CN102634626B - Method for reducing lime consumption of revolving furnace - Google Patents
Method for reducing lime consumption of revolving furnace Download PDFInfo
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- CN102634626B CN102634626B CN201210145157.4A CN201210145157A CN102634626B CN 102634626 B CN102634626 B CN 102634626B CN 201210145157 A CN201210145157 A CN 201210145157A CN 102634626 B CN102634626 B CN 102634626B
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- slag
- converter
- waste slag
- stove
- waste
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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
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
A method for reducing the lime consumption of a revolving furnace belongs to the technical field of steel making of the revolving furnace. According to the method, after the steel tapping of the revolving furnace, the waste slag of an LF (Ladle Furnace) is added in the revolving furnace, the reasonable addition amount and the component requirement of the waste slag are determined as follows: the relationship among tonnage steel addition amount, the waste slag basicity R of the ladle furnace and the weight percent of SiO2 wSiO2 in the slag is that slag amount is equal to 7/R*w(SiO2), and the waste slag of the LF comprises the following key components by weight percent: TFe being less than or equal to 1%, 8%-15% of MgO, 3%-12% of SiO2, and the basicity is more than or equal to 5. According to the method, the safety operation measure that the waste slag of the LF is added into the revolving furnace is demonstrated, CaO in the waste slag of the LF is recycled effectively, and the cost saving purpose that only 10-30% of lime and dolomite is consumed by the revolving furnace can be realized.
Description
Technical field
The invention belongs to converter steeling technology field, particularly provide a kind of converter smelting stage to recycle LF refining furnace castaway slag, thus cost-saving method.
Background technology
In convertor steelmaking process, the basicity general control of slag is between 3-3.8, and in LF refining process, it is higher that the basicity of slag is controlled, and generally, between 5-9, some basicity of slags are even higher, can reach 12.The Waste Slag rate of recovery of LF refining furnace is low, the basic just simple iron reclaiming in slag, and the CaO in slag is seldom recovered utilization, causes the waste of lime.
Summary of the invention
The object of the present invention is to provide a kind of method that reduces converter lime consumption amount, it takes full advantage of LF refining furnace castaway slag, has reduced converter lime consumption amount, has promoted the slag making as early as possible that next stove of converter is smelted simultaneously.
The technical solution of invention is: after converter tapping, adopt converter terminal to stay slag → slag splashing → add LF stove Waste Slag → solidify technique of LF stove Waste Slag.
After converter tapping finishes, during deslagging operation, in stove, retain slag, stay the quantity of slag to be controlled at 8-16 kg/ ton steel.
Slag splashing finishes to add in backward converter the Waste Slag of LF stove, ton steel add-on and Waste Slag basicity---SiO in R, Waste Slag
2mass percent-w (SiO
2) between pass be:
.
The main component of LF stove Waste Slag comprises by mass percent: MgO%:8-15, SiO
2%:3-12; Basicity of slag R>=5.
Add after LF stove castaway slag, grate to slag charge is evenly distributed on converter inwall.
The present invention allows the main component of the LF stove Waste Slag of employing to comprise by mass percent: MgO%:8-15, SiO
2%:3-12; Basicity of slag R>=5.In actual production process, each constituent mass percentage ratio fluctuation range in LF refining slag is larger, and of the present invention focusing on recycled the CaO in LF refining slag, so require basicity of slag R>=5; SiO of the present invention
2massfraction corresponding lower, to improve the utilization ratio of the raw materials such as converter lime; In order to protect furnace lining, in the LF slag that the present invention requires to reclaim, MgO massfraction reaches capacity, in 8% ~ 15% scope.Other compositions in LF slag are guaranteeing, on the normal basis smelting of converter, to recycle to greatest extent LF refining slag;
The present invention adds after LF stove castaway slag, and grate to slag charge is evenly distributed on converter inwall.
Technique effect of the present invention: this invention is compared with traditional converter smelting process, maximum advantage is exactly to save the consumption of lime and light dolomite.In converter steelmaking process, according to unified slag control standard, the pure CaO of loss per ton steel is about 45kg.The all CaO of traditional technology are from furnace charge lime and light dolomite, and consumption is the about 55kg of loss per ton steel lime, consume the about 15kg of light dolomite.And this invention is about under the condition that 45kg is constant at the pure CaO of loss per ton steel, because a upper stove converter terminal stays slag 8 ~ 16kg/ ton steel, after slag splashing, add LF refining furnace Waste Slag, these two operations can provide approximately 7 ~ 15kg/ ton steel of pure CaO, thereby the about 30 ~ 38kg/ ton steel of the pure CaO that need to obtain from furnace charge, like this, save the most at last lime and light dolomite and consume 10%-30%.
Embodiment
Following example is used for setting forth the present invention, but protection scope of the present invention is not limited in following examples.Following instance adopts 220 tons of top and bottom combined blown converters.
Embodiment 1
(1), after converter tapping finishes, in converter, stay the quantity of slag 14 kg/ ton steel;
(2) carry out slag splashing, slag splashing finishes to add in backward converter LF refining furnace Waste Slag.Basicity R=5.65, each constituent mass mark of slag is: CaO=46.61, SiO
2=8.25, MgO=11.46, TFe=1.2, Al
2o
3=30.22, MnO=0.45, P
2o
5=0.004, other impurity=1.806, add-on is 12.70kg/ ton steel;
(3) add after LF refining furnace castaway slag, grate 1 time, grate angle is 85 °, slag is evenly attached to converter inwall;
(4) this operation consumes lime 9639kg altogether, and 2810 tons of light dolomites, with common process ratio, save respectively this two kinds of raw materials 21% and 17%.
Embodiment 2
(1), after converter tapping finishes, in converter, stay quantity of slag 9kg/ ton steel;
(2) carry out slag splashing, slag splashing finishes to add in backward converter LF refining furnace Waste Slag.Basicity R=9.57, each constituent mass mark of slag is: CaO=53.006, SiO
2=5.536, MgO=11.109, TFe=0.674, Al
2o
3=24.620, MnO=0.165, P
2o
5=0.021, other impurity=4.869.Add-on is 14.59kg/ ton steel;
(3) add after LF refining furnace castaway slag, grate 1 time, grate angle is 90 °, slag is evenly attached to converter inwall;
(4) this operation consumes lime 10249kg altogether, and 2912 tons of light dolomites, with common process ratio, save respectively this two kinds of raw materials 16% and 14%.
Claims (2)
1. a method that reduces converter lime consumption amount, is characterized in that: after converter tapping, adopt converter terminal to stay slag → slag splashing → add LF stove Waste Slag → solidify technique of LF stove Waste Slag; After converter tapping finishes, during deslagging operation, in stove, retain slag, stay the quantity of slag to be controlled at 8-16kg/ ton steel, slag splashing finishes to add in backward converter the Waste Slag of LF stove, ton steel add-on and Waste Slag basicity---SiO in R, Waste Slag
2mass percent-w (SiO
2) between pass be:
the main component of described LF stove Waste Slag comprises by mass percent: MgO%:8-15%, SiO
2%:3-12%; Basicity of slag R>=5.
2. a kind of method that reduces converter lime consumption amount according to claim 1, is characterized in that: add after LF stove castaway slag, grate to slag charge is evenly distributed on converter inwall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210145157.4A CN102634626B (en) | 2012-05-11 | 2012-05-11 | Method for reducing lime consumption of revolving furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210145157.4A CN102634626B (en) | 2012-05-11 | 2012-05-11 | Method for reducing lime consumption of revolving furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102634626A CN102634626A (en) | 2012-08-15 |
| CN102634626B true CN102634626B (en) | 2014-04-02 |
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ID=46619201
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210145157.4A Active CN102634626B (en) | 2012-05-11 | 2012-05-11 | Method for reducing lime consumption of revolving furnace |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI500772B (en) * | 2012-10-15 | 2015-09-21 | China Steel Corp | Method for dephosphorization and stabilization of converter |
| CN104451023B (en) * | 2013-09-24 | 2016-08-17 | 上海梅山钢铁股份有限公司 | A kind of smelting process continuing to employ converter warm sludge |
| CN103757173B (en) * | 2014-01-21 | 2015-12-30 | 河北钢铁股份有限公司唐山分公司 | The converter steel making method of low lime consumption |
| CN109762960A (en) * | 2019-02-19 | 2019-05-17 | 邯郸钢铁集团有限责任公司 | A kind of process control method reducing converter smelting lime consumption amount |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337373A (en) * | 2011-11-07 | 2012-02-01 | 秦皇岛首秦金属材料有限公司 | Using method for recovering refining slag and recycling in converter |
-
2012
- 2012-05-11 CN CN201210145157.4A patent/CN102634626B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337373A (en) * | 2011-11-07 | 2012-02-01 | 秦皇岛首秦金属材料有限公司 | Using method for recovering refining slag and recycling in converter |
Non-Patent Citations (1)
| Title |
|---|
| 苏兴文，杨丽华，崔九霄.冶金渣的循环利用——LF炉精炼炉渣用作转炉助熔剂.《第七届中国钢铁年会论文集》.2009,650-653. * |
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| CN102634626A (en) | 2012-08-15 |
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Inventor after: Zhu Guosen Inventor after: Zhang Liguo Inventor after: Wang Xinhua Inventor after: Li Haibo Inventor after: Zhang Gongyan Inventor after: Li Benhai Inventor after: Lv Naibing Inventor after: Cui Yang Inventor after: Liu Gun Inventor after: Nan Xiaodong Inventor before: Zhu Guosen Inventor before: Wang Xinhua Inventor before: Li Haibo Inventor before: Lv Naibing Inventor before: Cui Yang Inventor before: Liu Gun Inventor before: Nan Xiaodong Inventor before: Zhang Liguo |
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Free format text: CORRECT: INVENTOR; FROM: ZHU GUOSEN WANG XINHUA LI HAIBO LV NAIBING CUI YANG LIU KUN NAN XIAODONG ZHANG LIGUO TO: ZHU GUOSEN WANG XINHUA LI HAIBO ZHANG GONGYAN LI BENHAI LV NAIBING CUI YANG LIU KUN NAN XIAODONG ZHANG LIGUO |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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