CN108384917A - A kind of converter is followed by the modification agent and application method of the anti-slag crust of RH vacuum - Google Patents
A kind of converter is followed by the modification agent and application method of the anti-slag crust of RH vacuum Download PDFInfo
- Publication number
- CN108384917A CN108384917A CN201810176738.1A CN201810176738A CN108384917A CN 108384917 A CN108384917 A CN 108384917A CN 201810176738 A CN201810176738 A CN 201810176738A CN 108384917 A CN108384917 A CN 108384917A
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- CN
- China
- Prior art keywords
- modification agent
- slag
- added
- tapping
- granularity
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Classifications
-
- 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
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A kind of converter is followed by the modification agent and application method of the anti-slag crust of RH vacuum, belongs to steelmaking technical field.Modification agent chemical component weight percentage is CaO：0~25%, MgO：0~5%, SiO2：2~12%, Al2O3：40~90%, CaF2：0~25%, surplus is inevitable impurity；Its chemical component weight percentage is pressed first and configures modifying agent, and the top of the slag is added to after being added to before tapping in Ladle Bottom, tapping process with the addition of steel stream and then tapping or tapping and carries out Bottom Argon Stirring.The advantage is that it is at low cost, it is simple to manufacture, effect is good；It effectively prevent the problem of slag crusts and is not easy to melt later in RH processing procedures.
Description
Technical field
The invention belongs to steelmaking technical field, more particularly to a kind of converter be followed by RH vacuum anti-slag crust modification agent and
Application method.
Background technology
Currently, generally using converter-when producing mild steel or ultra-low-carbon steel or the steel grade very high to hydrogen requirement of nitrogen
The process route of RH vacuum refinings, and the temperature drop of such process route molten steel is very big, and in RH application of vacuum due to molten steel
Surface relatively placidity, and the fusing point of slag system is higher, so the phenomenon that be easy to causeing slag crust, affect subsequent continuous casting or after
Continuous others refinery practice, the effect for reaching heat preservation by the way of the addition coverture after converter tapping or synthetic slag general at present
Fruit, but the general phosphorus content of coverture is higher, is easy to cause carburetting to molten steel, therefore can not be suitable for all steel grades.And add
Enter the synthetic slag generally matched i.e. quick lime and add part deoxidier, still due to the composition without fundamentally changing slag system, institute
Heat insulation effect can only be played, slag fusing point can not be reduced.
Invention content
The purpose of the present invention is to provide modification agent and application method that a kind of converter is followed by the anti-slag crust of RH vacuum, solutions
The problem of top slag of ladle of having determined carries out steel slag modification in converter tapping to RH vacuum refining process.
A kind of converter is followed by the modification agent of the anti-slag crust of RH vacuum, including bauxite, fluorite and quick lime, specific to match
Parameter is as follows：Its mass percent is bauxite content 60~100%, quick lime content：0~25%, fluorite content：0~
25%；Chemical component weight percentage is CaO：0~25%, MgO：0~5%, SiO2：2~12%, Al2O3：40~90%,
CaF2：0~25%, surplus is inevitable impurity；
The granularity of modification agent is 5~30mm, and quantity of the granularity less than 5mm is no more than the 10% of weight.
A kind of converter is followed by the application method for the modification agent that the anti-slag of RH vacuum crusts, and specific steps and parameter is as follows：
1, modification agent is configured first, and raw material are bauxite content 60~100%, quick lime content by mass percentage：
0~25%, fluorite content：0~25%；The modification agent chemical component weight percentage prepared is CaO：0~25%, MgO：0~
5%, SiO2：2~12%, Al2O3：40~90%, CaF2：0~25%, surplus is inevitable impurity；
2, modification agent is added, is added in Ladle Bottom, tapping process to be added with steel stream before tapping and then taps or tap
After be added to the top of the slag and carry out Bottom Argon Stirring, modification agent addition is 3~8kg/t steel.The molten of slag can effectively be made in this way
Point reduces, and plays the role of heat preservation, prevents from crusting.
The advantage of the invention is that：The modification agent of addition can be such that slag is formed with early conducive to desulfurization and Adsorption field trash
And to the slag system that field trash is denaturalized, it can prevent the slag in RH processing procedures from crusting, or be not easy to melt after crust, separately
Outer such modification agent is at low cost, is simple to manufacture, effect is good.
Specific implementation mode
Embodiment 1
Certain steel grade is smelted, configures modification agent first, raw material quality percentage is bauxite content 80%, and quick lime contains
Amount：0%, fluorite content：20%.
Before converter tapping, modification agent is added in Ladle Bottom, addition is 5kg/t steel, modification agent main chemical compositions weight
Percentage is：SiO2：8%, Al2O3：60%, CaF2：17%, surplus is inevitable impurity.Quantity of slag 11kg/t under converter
Steel.
1 each slag charge main component mass percent of table, %
| CaO | SiO2 | MgO | Al2O3 | CaF2 | FeO | |
| Slag charge modification agent main component is added | - | 8 | - | 60 | 17 | - |
| Converter terminal slag main component | 49 | 10 | 9 | - | - | 23 |
| RH enters the station slag main component | 34 | 10 | 6 | 19 | 5 | 16 |
From CaO-SiO3-Al2O3Slag fusing point known to ternary phase diagrams is down to 1500 DEG C or so by 2300 DEG C or so.Follow-up
RH refining in do not occur encrustation phenomena.
Embodiment 2
Certain steel grade is smelted, configures modification agent first, raw material quality percentage is bauxite content 80%, and quick lime contains
Amount：0%, fluorite content：10%.
Modification agent is added with steel stream in converter tapping process, and addition is 6kg/t steel, modification agent main chemical compositions weight hundred
Point ratio is：CaO：14%, SiO2：8%, MgO:2%, Al2O3：50%, CaF2：14%, surplus is inevitable impurity.Turn
The quantity of slag about 10kg/t steel under stove.
2 each slag charge main component mass percent of table, %
| CaO | SiO2 | MgO | Al2O3 | CaF2 | FeO | |
| Slag charge modification agent ingredient is added | 14 | 5 | 2 | 50 | 14 | - |
| Converter terminal slag main component | 46 | 11 | 10 | - | - | 28 |
| RH refines the slag ingredient that enters the station | 34 | 10 | 7 | 19 | 5 | 18 |
From CaO-SiO3-Al2O3Slag fusing point known to ternary phase diagrams is down to 1550 DEG C or so by 2300 DEG C or so.Follow-up
RH refinings in slag there is slight encrustation phenomena, but melted by bottom blowing gas agitating.
Claims (4)
1. a kind of converter is followed by the modification agent of RH vacuum anti-slag crust, which is characterized in that chemical component weight percentage is
CaO：0~25%, MgO：0~5%, SiO2：2~12%, Al2O3：40~90%, CaF2：0~25%, surplus is inevitable
Impurity.
2. modification agent according to claim 1, which is characterized in that the granularity is 5~30mm, and granularity is less than 5mm's
Quantity is no more than the 10% of weight.
3. a kind of application method of modification agent described in claim 1, which is characterized in that specific steps and parameter is as follows：
1) modification agent, chemical component weight percentage CaO are configured first：0~25%, MgO：0~5%, SiO2：2~
12%, Al2O3：40~90%, CaF2：0~25%, surplus is inevitable impurity；Granularity is 5~30mm, and granularity is less than
The quantity of 5mm is no more than the 10% of weight；
2) three kinds of modes of modification agent are added：Be added to before tapping in Ladle Bottom, tapping process with steel stream be added then tap or
It is added to the top of the slag after tapping and carries out Bottom Argon Stirring, addition is 3~8kg/t steel, can effectively make the fusing point of slag in this way
It reduces, and plays the role of heat preservation, prevent from crusting.
4. modification agent according to claim 1, which is characterized in that the chemical composition granularity is 5~30mm, and granularity is small
It is no more than the 10% of weight in the quantity of 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810176738.1A CN108384917A (en) | 2018-03-03 | 2018-03-03 | A kind of converter is followed by the modification agent and application method of the anti-slag crust of RH vacuum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810176738.1A CN108384917A (en) | 2018-03-03 | 2018-03-03 | A kind of converter is followed by the modification agent and application method of the anti-slag crust of RH vacuum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108384917A true CN108384917A (en) | 2018-08-10 |
Family
ID=63070295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810176738.1A Pending CN108384917A (en) | 2018-03-03 | 2018-03-03 | A kind of converter is followed by the modification agent and application method of the anti-slag crust of RH vacuum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108384917A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875199A (en) * | 2022-05-20 | 2022-08-09 | 山东钢铁集团日照有限公司 | Method for preventing slag caking of ultra-low carbon steel ladle top |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101481747A (en) * | 2008-12-05 | 2009-07-15 | 首钢总公司 | Final slag modifier for smelting steel in converter and use method thereof |
| CN102002550A (en) * | 2010-12-09 | 2011-04-06 | 湖南华菱湘潭钢铁有限公司 | Slag modifier for converter refining |
| CN104789734A (en) * | 2015-04-03 | 2015-07-22 | 山东钢铁股份有限公司 | Smelting method of sulfur bearing steel |
-
2018
- 2018-03-03 CN CN201810176738.1A patent/CN108384917A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101481747A (en) * | 2008-12-05 | 2009-07-15 | 首钢总公司 | Final slag modifier for smelting steel in converter and use method thereof |
| CN102002550A (en) * | 2010-12-09 | 2011-04-06 | 湖南华菱湘潭钢铁有限公司 | Slag modifier for converter refining |
| CN104789734A (en) * | 2015-04-03 | 2015-07-22 | 山东钢铁股份有限公司 | Smelting method of sulfur bearing steel |
Non-Patent Citations (1)
| Title |
|---|
| 俞海明 等: "《转炉钢水的炉外精炼技术》", 31 August 2011, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875199A (en) * | 2022-05-20 | 2022-08-09 | 山东钢铁集团日照有限公司 | Method for preventing slag caking of ultra-low carbon steel ladle top |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180810 |
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| RJ01 | Rejection of invention patent application after publication |