CN106583673B - A kind of continuous casting covering slag and preparation method thereof reducing bonding steel leakage - Google Patents
A kind of continuous casting covering slag and preparation method thereof reducing bonding steel leakage Download PDFInfo
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- CN106583673B CN106583673B CN201611167741.4A CN201611167741A CN106583673B CN 106583673 B CN106583673 B CN 106583673B CN 201611167741 A CN201611167741 A CN 201611167741A CN 106583673 B CN106583673 B CN 106583673B
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- bonding steel
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- 239000002893 slag Substances 0.000 title claims abstract description 103
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 238000009749 continuous casting Methods 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000126 substance Substances 0.000 claims abstract description 35
- 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 22
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 22
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 19
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 19
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 19
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 19
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 15
- 230000009977 dual effect Effects 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims description 43
- 239000002002 slurry Substances 0.000 claims description 32
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 22
- 239000003575 carbonaceous material Substances 0.000 claims description 22
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 19
- 238000005469 granulation Methods 0.000 claims description 18
- 230000003179 granulation Effects 0.000 claims description 18
- 239000003595 mist Substances 0.000 claims description 18
- 239000006229 carbon black Substances 0.000 claims description 17
- 229910002804 graphite Inorganic materials 0.000 claims description 17
- 239000010439 graphite Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 13
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 12
- 239000010436 fluorite Substances 0.000 claims description 12
- 235000017550 sodium carbonate Nutrition 0.000 claims description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 11
- 235000013024 sodium fluoride Nutrition 0.000 claims description 11
- 239000011775 sodium fluoride Substances 0.000 claims description 11
- 239000000440 bentonite Substances 0.000 claims description 10
- 229910000278 bentonite Inorganic materials 0.000 claims description 10
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 10
- 239000010453 quartz Substances 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000004806 packaging method and process Methods 0.000 claims description 8
- 229910001570 bauxite Inorganic materials 0.000 claims description 7
- 230000036961 partial effect Effects 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- 235000019738 Limestone Nutrition 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims 1
- 239000006028 limestone Substances 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- 239000003818 cinder Substances 0.000 abstract description 11
- 238000005461 lubrication Methods 0.000 abstract description 11
- 230000002829 reductive effect Effects 0.000 abstract description 7
- 239000000047 product Substances 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 12
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 9
- 239000004615 ingredient Substances 0.000 description 9
- 239000010456 wollastonite Substances 0.000 description 9
- 229910052882 wollastonite Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000009790 rate-determining step (RDS) Methods 0.000 description 6
- 239000000470 constituent Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 229940037003 alum Drugs 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- LLQHSBBZNDXTIV-UHFFFAOYSA-N 6-[5-[[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]methyl]-4,5-dihydro-1,2-oxazol-3-yl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC1CC(=NO1)C1=CC2=C(NC(O2)=O)C=C1 LLQHSBBZNDXTIV-UHFFFAOYSA-N 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052661 anorthite Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000006105 batch ingredient Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- -1 by weight percentage Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- GWWPLLOVYSCJIO-UHFFFAOYSA-N dialuminum;calcium;disilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] GWWPLLOVYSCJIO-UHFFFAOYSA-N 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of continuous casting covering slag and preparation method thereof for reducing bonding steel leakage, the chemical component of the continuous casting covering slag for reducing bonding steel leakage are as follows: SiO2: 32.5-35.5%, CaO:29.5-31.5%, MgO:1.5-3.0%, Al2O3: 2.2-3.0%, Fe2O3: 0.5-1.5%, Na2O:11.0-13.0%, F‑: 10.0-12.0%, C are solid: 3.0-4.0%, and surplus is inevitable impurity, and dual alkalinity: 0.87-0.93, fusing point: viscosity is 0.115-0.135 Pa.S at 1050-1070 DEG C, 1300 DEG C.In practical applications, crystallizer flame is uniform, and spreadability is preferable for the covering slag, no conglomeration caking phenomenon, and melt cinder is stablized, and lubrication sufficiently, can make bonding steel leakage rate be reduced to 5% or less from original 10-20%.
Description
Technical field
The present invention relates to continuous casting manufacturing technique technical fields, more particularly, to a kind of continuous casting covering slag for reducing bonding steel leakage
And preparation method thereof.
Background technique
In continuous casting process, high-temperature molten steel passes through long nozzle first and flows into tundish from ladle, then passes through submersed nozzle
Enter crystallizer from intermediate packet stream.In crystallizer, due to the heat transfer of molten steel and copper plate of crystallizer, solidification of molten steel is at certain thickness
Green shell, then under mold oscillation and throwing effect, this green shell can continuously be drawn out crystallizer, into secondary cooling zone；Such as
Fruit liquid fluctuating is excessive or covering slag flow into it is uneven etc. lead to poor lubrication between green shell and crystallizer, it is existing that bonding will occur
As.Especially in high draw speed plate blank continuous casting, wide thickness plate continuous casting and sheet blank continuous casting, since initial solidification shell grows uniformity and guarantor
Shield slag flows into stability and is remarkably decreased, and green shell is easy to bond with copper plate of crystallizer.After green shell bonds, if not having
Removing measure is timely taken, then green shell can constantly be torn and solidify again under mold oscillation and throwing effect,
Breach is caused continuously to move down, there have been bleed-outs when reaching crystallizer outlet, and it to be continuous casting process that here it is bonding steel leakages
In main bleed-out form.
The influence factor of bonding steel leakage has very much, wherein mainly having covering slag, molten steel condition, pouring operation, apparatus factor
Deng.Covering slag melts bad in a crystallizer, and forming slag item on the upside of crystallizer wall keeps melt cinder insufficient, hinders or reduce melting
The covering slag of state also will appear the molten slag layer tomography at meniscus, cause to tie when larger fluctuation occurs in molten steel face in crystallizer
Slag film is broken between brilliant device and green shell, is lubricated bad；When molten steel cleanliness is not high, as covering slag absorbs a large amount of A12O3Equal deoxidations
After product or resistance to material, increase its viscosity, covering slag consumption reduces, and causes melt cinder to flow into deficiency etc., to influence covering slag
Lubricant effect；When covering slag cannot form slag film on crystallizer wall, lubrication state deteriorates, the green shell solidified on crystallizer wall
It is torn by frictional force, then the solidification of molten steel that is supplemented in breach, healing are torn again, go down repeatedly, this is weak
After going out crystallizer at green shell, bonding steel leakage occurs for the static pressure due to cannot withstand molten steel.Therefore continuous casting covering slag is to influence leakage
The principal element of steel, and bleed-out has seriously affected the direct motion of continuous casting, and can damage continuous casting machine, causes huge warp
Ji loss, therefore by being improved to covering slag, and then reduce bonding steel leakage have in meaning.
Chinese Patent Application No. 200810201555.7 discloses a kind of anti-bonding bleed-out continuous casting covering slag, and ingredient is by weight
Measure percentages are as follows: Al2O3: 2%~8%, F:2%~7%, Na2O:4%~8%, Li2O: < 4%, B2O3: 2%~15%,
C:0.7%~3%, the impurity that raw material is brought into: < 3%, remaining is CaO and SiO2, wherein CaO/SiO2(weight ratio) be 0.5~
0.8.The mold flux property is as follows: setting temperature < 980 DEG C, is 0.2~0.5Pa.s, process of setting in 1300 DEG C of viscosity
It does not precipitate crystal.The covering slag viscosity is bigger than normal, influences the mobility of slag, covering slag bonding probability is bigger, to cause to leak
The probability of steel is bigger.
Chinese Patent Application No. 201310540920.8 discloses a kind of automobile plate continuous casting ultra-low-carbon steel, mild steel crystallization
Device covering slag, by weight percentage, chemical composition are as follows: 27% < CaO < 33%, 30% < SiO2< 36 %, 7% < Al2O3+
MgO < 14 %, Fe2O3< 3%, 3% < F-< 8%, 7% < R2O < 12%, 0.5% < C < 3%, surplus are impurity, the R2O is alkali
Metal oxide, basicity 0.75-1.1, the covering slag of invention preparation are the surfaces in order to improve slab lubrication, improve slab
Quality, and viscosity is bigger than normal, is not suitable for improving bonding steel leakage.
Summary of the invention
In view of this, in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of continuous castings for reducing bonding steel leakage
Covering slag, in actual application, product even flame in crystallizer, spreadability is preferable for the continuous casting covering slag, no conglomeration knot
Block phenomenon, melt cinder are stablized, and lubrication sufficiently, can make bonding steel leakage rate be reduced to 5% or less from original 10-20%.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of continuous casting covering slag reducing bonding steel leakage, chemical composition comprises the following components in percentage by weight are as follows: SiO2: 32.5-
35.5%, CaO:29.5-31.5%, MgO:1.5-3.0%, Al2O32.2-3.0%, Fe2O3: 0.5-1.5%, Na2O:11.0-13.0%,
F-: 10.0-12.0%, C are solid: 3.0-4.0%, and surplus is inevitable impurity, dual alkalinity: 0.87-0.93, fusing point: 1050-
Viscosity is 0.115-0.135 Pa.S at 1070 DEG C, 1300 DEG C.
Further, the continuous casting covering slag for reducing bonding steel leakage is prepared by following raw material by weight percentage:
Pre- melt: 20-40%, soda ash: 8-10%, fluorite: 8-11%, quartz: 5-7%, wollastonite: 24-34%, bentonite: 2-5%, aluminium alum
Soil: 0-2%, sodium fluoride: 5-8%, ice crystal: 1-2%, carbonaceous material: 2-5%, sodium cellulose glycolate: 1-3%.
Further, SiO in the pre- melt2: 33-35%, CaO:36-38%, MgO≤3.0%, Al2O3: 25-4.5%,
Fe2O3≤ 2.0%, Na2O:7.5-9.5%, F:6.0-8.0%, moisture content≤0.5%.
Further, the carbonaceous material is carbon black and/or amorphous graphite.
Further, the carbonaceous material is that carbon black and amorphous graphite are mixed by weight 0.5-2:1.
Further, each moisture content of raw material≤1.0%, raw material particle size are controlled in -320 mesh >=95%.
A kind of preparation method for the continuous casting covering slag reducing bonding steel leakage, comprising the following steps:
(1) raw material is added to water slurrying after mixing, obtains slurry；
(2) slurry is sent to granulation tower and carries out mist projection granulating, then screen out the particle that partial size is 0.15-1mm, sampling inspection
Survey chemical component, packaging into products.
Further, mixing time is 60-70min in the step (1).
Further, pulp density is 58-65% in the step (1).
Further, mist projection granulating is to send the slurry to granulation tower through plunger pump pressurization in the step (2), described
Plunger pump pressure is 0.8-1.5MPa, and defeated slurry speed is 20-25L/min, and spray gun sprays the aperture of piece when the mist projection granulating
2.0mm, the granulation tower tower temperature are 650-700 DEG C.
The beneficial effects of the present invention are:
1, the present invention is to reduce the bonding steel leakage in continuous casting process, chemical component and raw material to continuous casting covering slag into
Row improves, and the basicity of covering slag is adjusted by control raw material and viscosity, by improving the type with carbon controls burn-off rate,
To reduce bonding, bonding steel leakage rate is reduced；The product of preparation in actual application, product even flame in crystallizer,
Spreadability is preferable, and without a caking phenomenon, melt cinder is stablized, and lubrication sufficiently, can make bonding steel leakage rate be reduced to 5% or less from 10-20%.
2, the basicity of covering slag is to embody an important indicator of covering slag crystallization rate, heat transfer, lubrication and dross inclusion adsorption,
Basicity is higher, and crystallization rate is higher, and the high-melting-point crystalline state thermal resistance of precipitation is big, can effectively slow down heat transfer, give birth to green shell uniformly
At the cracked probability of the stronger steel grade of crack sensitivity can be effectively reduced, but the high thermal resistance of basicity is big, out the base of crystallizer
Shell is thin, and the crystalline state of precipitation is in particle porous shape, and is degrading lubrication, increases resistance of billet withdrawal, increases the generation of bonding accident, this
Invention improves the vitrifying tendency of slag film, reduces to improve greasy property of the covering slag between crystallizer and solidified shell
Probability is bonded, by the basicity control of the product of preparation in 0.87-0.93, i.e. control covering slag has lower basicity, to improve profit
Sliding effect, while the generating rate of mold liquid level slag item is reduced, avoid bonding accident from occurring.
3, improvement thawing phenomenon coexists using a variety of flux in the present invention, and a variety of flux such as sodium fluoride and ice crystal coexist, can
The usage amount of soda ash and fluorite is reduced, so as to improve the fusing distance of each batch ingredients, reduces point molten tendency to reduce covering slag
Sintering trend reduces the generation of slag slag circle.To make covering slag melt in crystallizer uniformly, melt cinder is stablized, the distribution of slag film
Uniformly, guarantee that initial solidification shell generates uniformly.
4, suitable viscosity number can guarantee that covering slag slag smoothly inserts channel between crystallizer and slab, guarantees slag film thickness
The key of slab is spent, guarantees reasonable heat transfer rate and lubricates, and lower viscosity can improve the mobility of slag, increase slag
Consumption improves lubrication, to adapt to high pulling rate needs, equally achievees the purpose that reduce bonding probability.Therefore the present invention passes through in raw material
Fluorite adjust the viscosity of covering slag, control covering slag has low viscosity, that is, 0.115-0.135 Pa.S, to reduce aluminium alum
The usage amount of soil, Al2O3The fusing point of covering slag can be made to increase, be easy when too high levels to generate anorthite, excessively high Al2O3Can also
Increase the viscosity of covering slag, is unfavorable for absorption and is mingled with.Melt cinder pouring volume can be improved in the range of viscosities, improves lubrication, makes slag
Film thickness and heat transfer uniformly, reduce bonding probability.
5, in addition the present invention also matches carbon using compound, i.e. amorphous graphite and carbon black is used in compounding, to control the molten of covering slag
Change speed, to reduce bonding steel leakage.The burn-off rate of covering slag determines the melt cinder thickness formed on Mold face
Degree and slag consumption.If burn-off rate is too fast, slag layer is not easy to keep, and increases heat loss, and melt cinder face is easily crusted, and may cause
Slag inclusion；The liquid slag layer that burn-off rate is formed slowly excessively is excessively thin, and too fast excessively slow burn-off rate all be easy to cause the became uneven of slag film,
Casting billet surface is set to generate lobe or bonding steel leakage.To control suitable burn-off rate, continuous casting covering slag should have multilayered structure, i.e.,
Slag layer, sinter layer, half crucible zone and molten slag layer, half crucible zone should have enough thickness, constantly to provide melt cinder to molten slag layer, when
Molten slag layer remains to maintain enough thickness when pulling rate changes.Therefore the present invention uses the compound method with carbon, the dispersion degree of carbon black
Larger, ignition point is lower, can give full play to the effect of isolation base-material particle at a lower temperature, graphite ignition point is higher, in height
Lower temperature is more suitable for that can efficiently control the melting characteristic of covering slag using the compound method with carbon, make it as skeleton particle
More stable melting characteristic is kept within the scope of relatively wide temperature, to meet the needs of high casting speed continuous casting.
Specific embodiment
The invention will be further described combined with specific embodiments below, each pre- melt used in the examples of the present invention
The content of middle main chemical compositions is respectively SiO2: 33-35%, CaO:36-38%, MgO≤3.0%, Al2O3: 2.5-4.5%, Fe2O3
≤ 2.0%, Na2O:7.5-9.5%, F:6.0-8.0%, moisture content≤0.5%.
Embodiment 1
A kind of preparation method for the continuous casting covering slag reducing bonding steel leakage, comprising the following steps:
(1) ingredient: the continuous casting covering slag for reducing bonding steel leakage is prepared by following raw material by weight percentage: pre-
Melt: 20%, soda ash: 10%, fluorite: 11%, quartz: 7%, wollastonite: 34%, bentonite: 2%, bauxite: 2%, sodium fluoride: 8%,
Ice crystal: 2%, carbonaceous material: 3%, sodium cellulose glycolate: 1%, wherein carbonaceous material includes amorphous graphite 2% and carbon black 1%；
(2) raw material is added to water slurrying after mixing, mixing time 60min obtains slurry, and the concentration of slurry is 58%；
(3) slurry is sent through plunger pump pressurization to granulation tower and carries out mist projection granulating, wherein plunger pump pressure is 0.8MPa, defeated
Slurry speed is 20L/min, and the aperture 2.0mm of spray gun spray piece, granulation tower tower temperature are 650 DEG C when mist projection granulating, then screens out grain
Diameter is the particle of 0.15-1mm, sample detection chemical component, packaging into products.
Wherein each moisture content of raw material≤1.0% in rate-determining steps (1), raw material particle size are controlled in -320 mesh >=95%, i.e. grain
320 purposes that diameter is less than account for the 95% of raw material weight.
Chemical composition comprises the following components in percentage by weight in product through detection preparation are as follows: SiO2: 32.9%, CaO:29.8%, MgO:
2.2%, Al2O3: 3.0%, Fe2O3: 0.5%, Na2O:13.0%, F-: 11.8%, C are solid: 3.8%, surplus be inevitable impurity, two
First basicity: 0.91, fusing point: viscosity is 0.115Pa.S at 1050 DEG C, 1300 DEG C.
Embodiment 2
A kind of preparation method for the continuous casting covering slag reducing bonding steel leakage, comprising the following steps:
(1) ingredient: the continuous casting covering slag for reducing bonding steel leakage is prepared by following raw material by weight percentage: pre-
Melt: 40%, soda ash: 8%, fluorite: 8%, quartz: 5%, wollastonite: 24%, bentonite: 5%, sodium fluoride: 5%, ice crystal: 1%, carbon
Material: 2%, sodium cellulose glycolate: 2%, it wherein include amorphous graphite 1% and carbon black 1% in carbonaceous material；
(2) raw material is added to water slurrying after mixing, mixing time 65min obtains slurry, and the concentration of slurry is 60%；
(3) slurry is sent through plunger pump pressurization to granulation tower and carries out mist projection granulating, wherein plunger pump pressure is 1.0MPa, defeated
Slurry speed is 21L/min, and the aperture 2.0mm of spray gun spray piece, granulation tower tower temperature are 660 DEG C when mist projection granulating, then screens out grain
Diameter is the particle of 0.15-1mm, sample detection chemical component, packaging into products.
Wherein each moisture content of raw material≤1.0% in rate-determining steps (1), raw material particle size are controlled in -320 mesh >=95%, i.e. grain
320 purposes that diameter is less than account for the 95% of raw material weight.
Chemical composition comprises the following components in percentage by weight in product through detection preparation are as follows: SiO2: 34.5%, CaO:31%, MgO:
2.5%, Al2O3: 2.2%, Fe2O3: 1.5%, Na2O:12.5%, F-: 10.2%, C are solid: 3.8%, surplus be inevitable impurity, two
First basicity: 0.90, fusing point: viscosity is 0.135 Pa.S at 1070 DEG C, 1300 DEG C.
Embodiment 3
A kind of preparation method for the continuous casting covering slag reducing bonding steel leakage, comprising the following steps:
(1) ingredient: the continuous casting covering slag for reducing bonding steel leakage is prepared by following raw material by weight percentage: pre-
Melt: 29%, soda ash: 9%, fluorite: 9%, quartz: 6%, wollastonite: 26%, bentonite: 3%, bauxite: 2%, sodium fluoride: 7%, ice
Spar: 2%, carbonaceous material: 4%, sodium cellulose glycolate: 3%, wherein carbonaceous material includes amorphous graphite 2% and carbon black 2%；
(2) raw material is added to water slurrying after mixing, mixing time 70min obtains slurry, and the concentration of slurry is 62%；
(3) slurry is sent through plunger pump pressurization to granulation tower and carries out mist projection granulating, wherein plunger pump pressure is 1.2MPa, defeated
Slurry speed is 22L/min, and the aperture 2.0mm of spray gun spray piece, granulation tower tower temperature are 670 DEG C when mist projection granulating, then screens out grain
Diameter is the particle of 0.15-1mm, sample detection chemical component, packaging into products.
Wherein each moisture content of raw material≤1.0% in rate-determining steps (1), raw material particle size are controlled in -320 mesh >=95%, i.e. grain
320 purposes that diameter is less than account for the 95% of raw material weight.
Chemical composition comprises the following components in percentage by weight in product through detection preparation are as follows: SiO2: 35.5%, CaO:31.5%, MgO:
2.8%, Al2O3: 2.8%, Fe2O3: 0.8%, Na2O:11.0%, F-: 10.6%, C are solid: 3.0%, surplus be inevitable impurity, two
First basicity: 0.89, fusing point: viscosity is 0.125Pa.S at 1060 DEG C, 1300 DEG C.
Embodiment 4
A kind of preparation method for the continuous casting covering slag reducing bonding steel leakage, comprising the following steps:
(1) ingredient: the continuous casting covering slag for reducing bonding steel leakage is prepared by following raw material by weight percentage: pre-
Melt: 30%, soda ash: 8%, fluorite: 10%, quartz: 5%, wollastonite: 28%, bentonite: 4%, bauxite: 1%, sodium fluoride: 6%, ice
Spar 1.5%, carbonaceous material: 3.5%, sodium cellulose glycolate: 3%, wherein carbonaceous material includes amorphous graphite 1.5% and carbon black
2%；
(2) raw material is added to water slurrying after mixing, mixing time 60min obtains slurry, and the concentration of slurry is 60%；
(3) slurry is sent through plunger pump pressurization to granulation tower and carries out mist projection granulating, wherein plunger pump pressure is 1.2MPa, defeated
Slurry speed is 23L/min, and the aperture 2.0mm of spray gun spray piece, granulation tower tower temperature are 680 DEG C when mist projection granulating, then screens out grain
Diameter is the particle of 0.15-1mm, sample detection chemical component, packaging into products.
Wherein each moisture content of raw material≤1.0% in rate-determining steps (1), raw material particle size are controlled in -320 mesh >=95%, i.e. grain
320 purposes that diameter is less than account for the 95% of raw material weight.
Chemical composition comprises the following components in percentage by weight in product through detection preparation are as follows: SiO2: 33.5%, CaO:30.8%, MgO:
1.9%, Al2O3: 2.7%, Fe2O3: 1.5%, Na2O:12.4%, F-: 10.8%, C are solid: 3.5%, surplus be inevitable impurity, two
First basicity: 0.92, fusing point: viscosity is 0.116Pa.S at 1065 DEG C, 1300 DEG C.
Embodiment 5
A kind of preparation method for the continuous casting covering slag reducing bonding steel leakage, comprising the following steps:
(1) ingredient: the continuous casting covering slag for reducing bonding steel leakage is prepared by following raw material by weight percentage: pre-
Melt: 35%, soda ash: 8%, fluorite: 8%, quartz: 6%, wollastonite: 30%, bentonite: 2%, sodium fluoride: 5%, ice crystal: 1%, carbon
Material: 3%, sodium cellulose glycolate: 2%, wherein carbonaceous material includes amorphous graphite 1% and carbon black 2%；
(2) raw material is added to water slurrying after mixing, mixing time 65min obtains slurry, and the concentration of slurry is 65%；
(3) slurry is sent through plunger pump pressurization to granulation tower and carries out mist projection granulating, wherein plunger pump pressure is 1.5MPa, defeated
Slurry speed is 24L/min, and the aperture 2.0mm of spray gun spray piece, granulation tower tower temperature are 690 DEG C when mist projection granulating, then screens out grain
Diameter is the particle of 0.15-1mm, sample detection chemical component, packaging into products.
Wherein each moisture content of raw material≤1.0% in rate-determining steps (1), raw material particle size are controlled in -320 mesh >=95%, i.e. grain
320 purposes that diameter is less than account for the 95% of raw material weight.
Chemical composition comprises the following components in percentage by weight in product through detection preparation are as follows: SiO2: 33.8%, CaO:29.5%, MgO:
3.0%, Al2O3: 3.0%, Fe2O3: 1.2%, Na2O:12.0%, F-: 11.5%, C are solid: 3.7%, surplus be inevitable impurity, two
First basicity: 0.87, fusing point: viscosity is 0.130 Pa.S at 1058 DEG C, 1300 DEG C.
Embodiment 6
A kind of preparation method for the continuous casting covering slag reducing bonding steel leakage, comprising the following steps:
(1) ingredient: the continuous casting covering slag for reducing bonding steel leakage is prepared by following raw material by weight percentage: pre-
Melt: 25%, soda ash: 9%, fluorite: 11%, quartz: 7%, wollastonite: 25%, bentonite: 5%, bauxite: 1%, sodium fluoride: 8%, ice
Spar: 2%, carbonaceous material: 5%, sodium cellulose glycolate: 2%, wherein carbonaceous material includes amorphous graphite 2% and carbon black 3%；
(2) raw material is added to water slurrying after mixing, mixing time 70min obtains slurry, and the concentration of slurry is 62%；
(3) slurry is sent through plunger pump pressurization to granulation tower and carries out mist projection granulating, wherein plunger pump pressure is 0.8MPa, defeated
Slurry speed is 25L/min, and the aperture 2.0mm of spray gun spray piece, granulation tower tower temperature are 700 DEG C when mist projection granulating, then screens out grain
Diameter is the particle of 0.15-1mm, sample detection chemical component, packaging into products.
Wherein each moisture content of raw material≤1.0% in rate-determining steps (1), raw material particle size are controlled in -320 mesh >=95%, i.e. grain
320 purposes that diameter is less than account for the 95% of raw material weight.
Chemical composition comprises the following components in percentage by weight in product through detection preparation are as follows: SiO2: 32.5%, CaO:30.1%, MgO:
1.5%, Al2O3: 2.6%, Fe2O3: 1.4%, Na2O:12.8%, F-: 12.0%, C are solid: 4.0%, surplus be inevitable impurity, two
First basicity: 0.93, fusing point: viscosity is 0.117Pa.S at 1070 DEG C, 1300 DEG C.
Embodiment 7
Embodiment 7 is substantially the same manner as Example 3, the difference is that: the carbonaceous material in embodiment 7 is amorphous graphite,
A kind of i.e. one preparation method for the continuous casting covering slag for reducing bonding steel leakage, comprising the following steps:
(1) ingredient: the continuous casting covering slag for reducing bonding steel leakage is prepared by following raw material by weight percentage: pre-
Melt: 29%, soda ash: 9%, fluorite: 9%, quartz: 6%, wollastonite: 26%, bentonite: 3%, bauxite: 2%, sodium fluoride 7%, ice crystal
Stone: 2%, amorphous graphite: 4%, sodium cellulose glycolate: 3%；
Other techniques are same as Example 3.
Embodiment 8
Embodiment 8 is substantially the same manner as Example 3, the difference is that: the carbonaceous material in embodiment 8 is carbon black, a kind of
Reduce the preparation method of the continuous casting covering slag of bonding steel leakage, comprising the following steps:
(1) ingredient: the continuous casting covering slag for reducing bonding steel leakage is prepared by following raw material by weight percentage: pre-
Melt: 29%, soda ash: 9%, fluorite: 9%, quartz: 6%, wollastonite: 26%, bentonite: 3%, bauxite: 2%, sodium fluoride 7%, ice crystal
Stone: 2%, carbon black: 4%, sodium cellulose glycolate: 3%；
Other techniques are same as Example 3.
Comparative example 1
The covering slag physical and chemical index of comparative example 1 is as follows: wherein chemical composition comprises the following components in percentage by weight: SiO2: 31.8%,
CaO:32.0%, MgO:3.7%, Al2O3: 2.4%, Fe2O3: 0.4%, Na2O:9.5%, F:8.6%, C are solid: 5.0%, dual alkalinity:
1.01, fusing point: 1092 DEG C, viscosity: 0.123 Pa.S.
Comparative example 2
The covering slag physical and chemical index of comparative example 2 is as follows: wherein chemical composition comprises the following components in percentage by weight: SiO2: 33.3%,
CaO:28.3%, MgO:1.8%, Al2O3: 3.8%, Fe2O3: 0.7%, Na2O:12.6%, F:9.3%, C are solid: 4.5%, dual alkalinity:
0.85, fusing point: 1090 DEG C, viscosity: 0.145 Pa.S.
Comparative example 3
Basicity is same as Example 3 in 3 covering slag physical and chemical index of comparative example, but viscosity is different, other chemical constituents are big
It causes identical: i.e. chemical composition comprises the following components in percentage by weight are as follows: SiO2: 35.5%, CaO:31.5%, MgO:2.8%, Al2O3: 1.8%,
Fe2O3: 0.8%, Na2O:11.0%, F-: 11.6%, C are solid: 3.0%, surplus be inevitable impurity, dual alkalinity: 0.89, melt
Point: viscosity is 0.110Pa.S at 1060 DEG C, 1300 DEG C.
Comparative example 4
Basicity is same as Example 3 in 4 covering slag physical and chemical index of comparative example, but viscosity is different, other chemical constituents are big
It causes identical: i.e. chemical composition comprises the following components in percentage by weight are as follows: SiO2: 35.5%, CaO:31.5%, MgO:2.8%, Al2O3: 3.0%,
Fe2O3: 0.8%, Na2O:10.0%, F-: 8.6%, C are solid: 3.0%, surplus be inevitable impurity, dual alkalinity: 0.89, melt
Point: viscosity is 0.155Pa.S at 1060 DEG C, 1300 DEG C.
Comparative example 5
5 covering slag physical and chemical index medium viscosity of comparative example is same as Example 3, but basicity is different, other chemical constituents are big
It causes identical: i.e. chemical composition comprises the following components in percentage by weight are as follows: SiO2: 31.0%, CaO:34.0%, MgO:2.8%, Al2O3: 4.2%,
Fe2O3: 0.8%, Na2O:11.0%, F-:10.0%, C are solid: 3.0%, surplus be inevitable impurity, dual alkalinity: 1.10, melt
Point: viscosity is 0.125Pa.S at 1060 DEG C, 1300 DEG C.
Comparative example 6
6 covering slag physical and chemical index medium viscosity of comparative example is same as Example 3, but basicity is different, other chemical constituents are big
It causes identical: chemical composition comprises the following components in percentage by weight are as follows: SiO2: 34.8%, CaO:31.0%, MgO:2.8%, Al2O3: 2.8%, Fe2O3:
0.8%, Na2O:11.0%, F-:10.6%, C are solid: 3.0%, surplus be inevitable impurity, dual alkalinity: 0.89, fusing point:
Viscosity is 0.125Pa.S at 1060 DEG C, 1300 DEG C.
Application test
Continuous casting covering slag in embodiment 1-8 and comparative example 1-6 is respectively applied to multiple batches of different steel grades
In continuous casting process, and sticking break-out probability is counted, test result is shown in Table 1.
1 application test result of table
As shown in Table 1, for the covering slag in comparative example 1-6 in specific application test, slag item is more, big, frequently occurs viscous
Junction leakage steel phenomenon, the sticking break-out rate for counting 50 batches is 10-20%；And the product of 1-6 of embodiment of the present invention preparation is used,
In continuous casting process, covering slag even flame in crystallizer, spreadability is preferable, no conglomeration caking phenomenon, and melt cinder is stablized, and lubrication is filled
Point, bonding steel leakage rate is below 5%.
Embodiment 7 and embodiment 8 are identical as 3 condition of embodiment, the difference is that carbonaceous material does not use amorphous graphite
It is compounded with carbon black, but only with one kind, i.e. 7 carbonaceous material of embodiment is amorphous graphite, and embodiment 8 is carbon black, but is implemented
The sticking break-out rate of example 7 and embodiment 8 is bigger than embodiment 3, illustrates that amorphous graphite and carbon black compounding can improve sticking break-out
Probability.
And product items physicochemical property is all different with embodiment 1-6 in comparative example 1-2 of the present invention, sticking break-out rate exists
15-20%.The basicity of product in comparative example 3-4 is same as Example 3, but viscosity is different, the viscosity of comparative example 5-6 product
It is same as Example 3, but basicity is different, the sticking break-out rate of comparative example 3-6 is more much higher than embodiment 3, illustrates that the present invention changes
The viscosity and basicity index of kind product are greatly improved to sticking break-out rate tool.Covering slag prepared by the present invention adapts to pulling rate
In the requirement of 1.3-1.5m/min pulling rate, significant effect.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common
Other modifications or equivalent replacement that technical staff makes technical solution of the present invention, without departing from technical solution of the present invention
Spirit and scope, be intended to be within the scope of the claims of the invention.
Claims (6)
1. it is a kind of reduce bonding steel leakage continuous casting covering slag, it is characterised in that: it is described reduce bonding steel leakage continuous casting covering slag by
Following raw material preparation by weight percentage: pre- melt: 20-40%, soda ash: 8-10%, fluorite: 8-11%, quartz: 5-7%, silicon
Lime stone: 24-34%, bentonite: 2-5%, bauxite: 0-2%, sodium fluoride: 5-8%, ice crystal 1-2%, carbonaceous material: 2-5%, hydroxyl first
Base sodium cellulosate: 1-3%, the carbonaceous material are that carbon black and amorphous graphite are mixed by weight 0.5-2:1；
The covering slag chemical composition comprises the following components in percentage by weight are as follows: SiO2: 32.5-35.5%, CaO:29.5-31.5%, MgO:1.5-
3.0%, Al2O32.2-3.0%, Fe2O3: 0.5-1.5%, Na2O:11.0-13.0%, F-: 10.0-12.0%, C are solid: 3.0-4.0%, remaining
Amount is inevitable impurity, and dual alkalinity: 0.87-0.93, fusing point: viscosity is 0.115- at 1050-1070 DEG C, 1300 DEG C
0.135 Pa.S；
SiO in the pre- melt2: 33-35%, CaO:36-38%, MgO≤3.0%, Al2O3: 2.5-4.5%, Fe2O3≤ 2.0%,
Na2O:7.5-9.5%, F:6.0-8.0%, moisture content≤0.5%；
The carbonaceous material is carbon black and/or amorphous graphite.
2. a kind of continuous casting covering slag for reducing bonding steel leakage according to claim 1, it is characterised in that: each raw water
Divide content≤1.0%, raw material particle size is controlled in -320 mesh >=95%.
3. a kind of preparation method of the continuous casting covering slag according to claim 1 for reducing bonding steel leakage, it is characterised in that: packet
Include following steps:
(1) raw material is added to water slurrying after mixing, obtains slurry；
(2) slurry is sent to granulation tower and carries out mist projection granulating, then screen out the particle that partial size is 0.15-1mm, sample detection
It studies point, packaging into products.
4. a kind of preparation method of continuous casting covering slag for reducing bonding steel leakage according to claim 3, it is characterised in that: institute
Stating mixing time in step (1) is 60-70min.
5. a kind of preparation method of continuous casting covering slag for reducing bonding steel leakage according to claim 3, it is characterised in that: institute
Stating pulp density in step (1) is 58-65%.
6. a kind of preparation method of continuous casting covering slag for reducing bonding steel leakage according to claim 3, it is characterised in that: institute
Stating mist projection granulating in step (2) is to send the slurry to granulation tower through plunger pump pressurization, and the plunger pump pressure is 0.8-
1.5MPa, defeated slurry speed are 20-25L/min, the aperture 2.0mm of spray gun spray piece, the granulation tower tower temperature when mist projection granulating
It is 650-700 DEG C.
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| CN108145107A (en) * | 2017-06-27 | 2018-06-12 | 贺州市创伟冶金耐材有限公司 | A kind of low viscosity crystallizer protecting residue |
| CN109894588B (en) * | 2019-04-18 | 2021-06-22 | 洛阳市科丰冶金新材料（集团）有限公司 | Special all-endless high-efficiency continuous casting protective slag for ESP (electronic stability program) low-carbon steel and preparation method thereof |
| CN110000352B (en) * | 2019-05-05 | 2021-06-15 | 西峡县西保冶金材料有限公司 | Function protection material for continuous casting crystallizer special for plastic mould steel |
| CN112620599B (en) * | 2020-12-29 | 2022-04-08 | 河南通宇冶材集团有限公司 | Ultralow-alkalinity high-vitrification protective slag for bloom medium-high carbon steel and preparation method thereof |
| CN114045374B (en) * | 2021-11-19 | 2022-11-25 | 西峡龙成冶金材料有限公司 | Special covering slag for nodular cast iron and preparation method and application thereof |
| CN116871472B (en) * | 2023-07-13 | 2024-03-08 | 张家口汇德冶金材料有限公司 | Aluminum-containing middle rolling plate covering slag |
| CN117206481B (en) * | 2023-11-09 | 2024-02-23 | 北京科技大学 | Covering slag for high-pulling-speed continuous casting of high-carbon steel square billets and preparation method and application thereof |
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| CN105328151A (en) * | 2015-12-07 | 2016-02-17 | 河南通宇冶材集团有限公司 | Casting powder for continuous casting crystallizer and preparation method of casting powder |
| CN105642850A (en) * | 2016-03-09 | 2016-06-08 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for ASP medium-carbon steel and a preparation method thereof |
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| CN102773438A (en) * | 2012-07-25 | 2012-11-14 | 洛阳市科丰冶金新材料（集团）有限公司 | Slag powder of continuous casting and rolling sheet billet low-carbon steel crystallizer |
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| CN105328151A (en) * | 2015-12-07 | 2016-02-17 | 河南通宇冶材集团有限公司 | Casting powder for continuous casting crystallizer and preparation method of casting powder |
| CN105642850A (en) * | 2016-03-09 | 2016-06-08 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for ASP medium-carbon steel and a preparation method thereof |
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Denomination of invention: A continuous casting protective slag and its preparation method for reducing bonded steel leakage Granted publication date: 20190426 Pledgee: Industrial and Commercial Bank of China Limited Xixia Branch Pledgor: HENAN TONGYU METALLURGY MATERIALS GROUP Co.,Ltd.|Henan Xuantong New Material Technology Co.,Ltd. Registration number: Y2024980042610 |