CN108213365B - A kind of non-reacted covering slag of high-aluminum steel - Google Patents
A kind of non-reacted covering slag of high-aluminum steel Download PDFInfo
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- CN108213365B CN108213365B CN201810027671.5A CN201810027671A CN108213365B CN 108213365 B CN108213365 B CN 108213365B CN 201810027671 A CN201810027671 A CN 201810027671A CN 108213365 B CN108213365 B CN 108213365B
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- slag
- covering slag
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- 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
Abstract
The invention discloses a kind of non-reacted covering slags of high-aluminum steel, consist of the following components in percentage by weight: CaO 26% ~ 40%, Al2O318% ~ 28%, BaO 14% ~ 28%, Li2O 2% ~ 10%, F‑6% ~ 14%, MgO≤2%, C 2% ~ 8%, remaining is inevitable impurity, and keeps in impurity (Na2O+K2O+SiO2)≤2%.Covering slag of the present invention is substantially free of SiO2、Na2O、Fe2O3、B2O3Deng with the active elements such as [Al], [Ti] react in molten steel component; it protects slag ingredient and performance still stable after use, fundamentally solves a series of problems, such as traditional high-aluminum steel covering slag slag-metal reaction bring covering slag performance deterioration, slag, lobe.The lubrication and heat transfer of covering slag energy effective coordination control slab of the present invention, have stronger absorption Al2O3It is mingled with ability, can guarantees the direct motion of high-aluminum steel continuous casting process.
Description
Technical field
The invention belongs to field of metallurgy, and in particular to a kind of non-reacted covering slag of high-aluminum steel.
Background technique
Traditional covering slag is mainly by CaO and SiO2Composition, while Al is added2O3、MgO、Na2O、F-And Li2The fluxing agents such as O
The characteristics such as viscosity, fusing point and the setting temperature of covering slag are adjusted, the burn-off rate of a certain amount of C adjustment covering slag is in addition incorporated.
In high-aluminum steel casting process because in molten steel aluminium content it is higher, be easy with covering slag in SiO2、Na2O、Fe2O3With
B2O3Etc. component reactions, such as SiO2With reacting for [Al]: 3 (SiO2)+4 [Al]=3 [Si]+2 (Al2O3), so as to cause covering slag
Middle SiO2Equal constituent contents are greatly lowered, Al2O3It is sharply increased, leads to that the performances such as slag melting point, viscosity is protected to significantly change, make
Covering slag performance deteriorate, while cause molten steel increase silicon, nozzle blocking the problems such as.Part high-aluminum steel can wrap in process of setting
Crystalline substance reaction, due to lack of lubrication after covering slag performance deterioration, slab is easily produced since the stress that Phase change shrinkage generates has little time to discharge
The surface quality defects such as raw lobe.
The problems such as recess, lobe are also easy to produce for high-aluminum steel slag liquid reactivity problem and slab in continuous casting process, at present
There are two types of the thinkings that the design of high-aluminum steel covering slag generallys use.
(1) by reducing SiO in covering slag2Content is to reduce slag-metal reaction in crystallizer.Chinese patent
200710042540.6,201210253311.X respectively disclosed in " a kind of continuous casting protection slag for high-alumina steel and its manufacturing method " and
A kind of " high Al2O3In content high-aluminum steel continuous casting covering slag ", by SiO2Content is controlled in reduced levels, can be effectively reduced
SiO2Reacting between [Al], but Na2The higher increase slag risk of O content, and still react with [Al], while can be uneven
Even precipitation Na-Al-O crystal, influences the setting temperature of covering slag, is unfavorable for conducting heat between slab and crystallizer, and
201210253311.X B in patent2O3Content is 2~15%, though SiO can be substituted2Improve covering slag glass form, but still adds
Reactivity between acute steel slag.
(2) low alkalinity is used.Chinese patent CN102233414B, CN201110220295.X are by increasing SiO2Content drop
Minimum living protects basicity of slag, and basicity is increased to expected basicity and realizes that high-aluminum steel is cast after guaranteeing slag-metal reaction, but before slag-metal reaction
Covering slag performance changes greatly afterwards, and cannot absorb the Al for floating up to that slag interface and slag-metal reaction generate in time2O3It is mingled with,
The defects of be easy to causeing casting billet surface and subcutaneous slag inclusion, and such covering slag may be only available for the relatively low steel of [Al] content
Kind.
Summary of the invention
In view of the above shortcomings of the prior art, the object of the present invention is to provide a kind of non-reacted protections of high-aluminum steel
Slag fundamentally contains the reactivity of covering slag and molten steel, guarantees relatively stable, the guarantor of casting process protection slag ingredient and performance
The good greasy property of covering slag and heat-transfer character are demonstrate,proved, to improve casting sequence, reduces surface defect of bloom.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of non-reacted covering slag of high-aluminum steel, consists of the following components in percentage by weight: CaO 26%~40%,
Al2O318%~28%, BaO 14%~28%, Li2O 2%~10%, F-6%~14%, MgO≤2%, C 2%~8%,
Remaining is inevitable impurity, and keeps in impurity (Na2O+K2O+SiO2)≤2%.
Covering slag of the present invention is by CaO, Al2O3、BaO、Li2O, MgO and F-Etc. non-reactive components composition, be free of SiO2、
Na2O、Fe2O3And B2O3Deng easily with the component that the active elements such as [Al], [Ti] react in steel, fundamentally solves the reaction of steel-slag
Property the problem of, guarantee the stabilization for protecting slag ingredient and performance in continuous casting process, improve casting sequence and slab quality.The present invention connects
The physical property for casting covering slag is fusing point: 1050-1140 DEG C, 1300 DEG C of viscositys: and 0.05-0.25PaS, crystallization rate: 90~
100%, it is suitable for the high-aluminum steel of [Al] >=1.5%.
In covering slag of the present invention, CaO is from a wealth of sources as the main component in covering slag, cheap, properly increases
CaO content can obviously reduce the viscosity of covering slag, and enhance the ability for absorbing that oxide is mingled in steel, and do not send out with Al in molten steel
Raw reaction, the present invention control CaO content in 26~40% ranges, can be more preferably 29~33%.
Al2O3It is used as main network topology adult, in the present invention to guarantee that slag has relatively surely in different temperature zones
Fixed structure plays the role of control lubrication and conducts heat, therefore Al of the present invention2O3Content is higher, controls in 18~28% ranges, replaces
For SiO in traditional protection slag2And B2O3Role of the acidic oxide as network topology adult, content can be further preferred
It is 24~27%.
BaO can reduce fusion temperature and viscosity in covering slag, improve covering slag and absorb Al2O3The dynamics item being mingled with
Part improves covering slag absorption and is mingled with ability, while Ba2+Energy and AlO2 -Weak electron pair is formed, covering slag can be also improved and absorb Al2O3
The ability of field trash.BaO replaces part CaO that can improve in covering slag because lacking SiO2And B2O3Acidic oxide and deteriorate
Vitrifying form is conducive to covering slag and lubricates.But when too high levels, since the fusing point of itself is higher, and easily with other ingredients
It in conjunction with generating dystectic Crystalline Phase, therefore is 14~28% by the control of its content in the present invention, can be more preferably 20~
26.5%.
Suitable MgO can reduce the viscosity of covering slag, setting temperature, improve high-aluminum steel lubrication, but the fusing point of MgO itself compared with
Height, and dystectic Crystalline Phase is easily combined into other components, control MgO≤2%.
Li2O is fluxing agent excellent in covering slag, although Na2O also can be used as fluxing agent and cheap, but Na2O can be with
Al reacts in molten steel, and the Na-Al-O crystal being precipitated is unfavorable for the heat transfer of slag film, while Na2O can also reduce slag interface
Tension increases the risk of slag.Therefore, the present invention is by Li2O substitutes Na completely2O is controlled as fluxing agent, content 2~10%
Range can be more preferably 4~8%.
F-It is main fluxing agent in the present invention, can effectively adjusts the viscosity and crystallization mine phase of covering slag, the present invention is by F-Contain
Amount control can be more preferably 7~10% in 6~14% ranges.
C plays skeleton in covering slag, adjusts the burn-off rate of covering slag, and the present invention controls C content 2~
8% range.
Covering slag of the present invention is prepared by the common raw material of industry, and preparation method is as follows:
1) change of raw material of industry lime stone, fluorite, bauxite, barium carbonate, magnesia, lithium carbonate and carbonaceous material is detected respectively
It studies point, weight percent is selected to meet raw material claimed below:
Lime stone: CaO 53-55%, SiO2 < 4%, S < 0.1%；
Fluorite: CaF288-90%, SiO2 < 6.0%, S < 0.05%；
Lithium carbonate: Li2CO3 > 98%；
Bauxite: Al2O3>75%, SiO2<4%；
Barium carbonate: BaCO3 > 95%；
Magnesia: MgO>85%, SiO2<6%, Al2O3<2%；
Carbonaceous material: C > 95%；
2) condition met according to covering slag component composition by weight percent to be prepared, each raw material needed for calculating
Weight.
3) the weighed lime stone of step 2), bauxite, barium carbonate, fluorite, lithium carbonate, magnesia are mixed, is put into mineral hot furnace
In 1350 DEG C~1450 DEG C inside holding 30~40 minutes, make the fusing of each raw material uniformly, natural cooling of then coming out of the stove or drying,
Obtain pre- melt.
4) pre- melt is crushed and is worked into 200 mesh hereinafter, the desired amount of carbonaceous material is added, be then added in refiner
The normal-temperature water that 0.8~1.2 times of siccative weight, the cellulose binder of siccative weight 1.6~2% are refined 30~60 minutes, are made
Slurry.
5) obtained slurry is sent into drying and granulating in spraying granule drying tower, product requirement moisture is less than 0.5%, granularity
In 0.01~2mm range, sealing pack is stand-by.
Compared with prior art, the invention has the following beneficial effects:
1, relative to hypoergia covering slag and traditional slag system, covering slag of the present invention does not contain anti-with Al, Ti in high-aluminum steel
The component SiO answered2(while not containing reactive component Na2O、Fe2O3、B2O3Deng), it is a new non-reacted covering slag system,
SiO2The effect of the Network former served as in covering slag is by Al2O3Replace.Ingredient and performance are stablized before and after covering slag use,
Fundamentally solves a series of problems, such as deterioration of slag-metal reaction bring covering slag performance, slag, lobe.
2, contain the Al of high level in covering slag2O3(18~28%) are that the major networks structure of slag forms body, protect
The stabilization of slag structure in use is demonstrate,proved, the control conducive to covering slag to lubrication and heat transfer.
3, the present invention BaO (14~28%) containing high level, BaO can reduce the fusion temperature and viscosity of covering slag,
While and Li2O and F-Synergistic effect can be effectively controlled the lubrication of slab, heat transfer.Because of Ba2+Compared to Ca2+Electrostatic potential is smaller,
The weak AlO of electrostatic potential in slag2 -More clustering is understood in Ba2+Around, form weak ion pair, therefore in slag BaO increase, make
Covering slag of the present invention has stronger absorption Al2O3It is mingled with ability, conducive to the slab for producing great surface quality.
4, covering slag of the present invention is substantially free of Na2O、Fe2O3、B2O3Etc. components.It can deteriorate first to avoid slag-metal reaction
Covering slag performance；Secondly because these components can all reduce the surface tension of covering slag, after removal, the wind of slag can reduce
Danger；Finally, the heat transfer of slag film can be unfavorable for avoid precipitation Na-Al-O crystal.Its effect can be by Li2The components such as O substitution.
5, covering slag of the present invention is free of SiO2、B2O3Etc. strong vitrifying, highly acid component, the strong basicity containing high level
BaO and amphoteric oxide Al2O3, crystallization rate > 90%, suitable for the very strong high-aluminum steel steel grade of crack sensitivity.
Specific embodiment
Invention is further described in detail combined with specific embodiments below, wherein (Na in the impurity of each embodiment2O+
K2O+SiO2)≤2%.
Embodiment 1
The present embodiment covering slag is made of the chemical component of following weight percent: CaO 30.4%, Al2O321.3%,
BaO26.2%, Li2O 4.1%, F-7.1%, MgO 1.2%, C 7.0%, remaining is inevitable impurity, and in impurity
(Na2O+K2O+SiO2)≤2%.
The present embodiment covering slag is prepared by the common raw material of industry, and preparation method is as follows:
1) change of raw material of industry lime stone, fluorite, bauxite, barium carbonate, magnesia, lithium carbonate and carbonaceous material is detected respectively
It studies point, weight percent is selected to meet raw material claimed below.
Lime stone: CaO 53-55%, SiO2< 4%, S < 0.1%；
Fluorite: CaF288-90%, SiO2< 6.0%, S < 0.05%；
Lithium carbonate: Li2CO3> 98%；
Bauxite: Al2O3> 75%, SiO2< 4%；
Barium carbonate: BaCO3> 95%；
Magnesia: MgO > 85%, SiO2< 6%, Al2O3< 2%；
Carbonaceous material: C > 95%；
2) condition met according to 1 elemental composition weight percent of embodiment, the weight of each raw material needed for calculating are as follows: stone
Lime stone 25.9%, bauxite 21%, barium carbonate 27.2%, fluorite 11.8%, lithium carbonate 7.6%, magnesia 1.0%, carbonaceous material
5.4%.
3) the weighed lime stone of step 2), bauxite, barium carbonate, fluorite, lithium carbonate, magnesia are mixed, is put into mineral hot furnace
In 1350 DEG C~1450 DEG C inside holding 30~40 minutes, make the fusing of each raw material uniformly, natural cooling of then coming out of the stove or drying,
Obtain pre- melt.
4) pre- melt is crushed and is worked into 200 mesh hereinafter, the desired amount of carbonaceous material is added, be then added in refiner
The normal-temperature water that 0.8~1.2 times of siccative weight, the cellulose binder of siccative weight 1.6~2% are refined 30~60 minutes, are made
Slurry.
5) obtained slurry is sent into drying and granulating in spraying granule drying tower, product requirement moisture is less than 0.5%, granularity
In 0.01~2mm range, sealing pack is stand-by.
Embodiment 2~4
The component of covering slag is as shown in table 1 in embodiment 2~4, and the preparation method is the same as that of Example 1, the weight of each embodiment raw material
It is as shown in table 2 to measure percentage proportion.
Table 1 lists the covering slag chemical component weight percentage and corresponding important physical properties of Examples 1 to 4.
Table 2 lists the proportion of each raw material weight percentage of covering slag of Examples 1 to 4.
The chemical component (wt%) and its physical property of 1 Examples 1 to 4 covering slag of table
2 each raw material proportioning of Examples 1 to 4 covering slag (wt%) of table
Covering slag in Examples 1 to 4 is subjected to steel slag experiment, covering slag after experiment in the induction furnace of 5 kilograms of laboratory
Ingredient and performance are as shown in table 3, wherein experiment steel slag weight ratio is 10:1, in molten steel [Al]=2%, experimental temperature control exists
1500~1550 DEG C.It is melt cinder because testing finally collect, is free of C, does not include that C in initial slag contains in composition test result
Amount.
Al after testing as shown in Table 3 in slag2O3Amplification is 2~4%, and increment reason is mainly Al in steel2O3It is mingled with
Caused by being absorbed after floating slag interface by covering slag, covering slag absorption, which is mingled with, to be had excellent performance.Remaining component content is then kept not substantially
Become, meet the characteristic of non-reaction slag, fusing point and viscosity elevation amplitude are smaller, and performance is stablized, and meet high-aluminum steel continuous casting requirement.
Chemical component (wt%) and physical property after 3 Examples 1 to 4 covering slag induction furnace slag-metal reaction of table
Covering slag in Examples 1 to 4 is used for [Al] content as the production of 1.5~3.5% sheet billet continuous castings, the results showed that,
In order, casting process is smooth for mold liquid level, and for the original qualification rate of slab 98% or more, surface quality is good.
The above embodiment of the present invention is only example to illustrate the invention, and is not to implementation of the invention
The restriction of mode.For those of ordinary skill in the art, other can also be made not on the basis of the above description
With the variation and variation of form.Here all embodiments can not be exhaustive.It is all to belong to technical solution of the present invention
Changes and variations that derived from are still in the scope of protection of the present invention.
Claims (3)
1. a kind of non-reacted covering slag of high-aluminum steel, which is characterized in that consist of the following components in percentage by weight: CaO
26% ~ 40%, Al2O318% ~ 28%, BaO 14% ~ 28%, Li2O 2% ~ 10%, F-6% ~ 14%, MgO≤2%, C 2% ~ 8%, remaining is
Inevitable impurity, and (Na is kept in impurity2O+K2O+SiO2)≤2%；High-aluminum steel suitable for [Al] >=1.5%.
2. a kind of non-reacted covering slag of high-aluminum steel according to claim 1, which is characterized in that by following weight percent
The group of ratio is grouped as: CaO 26% ~ 40%, Al2O318% ~ 27%, BaO 20.5% ~ 28%, Li2O 4% ~ 8%, F-6% ~ 11%, MgO
≤ 1.5%, C 2% ~ 8%, remaining is inevitable impurity, and keeps in impurity (Na2O+K2O+SiO2)≤2%.
3. a kind of non-reacted covering slag of high-aluminum steel according to claim 1, which is characterized in that covering slag it is physical
1050 ~ 1140 DEG C of fusing point, 1300 DEG C of 0.05 ~ 0.25 PaS of viscosity are able to satisfy, crystallization rate 90 ~ 100%.
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| CN111590039A (en) * | 2020-05-29 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting covering slag for low-carbon high-aluminum steel and preparation method thereof |
| CN111570740A (en) * | 2020-05-29 | 2020-08-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting covering slag for high-aluminum steel and preparation method thereof |
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| CN113953472B (en) * | 2021-11-02 | 2023-02-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting covering slag for high titanium steel and preparation method thereof |
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