CN100584487C - Preparation Preliminary melting type continuous casting crystallizer protecting slag - Google Patents
Preparation Preliminary melting type continuous casting crystallizer protecting slag Download PDFInfo
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- CN100584487C CN100584487C CN200810049028A CN200810049028A CN100584487C CN 100584487 C CN100584487 C CN 100584487C CN 200810049028 A CN200810049028 A CN 200810049028A CN 200810049028 A CN200810049028 A CN 200810049028A CN 100584487 C CN100584487 C CN 100584487C
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Abstract
The invention belongs to the field of auxiliary materials for smelting steel, in particular to a covering slag for a pre-melting continuous casting crystallizer. The weight percentage components of the covering slag are as follows: 31 to 36 percent of SiO2, 30 to 35 percent of CaO, 2 to 5 percent of MgO, not more than 1.5 percent of Fe2O3, 2 to 5 percent of Al2O3, 8 to 11 percent of Na2O, 5 to 8 percent of F, 0.8 to 1.5 percent of Li2O, 3 to 6 percent of C and the rest are unavoidable impurities. The covering slag has a good liquidity and spreadability, can uniformly cover the surface of molten steel, has no piling phenomenon, and has the advantages of active slag surface, uniform melting and no caking phenomenon. The invention has a better insulating performance and has no cold steel agglomerated on the liquid surface; can ensure a casting blank to be fully lubricated so as to realize a high pulling rate; has a stable performance after absorbing the impurities and can realize stable and smooth continuous manufacture; avoids the steel leakage phenomenon, improves the casting blank quality and can lead the longitudinal crack of a plate blank and the angle part cross crack to be reduced by more than two third averagely; the invention has a low cost and is convenient for popularizing.
Description
(1) technical field
The invention belongs to steel-making auxilliary material field, particularly a kind of preparation method of preliminary melting type continuous casting crystallizer protecting slag.
(2) background technology
Continuous crystallizer protecting slag is the important materials during continuous casting is produced, and is the necessary means of producing the zero defect strand.Continuous casting covering slag has five functional in crystallizer: secluding air prevents secondary oxidation of steel; Adiabatic heat-insulation prevents the molten steel surface partial condensation; The purify hot metal interface absorbs the field trash that floats in the steel; Lubricated casting billet surface reduces resistance of billet withdrawal; Improve the solidification and heat transfer between strand and crystallizer.The performance of continuous casting covering slag directly has influence on the lumber recovery of slab surface quality and internal soundness and even steel.
High pulling rate (the sheet slab pulling rate is more than 1.2m/min) continuous casting technology is the necessary condition that assurance steel-making-steel rolling continuous processing line can be kept balance, logistics capacity balance.But along with the increase of poring rate, continuous casting is faced with problems such as bleed-out and slab quality deterioration.Cause the reason of bleed-out to mainly contain: the continuous casting covering slag relative consumption reduces under the 1. high pulling rate, make the thickness and the uniformity of lubricated slag film can not get guaranteeing, cause bonding phenomenon reinforcement in the crystallizer, frictional resistance increases, and causes the tensile stress in the nascent solidified shell to increase; 2. copper plate of crystallizer increase in temperature, the scull attenuate; When 3. strand went out the crystallizer end opening, the thin easy bulge of base shell, strand were supported by face and change the line support suddenly into.Cause the reason that slab quality worsens to have: 1. because casting speed is higher, the molten steel amount that unit interval injects in the crystallizer is big, and crystallizer is little to the cushioning effect of high-speed steel stream because volume is little, make liquid fluctuating aggravation in the crystallizer, be involved in slag easily and be mingled with; Meniscus fluctuation aggravation often causes strand crackle, pit, is mingled with, defective such as pore, makes simultaneously that molten slag layer is difficult to keep on the crystallizer molten steel surface; 2. near plate slab crystallizer wall temperature field skewness (especially the mouth of a river) everywhere in casting process washing away strongly down of stream strand, makes thickness of solidified slab shell in secondary inhomogeneous, easily causes the crackle of strand.
And high casting speed continuous casting is produced wide plate base steel plate, because the flakiness ratio of sheet billet continuous casting is bigger, the contact area of ton steel molten steel and crystallizer wall is big, the molten steel radiating rate is faster than the strand of other type section, therefore solidification of molten steel speed is fast, the mold liquid level temperature is low, causes the melting condition of covering slag bad, easily causes casting billet surface and defectives such as subcutaneous slag inclusion and elephant skin; Strand has bigger tensile stress along the broadside horizontal direction in process of setting in addition, and this tensile stress also is to cause the one of the main reasons of slab lobe, and along with the increase of width of plate slab, the lobe occurrence rate is in rising trend.
Have above problems because high casting speed continuous casting is produced the wide plate base, the performance of covering slag has been proposed higher requirement, some import covering slag can solve above subproblem at present, but import covering slag expense height is unsuitable for promoting on a large scale.
(3) summary of the invention
The object of the present invention is to provide a kind of preparation method of preliminary melting type continuous casting crystallizer protecting slag, produce the needs of wide plate base steel plate, reduce the bleed-out phenomenon, improve slab quality to adapt to present high casting speed continuous casting.
The technical solution used in the present invention is as follows:
A kind of preliminary melting type continuous casting crystallizer protecting slag, the weight percent of described covering slag is composed as follows: SiO
231-36%, CaO30-35%, MgO2-5%, Fe
2O
3Be not more than 1.5%, Al
2O
32-5%, Na
2O 8-11%, F 5-8%, Li
2O 0.8-1.5%, C 3-6%, surplus is a unavoidable impurities.
Preferably, the weight percent of described covering slag is composed as follows: SiO
233-35%, CaO32-34%, MgO3-4%, Fe
2O
3Be not more than 0.8%, Al
2O
33-4%, Na
2O 8-10%, F 6-7.5%, Li
2O 1.1-1.4%, C 4-5.5%, surplus is a unavoidable impurities.
The composition of described continuous crystallizer protecting slag is according to CaO-SiO
2-Al
2O
3Wollastonite zone in the ternary system selects each to become to be grouped into, and CaO is as main basic matterial, SiO in the component that constitutes covering slag
2As main acid material, Na
2O, CaF
2, Li
2O is as main flux, and carbonaceous components is as framework material and molten speed control preparation.Organic assembling by base-material and flux; adjust the chemical analysis of covering slag; be mingled with physical and chemical indexs such as ability, heat-transfer capability with fusion temperature, viscosity, crystal property, the absorption of regulating covering slag; satisfy the needs that under high pulling rate state, can keep normal slag consumption and liquid slag layer thickness and reasonable heat output; thereby guaranteed the shell thickness of the crystallizer port of export, realized not having the production of bonding continuous casting.
Further, adjusting described covering slag, to have following physicochemical property: basicity R be 0.90～0.95, and fusion temperature is 1030 ± 30 ℃, and 1300 ℃ of viscosity are 1.10～1.30PaS.
In basicity R was 0.90～0.95 scope, the crystallization rate was zero, and promptly molten mold flux can be realized 100% vitrifying rate, and molten mold flux liquid has the excellent lubrication function.
Make covering slag between crystallizer and the strand have the solid phase of higher rate by the fusion temperature that improves covering slag, thereby the heat radiation of cast peritectoid carbon steel crystallizer is more even, reaches the purpose of even slow cooling.
Covering slag has suitable viscosity, makes liquid slag can flow into slit between crystallizer and strand equably, forms uniform slag film, make conduct heat in the crystallizer evenly, hot-fluid is stable, initial solidification shell thickness is even, prevents the generation of crackle.
Therefore described covering slag can reduce the generation of strand longitudinal crack, improves slab quality.
Preferably; described covering slag is made by following materials of weight proportions: melting charge 75～80%, lithium carbonate 2.0～4.5%, sodium carbonate 4～7%, sodium fluoride 3～5%, fluorite 4～7%, semi-reinforcing carbon black 2～4%, flaky graphite 3～5%, the weight percent of described melting charge consists of SiO
242-45%, CaO36-39%, MgO4-6%, Fe
2O
3Be not more than 1%, Al
2O
33-5%, Na
2O3-5%, F3-5%.
Type, mass fraction, the particle diameter of covering slag burn-off rate and carbonaceous material and to join the carbon mode all be relevant.Along with the mass fraction increase of carbonaceous material in the covering slag, burn-off rate reduces gradually.Under low quality was divided said conditions, granularity was less, decentralization is big, ignition point is lower, surface free energy is higher, the active carbon of impalpable structure and carbon black have the good isolation effect; Under high-quality divided said conditions, granularity was big, decentralization is less, ignition point is higher, surface free energy is lower, the graphite of laminated structure has good skeleton function.Therefore the control range of determining carbon content in the covering slag is 3.0～6.0%, and raw material sources are made up of the flaky graphite of the semi-reinforcing carbon black that accounts for raw material gross weight 2～4% and 3～5%.
Raw material granularity should be as far as possible little in addition, is difficult for causing fractional melting; Preferred each raw material granularity is not more than 300 orders.
It is to melt inhomogeneity consideration for covering slag that raw material adopts melting charge.The covering slag of fusing lack of homogeneity is added to crystallizer molten steel surface; meltable composition at first melts and runs off; the residual fraction of infusibility becomes sinter; so just, may around copper plate of crystallizer, form very thick skull gradually; solid sintering particle or lump also often appear on the top of the slag; these not molten sinters are easy to be involved in the base shell and cause dreg defect near meniscus; inhomogeneous fusing simultaneously also influences the even injection of slag between crystallizer and base shell; the uneven covering slag of this fusing often causes liquid slag layer to depart from original chemical analysis; the various performance indications of covering slag are changed, influence its result of use.In addition in casting process; temperature field on the crystallizer molten steel surface is unsettled; molten steel face each point temperature bear the position and the time constantly changes; the thermograde that acts on protection slag blanket each point is also along with position and time change, and this is that raising along with thermograde reduces gradually with regard to the programming rate that causes protection slag blanket each point.Therefore control the uniformity of covering slag fusing and must control the stability that covering slag hemisphere point temperature changes programming rate.And the covering slag of pre-melt preparation has the performance of stable homogeneous on the one hand, and next temperature that shows when having only the covering slag of pre-melt preparation to melt in crystallizer is consistent with the fusion temperature that the fusing back has on the molten steel face.So it must be that melting charge is as base-material with pre-melt material that high casting speed continuous casting wide plate base uses covering slag.
Covering slag of the present invention is used for 1.7～1.9m/min during the section of pulling rate cast 220mm * 1500mm of high 2.0m/min, and the average consumption of covering slag is at 0.42～0.48kg/ ton steel; Suitable slag consumption can reduce the strand lobe.
The present invention also provides a kind of preparation method of preliminary melting type continuous casting crystallizer protecting slag as mentioned above; raw material is crushed to granularity is not more than 300 orders; fully mix then, the water mill pulping; promptly get described covering slag after the 580-630 ℃ of spray-drying, described raw material and weight proportion thereof are melting charge 75～80%, lithium carbonate 2.0～4.5%, sodium carbonate 4～7%, sodium fluoride 3～5%, fluorite 4～7%, semi-reinforcing carbon black 2～4%, flaky graphite 3～5%.
Wherein, mix with water mill slurrying and preferably respectively carry out twice in proper order, the each mixing with the water mill slurrying time respectively is controlled at 1-2h.Further water mill slurrying concentration is 50-58% again; Add the binding agent of raw material quality 1.8～3.0% when each raw water grinds slurry, described binding agent can be selected sodium carboxymethylcellulose.
In the water mill pulping process, 50%～65% covering slag siccative is mix grinding in homogenizer with water and binding agent, and each component raw material, particularly carbonaceous material obtain abundant mixing and dispersion and form flowability slip preferably.
The present invention has following advantage with respect to prior art:
Continuous casting covering slag of the present invention is good in crystallizer internal mobility and spreadability, can evenly cover the molten steel face, does not have the heap phenomenon and exists; Can observe uniform flare on the molten steel face, the top of the slag is active, and fusing is even, and the top of the slag does not have clustering phenomena.Heat-insulating property is better, and when cast temperature was low, liquid level did not have the cold steel phenomenon of knot.Can guarantee that strand obtains sufficient lubrication to realize high pulling rate; Stable performance behind the absorption field trash can realize the stable smooth operation that continuous casting is produced.Avoided the bleed-out phenomenon, improved slab quality, on average can make slab lobe and transverse corner crack reduce more than 2/3; Cost is low, is convenient to promote.
(4) specific embodiment:
Below with specific embodiment technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
Embodiment 1
Covering slag is composed as follows:
SiO
234%, CaO 32.5%, MgO 4.1%, Fe
2O
30.8%, Al
2O
33.5%, Na
2O 9.3%, F 6.8%, Li
2O 1.3%, C 5%, surplus is an impurity.
Per 100 parts of raw materials are got 77 parts of melting charges, 3.0 parts of lithium carbonates, 5.0 parts in sodium carbonate, 4.0 parts of sodium fluorides, 5.0 parts in fluorite, 2.5 parts of semi-reinforcing carbon blacks, 3.5 parts of flaky graphites; Above each raw material pulverizing to granularity is not more than 300 orders, fully mixes 1h then, the sodium carboxymethylcellulose that adds raw material quality 2.5% is a binding agent, and it is 55% slurry that water mill 2h obtains concentration, promptly gets described covering slag after 600 ℃ of spray-dryings.
Embodiment 2
Covering slag is composed as follows:
SiO
234.8%, CaO 33.7%, MgO 4.3%, Fe
2O
30.7%, Al
2O
33.7%, Na
2O 9.7%, F 6.1%, Li
2O 1.0%, C 5.2%, surplus is an impurity.
Per 100 parts of raw materials are got 79 parts of melting charges, 2.5 parts of lithium carbonates, 4.0 parts in sodium carbonate, 3.5 parts of sodium fluorides, 4.8 parts in fluorite, 2.4 parts of semi-reinforcing carbon blacks, 3.8 parts of flaky graphites; Above each raw material pulverizing to granularity is not more than 300 orders, fully mixes 1h then, the sodium carboxymethylcellulose that adds raw material quality 2.2% is a binding agent, and water mill 2h obtains concentration and be 58% slurry, promptly gets described covering slag after 630 ℃ of spray-dryings.
Embodiment 3
Covering slag is composed as follows:
SiO
232.7%, CaO 32.0%, MgO 4.0%, Fe
2O
30.47%, Al
2O
34.1%, Na
2O 10.3%, F 7.1%, Li
2O 1.5%, C 5.3%, surplus is an impurity.
Per 100 parts of raw materials are got 76 parts of melting charges, 3.8 parts of lithium carbonates, 4.8 parts in sodium carbonate, 4.3 parts of sodium fluorides, 5.3 parts in fluorite, 2.8 parts of semi-reinforcing carbon blacks, 3.0 parts of flaky graphites; Above each raw material pulverizing to granularity is not more than 300 orders, fully mixes 1h then, the sodium carboxymethylcellulose that adds raw material quality 3% is a binding agent, and water mill 2h obtains concentration and be 56% slurry, promptly gets described covering slag after 600 ℃ of spray-dryings.
Claims (1)
1. method for preparing preliminary melting type continuous casting crystallizer protecting slag, it is characterized in that described method is: raw material is crushed to granularity is not more than 300 orders, fully mix then, the water mill pulping, promptly get described covering slag after 580 ℃～630 ℃ spray-dryings, wherein, mix with water mill slurrying and respectively carry out twice in proper order, the each mixing with the water mill slurrying time respectively is controlled at 1-2h; Water mill slurrying concentration is 50-58%; Add the binding agent of raw material quality 1.8～3.0% when each raw water grinds slurry, described binding agent can be selected sodium carboxymethylcellulose; Described raw material and weight proportion thereof are melting charge 75～80%, lithium carbonate 2.0～4.5%, sodium carbonate 4～7%, sodium fluoride 3～5%, fluorite 4～7%, semi-reinforcing carbon black 2～4%, flaky graphite 3～5%, and the weight percent of described melting charge consists of: SiO
242-45%, CaO 36-39%, MgO 4-6%, Fe
2O
3Be not more than 1%, Al
2O
33-5%, Na
2O 3-5%, F 3-5%; The weight percent of described covering slag is composed as follows: SiO
233-35%, CaO32-34%, MgO3-4%, Fe
2O
3Be not more than 0.8%, Al
2O
33-4%, Na
2O8-10%, F 6-7.5%, Li
2O1.1-1.4%, C4-5.5%, surplus is a unavoidable impurities; Described covering slag basicity R is 0.90～0.95, and fusion temperature is 1030 ± 30 ℃, and 1300 ℃ of viscosity are 1.10～1.30PaS.
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| CN102009141B (en) * | 2010-08-09 | 2012-11-21 | 河南省西保冶材集团有限公司 | Function protection material for medium and low carbon tool and die steel special continuous casting crystallizer |
| CN102078949A (en) * | 2011-01-28 | 2011-06-01 | 东北大学 | Continuous casting mold powder for ferrite stainless steel and preparation method thereof |
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| CN103551537B (en) * | 2013-11-05 | 2016-06-29 | 北京首钢股份有限公司 | Ultra-low-carbon steel, low carbon steel crystallizer protective slag and preparation method thereof |
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