CN105714012A - Converter less-slag smelting method for high-silicon molten iron - Google Patents
Converter less-slag smelting method for high-silicon molten iron Download PDFInfo
- Publication number
- CN105714012A CN105714012A CN201410712279.6A CN201410712279A CN105714012A CN 105714012 A CN105714012 A CN 105714012A CN 201410712279 A CN201410712279 A CN 201410712279A CN 105714012 A CN105714012 A CN 105714012A
- Authority
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- China
- Prior art keywords
- slag
- molten iron
- slagging
- controls
- silicon
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000002893 slag Substances 0.000 title claims abstract description 41
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 15
- 239000010703 silicon Substances 0.000 title claims abstract description 15
- 238000003723 Smelting Methods 0.000 title abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 15
- 239000010459 dolomite Substances 0.000 claims abstract description 15
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 11
- 239000004571 lime Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 6
- 241001062472 Stokellia anisodon Species 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 abstract 4
- 241000143432 Daldinia concentrica Species 0.000 abstract 1
- 241001536352 Fraxinus americana Species 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 238000007664 blowing Methods 0.000 abstract 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000008685 targeting Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009628 steelmaking 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
- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A converter less-slag smelting method for high-silicon molten iron adopts a double-slag method to smelt the high-silicon molten iron, the adding amount of lime, light burned dolomite and iron carbon balls is correspondingly determined according to the silicon content of the molten iron before slag discharging, the adding amount of slag charge is controlled to be 1/2 of the total amount, the temperature is controlled to be 1400-1450 ℃, the gun position is controlled to be 240-280 mm, and if the slag is active, the gun position is dropped to 230-240 mm before slag discharging and is kept for 30-50 s. The slag discharging time is selected to be 6-8 min. After slag discharging, the blowing gun position is controlled to be 280-300 mm, and meanwhile, the residual slag is added in batches, wherein each batch is controlled to be 5-10 kg/ton of steel. The invention can effectively solve the splashing phenomenon in the smelting process of the high-silicon molten iron and improve the target hit rate of the end point, thereby reducing the consumption of steel materials, reducing the unit consumption of white ash per ton steel by 0.5kg, reducing the slag running proportion by 50 percent and improving the control level of the process P and the end point P by more than 30 percent.
Description
Technical field
The invention belongs to process for making technical field, particularly to a kind of converter less-slag melting method for high-silicon molten iron.
Background technology
Owing to conditions of blast furnace is out of control, abnormality, the remote ingredient standard claimed range beyond steel-making to molten iron such as cause hot metal composition w [Si] >=1.0%, temperature lower than 1280 DEG C, cause that converter smelting controls difficulty big, splash easily occurring, consumes height, Target hit rate is low waits series of problems.For high-silicon molten iron, usual converter adopts " double slag process " operation, owing to before slagging, the control of rifle position and slagging timing are bad, bits are not put not go out or on the low side, cause the quantity of slag in stove to increase, and steel technology increases, for this, spy of the present invention proposes a kind of converter less-slag melting method of high-silicon molten iron.
Summary of the invention
It is desirable to provide one can effectively solve the problems such as splash and targeting rate in high-silicon molten iron smelting process be low, thus reducing the converter less-slag melting method of steel technology.
For reaching this purpose, this invention takes following solution:
A kind of converter less-slag melting method of high-silicon molten iron, it is characterised in that:
(1) slag charge controls:
Adopt " double slag process " to smelt high-silicon molten iron, before slagging, determine slag charge addition according to molten iron silicon content:
During molten iron Si0.7%～0.9%, add: white lime 10～20t, light dolomite 10～20t, ferrum carbon ball 4～9t；
Molten iron Si content > 0.9%～≤1.0% time, add: white lime 10～20t, light dolomite 10～20t, ferrum carbon ball 1～5t；
During molten iron Si > 1.0%, add: white lime 10～20t, light dolomite 15～25t, ferrum carbon ball 1～5t；
The addition overall control of light dolomite is at 25～35kg/ ton steel；
(2) rifle position controls:
Before slagging, rifle position controls at 240～280mm, if slag enlivens, before slagging, rifle position is dropped down onto 230～240mm, and keeps 30～50s；
After slagging, opening and blow rifle position and control at 280～300mm, be dividedly in some parts residue slag charge simultaneously, every batch controls, at 5～10kg/ ton steel, to descend rifle after adding material gradually；
(3) slagging controls:
Before slagging, slag charge addition controls in the 1/2 of total amount, and temperature controls at 1400～1450 DEG C；Slagging selection of time is between oxygen blast 6～8min.
The invention have the benefit that
The present invention can effectively solve the expulsion events occurred in high-silicon molten iron smelting process, improve terminal targeting rate, thus reducing the consumption of iron and steel stock, white lime ton steel unit consumption is made to reduce 0.5kg, run slag ratio example and reduce by 50%, process P and terminal P controls level and improves more than 30%, and the indices of converter all has clear improvement.
Accompanying drawing explanation
Fig. 1 is Contrast on effect before and after the invention process.
Detailed description of the invention
Embodiment converter charge weight 260 tons, adopts double slag process to smelt.
Embodiment 1:
Control before slagging:
Before slagging, molten iron silicon content 0.8%, add white lime 10t, light dolomite 15t, ferrum carbon ball 6t.Slag charge addition controls in the 1/2 of total amount, and temperature controls at 1400 DEG C；Rifle position controls at 250mm, if slag enlivens, before slagging, rifle position is dropped down onto 235mm, and keeps 45s.
Slagging opportunity: slagging selection of time is at oxygen blast 8min.
Control after slagging:
Opening and blow rifle position and control at 280mm, be dividedly in some parts residue slag charge simultaneously, every batch controls at 8kg/ ton steel, and the addition overall control of light dolomite is at 27kg/ ton steel.Rifle is descended gradually after adding material.
Embodiment 2:
Control before slagging:
Before slagging, molten iron silicon content 0.95%, add white lime 20t, light dolomite 12t, ferrum carbon ball 7t.Slag charge addition controls in the 1/2 of total amount, and temperature controls at 1450 DEG C；Rifle position controls at 280mm.
Slagging opportunity: slagging selection of time is at oxygen blast 8min.
Control after slagging:
Opening and blow rifle position and control at 300mm, be dividedly in some parts residue slag charge simultaneously, every batch controls at 6kg/ ton steel, and the addition overall control of light dolomite is at 25kg/ ton steel.Rifle is descended gradually after adding material.
Embodiment 3:
Control before slagging:
Before slagging, molten iron silicon content 1.3%, add white lime 16t, light dolomite 20t, ferrum carbon ball 8t.Slag charge addition controls in the 1/2 of total amount, and temperature controls at 1430 DEG C；Rifle position controls at 260mm, if slag enlivens, before slagging, rifle position is dropped down onto 230mm, and keeps 35s.
Slagging opportunity: slagging selection of time is at oxygen blast 7min.
Control after slagging:
Opening and blow rifle position and control at 290mm, be dividedly in some parts residue slag charge simultaneously, every batch controls at 10kg/ ton steel, and the addition overall control of light dolomite is at 34kg/ ton steel.Rifle is descended gradually after adding material.
Claims (1)
1. the converter less-slag melting method of a high-silicon molten iron, it is characterised in that: adopt " double slag process " to smelt high-silicon molten iron method particularly includes:
(1) slag charge controls:
Slag charge addition is determined according to molten iron silicon content before slagging:
During molten iron Si0.7%～0.9%, add: white lime 10～20t, light dolomite 10～20t, ferrum carbon ball 4～9t；
Molten iron Si content > 0.9%～≤1.0% time, add: white lime 10～20t, light dolomite 10～20t, ferrum carbon ball 1～5t；
During molten iron Si > 1.0%, add: white lime 10～20t, light dolomite 15～25t, ferrum carbon ball 1～5t；
The addition overall control of light dolomite is at 25～35kg/ ton steel；
(2) rifle position controls:
Before slagging, rifle position controls at 240～280mm, if slag enlivens, before slagging, rifle position is dropped down onto 230～240mm, and keeps 30～50s；
After slagging, opening and blow rifle position and control at 280～300mm, be dividedly in some parts residue slag charge simultaneously, every batch controls, at 5～10kg/ ton steel, to descend rifle after adding material gradually；
(3) slagging controls:
Before slagging, slag charge addition controls in the 1/2 of total amount, and temperature controls at 1400～1450 DEG C；Slagging selection of time is between oxygen blast 6～8min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712279.6A CN105714012A (en) | 2014-12-01 | 2014-12-01 | Converter less-slag smelting method for high-silicon molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712279.6A CN105714012A (en) | 2014-12-01 | 2014-12-01 | Converter less-slag smelting method for high-silicon molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105714012A true CN105714012A (en) | 2016-06-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410712279.6A Pending CN105714012A (en) | 2014-12-01 | 2014-12-01 | Converter less-slag smelting method for high-silicon molten iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105714012A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794331A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | Smelting method for reducing unit consumption of converter flux |
| CN110117689A (en) * | 2019-06-11 | 2019-08-13 | 北京科技大学 | A method of based on high-silicon molten iron converter double slag process low phosphorus steel by smelting |
| CN112210638A (en) * | 2019-07-10 | 2021-01-12 | 山东钢铁股份有限公司 | Converter smelting method for medium and high silicon molten iron |
| CN113789425A (en) * | 2021-09-14 | 2021-12-14 | 鞍钢股份有限公司 | Method for smelting and returning high-silicon molten steel by converter |
| CN113930575A (en) * | 2021-09-23 | 2022-01-14 | 包头钢铁（集团）有限责任公司 | Converter double-slag smelting method for high-silicon high-phosphorus molten iron |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101748237A (en) * | 2009-12-31 | 2010-06-23 | 秦皇岛首秦金属材料有限公司 | Automatic control method for double slag operation of converter |
| CN103060509A (en) * | 2012-03-31 | 2013-04-24 | 上海梅山钢铁股份有限公司 | High-silicon molten iron smelting method |
| CN103333981A (en) * | 2013-06-09 | 2013-10-02 | 武汉钢铁(集团)公司 | Method for smelting high-silicon molten iron by using limestone as slagging material |
| CN103451352A (en) * | 2013-08-29 | 2013-12-18 | 鞍钢股份有限公司 | Automatic control method for converter oxygen lance |
| CN103710485A (en) * | 2014-01-06 | 2014-04-09 | 鞍钢股份有限公司 | Pre-desiliconization method in converter |
-
2014
- 2014-12-01 CN CN201410712279.6A patent/CN105714012A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101748237A (en) * | 2009-12-31 | 2010-06-23 | 秦皇岛首秦金属材料有限公司 | Automatic control method for double slag operation of converter |
| CN103060509A (en) * | 2012-03-31 | 2013-04-24 | 上海梅山钢铁股份有限公司 | High-silicon molten iron smelting method |
| CN103333981A (en) * | 2013-06-09 | 2013-10-02 | 武汉钢铁(集团)公司 | Method for smelting high-silicon molten iron by using limestone as slagging material |
| CN103451352A (en) * | 2013-08-29 | 2013-12-18 | 鞍钢股份有限公司 | Automatic control method for converter oxygen lance |
| CN103710485A (en) * | 2014-01-06 | 2014-04-09 | 鞍钢股份有限公司 | Pre-desiliconization method in converter |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794331A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | Smelting method for reducing unit consumption of converter flux |
| CN110117689A (en) * | 2019-06-11 | 2019-08-13 | 北京科技大学 | A method of based on high-silicon molten iron converter double slag process low phosphorus steel by smelting |
| CN110117689B (en) * | 2019-06-11 | 2020-07-31 | 北京科技大学 | Method for smelting low-phosphorus steel based on high-silicon molten iron converter double-slag method |
| CN112210638A (en) * | 2019-07-10 | 2021-01-12 | 山东钢铁股份有限公司 | Converter smelting method for medium and high silicon molten iron |
| CN112210638B (en) * | 2019-07-10 | 2022-03-11 | 山东钢铁股份有限公司 | Converter smelting method for medium and high silicon molten iron |
| CN113789425A (en) * | 2021-09-14 | 2021-12-14 | 鞍钢股份有限公司 | Method for smelting and returning high-silicon molten steel by converter |
| CN113930575A (en) * | 2021-09-23 | 2022-01-14 | 包头钢铁（集团）有限责任公司 | Converter double-slag smelting method for high-silicon high-phosphorus molten iron |
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Application publication date: 20160629 |
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