CN106311998A - Preparation and use method of molten steel covering agent - Google Patents
Preparation and use method of molten steel covering agent Download PDFInfo
- Publication number
- CN106311998A CN106311998A CN201510368711.9A CN201510368711A CN106311998A CN 106311998 A CN106311998 A CN 106311998A CN 201510368711 A CN201510368711 A CN 201510368711A CN 106311998 A CN106311998 A CN 106311998A
- Authority
- CN
- China
- Prior art keywords
- molten steel
- coverture
- covering agent
- mixing
- preparation
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 5
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims abstract description 5
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 5
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 5
- 238000010079 rubber tapping Methods 0.000 claims abstract description 4
- 229910017976 MgO 4 Inorganic materials 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 claims description 4
- 235000021050 feed intake Nutrition 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000000643 oven drying Methods 0.000 claims description 4
- 239000012798 spherical particle Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 abstract description 8
- 239000001301 oxygen Substances 0.000 abstract description 8
- 238000005266 casting Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract 2
- 230000008018 melting Effects 0.000 abstract 2
- 239000002184 metal Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a preparation and use method of a molten steel covering agent, which comprises the following raw material components: 5-40% of CaO and SiO226～60％，MgO 4～8％，Al2O35～11％，Fe2O33-6% of solid C0-20%％，S≤0.10％，H2O is less than or equal to 0.5 percent; the melting point is 1200-1360 ℃, and the melting speed is 70-100 s-1Volume density of 0.8 +/-0.2 g/cm3(ii) a Mixing the raw materials in a mixer for 1-3 h, uniformly mixing, and then performing low-temperature drying treatment under the nitrogen protection atmosphere, wherein the drying temperature is 50-70 ℃, and the drying time is 1-4 h. And directly adding the covering agent to the surface of molten steel in a molten steel tank after tapping, or directly adding the covering agent to the surface of molten steel in a continuous casting tundish, wherein the adding amount is 0.7-1 kg per ton of steel. The invention can obviously reduce oxygen and nitrogen in molten steel, thereby reducing the inclusion defect of the casting blank and improving the quality of the casting blank; meanwhile, dust pollution is effectively reduced, and the field operation environment is improved.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, be used for making steel in the middle of ladle or continuous casting particularly to one
Molten steel covering agent in bag.
Background technology
In steel-making, casting process, needing molten steel surface in ladle, tundish to add coverture, it is made
With being protection molten steel not ingress of air, cause with the oxygen entrance molten steel in air-prevention and be mingled with；And molten steel is risen
To insulation effect, with satisfied steel-making, the continuous casting steel needs to pouring temperature.It addition, utilize coverture to inhale
Being mingled with in attached molten steel.
But at present in steel-making, casting process, still suffer from following problem:
1, bale slag-blanking detection device fails, causes big Baogang slag to enter in Metal in Tundish, causes steel
Water oxygen supplement (in big cinder inclusion, oxygen amount is high).
2, in casting process, often occur molding casting bad, cause air to enter in Metal in Tundish,
Oxygen dissolves in molten steel formation and is mingled with, and the oxygen in molten steel can not be adsorbed by the tundish covering flux of routine.
3, coverture dust is big, pollutes environment, melts uniformity poor in ladle simultaneously.
At present, the ladle carried out both at home and abroad, the research of tundish covering flux, main thought is to improve to cover
The basicity of agent, to increase the ability that its absorption is mingled with, such as covering agent for pouring basket in high alkalinity.These achievements in research
Although being mingled with in molten steel can be absorbed to a certain extent, but due to next real to improve the way of coverture basicity
Now absorb and be mingled with, therefore crust when easily causing coverture viscosity to increase, use, cause Metal in Tundish and cover
Lid agent separates and enters air.Smelting high-quality, the requirement of clean steel can not be met.Ladle covering agent
The most gradually develop to multi-functional, high efficiency direction, in order to reach molten steel preferably protective effect.
Summary of the invention
It is desirable to provide a kind of oxygen reduced in molten steel and nitrogen, reduce strand inclusion defect, improve casting
Base quality, improves the preparation using method of the molten steel covering agent of operating environment.
To this end, the technical solution that the present invention is taked is:
A kind of preparation using method of molten steel covering agent, it is characterised in that:
(1) feed intake:
Coverture material composition weight percent content is: CaO 5～40%, SiO226～60%, MgO 4～
8%, Al2O35～11%, Fe2O33～6%, solid C 0～20%, S≤0.10%, H2O≤0.5%；
The fusing point of described coverture is 1200～1360 DEG C, and molten speed is 70～100s-1, bulk density is 0.8
±0.2g/cm3；
(2) batch mixing:
Raw material is sufficiently mixed in blender, mixing time 1～3h；
(3) dry:
Compound after mixing carries out oven drying at low temperature process under nitrogen protection atmosphere, dries temperature 50～70 DEG C,
Drying time 1～4h, prepares the spherical particle coverture of granularity≤1.0mm；
(4) use:
Coverture is directly added into after tapping the molten steel surface in ladle, or is directly added in the middle of continuous casting
Molten steel surface in bag, addition is 0.7～1kg/ ton steel.
The invention have the benefit that
The present invention can significantly reduce the oxygen in molten steel and nitrogen, thus reduces the inclusion defect of strand, improves strand
Quality；Meanwhile, effectively reduce dust pollution, improve on-the-spot operating environment.
Detailed description of the invention
Embodiment 1:
1, feed intake:
Coverture material composition weight percent content is: CaO 20%, SiO250%, MgO 6%, Al2O37%,
Fe2O34%, solid C 12.5%, S0.10%, H2O 0.4%.
The fusing point of described coverture is 1280 DEG C, and molten speed is 83s-1, bulk density is 0.85g/cm3。
(2, batch mixing:
Raw material is sufficiently mixed in blender, mixing time 2h.
3, dry:
Compound after mixing carries out oven drying at low temperature process under nitrogen protection atmosphere, dries temperature 58 DEG C, dries
Dry time 3.5h, prepares the spherical particle coverture of granularity≤1.0mm.
4, use:
Coverture is directly added into after tapping the molten steel surface in ladle, and addition is 0.9kg/ ton steel.
Embodiment 2:
1, feed intake:
Coverture material composition weight percent content is: CaO 32%, SiO235%, MgO 7%, Al2O310%,
Fe2O35%, solid C 10.6%, S0.08%, H2O 0.32%.
The fusing point of coverture is 1330 DEG C, and molten speed is 90s-1, bulk density is 0.79g/cm3。
2, batch mixing:
Raw material is sufficiently mixed in blender, mixing time 1.6h；
3, dry:
Compound after mixing carries out oven drying at low temperature process under nitrogen protection atmosphere, dries temperature 65 DEG C, dries
Dry time 2.5h, prepares the spherical particle coverture of granularity≤1.0mm.
4, use:
The molten steel surface being directly added in continuous casting production by coverture, addition is 0.8kg/ ton steel.
Claims (1)
1. the preparation using method of a molten steel covering agent, it is characterised in that:
(1) feed intake:
Coverture material composition weight percent content is: CaO 5～40%, SiO226～60%, MgO 4～
8%, Al2O35～11%, Fe2O33～6%, solid C 0～20%, S≤0.10%, H2O≤0.5%；
The fusing point of described coverture is 1200～1360 DEG C, and molten speed is 70～100s-1, bulk density is 0.8
±0.2g/cm3；
(2) batch mixing:
Raw material is sufficiently mixed in blender, mixing time 1～3h；
(3) dry:
Compound after mixing carries out oven drying at low temperature process under nitrogen protection atmosphere, dries temperature 50～70 DEG C,
Drying time 1～4h, prepares the spherical particle coverture of granularity≤1.0mm；
(4) use:
Coverture is directly added into after tapping the molten steel surface in ladle, or is directly added in the middle of continuous casting
Molten steel surface in bag, addition is 0.7～1kg/ ton steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510368711.9A CN106311998A (en) | 2015-06-26 | 2015-06-26 | Preparation and use method of molten steel covering agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510368711.9A CN106311998A (en) | 2015-06-26 | 2015-06-26 | Preparation and use method of molten steel covering agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106311998A true CN106311998A (en) | 2017-01-11 |
Family
ID=57723076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510368711.9A Pending CN106311998A (en) | 2015-06-26 | 2015-06-26 | Preparation and use method of molten steel covering agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106311998A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107685140A (en) * | 2017-09-08 | 2018-02-13 | 河钢股份有限公司承德分公司 | A kind of method for reducing tundish covering flux consumption |
| CN112126739A (en) * | 2020-09-10 | 2020-12-25 | 山东钢铁集团日照有限公司 | Method for pressing smoke in ladle |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04224063A (en) * | 1990-12-21 | 1992-08-13 | Sumitomo Metal Ind Ltd | Mold powder for continuous casting |
| US5366535A (en) * | 1992-12-07 | 1994-11-22 | Premier Services Corporation | Basic tundish covering compound |
| CN101530896A (en) * | 2008-03-14 | 2009-09-16 | 宝山钢铁股份有限公司 | High casting speed continuous casting covering slag used for ultra-low-carbon steel |
| CN102059329A (en) * | 2009-11-11 | 2011-05-18 | 杨忠鑫 | Tundish covering agent |
| CN103008590A (en) * | 2012-12-08 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Continuous casting mold covering slag for medium carbon steel containing manganese |
| CN103223477A (en) * | 2013-05-14 | 2013-07-31 | 内蒙古包钢钢联股份有限公司 | Continuous casting crystallizer covering slag for high-carbon steel |
| CN103273028A (en) * | 2013-06-11 | 2013-09-04 | 鞍钢股份有限公司 | Tundish covering agent and preparation and use method thereof |
| CN104399921A (en) * | 2014-11-13 | 2015-03-11 | 北京首钢股份有限公司 | Casting powder |
-
2015
- 2015-06-26 CN CN201510368711.9A patent/CN106311998A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04224063A (en) * | 1990-12-21 | 1992-08-13 | Sumitomo Metal Ind Ltd | Mold powder for continuous casting |
| US5366535A (en) * | 1992-12-07 | 1994-11-22 | Premier Services Corporation | Basic tundish covering compound |
| CN101530896A (en) * | 2008-03-14 | 2009-09-16 | 宝山钢铁股份有限公司 | High casting speed continuous casting covering slag used for ultra-low-carbon steel |
| CN102059329A (en) * | 2009-11-11 | 2011-05-18 | 杨忠鑫 | Tundish covering agent |
| CN103008590A (en) * | 2012-12-08 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Continuous casting mold covering slag for medium carbon steel containing manganese |
| CN103223477A (en) * | 2013-05-14 | 2013-07-31 | 内蒙古包钢钢联股份有限公司 | Continuous casting crystallizer covering slag for high-carbon steel |
| CN103273028A (en) * | 2013-06-11 | 2013-09-04 | 鞍钢股份有限公司 | Tundish covering agent and preparation and use method thereof |
| CN104399921A (en) * | 2014-11-13 | 2015-03-11 | 北京首钢股份有限公司 | Casting powder |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107685140A (en) * | 2017-09-08 | 2018-02-13 | 河钢股份有限公司承德分公司 | A kind of method for reducing tundish covering flux consumption |
| CN112126739A (en) * | 2020-09-10 | 2020-12-25 | 山东钢铁集团日照有限公司 | Method for pressing smoke in ladle |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170111 |