CN102965463A - Efficient dephosphorization process for converter - Google Patents
Efficient dephosphorization process for converter Download PDFInfo
- Publication number
- CN102965463A CN102965463A CN2012104741969A CN201210474196A CN102965463A CN 102965463 A CN102965463 A CN 102965463A CN 2012104741969 A CN2012104741969 A CN 2012104741969A CN 201210474196 A CN201210474196 A CN 201210474196A CN 102965463 A CN102965463 A CN 102965463A
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- Prior art keywords
- dephosphorization
- slag
- converter
- stage
- rifle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000002893 slag Substances 0.000 claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 8
- 238000005261 decarburization Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 14
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 14
- 239000004571 lime Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 12
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 9
- 239000011574 phosphorus Substances 0.000 abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 7
- 229910000514 dolomite Inorganic materials 0.000 abstract description 7
- 239000010459 dolomite Substances 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 5
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000001458 anti-acid effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
一种转炉高效脱磷的工艺，属于转炉炼钢技术领域，该工艺中，转炉终点炉渣并不倒出，用于下一炉次的脱磷，为了提高循环炉次中脱磷阶段的冶炼效果，通过控制脱磷阶段枪位、供氧、造渣技术手段，实现利用转炉终点炉渣高效脱磷，可节约石灰消耗量，提高转炉脱磷效果，与常规工艺相比，该工艺可节约石灰消耗量40%-60%，节约轻烧白云石消耗量40-46%，而转炉终点钢水中磷的质量分数为0.006%以下。A high-efficiency converter dephosphorization process belongs to the technical field of converter steelmaking. In this process, the slag at the end of the converter is not poured out and is used for dephosphorization in the next furnace. In order to improve the smelting effect of the dephosphorization stage in the cycle furnace , by controlling the gun position, oxygen supply, and slagging technology in the dephosphorization stage, high-efficiency dephosphorization using the slag at the end of the converter can be realized, which can save lime consumption and improve the dephosphorization effect of the converter. Compared with conventional processes, this process can save lime consumption 40%-60% of the amount, saving 40-46% of the consumption of light-burned dolomite, and the mass fraction of phosphorus in the molten steel at the end of the converter is below 0.006%.
Description
Technical field
The invention belongs to the converter steeling technology field, a kind of technique of converter high efficiency dephosphorating particularly is provided.
Background technology
For traditional converter process, slag was all poured out after every stove was smelted tapping.When carrying out next stove smelting, again add the various furnace charges such as lime, this operator scheme lime consumption amount is large, cost is high.Thereby, utilize the slag of converter smelting endpoint to continue dephosphorization, be to solve the large best method of traditional converter operation lime consumption amount.
In traditional converter was produced, in order to reach dephosphorization effect, the backward converter of blowing beginning added the slag making such as lime, does not substantially contain P in the slag charge of adding
2O
5And adopt the converter terminal slag to stay when carrying out dephosphorization in the stove, had the P about 1.5% in the slag
2O
5, compare with traditional technology, because the P in molten steel and the slag
2O
5Concentration gradient is different, if adopt the blowing technology identical with traditional technology, dephosphorization speed is slower, is difficult to the dephosphorization effect that reaches identical with traditional technology.
Summary of the invention
The objective of the invention is to be applied to for the converter terminal slag situation in dephosphorization stage, a kind of technique of converter high efficiency dephosphorating is provided, realize utilizing converter terminal slag high efficiency dephosphorating, can save the lime consumption amount, improve the converter dephosphorization effect.
Technical solution of the present invention is:
A kind of technique of converter high efficiency dephosphorating, the two slag melting techniques of converter comprise and add steel scrap, molten iron → bessemerize dephosphorization → slag of falling the dephosphorization → bessemerize decarburization → converter tapping to stay simultaneously slag.The oxygen supply of dephosphorization stage, residue adjustment red-tape operati step are as follows:
⑴ the converter dephosphorization stage is adopted low rifle bit manipulation, and top blow oxygen lance rifle position is controlled according to following formula: H=3.23 * h
-2+ 1.3, wherein: H is the rifle position, m; H is pool depth, m; Top blast oxygen top blown stirring intensity is: the 3.0-3.5Nm3/min/t steel, and the dephosphorization duration of blast is controlled at 4-5 minute;
⑵ during the rear 2-3min of dephosphorization blowing beginning, add agglomerate, the mass percent of FeO is 9%-15% in the control slag;
⑶ control dephosphorization slag dual alkalinity is 1.2-1.8;
⑷ pour out the 50%-60% of dephosphorization slag, carries out the decarburization stages operating.
The technique of a kind of converter high efficiency dephosphorating of the present invention is owing to the P that bessemerizes in the terminal point slag
2O
5Generally about 1.5%, tapping temperature is more than 1600 ℃ for massfraction.Aspect technology controlling and process, slag and the phosphorus content in the molten steel of bessemerizing terminal point are relatively stable, and slag has not substantially possessed dephosphorizing capacity, but dephosphorisation reaction belongs to thermo-negative reaction, if temperature reduces, the converter terminal slag can possess dephosphorizing capacity again.Compare with converter terminal, before bessemerizing beginning, the phosphorus content in the molten iron is higher, temperature is lower, when the converter terminal slag used in the dephosphorization stage, can again have dephosphorization effect, thus converter tapping finish after the terminal point slag stay in the stove and can again bring into play dephosphorization effect.
In view of the thermodynamics characteristics of converter terminal slag, in order effectively to utilize converter terminal slag dephosphorization, purpose of the present invention just is to provide the control main points of technological process medium power, thermodynamical coordinate, to realize utilizing converter terminal slag high efficiency dephosphorating.
The key of traditional theory research dephosphorization is: lower bath temperature, higher basicity of slag, high oxidisability etc.In process of production, in order to realize dephosphorization effect, control the control that realizes phosphorus content from the following aspects: contain high FeO content (1) control slag, realize the oxidation of phosphorus; (2) improve basicity of slag, (3) cold melt.
When adopting the converter terminal slag to be applied to the dephosphorization stage during dephosphorization, because P in the slag
2O
5Content is higher, in order to reach the dephosphorization purpose, should provide good dynamic conditions, strengthens the stirring in molten bath.So this process using top blow oxygen lance hangs down rifle position, high oxygen supply intensity blowing technology, dephosphorization stage oxygen lance position routine is bessemerized the low 100 ~ 200mm of rifle potential drop in early stage, and oxygen supply intensity remains on 3.0-3.5Nm
3More than/the min/t, melting bath stirring is promoted [P] that dissolve in the molten iron transmit to slag/iron interface by strengthening the top blowing oxygen air-flow, remedying in the front slag of blowing has had 1.5% P
2O
5The slower problem of the mass transfer that the concentration gradient that content causes causes.
Can cause FeO content in the slag for low rifle position, the blowing of high oxygen supply speed, along with FeO content in the slag, the indirect oxidation effect of molten steel weakens, the flowability of slag also can be affected, in order to remedy this problem, this technique dephosphorization stage has improved the iron ore add-on and has added batch, to guarantee strengthening melting bath stirring simultaneously, has enough FeO content (9%-15%) in the slag, to obtain good thermodynamics dephosphorization effect.
Technique effect of the present invention: adopt the high efficiency dephosphorating technique of these research and development, the dephosphorization stage finishes, and dephosphorization rate average out to 〉=55% is at staying slag P
2O
5In the content 1.5% above situation, surpassed the conventional dephosphorization rate of bessemerizing early stage.Because dephosphorization stage dephosphorization efficient is high, dephosphorization finishes P in the slag
2O
5Mass percent can reach 2%-2.7%, in the decarburization stage endpoint molten steel massfraction of phosphorus can be removed to≤0.0060%, this proves absolutely that this technique has good dephosphorization effect, can satisfy most steel grade phosphorus content control requirements except minority ultra-low phosphoretic steel kind (such as antiacid pipe line steel).
Embodiment
Main technique of the present invention comprises following content:
(1) after converter tapping finishes, not deslagging, slag is stayed in the tile stove, for next stove blowing stage dephosphorization;
(2) the converter dephosphorization stage is adopted low rifle bit manipulation, and top blow oxygen lance rifle position is controlled according to following formula: H=3.23 * h
-2+ 1.3, wherein: H is the rifle position, m; H is pool depth, m; In the production process of reality, the factors such as the design variable of rifle position and oxygen rifle, oxygen rifle gaseous tension, converter shape are relevant, eigenwert according to oxygen rifle and each correlation parameter of converter of different converters, after the recurrence, when obtaining adopting the common process converter steelmaking, the pass of rifle position and pool depth is: H=3.23 * h
-2+ 1.5.In this technique, take low rifle bit manipulation, to strengthen oxygen rifle top-blown gas to the stirring in molten bath, on the basis of great many of experiments, when obtaining low rifle position dephosphorization, the rifle position should be according to H=3.23 * h
-2+ 1.3 controls simultaneously, cooperate top blowing oxygen gas agitating intensity to be: the 3.0-3.5Nm3/min/t steel, and the dephosphorization duration of blast is controlled at 4-5 minute;
When (3) the dephosphorization blowing begins rear 2-3min, add agglomerate, the mass percent of FeO is 9%-15% in the control slag; The main purpose that increases the FeO content in the slag is: when the mass percent of FeO in the slag reached 9%-15%, the oxidisability of slag was strong, can reach the dephosphorization under oxidizing atmosphereLin Fenpeibi requirement;
(4) the slag dual alkalinity is controlled to be 1.2-1.8, and the dephosphorization stage, the dynamic conditions of molten steel was fine owing to adopted low rifle bit manipulation, do not need by adding large quantities of lime, improve basicity and come dephosphorization, not only saved raw material, also increased the flowability of slag;
(5) pour out the 50%-60% of dephosphorization slag, carry out the decarburization stages operating.
Following table 1 to table 8 has been listed the key parameter example of the present invention when 210 tons and 100 tons of top and bottom combined blown converters are produced low-phosphorus molten steel.But protection scope of the present invention is not limited in following examples.
210 tons of combined blown converter Top Blown Process of table 1 key parameter
| Heat | Converter rifle position, m | The top blast stirring intensity, Nm3/min/t | The dephosphorization duration of blast, min |
| 1 | 2.4 | 3.3 | 4.2 |
| 2 | 2.2 | 3.3 | 4.5 |
| 3 | 2.3 | 3.5 | 4.6 |
210 tons of converter agglomerate of table 2 add the technology key parameter
| Heat | Blow the zero hour | Add agglomerate constantly | The agglomerate add-on, t | FeO massfraction in the dephosphorized slag, % | Dephosphorization stage deslagging ratio, % |
| 1 | 18:27:32 | 18:29:45 | 1.8 | 9.35 | 52 |
| 2 | 03：05:05 | 03:07:32 | 2.3 | 14.32 | 58 |
| 3 | 04：52:17 | 04:54:57 | 2.1 | 12.75 | 53 |
210 tons of converter terminal molten steel composition control of table 3 level
210 tons of converter smelting slag charges of table 4 consumption control level
| Heat | Actual consumption lime, kg/ ton steel | Traditional technology consumes lime, kg/ ton steel | Save lime consumption, % | The actual consumption light dolomite, kg/ ton steel | Traditional technology consumes light dolomite, kg/ ton steel | Save the light dolomite consumption, % |
| 1 | 24.2 | 55 | 56 | 10.3 | 17.8 | 42 |
| 2 | 23.4 | 52 | 55 | 9.4 | 16.5 | 43 |
| 3 | 22.7 | 48 | 53 | 8.7 | 15.9 | 45 |
100 tons of combined blown converter Top Blown Process of table 5 key parameter
| Heat | Converter rifle position, m | The top blast stirring intensity, Nm3/min/t | The dephosphorization duration of blast, min |
| a | 1.2 | 3.4 | 4.6 |
| b | 1.2 | 3.3 | 4.3 |
| c | 1.3 | 3.5 | 4.1 |
100 tons of converter agglomerate of table 6 add the technology key parameter
| Heat | Blow the zero hour | Add agglomerate constantly | The agglomerate add-on, t | FeO massfraction in the dephosphorized slag, % | Dephosphorization stage deslagging ratio, % |
| a | 14:21:38 | 14:24:25 | 1.1 | 9．89 | 54 |
| b | 16:02:02 | 16:04:33 | 0.9 | 12.17 | 54 |
| c | 23:21:47 | 23:24:20 | 1.2 | 13.34 | 57 |
100 tons of converter terminal molten steel composition control of table 7 level
100 tons of converter smelting slag charges of table 8 consumption control level
| Heat | Actual consumption lime, kg/ ton steel | Traditional technology consumes lime, kg/ ton steel | Save lime consumption, % | The actual consumption light dolomite, kg/ ton steel | Traditional technology consumes light dolomite, kg/ ton steel | Save the light dolomite consumption, % |
| a | 22.9 | 46 | 50 | 8.7 | 15.3 | 43 |
| b | 23.3 | 47 | 50 | 9.7 | 16.3 | 40.5 |
| c | 24.5 | 55 | 55 | 10.8 | 18.0 | 40 |
Claims (1)
1. the technique of a converter high efficiency dephosphorating, the two slag melting techniques of converter comprise and add steel scrap, molten iron → bessemerize dephosphorization → slag of falling the dephosphorization → bessemerize decarburization → converter tapping to stay simultaneously slag, it is characterized in that: the oxygen supply of dephosphorization stage, residue adjustment red-tape operati step are as follows:
(1) the converter dephosphorization stage is adopted low rifle bit manipulation, and top blow oxygen lance rifle position is controlled according to following formula: H=3.23 * h
-2+ 1.3, wherein: H is the rifle position, m; H is pool depth, m; Top blast oxygen top blown stirring intensity is: the 3.0-3.5Nm3/min/t steel, and the dephosphorization duration of blast is controlled at 4-5 minute;
When (2) the dephosphorization blowing begins rear 2-3min, add agglomerate, the mass percent of FeO is 9%-15% in the control slag;
(3) control dephosphorization slag dual alkalinity is 1.2-1.8;
(4) pour out the 50%-60% of dephosphorization slag, carry out the decarburization stages operating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210474196.9A CN102965463B (en) | 2012-11-21 | 2012-11-21 | Efficient dephosphorization process for converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210474196.9A CN102965463B (en) | 2012-11-21 | 2012-11-21 | Efficient dephosphorization process for converter |
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| Publication Number | Publication Date |
|---|---|
| CN102965463A true CN102965463A (en) | 2013-03-13 |
| CN102965463B CN102965463B (en) | 2014-05-28 |
Family
ID=47795899
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|---|---|---|---|
| CN201210474196.9A Active CN102965463B (en) | 2012-11-21 | 2012-11-21 | Efficient dephosphorization process for converter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614506A (en) * | 2013-12-01 | 2014-03-05 | 武钢集团昆明钢铁股份有限公司 | Method for converter steelmaking by using small-particle grade high-basicity sintered ore |
| CN103882178A (en) * | 2014-04-01 | 2014-06-25 | 首钢总公司 | Converter steelmaking process for recycling converter final slag |
| CN105039638A (en) * | 2015-08-27 | 2015-11-11 | 宝山钢铁股份有限公司 | High-density pellet for dephosphorization of converter and using method of high-density pellet |
| CN105112595A (en) * | 2015-07-24 | 2015-12-02 | 北京科技大学 | Smelting method capable of realizing phosphorus content of less than 70ppm in high-carbon converter tapping |
| CN105112599A (en) * | 2015-08-31 | 2015-12-02 | 桂林昌鑫机械制造有限公司 | Method for smelting ultra-low phosphorus steel |
| CN105821177A (en) * | 2016-05-03 | 2016-08-03 | 首钢京唐钢铁联合有限责任公司 | Converter full-three-removal process method and method for reducing total slag amount |
| CN110387448A (en) * | 2019-08-19 | 2019-10-29 | 中天钢铁集团有限公司 | A kind of method that converter rapid low consumption produces low-phosphorous special steel |
| CN112877496A (en) * | 2021-01-14 | 2021-06-01 | 安徽工业大学 | Method for realizing efficient dephosphorization in dephosphorization period by controlling phase of slagging process |
| CN113073168A (en) * | 2021-03-05 | 2021-07-06 | 中天钢铁集团有限公司 | Rapid smelting method of low-phosphorus steel converter |
| CN115369308A (en) * | 2022-07-15 | 2022-11-22 | 首钢京唐钢铁联合有限责任公司 | Method for producing high-strength IF steel |
| CN116024399A (en) * | 2021-10-26 | 2023-04-28 | 上海梅山钢铁股份有限公司 | A method for smelting leftover molten steel in a rotary furnace |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614506A (en) * | 2013-12-01 | 2014-03-05 | 武钢集团昆明钢铁股份有限公司 | Method for converter steelmaking by using small-particle grade high-basicity sintered ore |
| CN103882178A (en) * | 2014-04-01 | 2014-06-25 | 首钢总公司 | Converter steelmaking process for recycling converter final slag |
| CN105112595A (en) * | 2015-07-24 | 2015-12-02 | 北京科技大学 | Smelting method capable of realizing phosphorus content of less than 70ppm in high-carbon converter tapping |
| CN105039638A (en) * | 2015-08-27 | 2015-11-11 | 宝山钢铁股份有限公司 | High-density pellet for dephosphorization of converter and using method of high-density pellet |
| CN105112599B (en) * | 2015-08-31 | 2018-02-27 | 浙江博盛不锈钢制造有限公司 | A kind of ultra-low phosphoretic steel smelting process |
| CN105112599A (en) * | 2015-08-31 | 2015-12-02 | 桂林昌鑫机械制造有限公司 | Method for smelting ultra-low phosphorus steel |
| CN105821177A (en) * | 2016-05-03 | 2016-08-03 | 首钢京唐钢铁联合有限责任公司 | Converter full-three-removal process method and method for reducing total slag amount |
| CN110387448A (en) * | 2019-08-19 | 2019-10-29 | 中天钢铁集团有限公司 | A kind of method that converter rapid low consumption produces low-phosphorous special steel |
| CN110387448B (en) * | 2019-08-19 | 2021-01-22 | 中天钢铁集团有限公司 | Method for producing low-phosphorus special steel quickly and low in consumption by converter |
| CN112877496A (en) * | 2021-01-14 | 2021-06-01 | 安徽工业大学 | Method for realizing efficient dephosphorization in dephosphorization period by controlling phase of slagging process |
| CN113073168A (en) * | 2021-03-05 | 2021-07-06 | 中天钢铁集团有限公司 | Rapid smelting method of low-phosphorus steel converter |
| CN116024399A (en) * | 2021-10-26 | 2023-04-28 | 上海梅山钢铁股份有限公司 | A method for smelting leftover molten steel in a rotary furnace |
| CN115369308A (en) * | 2022-07-15 | 2022-11-22 | 首钢京唐钢铁联合有限责任公司 | Method for producing high-strength IF steel |
| CN115369308B (en) * | 2022-07-15 | 2023-09-15 | 首钢京唐钢铁联合有限责任公司 | A method for producing high-strength IF steel |
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| CN102965463B (en) | 2014-05-28 |
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