according to Factsage7.0, in CaO-Al2O3-FeO-SiO2In quaternary slag system, SiO2Contain
Amount influences whether the change in low melting point region in slag, with SiO in slag2The rising of content, its low melting point region can gradually to inclined
Move to the direction of CaO, this explanation is with SiO2Content increases, and needs the value for improving C/A in slag just to can guarantee that at ladle top slag
In the relatively low region of fusing point, beneficial to the fusing of slag, be conducive to pushing up the field trash in slag absorption steel；Fig. 1～Fig. 3 is SiO in slag2Contain
When amount is respectively 2 wt %, 6 wt % and 8 wt %, the situation of change in slag low melting point region, it can be seen that working as in slag
FeO is less than 10wt%, and SiO2Content is 2wt%, 6wt% and 8wt%, the value of C/A respectively at 1.2,1.4 ~ 1.5 and 1.6 ~ 1.8,
Slag is in low melting point region；According to field experience, after lime and aluminium slag are added, SiO in slag2Content can reduce by 4 ~ 5%, institute
With according to SiO in vessel slag2When content prepares slag ingredient, SiO2Content is slightly higher, draws the addition of lime of the present invention and aluminium slag
Amount.
A kind of method of IF steel top slag modification of the present invention, its concrete grammar and step are：
（1）, converter smelting endpoint when, stove takes slag specimen, and within 10 minutes CaO, FeO and SiO were completed2The chemical examination of content；Protect
The precision of its composition is demonstrate,proved, to add modification agent and lime to provide accurate foundation according to slag specimen composition in follow-up tapping process；
（2）, according to SiO in slag2Content determine in tapping process add lime amount：When converter tapping is to 1/2 ~ 2/3
Lime is added into ladle, works as SiO2Content between 5 ~ 8 wt% when, add lime 1.9kg/t steel；Work as SiO2Content is between 9 ~ 12
During wt%, lime 2.5kg/t steel is added；Work as SiO2When content is more than 12 wt%, lime 3.0kg/t steel is added；It is complete in tapping process
Journey Argon, it is ensured that be sufficiently stirred for, is completely melt slag.
（3）, tapping terminate after according to step（1）The content of FeO in surveyed slag specimen, adds aluminium slag to be modified：Work as slag specimen
Middle FeO contents>During 25 wt %, aluminium slag 2.3kg/t steel is added；During the wt % of FeO content≤25, aluminium slag 1.5kg/t steel is added；Protect
FeO contents are less than 10 wt % in the slag of card top, and work as SiO2In 1 ~ 3 wt %, C/A values are 1.2～1.3 to content；Work as SiO2Content
In 4 ~ 7 wt %, C/A values are 1.4 ~ 1.5；Work as SiO2When content is higher than 8 wt %, C/A values are 1.6 ~ 1.8；The composition of aluminium slag
For：Al：30 ~ 35wt%, Al2O3：20 ~ 30wt%, CaCO3:30~40wt%。
With reference to embodiment, the present invention will be further described.
Embodiment adopts tap for 260 tons of converters, and process steel grade is IF steel, and converter tapping ladle slag is thick to be less than 80mm.
Embodiment 1：
（1）, converter smelting endpoint when, stove takes after slag specimen cooling at once and sends to chemical examination slag ingredient, and wherein CaO compositions are 51.3
Wt %, FeO composition is 26.1wt%, SiO2Composition is 12wt%；
（2）, according to SiO in slag2Content at converter tapping 1/2 ~ 2/3 into ladle add lime 800kg, tapping process
Middle whole Argon, it is ensured that be sufficiently stirred for, is completely melt slag；
（3）, tapping terminate the backward top of the slag and be uniformly added into aluminium slag 600kg, top slag fusing is all right；
（4）, RH SiO in slag is measured when entering the station2Content 6.0wt%, FeO contents 7.8wt%, C/A values 1.7, top of the slag fusing situation is good
Good, T [O]=28ppm in molten steel after RH process, strand T [O]=14ppm, this heat cast is all right, nozzle blockage does not occur
Situation, there is not defect in hot rolling cold-rolled process after strand.
Embodiment 2：
（1）, converter smelting endpoint when, stove takes slag specimen, at once cooling send to chemical examination slag ingredient, wherein CaO compositions are
48.1wt%, FeO composition is 29.8wt%, SiO2Composition is 9.8wt%；
（2）, according to SiO in slag2Content at converter tapping 1/2 ~ 2/3 into ladle add lime 650kg, in tapping process
Whole Argon, it is ensured that be sufficiently stirred for, is completely melt slag；
（3）, tapping terminate the backward top of the slag and be uniformly added into aluminium slag 600kg, top slag fusing is all right；
（4）, RH SiO in slag is measured when entering the station2Content 7.9wt%, FeO contents 9.1wt%, C/A values 1.7, top of the slag fusing situation is good
Good, T [O]=30ppm in molten steel after RH process, strand T [O]=15ppm, this heat cast is all right, nozzle blockage does not occur
Situation, there is not defect in hot rolling cold-rolled process after strand.
Embodiment 3
（1）, converter smelting endpoint when, stove takes slag specimen, at once cooling send to chemical examination slag ingredient, wherein CaO compositions are
50.1wt%, FeO composition is 21.8wt%, SiO2Composition is 6wt%；
（2）, according to SiO in slag2Content at converter tapping 1/2 ~ 2/3 into ladle add lime 500kg, in tapping process
Whole Argon, it is ensured that be sufficiently stirred for, is completely melt slag；
（3）, tapping terminate the backward top of the slag and be uniformly added into aluminium slag 400kg, top slag fusing is all right；
（4）, RH SiO in slag is measured when entering the station2Content 3.4wt%, FeO contents 8.3wt%, C/A values 1.2, top of the slag fusing situation is good
Good, T [O]=28ppm in molten steel after RH process, strand T [O]=13ppm, this heat cast is all right, nozzle blockage does not occur
Situation, there is not defect in hot rolling cold-rolled process after strand.
Embodiment 4
（1）, converter smelting endpoint when, stove takes slag specimen, at once cooling send to chemical examination slag ingredient, wherein CaO compositions are
47.95wt%, FeO composition is 18.24wt%, SiO2Composition is 12.99wt%；
（2）, according to SiO in slag2Content at converter tapping 1/2 ~ 2/3 into ladle add lime 800kg, in tapping process
Whole Argon, it is ensured that be sufficiently stirred for, is completely melt slag；
（3）, tapping terminate the backward top of the slag and be uniformly added into aluminium slag 400kg, top slag fusing is all right；
（4）, RH SiO in slag is measured when entering the station2Content 6.46wt%, FeO contents 8.66wt%, C/A values 1.5, top of the slag fusing situation
Well, T [O]=25ppm in molten steel after RH is processed, strand T [O]=13ppm, this heat cast is all right, mouth of a river resistance does not occur
Plug situation, there is not defect in hot rolling cold-rolled process after strand.
Claims (3)
1. a kind of method that IF steel top slag is modified, it is characterised in that：Using following steps：
（1）, converter smelting endpoint when, stove takes slag specimen and carries out CaO, FeO and SiO2The chemical examination of content；
（2）, according to SiO in slag2Content determine in tapping process add lime amount：Work as SiO2Content is between 5 ~ 8 wt%
When, add lime 1.9kg/t steel；Work as SiO2Content between 9 ~ 12 wt% when, add lime 2.5kg/t steel；Work as SiO2Content is more than
During 12 wt%, lime 3.0kg/t steel is added；
（3）, tapping terminate after according to step（1）The content of FeO in surveyed slag specimen, adds aluminium slag to be modified：As FeO in slag specimen
Content>During 25 wt %, aluminium slag 2.3kg/t steel is added；During the wt % of FeO content≤25, aluminium slag 1.5kg/t steel is added；Ensure top
FeO contents are less than 10 wt % in slag, and work as SiO2In 1 ~ 3 wt %, C/A values are 1.2～1.3 to content；Work as SiO2Content 4 ~
During 7 wt %, C/A values are 1.4 ~ 1.5；Work as SiO2When content is higher than 8 wt %, C/A values are 1.6 ~ 1.8.
2. the method that a kind of IF steel top slag as claimed in claim 1 is modified, it is characterised in that：The step（1）It is middle to require
CaO, FeO and SiO in slag specimen is completed in 10 minutes2Components tests；The step（2）In when converter tapping is to 1/2 ~ 2/3
Lime is added into ladle, whole Argon in tapping process, it is ensured that be sufficiently stirred for, be completely melt slag.
3. the method that a kind of IF steel top slag as claimed in claim 1 is modified, it is characterised in that：The step（3）Middle aluminium slag
Composition is：
Al：30 ~ 35wt%, Al2O3：20 ~ 30wt%, CaCO3:30~40wt%。
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| CN201611023302.6A CN106591533A (en) | 2016-11-21 | 2016-11-21 | IF steel top slag modifying method |
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| CN201611023302.6A CN106591533A (en) | 2016-11-21 | 2016-11-21 | IF steel top slag modifying method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109722501A (en) * | 2019-03-20 | 2019-05-07 | 马鞍山钢铁股份有限公司 | A kind of ladle top slag method for modifying suitable for IF steel |
| CN111254247A (en) * | 2020-01-21 | 2020-06-09 | 江苏省沙钢钢铁研究院有限公司 | Method for controlling titanium-containing IF steel continuous casting nozzle nodulation |
| CN114807497A (en) * | 2022-03-28 | 2022-07-29 | 邯郸钢铁集团有限责任公司 | Method for smelting high-silicon molten iron by using bottom oxygen blowing and lime powder combined blowing converter |
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| CN101760583A (en) * | 2009-12-22 | 2010-06-30 | 马鞍山钢铁股份有限公司 | Method for controlling impurity in ultra low carbon IF steel |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101760583A (en) * | 2009-12-22 | 2010-06-30 | 马鞍山钢铁股份有限公司 | Method for controlling impurity in ultra low carbon IF steel |
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| 倪亚平: "IF钢冶炼技术设计与应用", 《中国优秀硕士学位论文全文数据库（电子期刊），工程科技I辑》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109722501A (en) * | 2019-03-20 | 2019-05-07 | 马鞍山钢铁股份有限公司 | A kind of ladle top slag method for modifying suitable for IF steel |
| CN109722501B (en) * | 2019-03-20 | 2021-01-26 | 马鞍山钢铁股份有限公司 | Ladle top slag modification method suitable for IF steel |
| CN111254247A (en) * | 2020-01-21 | 2020-06-09 | 江苏省沙钢钢铁研究院有限公司 | Method for controlling titanium-containing IF steel continuous casting nozzle nodulation |
| CN114807497A (en) * | 2022-03-28 | 2022-07-29 | 邯郸钢铁集团有限责任公司 | Method for smelting high-silicon molten iron by using bottom oxygen blowing and lime powder combined blowing converter |
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